| Message ID | 20180413074604.3286-1-joel@jms.id.au (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
Joel Stanley <joel@jms.id.au> writes: > This driver is for the ASPEED BMC SoC's GFX display hardware. This > driver runs on the ARM based BMC systems, unlike the ast driver which > runs on a host CPU and is is for a PCIe graphics device that happens to > live in the BMC's silicon, but is otherwise available for use by the BMC. > > The AST2500 supports a total of 3 output paths: > > 1. VGA output (aka host PCIe graphics device), the output target can > choose either or both to the DAC or DVO interface. > > 2. Graphics CRT output, the output target can choose either or both to > the DAC or DVO interface. > > 3. Video input from DVO, the video input can be used for video engine > capture or DAC display output. > > Output options for are selected in SCU2C. This must be toggled by the > BMC in order to select between the host and BMC's display output. > > The "VGA mode" device is the PCI attached controller. The "Graphics CRT" > is the BMC's internal display controller. > > This driver only supports a simple configuration consisting of a 40MHz > pixel clock (fixed by hardware limitations) and the VGA output path. The confusing part of this driver to me is understanding where this display output is going -- if you're going out a VGA connector to a monitor (is that what "DAC" meant?), we ought to have DRM_MODE_CONNECTOR_VGA and a .get_modes that does I2C to get the EDID. If it's fed into the input of some other display controller, then I'm not sure what's the right thing to do. I'd recommend moving some of this commit message into kerneldoc in the _drv.c explaining what the HW does and what parts of the HW the driver exposes. > Signed-off-by: Joel Stanley <joel@jms.id.au> > --- > > Hello! > > This driver is working on hardware, with a few oddities. The things that > I know need cleaning up are: > > - clocks: The device can source a clock from three different sources, > but they depend on the configuration of other devices in the system > (the USB PHY and the 'host' display controller). For this reason we > limit the driver to the 40MHz pixel clock that comes from the USB > PHY. You may want to look into setting up a little mux clock provider that can source from whatever parents are available to get you the best, faster-than-requested clock. Then, if the rate it gives you is too far off from what you wanted, maybe stretch the hblank intervals of your modeline to get as close to the target vrefresh as possible (check out vc4_dsi.c:vc4_dsi_encoder_mode_fixup() for an example of doing this) > - Setting an initial mode. I can only get the system to output when > running X. fbset and fb-test can't seem to do this on their own. The > system this is being developed for intends to run a simple fbterm > based application, so this needs fixing. Not sure what would be going on here. You do have all of the DRM FB emulation bits enabled, right? > I wanted to get feedback on the way the driver is structured, and if > possible a some advice on why fb tools can't set a mode themselves. drm_simple_display_pipe seems like a good way to get started. Eventually to merge you'll need a DT binding document (Documentation/devicetree/bindings/display) > diff --git a/drivers/gpu/drm/aspeed/aspeed_gfx.h b/drivers/gpu/drm/aspeed/aspeed_gfx.h > new file mode 100644 > index 000000000000..fb56e425bd48 > --- /dev/null > +++ b/drivers/gpu/drm/aspeed/aspeed_gfx.h > @@ -0,0 +1,104 @@ > +// SPDX-License-Identifier: GPL-2.0+ > +// Copyright 2018 IBM Corporation > + > +#include <drm/drmP.h> > +#include <drm/drm_simple_kms_helper.h> > + > +struct aspeed_gfx { > + void __iomem *base; > + struct clk *clk; > + struct reset_control *rst; > + struct regmap *scu; > + > + struct drm_simple_display_pipe pipe; > + struct drm_connector connector; > + struct drm_fbdev_cma *fbdev; > +}; > + > +int aspeed_gfx_create_pipe(struct drm_device *drm); > +int aspeed_gfx_create_output(struct drm_device *drm); > + > +#define CRT_CTRL1 0x60 /* CRT Control I */ > +#define CRT_CTRL2 0x64 /* CRT Control II */ > +#define CRT_STATUS 0x68 /* CRT Status */ > +#define CRT_MISC 0x6c /* CRT Misc Setting */ > +#define CRT_HORIZ0 0x70 /* CRT Horizontal Total & Display Enable End */ > +#define CRT_HORIZ1 0x74 /* CRT Horizontal Retrace Start & End */ > +#define CRT_VERT0 0x78 /* CRT Vertical Total & Display Enable End */ > +#define CRT_VERT1 0x7C /* CRT Vertical Retrace Start & End */ > +#define CRT_ADDR 0x80 /* CRT Display Starting Address */ > +#define CRT_OFFSET 0x84 /* CRT Display Offset & Terminal Count */ > +#define CRT_THROD 0x88 /* CRT Threshold */ > +#define CRT_XSCALE 0x8C /* CRT Scaling-Up Factor */ > +#define CRT_CURSOR0 0x90 /* CRT Hardware Cursor X & Y Offset */ > +#define CRT_CURSOR1 0x94 /* CRT Hardware Cursor X & Y Position */ > +#define CRT_CURSOR2 0x98 /* CRT Hardware Cursor Pattern Address */ > +#define CRT_9C 0x9C > +#define CRT_OSD_H 0xA0 /* CRT OSD Horizontal Start/End */ > +#define CRT_OSD_V 0xA4 /* CRT OSD Vertical Start/End */ > +#define CRT_OSD_ADDR 0xA8 /* CRT OSD Pattern Address */ > +#define CRT_OSD_DISP 0xAC /* CRT OSD Offset */ > +#define CRT_OSD_THRESH 0xB0 /* CRT OSD Threshold & Alpha */ > +#define CRT_B4 0xB4 > +#define CRT_STS_V 0xB8 /* CRT Status V */ > +#define CRT_SCRATCH 0xBC /* Scratchpad */ > +#define CRT_BB0_ADDR 0xD0 /* CRT Display BB0 Starting Address */ > +#define CRT_BB1_ADDR 0xD4 /* CRT Display BB1 Starting Address */ > +#define CRT_BB_COUNT 0xD8 /* CRT Display BB Terminal Count */ > +#define OSD_COLOR1 0xE0 /* OSD Color Palette Index 1 & 0 */ > +#define OSD_COLOR2 0xE4 /* OSD Color Palette Index 3 & 2 */ > +#define OSD_COLOR3 0xE8 /* OSD Color Palette Index 5 & 4 */ > +#define OSD_COLOR4 0xEC /* OSD Color Palette Index 7 & 6 */ > +#define OSD_COLOR5 0xF0 /* OSD Color Palette Index 9 & 8 */ > +#define OSD_COLOR6 0xF4 /* OSD Color Palette Index 11 & 10 */ > +#define OSD_COLOR7 0xF8 /* OSD Color Palette Index 13 & 12 */ > +#define OSD_COLOR8 0xFC /* OSD Color Palette Index 15 & 14 */ > + > +/* CTRL1 */ > +#define CRT_CTRL_EN BIT(0) > +#define CRT_CTRL_HW_CURSOR_EN BIT(1) > +#define CRT_CTRL_OSD_EN BIT(2) > +#define CRT_CTRL_INTERLACED BIT(3) > +#define CRT_CTRL_COLOR_RGB565 (0 << 7) > +#define CRT_CTRL_COLOR_YUV444 (1 << 7) > +#define CRT_CTRL_COLOR_XRGB8888 (2 << 7) > +#define CRT_CTRL_COLOR_RGB888 (3 << 7) > +#define CRT_CTRL_COLOR_YUV444_2RGB (5 << 7) > +#define CRT_CTRL_COLOR_YUV422 (7 << 7) > +#define CRT_CTRL_COLOR_MASK GENMASK(9, 7) > +#define CRT_CTRL_HSYNC_NEGATIVE BIT(16) > +#define CRT_CTRL_VSYNC_NEGATIVE BIT(17) > +#define CRT_CTRL_VERTICAL_INTR_EN BIT(30) > +#define CRT_CTRL_VERTICAL_INTR_STS BIT(31) > + > +/* CTRL2 */ > +#define CRT_CTRL_DAC_EN BIT(0) > +#define CRT_CTRL_VBLANK_LINE(x) (((x) << 20) & CRT_CTRL_VBLANK_LINE_MASK) > +#define CRT_CTRL_VBLANK_LINE_MASK GENMASK(20, 31) > + > +/* CRT_HORIZ0 */ > +#define CRT_H_TOTAL(x) (x) > +#define CRT_H_DE(x) ((x) << 16) > + > +/* CRT_HORIZ1 */ > +#define CRT_H_RS_START(x) (x) > +#define CRT_H_RS_END(x) ((x) << 16) > + > +/* CRT_VIRT0 */ > +#define CRT_V_TOTAL(x) (x) > +#define CRT_V_DE(x) ((x) << 16) > + > +/* CRT_VIRT1 */ > +#define CRT_V_RS_START(x) (x) > +#define CRT_V_RS_END(x) ((x) << 16) > + > +/* CRT_OFFSET */ > +#define CRT_DISP_OFFSET(x) (x) > +#define CRT_TERM_COUNT(x) ((x) << 16) > + > +/* CRT_THROD */ > +#define CRT_THROD_LOW(x) (x) > +#define CRT_THROD_HIGH(x) ((x) << 8) > + > +/* Default Threshold Seting */ > +#define G5_CRT_THROD_VAL (CRT_THROD_LOW(0x24) | CRT_THROD_HIGH(0x3C)) > diff --git a/drivers/gpu/drm/aspeed/aspeed_gfx_crtc.c b/drivers/gpu/drm/aspeed/aspeed_gfx_crtc.c > new file mode 100644 > index 000000000000..849688635ff3 > --- /dev/null > +++ b/drivers/gpu/drm/aspeed/aspeed_gfx_crtc.c > @@ -0,0 +1,215 @@ > +// SPDX-License-Identifier: GPL-2.0+ > +// Copyright 2018 IBM Corporation > + > +#include <linux/clk.h> > +#include <linux/reset.h> > +#include <linux/regmap.h> > + > +#include <drm/drm_crtc_helper.h> > +#include <drm/drm_device.h> > +#include <drm/drm_fb_cma_helper.h> > +#include <drm/drm_gem_cma_helper.h> > +#include <drm/drm_simple_kms_helper.h> > +#include <drm/drm_gem_framebuffer_helper.h> > +#include <drm/drm_panel.h> > + > +#include "aspeed_gfx.h" > + > +static struct aspeed_gfx * > +drm_pipe_to_aspeed_gfx(struct drm_simple_display_pipe *pipe) > +{ > + return container_of(pipe, struct aspeed_gfx, pipe); > +} > + > +static int aspeed_gfx_set_pixel_fmt(struct aspeed_gfx *priv, u32 *bpp) > +{ > + struct drm_crtc *crtc = &priv->pipe.crtc; > + struct drm_device *drm = crtc->dev; > + const u32 format = crtc->primary->state->fb->format->format; > + u32 ctrl1; > + > + ctrl1 = readl(priv->base + CRT_CTRL1); > + ctrl1 &= ~CRT_CTRL_COLOR_MASK; > + > + switch (format) { > + case DRM_FORMAT_RGB565: > + dev_dbg(drm->dev, "Setting up RGB565 mode\n"); > + ctrl1 |= CRT_CTRL_COLOR_RGB565; > + *bpp = 16; > + break; > + case DRM_FORMAT_XRGB8888: > + dev_dbg(drm->dev, "Setting up XRGB8888 mode\n"); > + ctrl1 |= CRT_CTRL_COLOR_XRGB8888; > + *bpp = 32; > + break; > + default: > + dev_err(drm->dev, "Unhandled pixel format %08x\n", format); > + return -EINVAL; > + } > + > + writel(ctrl1, priv->base + CRT_CTRL1); > + > + return 0; > +} > + > +static void aspeed_gfx_enable_controller(struct aspeed_gfx *priv) > +{ > + u32 ctrl1 = readl(priv->base + CRT_CTRL1); > + u32 ctrl2 = readl(priv->base + CRT_CTRL2); > + > + /* SCU2C: set DAC source for display output to Graphics CRT (GFX) */ > + regmap_update_bits(priv->scu, 0x2c, BIT(16), BIT(16)); > + > + writel(ctrl1 | CRT_CTRL_EN, priv->base + CRT_CTRL1); > + writel(ctrl2 | CRT_CTRL_DAC_EN, priv->base + CRT_CTRL2); > + > + ctrl1 = readl(priv->base + CRT_CTRL1); > + ctrl2 = readl(priv->base + CRT_CTRL2); > +} > + > +static void aspeed_gfx_disable_controller(struct aspeed_gfx *priv) > +{ > + u32 ctrl1 = readl(priv->base + CRT_CTRL1); > + u32 ctrl2 = readl(priv->base + CRT_CTRL2); > + > + writel(ctrl1 & ~CRT_CTRL_EN, priv->base + CRT_CTRL1); > + writel(ctrl2 & ~CRT_CTRL_DAC_EN, priv->base + CRT_CTRL2); > +} > + > +static void aspeed_gfx_crtc_mode_set_nofb(struct aspeed_gfx *priv) > +{ > + struct drm_display_mode *m = &priv->pipe.crtc.state->adjusted_mode; > + u32 ctrl1, d_offset, t_count, bpp; > + int err; > + > + err = aspeed_gfx_set_pixel_fmt(priv, &bpp); > + if (err) > + return; > + > +#if 0 > + /* TODO */ > + clk_set_rate(priv->pixel_clk, m->crtc_clock * 1000); > +#endif > + > + ctrl1 = readl(priv->base + CRT_CTRL1); > + ctrl1 &= ~(CRT_CTRL_INTERLACED | > + CRT_CTRL_HSYNC_NEGATIVE | > + CRT_CTRL_VSYNC_NEGATIVE); > + > + if (m->flags & DRM_MODE_FLAG_INTERLACE) > + ctrl1 |= CRT_CTRL_INTERLACED; > + > + if (!(m->flags & DRM_MODE_FLAG_PHSYNC)) > + ctrl1 |= CRT_CTRL_HSYNC_NEGATIVE; > + > + if (!(m->flags & DRM_MODE_FLAG_PVSYNC)) > + ctrl1 |= CRT_CTRL_VSYNC_NEGATIVE; > + > + writel(ctrl1, priv->base + CRT_CTRL1); > + > + /* Horizontal timing */ > + writel(CRT_H_TOTAL(m->htotal - 1) | CRT_H_DE(m->hdisplay - 1), > + priv->base + CRT_HORIZ0); > + writel(CRT_H_RS_START(m->hsync_start - 1) | CRT_H_RS_END(m->hsync_end), > + priv->base + CRT_HORIZ1); > + > + > + /* Vertical timing */ > + writel(CRT_V_TOTAL(m->vtotal - 1) | CRT_V_DE(m->vdisplay - 1), > + priv->base + CRT_VERT0); > + writel(CRT_V_RS_START(m->vsync_start) | CRT_V_RS_END(m->vsync_end), > + priv->base + CRT_VERT1); > + > + /* > + * Display Offset: address difference between consecutive scan lines > + * Terminal Count: memory size of one scan line > + */ > + d_offset = m->hdisplay * bpp / 8; > + t_count = (m->hdisplay * bpp + 127) / 128; > + writel(CRT_DISP_OFFSET(d_offset) | CRT_TERM_COUNT(t_count), > + priv->base + CRT_OFFSET); > + > + /* > + * Threshold: FIFO thresholds of refill and stop (16 byte chunks > + * per line, rounded up) > + */ > + writel(G5_CRT_THROD_VAL, priv->base + CRT_THROD); > +} > + > +static void aspeed_gfx_pipe_enable(struct drm_simple_display_pipe *pipe, > + struct drm_crtc_state *crtc_state) > +{ > + struct aspeed_gfx *priv = drm_pipe_to_aspeed_gfx(pipe); > + > + aspeed_gfx_crtc_mode_set_nofb(priv); > + aspeed_gfx_enable_controller(priv); > +} > + > +static void aspeed_gfx_pipe_disable(struct drm_simple_display_pipe *pipe) > +{ > + struct aspeed_gfx *priv = drm_pipe_to_aspeed_gfx(pipe); > + > + aspeed_gfx_disable_controller(priv); > +} > + > +static void aspeed_gfx_pipe_update(struct drm_simple_display_pipe *pipe, > + struct drm_plane_state *plane_state) > +{ > + struct aspeed_gfx *priv = drm_pipe_to_aspeed_gfx(pipe); > + struct drm_crtc *crtc = &pipe->crtc; > + struct drm_framebuffer *fb = pipe->plane.state->fb; > + struct drm_pending_vblank_event *event; > + struct drm_gem_cma_object *gem; > + > + if (!crtc) > + return; > + > + spin_lock_irq(&crtc->dev->event_lock); > + event = crtc->state->event; > + if (event) { > + crtc->state->event = NULL; > + > + if (drm_crtc_vblank_get(crtc) == 0) > + drm_crtc_arm_vblank_event(crtc, event); > + else > + drm_crtc_send_vblank_event(crtc, event); > + } > + spin_unlock_irq(&crtc->dev->event_lock); > + > + if (!fb) > + return; > + > + gem = drm_fb_cma_get_gem_obj(fb, 0); > + if (!gem) > + return; > + writel(gem->paddr, priv->base + CRT_ADDR); > +} > + > +static int aspeed_gfx_pipe_prepare_fb(struct drm_simple_display_pipe *pipe, > + struct drm_plane_state *plane_state) > +{ > + return drm_gem_fb_prepare_fb(&pipe->plane, plane_state); > +} > + > +static struct drm_simple_display_pipe_funcs aspeed_gfx_funcs = { > + .enable = aspeed_gfx_pipe_enable, > + .disable = aspeed_gfx_pipe_disable, > + .update = aspeed_gfx_pipe_update, > + .prepare_fb = aspeed_gfx_pipe_prepare_fb, > +}; > + > +static const uint32_t aspeed_gfx_formats[] = { > + DRM_FORMAT_XRGB8888, > + DRM_FORMAT_RGB565, > +}; > + > +int aspeed_gfx_create_pipe(struct drm_device *drm) > +{ > + struct aspeed_gfx *priv = drm->dev_private; > + > + return drm_simple_display_pipe_init(drm, &priv->pipe, &aspeed_gfx_funcs, > + aspeed_gfx_formats, > + ARRAY_SIZE(aspeed_gfx_formats), > + NULL, > + &priv->connector); > +} > diff --git a/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c b/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c > new file mode 100644 > index 000000000000..50c1931a80dd > --- /dev/null > +++ b/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c > @@ -0,0 +1,301 @@ > +// SPDX-License-Identifier: GPL-2.0+ > +// Copyright 2018 IBM Corporation > + > +#include <linux/module.h> > +#include <linux/irq.h> > +#include <linux/clk.h> > +#include <linux/of.h> > +#include <linux/of_reserved_mem.h> > +#include <linux/reset.h> > +#include <linux/regmap.h> > +#include <linux/mfd/syscon.h> > + > +#include <drm/drm_crtc_helper.h> > +#include <drm/drm_device.h> > +#include <drm/drm_fb_cma_helper.h> > +#include <drm/drm_gem_cma_helper.h> > +#include <drm/drm_gem_framebuffer_helper.h> > +#include <drm/drm_simple_kms_helper.h> > +#include <drm/drm_atomic_helper.h> > + > +#include "aspeed_gfx.h" > + > +static const struct drm_mode_config_funcs aspeed_gfx_mode_config_funcs = { > + .fb_create = drm_gem_fb_create, > + .atomic_check = drm_atomic_helper_check, > + .atomic_commit = drm_atomic_helper_commit, > +}; I wonder if .output_poll_changed = drm_fb_helper_output_poll_changed, might help your fbdev setup? > +static void aspeed_gfx_setup_mode_config(struct drm_device *drm) > +{ > + drm_mode_config_init(drm); > + > + drm->mode_config.min_width = 0; > + drm->mode_config.min_height = 0; > + drm->mode_config.max_width = 800; > + drm->mode_config.max_height = 600; > + drm->mode_config.funcs = &aspeed_gfx_mode_config_funcs; > +} > + > +static int aspeed_gfx_load(struct drm_device *drm) > +{ > + struct platform_device *pdev = to_platform_device(drm->dev); > + struct aspeed_gfx *priv; > + struct resource *res; > + int ret; > + > + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); > + if (!priv) > + return -ENOMEM; > + drm->dev_private = priv; > + > + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); > + priv->base = devm_ioremap_resource(drm->dev, res); > + if (IS_ERR(priv->base)) > + return PTR_ERR(priv->base); > + > + priv->scu = syscon_regmap_lookup_by_compatible("aspeed,ast2500-scu"); > + if (IS_ERR(priv->scu)) { > + dev_err(&pdev->dev, "failed to find SCU regmap\n"); > + return PTR_ERR(priv->scu); > + } > + > + ret = of_reserved_mem_device_init(drm->dev); > + if (ret) { > + dev_err(&pdev->dev, > + "failed to initialize reserved mem: %d\n", ret); > + return ret; > + } > + > + ret = dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32)); > + if (ret) { > + dev_err(&pdev->dev, "failed to set DMA mask: %d\n", ret); > + return ret; > + } > + > + priv->rst = devm_reset_control_get_exclusive(&pdev->dev, NULL); > + if (IS_ERR(priv->rst)) { > + dev_err(&pdev->dev, > + "missing or invalid reset controller device tree entry"); > + return PTR_ERR(priv->rst); > + } > + reset_control_deassert(priv->rst); > + > + priv->clk = devm_clk_get(drm->dev, NULL); > + if (IS_ERR(priv->clk)) { > + dev_err(&pdev->dev, > + "missing or invalid clk device tree entry"); > + return PTR_ERR(priv->clk); > + } > + clk_prepare_enable(priv->clk); > + > + /* Sanitize control registers */ > + writel(0, priv->base + CRT_CTRL1); > + writel(0, priv->base + CRT_CTRL2); > + > + aspeed_gfx_setup_mode_config(drm); > + > + ret = drm_vblank_init(drm, 1); > + if (ret < 0) { > + dev_err(drm->dev, "Failed to initialise vblank\n"); > + return ret; > + } > + > + ret = aspeed_gfx_create_output(drm); > + if (ret < 0) { > + dev_err(drm->dev, "Failed to create outputs\n"); > + return ret; > + } > + > + ret = aspeed_gfx_create_pipe(drm); > + if (ret < 0) { > + dev_err(drm->dev, "Cannot setup simple display pipe\n"); > + return ret; > + } > + > + ret = drm_irq_install(drm, platform_get_irq(pdev, 0)); > + if (ret < 0) { > + dev_err(drm->dev, "Failed to install IRQ handler\n"); > + return ret; > + } > + > + drm_mode_config_reset(drm); > + > + priv->fbdev = drm_fbdev_cma_init(drm, 32, 1); > + if (IS_ERR(priv->fbdev)) { > + ret = PTR_ERR(priv->fbdev); > + dev_err(drm->dev, "Failed to init FB CMA area\n"); > + goto err_cma; > + } I think you want to use drm_fb_cma_fbdev_init() here, which lets you drop your .lastclose. Take a look at commit bdecd83546352e0cdf54f64d8d6206f1fef32d75, for example. > + > + return 0; > + > +err_cma: > + drm_irq_uninstall(drm); > + return ret; > +} > + > +static void aspeed_gfx_unload(struct drm_device *drm) > +{ > + struct aspeed_gfx *priv = drm->dev_private; > + > + if (priv->fbdev) > + drm_fbdev_cma_fini(priv->fbdev); > + > + drm_kms_helper_poll_fini(drm); > + drm_mode_config_cleanup(drm); > + > + drm_irq_uninstall(drm); > + > + drm->dev_private = NULL; > +} > + > +static void aspeed_gfx_lastclose(struct drm_device *drm) > +{ > + struct aspeed_gfx *priv = drm->dev_private; > + > + drm_fbdev_cma_restore_mode(priv->fbdev); > +} > +static int aspeed_gfx_enable_vblank(struct drm_device *drm, unsigned int crtc) > +{ > + struct aspeed_gfx *priv = drm->dev_private; > + u32 reg = readl(priv->base + CRT_CTRL1); > + > + /* Clear pending VBLANK IRQ */ > + writel(reg | CRT_CTRL_VERTICAL_INTR_STS, priv->base + CRT_CTRL1); > + > + reg |= CRT_CTRL_VERTICAL_INTR_EN; > + writel(reg, priv->base + CRT_CTRL1); > + > + reg = readl(priv->base + CRT_CTRL1); > + > + return 0; > +} > + > +static void aspeed_gfx_disable_vblank(struct drm_device *drm, unsigned int crtc) > +{ > + struct aspeed_gfx *priv = drm->dev_private; > + u32 reg = readl(priv->base + CRT_CTRL1); > + > + reg &= ~CRT_CTRL_VERTICAL_INTR_EN; > + writel(reg, priv->base + CRT_CTRL1); > + > + /* Clear pending VBLANK IRQ */ > + writel(reg | CRT_CTRL_VERTICAL_INTR_STS, priv->base + CRT_CTRL1); > + > + reg = readl(priv->base + CRT_CTRL1); > +} > + > +static void aspeed_gfx_irq_preinstall(struct drm_device *drm) > +{ > + aspeed_gfx_disable_vblank(drm, 0); > +} > + > +static irqreturn_t aspeed_gfx_irq_handler(int irq, void *data) > +{ > + struct drm_device *drm = data; > + struct aspeed_gfx *priv = drm->dev_private; > + u32 reg; > + > + reg = readl(priv->base + CRT_CTRL1); > + > + if (reg & CRT_CTRL_VERTICAL_INTR_STS) { > + drm_crtc_handle_vblank(&priv->pipe.crtc); > + writel(reg, priv->base + CRT_CTRL1); > + return IRQ_HANDLED; > + }; > + > + return IRQ_NONE; > +} > + > +DEFINE_DRM_GEM_CMA_FOPS(fops); > + > +static struct drm_driver aspeed_gfx_driver = { > + .driver_features = DRIVER_GEM | DRIVER_MODESET | > + DRIVER_PRIME | DRIVER_ATOMIC | > + DRIVER_HAVE_IRQ, > + .lastclose = aspeed_gfx_lastclose, > + .irq_handler = aspeed_gfx_irq_handler, > + .irq_preinstall = aspeed_gfx_irq_preinstall, > + .irq_uninstall = aspeed_gfx_irq_preinstall, I suspect that uninstall shouldn't be the same as preinstall :) Actually, I think the preferred way these days is to not use the old core IRQ stuff, and just devm_request_irq(dev, platform_get_irq(pdev, 0), ...) in your _drv.c > + .enable_vblank = aspeed_gfx_enable_vblank, > + .disable_vblank = aspeed_gfx_disable_vblank, > + .gem_free_object_unlocked = drm_gem_cma_free_object, > + .gem_vm_ops = &drm_gem_cma_vm_ops, > + .dumb_create = drm_gem_cma_dumb_create, > + .prime_handle_to_fd = drm_gem_prime_handle_to_fd, > + .prime_fd_to_handle = drm_gem_prime_fd_to_handle, > + .gem_prime_export = drm_gem_prime_export, > + .gem_prime_import = drm_gem_prime_import, > + .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table, > + .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table, > + .gem_prime_vmap = drm_gem_cma_prime_vmap, > + .gem_prime_vunmap = drm_gem_cma_prime_vunmap, > + .gem_prime_mmap = drm_gem_cma_prime_mmap, > + .fops = &fops, > + .name = "aspeed-gfx-drm", > + .desc = "ASPEED GFX DRM", > + .date = "20180319", > + .major = 1, > + .minor = 0, > +}; > + > +static const struct of_device_id aspeed_gfx_match[] = { > + { .compatible = "aspeed,ast2400-gfx" }, > + { .compatible = "aspeed,ast2500-gfx" }, > + { } > +}; > + > +static int aspeed_gfx_probe(struct platform_device *pdev) > +{ > + struct drm_device *drm; > + int ret; > + > + drm = drm_dev_alloc(&aspeed_gfx_driver, &pdev->dev); > + if (IS_ERR(drm)) > + return PTR_ERR(drm); > + > + ret = aspeed_gfx_load(drm); > + if (ret) > + goto err_free; > + > + ret = drm_dev_register(drm, 0); > + if (ret) > + goto err_unload; > + > + return 0; > + > +err_unload: > + aspeed_gfx_unload(drm); > +err_free: > + drm_dev_unref(drm); > + > + return ret; > +} > + > +static int aspeed_gfx_remove(struct platform_device *pdev) > +{ > + struct drm_device *drm = platform_get_drvdata(pdev); > + > + drm_dev_unregister(drm); > + aspeed_gfx_unload(drm); > + drm_dev_unref(drm); > + > + return 0; > +} > + > +static struct platform_driver aspeed_gfx_platform_driver = { > + .probe = aspeed_gfx_probe, > + .remove = aspeed_gfx_remove, > + .driver = { > + .name = "aspeed_gfx", > + .of_match_table = aspeed_gfx_match, > + }, > +}; > + > +module_platform_driver(aspeed_gfx_platform_driver); > + > +MODULE_AUTHOR("Joel Stanley <joel@jms.id.au>"); > +MODULE_DESCRIPTION("ASPEED BMC DRM/KMS driver"); > +MODULE_LICENSE("GPL"); > diff --git a/drivers/gpu/drm/aspeed/aspeed_gfx_out.c b/drivers/gpu/drm/aspeed/aspeed_gfx_out.c > new file mode 100644 > index 000000000000..aee30ff05467 > --- /dev/null > +++ b/drivers/gpu/drm/aspeed/aspeed_gfx_out.c > @@ -0,0 +1,48 @@ > +// SPDX-License-Identifier: GPL-2.0+ > +// Copyright 2018 IBM Corporation > + > +#include <drm/drmP.h> > +#include <drm/drm_connector.h> > +#include <drm/drm_atomic_helper.h> > +#include <drm/drm_crtc_helper.h> > + > +#include "aspeed_gfx.h" > + > +static int aspeed_gfx_get_modes(struct drm_connector *connector) > +{ > + return drm_add_modes_noedid(connector, 800, 600); > +} > + > +static const struct > +drm_connector_helper_funcs aspeed_gfx_connector_helper_funcs = { > + .get_modes = aspeed_gfx_get_modes, > +}; > + > +static void aspeed_gfx_connector_destroy(struct drm_connector *connector) > +{ > + drm_connector_unregister(connector); > + drm_connector_cleanup(connector); > +} > + > +static const struct drm_connector_funcs aspeed_gfx_connector_funcs = { > + .fill_modes = drm_helper_probe_single_connector_modes, > + .destroy = aspeed_gfx_connector_destroy, > + .reset = drm_atomic_helper_connector_reset, > + .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, > + .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, > +}; > + > +int aspeed_gfx_create_output(struct drm_device *drm) > +{ > + struct aspeed_gfx *priv = drm->dev_private; > + int ret; > + > + priv->connector.dpms = DRM_MODE_DPMS_OFF; I see this DPMS line present in other drivers, but I'm skeptical of it. > + priv->connector.polled = 0; > + drm_connector_helper_add(&priv->connector, > + &aspeed_gfx_connector_helper_funcs); > + ret = drm_connector_init(drm, &priv->connector, > + &aspeed_gfx_connector_funcs, > + DRM_MODE_CONNECTOR_Unknown); > + return ret; > +} > -- > 2.17.0 > > _______________________________________________ > dri-devel mailing list > dri-devel@lists.freedesktop.org > https://lists.freedesktop.org/mailman/listinfo/dri-devel
Hi Eric, Thanks for your reply back in April. I have finally found some time to get back to this. On 18 April 2018 at 03:43, Eric Anholt <eric@anholt.net> wrote: > Joel Stanley <joel@jms.id.au> writes: > >> This driver is for the ASPEED BMC SoC's GFX display hardware. This >> driver runs on the ARM based BMC systems, unlike the ast driver which >> runs on a host CPU and is is for a PCIe graphics device that happens to >> live in the BMC's silicon, but is otherwise available for use by the BMC. >> >> The AST2500 supports a total of 3 output paths: >> >> 1. VGA output (aka host PCIe graphics device), the output target can >> choose either or both to the DAC or DVO interface. >> >> 2. Graphics CRT output, the output target can choose either or both to >> the DAC or DVO interface. >> >> 3. Video input from DVO, the video input can be used for video engine >> capture or DAC display output. >> >> Output options for are selected in SCU2C. This must be toggled by the >> BMC in order to select between the host and BMC's display output. >> >> The "VGA mode" device is the PCI attached controller. The "Graphics CRT" >> is the BMC's internal display controller. >> >> This driver only supports a simple configuration consisting of a 40MHz >> pixel clock (fixed by hardware limitations) and the VGA output path. > > The confusing part of this driver to me is understanding where this > display output is going -- if you're going out a VGA connector to a > monitor (is that what "DAC" meant?), we ought to have > DRM_MODE_CONNECTOR_VGA and a .get_modes that does I2C to get the EDID. > If it's fed into the input of some other display controller, then I'm > not sure what's the right thing to do. Yes, DAC is what the datasheet calls the VGA connector. The hardware has optional i2c lines, but they are not hooked up on any of the systems I have access to. I think most systems hard code a single mode, and this is the approach we have taken when integrating this driver into OpenBMC. > > I'd recommend moving some of this commit message into kerneldoc in the > _drv.c explaining what the HW does and what parts of the HW the driver > exposes. Good idea. > >> Signed-off-by: Joel Stanley <joel@jms.id.au> >> --- >> >> Hello! >> >> This driver is working on hardware, with a few oddities. The things that >> I know need cleaning up are: >> >> - clocks: The device can source a clock from three different sources, >> but they depend on the configuration of other devices in the system >> (the USB PHY and the 'host' display controller). For this reason we >> limit the driver to the 40MHz pixel clock that comes from the USB >> PHY. > > You may want to look into setting up a little mux clock provider that > can source from whatever parents are available to get you the best, > faster-than-requested clock. Then, if the rate it gives you is too far > off from what you wanted, maybe stretch the hblank intervals of your > modeline to get as close to the target vrefresh as possible (check out > vc4_dsi.c:vc4_dsi_encoder_mode_fixup() for an example of doing this) > >> - Setting an initial mode. I can only get the system to output when >> running X. fbset and fb-test can't seem to do this on their own. The >> system this is being developed for intends to run a simple fbterm >> based application, so this needs fixing. > > Not sure what would be going on here. You do have all of the DRM FB > emulation bits enabled, right? I sorted this out in the end. I had the enable_vblank/disable_vblank callbacks hooked up to struct drm_driver. As I was using the drm_simple stuff, it adds it's own enable_vblank on struct drm_crtc_funcs (which then pokes into struct drm_simple_display_pipe to grab the real vblank, if it exists). The fb enable code checks to see if drm_crtc_funcs->enable_vblank exists, and if it does, calls that and returns without calling the one on struct drm_driver. Once I discovered that having enable_vblank on drm_driver is depreciated, the solution became obvious. > >> I wanted to get feedback on the way the driver is structured, and if >> possible a some advice on why fb tools can't set a mode themselves. > > drm_simple_display_pipe seems like a good way to get started. > Eventually to merge you'll need a DT binding document > (Documentation/devicetree/bindings/display) > >> diff --git a/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c b/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c >> +#include "aspeed_gfx.h" >> + >> +static const struct drm_mode_config_funcs aspeed_gfx_mode_config_funcs = { >> + .fb_create = drm_gem_fb_create, >> + .atomic_check = drm_atomic_helper_check, >> + .atomic_commit = drm_atomic_helper_commit, >> +}; > > I wonder if .output_poll_changed = drm_fb_helper_output_poll_changed, > might help your fbdev setup? fwiw this did not help. > >> +static void aspeed_gfx_setup_mode_config(struct drm_device *drm) >> +{ >> + drm_mode_config_init(drm); >> + >> + drm->mode_config.min_width = 0; >> + drm->mode_config.min_height = 0; >> + drm->mode_config.max_width = 800; >> + drm->mode_config.max_height = 600; >> + drm->mode_config.funcs = &aspeed_gfx_mode_config_funcs; >> +} >> + >> +static int aspeed_gfx_load(struct drm_device *drm) >> +{ >> + >> + ret = drm_irq_install(drm, platform_get_irq(pdev, 0)); >> + if (ret < 0) { >> + dev_err(drm->dev, "Failed to install IRQ handler\n"); >> + return ret; >> + } >> + >> + drm_mode_config_reset(drm); >> + >> + priv->fbdev = drm_fbdev_cma_init(drm, 32, 1); >> + if (IS_ERR(priv->fbdev)) { >> + ret = PTR_ERR(priv->fbdev); >> + dev_err(drm->dev, "Failed to init FB CMA area\n"); >> + goto err_cma; >> + } > > I think you want to use drm_fb_cma_fbdev_init() here, which lets you > drop your .lastclose. Take a look at commit > bdecd83546352e0cdf54f64d8d6206f1fef32d75, for example. Nice. > >> + >> + return 0; >> + >> +err_cma: >> + drm_irq_uninstall(drm); >> + return ret; >> +} >> + >> +static struct drm_driver aspeed_gfx_driver = { >> + .driver_features = DRIVER_GEM | DRIVER_MODESET | >> + DRIVER_PRIME | DRIVER_ATOMIC | >> + DRIVER_HAVE_IRQ, >> + .lastclose = aspeed_gfx_lastclose, >> + .irq_handler = aspeed_gfx_irq_handler, >> + .irq_preinstall = aspeed_gfx_irq_preinstall, >> + .irq_uninstall = aspeed_gfx_irq_preinstall, > > I suspect that uninstall shouldn't be the same as preinstall :) > > Actually, I think the preferred way these days is to not use the old > core IRQ stuff, and just devm_request_irq(dev, platform_get_irq(pdev, > 0), ...) in your _drv.c Sounds good. > >> + .enable_vblank = aspeed_gfx_enable_vblank, >> + .disable_vblank = aspeed_gfx_disable_vblank, >> + .gem_free_object_unlocked = drm_gem_cma_free_object, >> + .gem_vm_ops = &drm_gem_cma_vm_ops, >> + .dumb_create = drm_gem_cma_dumb_create, >> + .prime_handle_to_fd = drm_gem_prime_handle_to_fd, >> + .prime_fd_to_handle = drm_gem_prime_fd_to_handle, >> + .gem_prime_export = drm_gem_prime_export, >> + .gem_prime_import = drm_gem_prime_import, >> + .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table, >> + .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table, >> + .gem_prime_vmap = drm_gem_cma_prime_vmap, >> + .gem_prime_vunmap = drm_gem_cma_prime_vunmap, >> + .gem_prime_mmap = drm_gem_cma_prime_mmap, >> + .fops = &fops, >> + .name = "aspeed-gfx-drm", >> + .desc = "ASPEED GFX DRM", >> + .date = "20180319", >> + .major = 1, >> + .minor = 0, >> +}; >> + >> diff --git a/drivers/gpu/drm/aspeed/aspeed_gfx_out.c b/drivers/gpu/drm/aspeed/aspeed_gfx_out.c >> +int aspeed_gfx_create_output(struct drm_device *drm) >> +{ >> + struct aspeed_gfx *priv = drm->dev_private; >> + int ret; >> + >> + priv->connector.dpms = DRM_MODE_DPMS_OFF; > > I see this DPMS line present in other drivers, but I'm skeptical of it. I'll test without this line. Thanks for the review!
diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig index deeefa7a1773..ee6c17fc0b9e 100644 --- a/drivers/gpu/drm/Kconfig +++ b/drivers/gpu/drm/Kconfig @@ -289,6 +289,8 @@ source "drivers/gpu/drm/pl111/Kconfig" source "drivers/gpu/drm/tve200/Kconfig" +source "drivers/gpu/drm/aspeed/Kconfig" + # Keep legacy drivers last menuconfig DRM_LEGACY diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile index 50093ff4479b..4ec875d9e2ff 100644 --- a/drivers/gpu/drm/Makefile +++ b/drivers/gpu/drm/Makefile @@ -103,3 +103,4 @@ obj-$(CONFIG_DRM_MXSFB) += mxsfb/ obj-$(CONFIG_DRM_TINYDRM) += tinydrm/ obj-$(CONFIG_DRM_PL111) += pl111/ obj-$(CONFIG_DRM_TVE200) += tve200/ +obj-$(CONFIG_DRM_ASPEED_GFX) += aspeed/ diff --git a/drivers/gpu/drm/aspeed/Kconfig b/drivers/gpu/drm/aspeed/Kconfig new file mode 100644 index 000000000000..6f1e64c0a6ce --- /dev/null +++ b/drivers/gpu/drm/aspeed/Kconfig @@ -0,0 +1,15 @@ +config DRM_ASPEED_GFX + tristate "ASPEED BMC Display Controller" + depends on DRM && OF + select DRM_KMS_HELPER + select DRM_KMS_FB_HELPER + select DRM_KMS_CMA_HELPER + select DRM_PANEL + select DMA_CMA + select CMA + select MFD_SYSCON + help + Chose this option if you have an ASPEED AST2400/AST2500 + SOC Display Controller (aka GFX). + + If M is selected this module will be called aspeed_gfx. diff --git a/drivers/gpu/drm/aspeed/Makefile b/drivers/gpu/drm/aspeed/Makefile new file mode 100644 index 000000000000..6e194cd790d8 --- /dev/null +++ b/drivers/gpu/drm/aspeed/Makefile @@ -0,0 +1,3 @@ +aspeed_gfx-y := aspeed_gfx_drv.o aspeed_gfx_crtc.o aspeed_gfx_out.o + +obj-$(CONFIG_DRM_ASPEED_GFX) += aspeed_gfx.o diff --git a/drivers/gpu/drm/aspeed/aspeed_gfx.h b/drivers/gpu/drm/aspeed/aspeed_gfx.h new file mode 100644 index 000000000000..fb56e425bd48 --- /dev/null +++ b/drivers/gpu/drm/aspeed/aspeed_gfx.h @@ -0,0 +1,104 @@ +// SPDX-License-Identifier: GPL-2.0+ +// Copyright 2018 IBM Corporation + +#include <drm/drmP.h> +#include <drm/drm_simple_kms_helper.h> + +struct aspeed_gfx { + void __iomem *base; + struct clk *clk; + struct reset_control *rst; + struct regmap *scu; + + struct drm_simple_display_pipe pipe; + struct drm_connector connector; + struct drm_fbdev_cma *fbdev; +}; + +int aspeed_gfx_create_pipe(struct drm_device *drm); +int aspeed_gfx_create_output(struct drm_device *drm); + +#define CRT_CTRL1 0x60 /* CRT Control I */ +#define CRT_CTRL2 0x64 /* CRT Control II */ +#define CRT_STATUS 0x68 /* CRT Status */ +#define CRT_MISC 0x6c /* CRT Misc Setting */ +#define CRT_HORIZ0 0x70 /* CRT Horizontal Total & Display Enable End */ +#define CRT_HORIZ1 0x74 /* CRT Horizontal Retrace Start & End */ +#define CRT_VERT0 0x78 /* CRT Vertical Total & Display Enable End */ +#define CRT_VERT1 0x7C /* CRT Vertical Retrace Start & End */ +#define CRT_ADDR 0x80 /* CRT Display Starting Address */ +#define CRT_OFFSET 0x84 /* CRT Display Offset & Terminal Count */ +#define CRT_THROD 0x88 /* CRT Threshold */ +#define CRT_XSCALE 0x8C /* CRT Scaling-Up Factor */ +#define CRT_CURSOR0 0x90 /* CRT Hardware Cursor X & Y Offset */ +#define CRT_CURSOR1 0x94 /* CRT Hardware Cursor X & Y Position */ +#define CRT_CURSOR2 0x98 /* CRT Hardware Cursor Pattern Address */ +#define CRT_9C 0x9C +#define CRT_OSD_H 0xA0 /* CRT OSD Horizontal Start/End */ +#define CRT_OSD_V 0xA4 /* CRT OSD Vertical Start/End */ +#define CRT_OSD_ADDR 0xA8 /* CRT OSD Pattern Address */ +#define CRT_OSD_DISP 0xAC /* CRT OSD Offset */ +#define CRT_OSD_THRESH 0xB0 /* CRT OSD Threshold & Alpha */ +#define CRT_B4 0xB4 +#define CRT_STS_V 0xB8 /* CRT Status V */ +#define CRT_SCRATCH 0xBC /* Scratchpad */ +#define CRT_BB0_ADDR 0xD0 /* CRT Display BB0 Starting Address */ +#define CRT_BB1_ADDR 0xD4 /* CRT Display BB1 Starting Address */ +#define CRT_BB_COUNT 0xD8 /* CRT Display BB Terminal Count */ +#define OSD_COLOR1 0xE0 /* OSD Color Palette Index 1 & 0 */ +#define OSD_COLOR2 0xE4 /* OSD Color Palette Index 3 & 2 */ +#define OSD_COLOR3 0xE8 /* OSD Color Palette Index 5 & 4 */ +#define OSD_COLOR4 0xEC /* OSD Color Palette Index 7 & 6 */ +#define OSD_COLOR5 0xF0 /* OSD Color Palette Index 9 & 8 */ +#define OSD_COLOR6 0xF4 /* OSD Color Palette Index 11 & 10 */ +#define OSD_COLOR7 0xF8 /* OSD Color Palette Index 13 & 12 */ +#define OSD_COLOR8 0xFC /* OSD Color Palette Index 15 & 14 */ + +/* CTRL1 */ +#define CRT_CTRL_EN BIT(0) +#define CRT_CTRL_HW_CURSOR_EN BIT(1) +#define CRT_CTRL_OSD_EN BIT(2) +#define CRT_CTRL_INTERLACED BIT(3) +#define CRT_CTRL_COLOR_RGB565 (0 << 7) +#define CRT_CTRL_COLOR_YUV444 (1 << 7) +#define CRT_CTRL_COLOR_XRGB8888 (2 << 7) +#define CRT_CTRL_COLOR_RGB888 (3 << 7) +#define CRT_CTRL_COLOR_YUV444_2RGB (5 << 7) +#define CRT_CTRL_COLOR_YUV422 (7 << 7) +#define CRT_CTRL_COLOR_MASK GENMASK(9, 7) +#define CRT_CTRL_HSYNC_NEGATIVE BIT(16) +#define CRT_CTRL_VSYNC_NEGATIVE BIT(17) +#define CRT_CTRL_VERTICAL_INTR_EN BIT(30) +#define CRT_CTRL_VERTICAL_INTR_STS BIT(31) + +/* CTRL2 */ +#define CRT_CTRL_DAC_EN BIT(0) +#define CRT_CTRL_VBLANK_LINE(x) (((x) << 20) & CRT_CTRL_VBLANK_LINE_MASK) +#define CRT_CTRL_VBLANK_LINE_MASK GENMASK(20, 31) + +/* CRT_HORIZ0 */ +#define CRT_H_TOTAL(x) (x) +#define CRT_H_DE(x) ((x) << 16) + +/* CRT_HORIZ1 */ +#define CRT_H_RS_START(x) (x) +#define CRT_H_RS_END(x) ((x) << 16) + +/* CRT_VIRT0 */ +#define CRT_V_TOTAL(x) (x) +#define CRT_V_DE(x) ((x) << 16) + +/* CRT_VIRT1 */ +#define CRT_V_RS_START(x) (x) +#define CRT_V_RS_END(x) ((x) << 16) + +/* CRT_OFFSET */ +#define CRT_DISP_OFFSET(x) (x) +#define CRT_TERM_COUNT(x) ((x) << 16) + +/* CRT_THROD */ +#define CRT_THROD_LOW(x) (x) +#define CRT_THROD_HIGH(x) ((x) << 8) + +/* Default Threshold Seting */ +#define G5_CRT_THROD_VAL (CRT_THROD_LOW(0x24) | CRT_THROD_HIGH(0x3C)) diff --git a/drivers/gpu/drm/aspeed/aspeed_gfx_crtc.c b/drivers/gpu/drm/aspeed/aspeed_gfx_crtc.c new file mode 100644 index 000000000000..849688635ff3 --- /dev/null +++ b/drivers/gpu/drm/aspeed/aspeed_gfx_crtc.c @@ -0,0 +1,215 @@ +// SPDX-License-Identifier: GPL-2.0+ +// Copyright 2018 IBM Corporation + +#include <linux/clk.h> +#include <linux/reset.h> +#include <linux/regmap.h> + +#include <drm/drm_crtc_helper.h> +#include <drm/drm_device.h> +#include <drm/drm_fb_cma_helper.h> +#include <drm/drm_gem_cma_helper.h> +#include <drm/drm_simple_kms_helper.h> +#include <drm/drm_gem_framebuffer_helper.h> +#include <drm/drm_panel.h> + +#include "aspeed_gfx.h" + +static struct aspeed_gfx * +drm_pipe_to_aspeed_gfx(struct drm_simple_display_pipe *pipe) +{ + return container_of(pipe, struct aspeed_gfx, pipe); +} + +static int aspeed_gfx_set_pixel_fmt(struct aspeed_gfx *priv, u32 *bpp) +{ + struct drm_crtc *crtc = &priv->pipe.crtc; + struct drm_device *drm = crtc->dev; + const u32 format = crtc->primary->state->fb->format->format; + u32 ctrl1; + + ctrl1 = readl(priv->base + CRT_CTRL1); + ctrl1 &= ~CRT_CTRL_COLOR_MASK; + + switch (format) { + case DRM_FORMAT_RGB565: + dev_dbg(drm->dev, "Setting up RGB565 mode\n"); + ctrl1 |= CRT_CTRL_COLOR_RGB565; + *bpp = 16; + break; + case DRM_FORMAT_XRGB8888: + dev_dbg(drm->dev, "Setting up XRGB8888 mode\n"); + ctrl1 |= CRT_CTRL_COLOR_XRGB8888; + *bpp = 32; + break; + default: + dev_err(drm->dev, "Unhandled pixel format %08x\n", format); + return -EINVAL; + } + + writel(ctrl1, priv->base + CRT_CTRL1); + + return 0; +} + +static void aspeed_gfx_enable_controller(struct aspeed_gfx *priv) +{ + u32 ctrl1 = readl(priv->base + CRT_CTRL1); + u32 ctrl2 = readl(priv->base + CRT_CTRL2); + + /* SCU2C: set DAC source for display output to Graphics CRT (GFX) */ + regmap_update_bits(priv->scu, 0x2c, BIT(16), BIT(16)); + + writel(ctrl1 | CRT_CTRL_EN, priv->base + CRT_CTRL1); + writel(ctrl2 | CRT_CTRL_DAC_EN, priv->base + CRT_CTRL2); + + ctrl1 = readl(priv->base + CRT_CTRL1); + ctrl2 = readl(priv->base + CRT_CTRL2); +} + +static void aspeed_gfx_disable_controller(struct aspeed_gfx *priv) +{ + u32 ctrl1 = readl(priv->base + CRT_CTRL1); + u32 ctrl2 = readl(priv->base + CRT_CTRL2); + + writel(ctrl1 & ~CRT_CTRL_EN, priv->base + CRT_CTRL1); + writel(ctrl2 & ~CRT_CTRL_DAC_EN, priv->base + CRT_CTRL2); +} + +static void aspeed_gfx_crtc_mode_set_nofb(struct aspeed_gfx *priv) +{ + struct drm_display_mode *m = &priv->pipe.crtc.state->adjusted_mode; + u32 ctrl1, d_offset, t_count, bpp; + int err; + + err = aspeed_gfx_set_pixel_fmt(priv, &bpp); + if (err) + return; + +#if 0 + /* TODO */ + clk_set_rate(priv->pixel_clk, m->crtc_clock * 1000); +#endif + + ctrl1 = readl(priv->base + CRT_CTRL1); + ctrl1 &= ~(CRT_CTRL_INTERLACED | + CRT_CTRL_HSYNC_NEGATIVE | + CRT_CTRL_VSYNC_NEGATIVE); + + if (m->flags & DRM_MODE_FLAG_INTERLACE) + ctrl1 |= CRT_CTRL_INTERLACED; + + if (!(m->flags & DRM_MODE_FLAG_PHSYNC)) + ctrl1 |= CRT_CTRL_HSYNC_NEGATIVE; + + if (!(m->flags & DRM_MODE_FLAG_PVSYNC)) + ctrl1 |= CRT_CTRL_VSYNC_NEGATIVE; + + writel(ctrl1, priv->base + CRT_CTRL1); + + /* Horizontal timing */ + writel(CRT_H_TOTAL(m->htotal - 1) | CRT_H_DE(m->hdisplay - 1), + priv->base + CRT_HORIZ0); + writel(CRT_H_RS_START(m->hsync_start - 1) | CRT_H_RS_END(m->hsync_end), + priv->base + CRT_HORIZ1); + + + /* Vertical timing */ + writel(CRT_V_TOTAL(m->vtotal - 1) | CRT_V_DE(m->vdisplay - 1), + priv->base + CRT_VERT0); + writel(CRT_V_RS_START(m->vsync_start) | CRT_V_RS_END(m->vsync_end), + priv->base + CRT_VERT1); + + /* + * Display Offset: address difference between consecutive scan lines + * Terminal Count: memory size of one scan line + */ + d_offset = m->hdisplay * bpp / 8; + t_count = (m->hdisplay * bpp + 127) / 128; + writel(CRT_DISP_OFFSET(d_offset) | CRT_TERM_COUNT(t_count), + priv->base + CRT_OFFSET); + + /* + * Threshold: FIFO thresholds of refill and stop (16 byte chunks + * per line, rounded up) + */ + writel(G5_CRT_THROD_VAL, priv->base + CRT_THROD); +} + +static void aspeed_gfx_pipe_enable(struct drm_simple_display_pipe *pipe, + struct drm_crtc_state *crtc_state) +{ + struct aspeed_gfx *priv = drm_pipe_to_aspeed_gfx(pipe); + + aspeed_gfx_crtc_mode_set_nofb(priv); + aspeed_gfx_enable_controller(priv); +} + +static void aspeed_gfx_pipe_disable(struct drm_simple_display_pipe *pipe) +{ + struct aspeed_gfx *priv = drm_pipe_to_aspeed_gfx(pipe); + + aspeed_gfx_disable_controller(priv); +} + +static void aspeed_gfx_pipe_update(struct drm_simple_display_pipe *pipe, + struct drm_plane_state *plane_state) +{ + struct aspeed_gfx *priv = drm_pipe_to_aspeed_gfx(pipe); + struct drm_crtc *crtc = &pipe->crtc; + struct drm_framebuffer *fb = pipe->plane.state->fb; + struct drm_pending_vblank_event *event; + struct drm_gem_cma_object *gem; + + if (!crtc) + return; + + spin_lock_irq(&crtc->dev->event_lock); + event = crtc->state->event; + if (event) { + crtc->state->event = NULL; + + if (drm_crtc_vblank_get(crtc) == 0) + drm_crtc_arm_vblank_event(crtc, event); + else + drm_crtc_send_vblank_event(crtc, event); + } + spin_unlock_irq(&crtc->dev->event_lock); + + if (!fb) + return; + + gem = drm_fb_cma_get_gem_obj(fb, 0); + if (!gem) + return; + writel(gem->paddr, priv->base + CRT_ADDR); +} + +static int aspeed_gfx_pipe_prepare_fb(struct drm_simple_display_pipe *pipe, + struct drm_plane_state *plane_state) +{ + return drm_gem_fb_prepare_fb(&pipe->plane, plane_state); +} + +static struct drm_simple_display_pipe_funcs aspeed_gfx_funcs = { + .enable = aspeed_gfx_pipe_enable, + .disable = aspeed_gfx_pipe_disable, + .update = aspeed_gfx_pipe_update, + .prepare_fb = aspeed_gfx_pipe_prepare_fb, +}; + +static const uint32_t aspeed_gfx_formats[] = { + DRM_FORMAT_XRGB8888, + DRM_FORMAT_RGB565, +}; + +int aspeed_gfx_create_pipe(struct drm_device *drm) +{ + struct aspeed_gfx *priv = drm->dev_private; + + return drm_simple_display_pipe_init(drm, &priv->pipe, &aspeed_gfx_funcs, + aspeed_gfx_formats, + ARRAY_SIZE(aspeed_gfx_formats), + NULL, + &priv->connector); +} diff --git a/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c b/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c new file mode 100644 index 000000000000..50c1931a80dd --- /dev/null +++ b/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c @@ -0,0 +1,301 @@ +// SPDX-License-Identifier: GPL-2.0+ +// Copyright 2018 IBM Corporation + +#include <linux/module.h> +#include <linux/irq.h> +#include <linux/clk.h> +#include <linux/of.h> +#include <linux/of_reserved_mem.h> +#include <linux/reset.h> +#include <linux/regmap.h> +#include <linux/mfd/syscon.h> + +#include <drm/drm_crtc_helper.h> +#include <drm/drm_device.h> +#include <drm/drm_fb_cma_helper.h> +#include <drm/drm_gem_cma_helper.h> +#include <drm/drm_gem_framebuffer_helper.h> +#include <drm/drm_simple_kms_helper.h> +#include <drm/drm_atomic_helper.h> + +#include "aspeed_gfx.h" + +static const struct drm_mode_config_funcs aspeed_gfx_mode_config_funcs = { + .fb_create = drm_gem_fb_create, + .atomic_check = drm_atomic_helper_check, + .atomic_commit = drm_atomic_helper_commit, +}; + +static void aspeed_gfx_setup_mode_config(struct drm_device *drm) +{ + drm_mode_config_init(drm); + + drm->mode_config.min_width = 0; + drm->mode_config.min_height = 0; + drm->mode_config.max_width = 800; + drm->mode_config.max_height = 600; + drm->mode_config.funcs = &aspeed_gfx_mode_config_funcs; +} + +static int aspeed_gfx_load(struct drm_device *drm) +{ + struct platform_device *pdev = to_platform_device(drm->dev); + struct aspeed_gfx *priv; + struct resource *res; + int ret; + + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + drm->dev_private = priv; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + priv->base = devm_ioremap_resource(drm->dev, res); + if (IS_ERR(priv->base)) + return PTR_ERR(priv->base); + + priv->scu = syscon_regmap_lookup_by_compatible("aspeed,ast2500-scu"); + if (IS_ERR(priv->scu)) { + dev_err(&pdev->dev, "failed to find SCU regmap\n"); + return PTR_ERR(priv->scu); + } + + ret = of_reserved_mem_device_init(drm->dev); + if (ret) { + dev_err(&pdev->dev, + "failed to initialize reserved mem: %d\n", ret); + return ret; + } + + ret = dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32)); + if (ret) { + dev_err(&pdev->dev, "failed to set DMA mask: %d\n", ret); + return ret; + } + + priv->rst = devm_reset_control_get_exclusive(&pdev->dev, NULL); + if (IS_ERR(priv->rst)) { + dev_err(&pdev->dev, + "missing or invalid reset controller device tree entry"); + return PTR_ERR(priv->rst); + } + reset_control_deassert(priv->rst); + + priv->clk = devm_clk_get(drm->dev, NULL); + if (IS_ERR(priv->clk)) { + dev_err(&pdev->dev, + "missing or invalid clk device tree entry"); + return PTR_ERR(priv->clk); + } + clk_prepare_enable(priv->clk); + + /* Sanitize control registers */ + writel(0, priv->base + CRT_CTRL1); + writel(0, priv->base + CRT_CTRL2); + + aspeed_gfx_setup_mode_config(drm); + + ret = drm_vblank_init(drm, 1); + if (ret < 0) { + dev_err(drm->dev, "Failed to initialise vblank\n"); + return ret; + } + + ret = aspeed_gfx_create_output(drm); + if (ret < 0) { + dev_err(drm->dev, "Failed to create outputs\n"); + return ret; + } + + ret = aspeed_gfx_create_pipe(drm); + if (ret < 0) { + dev_err(drm->dev, "Cannot setup simple display pipe\n"); + return ret; + } + + ret = drm_irq_install(drm, platform_get_irq(pdev, 0)); + if (ret < 0) { + dev_err(drm->dev, "Failed to install IRQ handler\n"); + return ret; + } + + drm_mode_config_reset(drm); + + priv->fbdev = drm_fbdev_cma_init(drm, 32, 1); + if (IS_ERR(priv->fbdev)) { + ret = PTR_ERR(priv->fbdev); + dev_err(drm->dev, "Failed to init FB CMA area\n"); + goto err_cma; + } + + return 0; + +err_cma: + drm_irq_uninstall(drm); + return ret; +} + +static void aspeed_gfx_unload(struct drm_device *drm) +{ + struct aspeed_gfx *priv = drm->dev_private; + + if (priv->fbdev) + drm_fbdev_cma_fini(priv->fbdev); + + drm_kms_helper_poll_fini(drm); + drm_mode_config_cleanup(drm); + + drm_irq_uninstall(drm); + + drm->dev_private = NULL; +} + +static void aspeed_gfx_lastclose(struct drm_device *drm) +{ + struct aspeed_gfx *priv = drm->dev_private; + + drm_fbdev_cma_restore_mode(priv->fbdev); +} + +static int aspeed_gfx_enable_vblank(struct drm_device *drm, unsigned int crtc) +{ + struct aspeed_gfx *priv = drm->dev_private; + u32 reg = readl(priv->base + CRT_CTRL1); + + /* Clear pending VBLANK IRQ */ + writel(reg | CRT_CTRL_VERTICAL_INTR_STS, priv->base + CRT_CTRL1); + + reg |= CRT_CTRL_VERTICAL_INTR_EN; + writel(reg, priv->base + CRT_CTRL1); + + reg = readl(priv->base + CRT_CTRL1); + + return 0; +} + +static void aspeed_gfx_disable_vblank(struct drm_device *drm, unsigned int crtc) +{ + struct aspeed_gfx *priv = drm->dev_private; + u32 reg = readl(priv->base + CRT_CTRL1); + + reg &= ~CRT_CTRL_VERTICAL_INTR_EN; + writel(reg, priv->base + CRT_CTRL1); + + /* Clear pending VBLANK IRQ */ + writel(reg | CRT_CTRL_VERTICAL_INTR_STS, priv->base + CRT_CTRL1); + + reg = readl(priv->base + CRT_CTRL1); +} + +static void aspeed_gfx_irq_preinstall(struct drm_device *drm) +{ + aspeed_gfx_disable_vblank(drm, 0); +} + +static irqreturn_t aspeed_gfx_irq_handler(int irq, void *data) +{ + struct drm_device *drm = data; + struct aspeed_gfx *priv = drm->dev_private; + u32 reg; + + reg = readl(priv->base + CRT_CTRL1); + + if (reg & CRT_CTRL_VERTICAL_INTR_STS) { + drm_crtc_handle_vblank(&priv->pipe.crtc); + writel(reg, priv->base + CRT_CTRL1); + return IRQ_HANDLED; + }; + + return IRQ_NONE; +} + +DEFINE_DRM_GEM_CMA_FOPS(fops); + +static struct drm_driver aspeed_gfx_driver = { + .driver_features = DRIVER_GEM | DRIVER_MODESET | + DRIVER_PRIME | DRIVER_ATOMIC | + DRIVER_HAVE_IRQ, + .lastclose = aspeed_gfx_lastclose, + .irq_handler = aspeed_gfx_irq_handler, + .irq_preinstall = aspeed_gfx_irq_preinstall, + .irq_uninstall = aspeed_gfx_irq_preinstall, + .enable_vblank = aspeed_gfx_enable_vblank, + .disable_vblank = aspeed_gfx_disable_vblank, + .gem_free_object_unlocked = drm_gem_cma_free_object, + .gem_vm_ops = &drm_gem_cma_vm_ops, + .dumb_create = drm_gem_cma_dumb_create, + .prime_handle_to_fd = drm_gem_prime_handle_to_fd, + .prime_fd_to_handle = drm_gem_prime_fd_to_handle, + .gem_prime_export = drm_gem_prime_export, + .gem_prime_import = drm_gem_prime_import, + .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table, + .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table, + .gem_prime_vmap = drm_gem_cma_prime_vmap, + .gem_prime_vunmap = drm_gem_cma_prime_vunmap, + .gem_prime_mmap = drm_gem_cma_prime_mmap, + .fops = &fops, + .name = "aspeed-gfx-drm", + .desc = "ASPEED GFX DRM", + .date = "20180319", + .major = 1, + .minor = 0, +}; + +static const struct of_device_id aspeed_gfx_match[] = { + { .compatible = "aspeed,ast2400-gfx" }, + { .compatible = "aspeed,ast2500-gfx" }, + { } +}; + +static int aspeed_gfx_probe(struct platform_device *pdev) +{ + struct drm_device *drm; + int ret; + + drm = drm_dev_alloc(&aspeed_gfx_driver, &pdev->dev); + if (IS_ERR(drm)) + return PTR_ERR(drm); + + ret = aspeed_gfx_load(drm); + if (ret) + goto err_free; + + ret = drm_dev_register(drm, 0); + if (ret) + goto err_unload; + + return 0; + +err_unload: + aspeed_gfx_unload(drm); +err_free: + drm_dev_unref(drm); + + return ret; +} + +static int aspeed_gfx_remove(struct platform_device *pdev) +{ + struct drm_device *drm = platform_get_drvdata(pdev); + + drm_dev_unregister(drm); + aspeed_gfx_unload(drm); + drm_dev_unref(drm); + + return 0; +} + +static struct platform_driver aspeed_gfx_platform_driver = { + .probe = aspeed_gfx_probe, + .remove = aspeed_gfx_remove, + .driver = { + .name = "aspeed_gfx", + .of_match_table = aspeed_gfx_match, + }, +}; + +module_platform_driver(aspeed_gfx_platform_driver); + +MODULE_AUTHOR("Joel Stanley <joel@jms.id.au>"); +MODULE_DESCRIPTION("ASPEED BMC DRM/KMS driver"); +MODULE_LICENSE("GPL"); diff --git a/drivers/gpu/drm/aspeed/aspeed_gfx_out.c b/drivers/gpu/drm/aspeed/aspeed_gfx_out.c new file mode 100644 index 000000000000..aee30ff05467 --- /dev/null +++ b/drivers/gpu/drm/aspeed/aspeed_gfx_out.c @@ -0,0 +1,48 @@ +// SPDX-License-Identifier: GPL-2.0+ +// Copyright 2018 IBM Corporation + +#include <drm/drmP.h> +#include <drm/drm_connector.h> +#include <drm/drm_atomic_helper.h> +#include <drm/drm_crtc_helper.h> + +#include "aspeed_gfx.h" + +static int aspeed_gfx_get_modes(struct drm_connector *connector) +{ + return drm_add_modes_noedid(connector, 800, 600); +} + +static const struct +drm_connector_helper_funcs aspeed_gfx_connector_helper_funcs = { + .get_modes = aspeed_gfx_get_modes, +}; + +static void aspeed_gfx_connector_destroy(struct drm_connector *connector) +{ + drm_connector_unregister(connector); + drm_connector_cleanup(connector); +} + +static const struct drm_connector_funcs aspeed_gfx_connector_funcs = { + .fill_modes = drm_helper_probe_single_connector_modes, + .destroy = aspeed_gfx_connector_destroy, + .reset = drm_atomic_helper_connector_reset, + .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, + .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, +}; + +int aspeed_gfx_create_output(struct drm_device *drm) +{ + struct aspeed_gfx *priv = drm->dev_private; + int ret; + + priv->connector.dpms = DRM_MODE_DPMS_OFF; + priv->connector.polled = 0; + drm_connector_helper_add(&priv->connector, + &aspeed_gfx_connector_helper_funcs); + ret = drm_connector_init(drm, &priv->connector, + &aspeed_gfx_connector_funcs, + DRM_MODE_CONNECTOR_Unknown); + return ret; +}
This driver is for the ASPEED BMC SoC's GFX display hardware. This driver runs on the ARM based BMC systems, unlike the ast driver which runs on a host CPU and is is for a PCIe graphics device that happens to live in the BMC's silicon, but is otherwise available for use by the BMC. The AST2500 supports a total of 3 output paths: 1. VGA output (aka host PCIe graphics device), the output target can choose either or both to the DAC or DVO interface. 2. Graphics CRT output, the output target can choose either or both to the DAC or DVO interface. 3. Video input from DVO, the video input can be used for video engine capture or DAC display output. Output options for are selected in SCU2C. This must be toggled by the BMC in order to select between the host and BMC's display output. The "VGA mode" device is the PCI attached controller. The "Graphics CRT" is the BMC's internal display controller. This driver only supports a simple configuration consisting of a 40MHz pixel clock (fixed by hardware limitations) and the VGA output path. Signed-off-by: Joel Stanley <joel@jms.id.au> --- Hello! This driver is working on hardware, with a few oddities. The things that I know need cleaning up are: - clocks: The device can source a clock from three different sources, but they depend on the configuration of other devices in the system (the USB PHY and the 'host' display controller). For this reason we limit the driver to the 40MHz pixel clock that comes from the USB PHY. - Setting an initial mode. I can only get the system to output when running X. fbset and fb-test can't seem to do this on their own. The system this is being developed for intends to run a simple fbterm based application, so this needs fixing. I wanted to get feedback on the way the driver is structured, and if possible a some advice on why fb tools can't set a mode themselves. I'm also lurking in #drm-devel as 'shenki'. Cheers, Joel drivers/gpu/drm/Kconfig | 2 + drivers/gpu/drm/Makefile | 1 + drivers/gpu/drm/aspeed/Kconfig | 15 ++ drivers/gpu/drm/aspeed/Makefile | 3 + drivers/gpu/drm/aspeed/aspeed_gfx.h | 104 ++++++++ drivers/gpu/drm/aspeed/aspeed_gfx_crtc.c | 215 ++++++++++++++++ drivers/gpu/drm/aspeed/aspeed_gfx_drv.c | 301 +++++++++++++++++++++++ drivers/gpu/drm/aspeed/aspeed_gfx_out.c | 48 ++++ 8 files changed, 689 insertions(+) create mode 100644 drivers/gpu/drm/aspeed/Kconfig create mode 100644 drivers/gpu/drm/aspeed/Makefile create mode 100644 drivers/gpu/drm/aspeed/aspeed_gfx.h create mode 100644 drivers/gpu/drm/aspeed/aspeed_gfx_crtc.c create mode 100644 drivers/gpu/drm/aspeed/aspeed_gfx_drv.c create mode 100644 drivers/gpu/drm/aspeed/aspeed_gfx_out.c