| Message ID | db3e80b445df661ff0cd7e698507a8d24a4c867e.1657294931.git.geert@linux-m68k.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | drm: Add support for low-color frame buffer formats | expand |
Hi Am 08.07.22 um 20:20 schrieb Geert Uytterhoeven: > Add support for color-indexed frame buffer formats with two, four, and > sixteen colors to the DRM framebuffer helper functions: > 1. Add support for 1, 2, and 4 bits per pixel to the damage helper, > 2. For color-indexed modes, the length of the color bitfields must be > set to the color depth, else the logo code may pick a logo with too > many colors. Drop the incorrect DAC width comment, which > originates from the i915 driver. > 3. Accept C[124] modes when validating or filling in struct > fb_var_screeninfo, and use the correct number of bits per pixel. > 4. Set the visual to FB_VISUAL_PSEUDOCOLOR for all color-indexed > modes. > > Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> > Reviewed-by: Javier Martinez Canillas <javierm@redhat.com> > --- > If "[PATCH] drm/fb-helper: Remove helpers to change frame buffer > config"[1] is accepted, the changes to drm_fb_helper_check_var() can > just be removed. > > v3: > - Fix FB_VISUAL_TRUECOLOR, > - Add Reviewed-by, > > v2: > - Use drm_format_info_bpp() helper instead of deprecated .depth field > or format-dependent calculations, > - Use new .is_color_indexed field instead of checking against a list > of formats. > > [1] Link: https://lore.kernel.org/r/20220629105658.1373770-1-geert@linux-m68k.org > --- > drivers/gpu/drm/drm_fb_helper.c | 101 ++++++++++++++++++++++++-------- > 1 file changed, 75 insertions(+), 26 deletions(-) > > diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c > index 1705e8d345aba50a..5098efb374fe64ed 100644 > --- a/drivers/gpu/drm/drm_fb_helper.c > +++ b/drivers/gpu/drm/drm_fb_helper.c > @@ -376,12 +376,31 @@ static void drm_fb_helper_damage_blit_real(struct drm_fb_helper *fb_helper, > struct iosys_map *dst) > { > struct drm_framebuffer *fb = fb_helper->fb; > - unsigned int cpp = fb->format->cpp[0]; > - size_t offset = clip->y1 * fb->pitches[0] + clip->x1 * cpp; > - void *src = fb_helper->fbdev->screen_buffer + offset; > - size_t len = (clip->x2 - clip->x1) * cpp; > + size_t offset = clip->y1 * fb->pitches[0]; > + size_t len = clip->x2 - clip->x1; drm_rect_width() please. > unsigned int y; > + void *src; > > + switch (drm_format_info_bpp(fb->format, 0)) { > + case 1: > + offset += clip->x1 / 8; > + len = DIV_ROUND_UP(len + clip->x1 % 8, 8); > + break; > + case 2: > + offset += clip->x1 / 4; > + len = DIV_ROUND_UP(len + clip->x1 % 4, 4); > + break; > + case 4: > + offset += clip->x1 / 2; > + len = DIV_ROUND_UP(len + clip->x1 % 2, 2); > + break; > + default: > + offset += clip->x1 * fb->format->cpp[0]; > + len *= fb->format->cpp[0]; > + break; > + } > + > + src = fb_helper->fbdev->screen_buffer + offset; > iosys_map_incr(dst, offset); /* go to first pixel within clip rect */ > > for (y = clip->y1; y < clip->y2; y++) { > @@ -1273,19 +1292,23 @@ static bool drm_fb_pixel_format_equal(const struct fb_var_screeninfo *var_1, > } > > static void drm_fb_helper_fill_pixel_fmt(struct fb_var_screeninfo *var, > - u8 depth) > + const struct drm_format_info *format) > { > - switch (depth) { > - case 8: > + u8 depth = format->depth; > + > + if (format->is_color_indexed) { > var->red.offset = 0; > var->green.offset = 0; > var->blue.offset = 0; > - var->red.length = 8; /* 8bit DAC */ > - var->green.length = 8; > - var->blue.length = 8; > + var->red.length = depth; > + var->green.length = depth; > + var->blue.length = depth; > var->transp.offset = 0; > var->transp.length = 0; > - break; > + return; > + } > + > + switch (depth) { > case 15: > var->red.offset = 10; > var->green.offset = 5; > @@ -1340,7 +1363,9 @@ int drm_fb_helper_check_var(struct fb_var_screeninfo *var, > { > struct drm_fb_helper *fb_helper = info->par; > struct drm_framebuffer *fb = fb_helper->fb; > + const struct drm_format_info *format = fb->format; > struct drm_device *dev = fb_helper->dev; > + unsigned int bpp; > > if (in_dbg_master()) > return -EINVAL; > @@ -1350,22 +1375,33 @@ int drm_fb_helper_check_var(struct fb_var_screeninfo *var, > var->pixclock = 0; > } > > - if ((drm_format_info_block_width(fb->format, 0) > 1) || > - (drm_format_info_block_height(fb->format, 0) > 1)) > - return -EINVAL; > + switch (format->format) { > + case DRM_FORMAT_C1: > + case DRM_FORMAT_C2: > + case DRM_FORMAT_C4: > + /* supported format with sub-byte pixels */ > + break; > + > + default: > + if ((drm_format_info_block_width(format, 0) > 1) || > + (drm_format_info_block_height(format, 0) > 1)) > + return -EINVAL; > + break; > + } > > /* > * Changes struct fb_var_screeninfo are currently not pushed back > * to KMS, hence fail if different settings are requested. > */ > - if (var->bits_per_pixel > fb->format->cpp[0] * 8 || > + bpp = drm_format_info_bpp(format, 0); > + if (var->bits_per_pixel > bpp || > var->xres > fb->width || var->yres > fb->height || > var->xres_virtual > fb->width || var->yres_virtual > fb->height) { > drm_dbg_kms(dev, "fb requested width/height/bpp can't fit in current fb " > "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n", > var->xres, var->yres, var->bits_per_pixel, > var->xres_virtual, var->yres_virtual, > - fb->width, fb->height, fb->format->cpp[0] * 8); > + fb->width, fb->height, bpp); > return -EINVAL; > } > > @@ -1380,13 +1416,13 @@ int drm_fb_helper_check_var(struct fb_var_screeninfo *var, > !var->blue.length && !var->transp.length && > !var->red.msb_right && !var->green.msb_right && > !var->blue.msb_right && !var->transp.msb_right) { > - drm_fb_helper_fill_pixel_fmt(var, fb->format->depth); > + drm_fb_helper_fill_pixel_fmt(var, format); > } > > /* > * Likewise, bits_per_pixel should be rounded up to a supported value. > */ > - var->bits_per_pixel = fb->format->cpp[0] * 8; > + var->bits_per_pixel = bpp; > > /* > * drm fbdev emulation doesn't support changing the pixel format at all, > @@ -1722,11 +1758,11 @@ static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper, > } > > static void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch, > - uint32_t depth) > + bool is_color_indexed) > { > info->fix.type = FB_TYPE_PACKED_PIXELS; > - info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR : > - FB_VISUAL_TRUECOLOR; > + info->fix.visual = is_color_indexed ? FB_VISUAL_PSEUDOCOLOR > + : FB_VISUAL_TRUECOLOR; > info->fix.mmio_start = 0; > info->fix.mmio_len = 0; > info->fix.type_aux = 0; > @@ -1743,19 +1779,31 @@ static void drm_fb_helper_fill_var(struct fb_info *info, > uint32_t fb_width, uint32_t fb_height) > { > struct drm_framebuffer *fb = fb_helper->fb; > + const struct drm_format_info *format = fb->format; > + > + switch (format->format) { > + case DRM_FORMAT_C1: > + case DRM_FORMAT_C2: > + case DRM_FORMAT_C4: > + /* supported format with sub-byte pixels */ > + break; > + > + default: > + WARN_ON((drm_format_info_block_width(format, 0) > 1) || > + (drm_format_info_block_height(format, 0) > 1)); > + break; > + } > > - WARN_ON((drm_format_info_block_width(fb->format, 0) > 1) || > - (drm_format_info_block_height(fb->format, 0) > 1)); > info->pseudo_palette = fb_helper->pseudo_palette; > info->var.xres_virtual = fb->width; > info->var.yres_virtual = fb->height; > - info->var.bits_per_pixel = fb->format->cpp[0] * 8; > + info->var.bits_per_pixel = drm_format_info_bpp(format, 0); > info->var.accel_flags = FB_ACCELF_TEXT; > info->var.xoffset = 0; > info->var.yoffset = 0; > info->var.activate = FB_ACTIVATE_NOW; > > - drm_fb_helper_fill_pixel_fmt(&info->var, fb->format->depth); > + drm_fb_helper_fill_pixel_fmt(&info->var, format); > > info->var.xres = fb_width; > info->var.yres = fb_height; > @@ -1780,7 +1828,8 @@ void drm_fb_helper_fill_info(struct fb_info *info, > { > struct drm_framebuffer *fb = fb_helper->fb; > > - drm_fb_helper_fill_fix(info, fb->pitches[0], fb->format->depth); > + drm_fb_helper_fill_fix(info, fb->pitches[0], > + fb->format->is_color_indexed); > drm_fb_helper_fill_var(info, fb_helper, > sizes->fb_width, sizes->fb_height); >
diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c index 1705e8d345aba50a..5098efb374fe64ed 100644 --- a/drivers/gpu/drm/drm_fb_helper.c +++ b/drivers/gpu/drm/drm_fb_helper.c @@ -376,12 +376,31 @@ static void drm_fb_helper_damage_blit_real(struct drm_fb_helper *fb_helper, struct iosys_map *dst) { struct drm_framebuffer *fb = fb_helper->fb; - unsigned int cpp = fb->format->cpp[0]; - size_t offset = clip->y1 * fb->pitches[0] + clip->x1 * cpp; - void *src = fb_helper->fbdev->screen_buffer + offset; - size_t len = (clip->x2 - clip->x1) * cpp; + size_t offset = clip->y1 * fb->pitches[0]; + size_t len = clip->x2 - clip->x1; unsigned int y; + void *src; + switch (drm_format_info_bpp(fb->format, 0)) { + case 1: + offset += clip->x1 / 8; + len = DIV_ROUND_UP(len + clip->x1 % 8, 8); + break; + case 2: + offset += clip->x1 / 4; + len = DIV_ROUND_UP(len + clip->x1 % 4, 4); + break; + case 4: + offset += clip->x1 / 2; + len = DIV_ROUND_UP(len + clip->x1 % 2, 2); + break; + default: + offset += clip->x1 * fb->format->cpp[0]; + len *= fb->format->cpp[0]; + break; + } + + src = fb_helper->fbdev->screen_buffer + offset; iosys_map_incr(dst, offset); /* go to first pixel within clip rect */ for (y = clip->y1; y < clip->y2; y++) { @@ -1273,19 +1292,23 @@ static bool drm_fb_pixel_format_equal(const struct fb_var_screeninfo *var_1, } static void drm_fb_helper_fill_pixel_fmt(struct fb_var_screeninfo *var, - u8 depth) + const struct drm_format_info *format) { - switch (depth) { - case 8: + u8 depth = format->depth; + + if (format->is_color_indexed) { var->red.offset = 0; var->green.offset = 0; var->blue.offset = 0; - var->red.length = 8; /* 8bit DAC */ - var->green.length = 8; - var->blue.length = 8; + var->red.length = depth; + var->green.length = depth; + var->blue.length = depth; var->transp.offset = 0; var->transp.length = 0; - break; + return; + } + + switch (depth) { case 15: var->red.offset = 10; var->green.offset = 5; @@ -1340,7 +1363,9 @@ int drm_fb_helper_check_var(struct fb_var_screeninfo *var, { struct drm_fb_helper *fb_helper = info->par; struct drm_framebuffer *fb = fb_helper->fb; + const struct drm_format_info *format = fb->format; struct drm_device *dev = fb_helper->dev; + unsigned int bpp; if (in_dbg_master()) return -EINVAL; @@ -1350,22 +1375,33 @@ int drm_fb_helper_check_var(struct fb_var_screeninfo *var, var->pixclock = 0; } - if ((drm_format_info_block_width(fb->format, 0) > 1) || - (drm_format_info_block_height(fb->format, 0) > 1)) - return -EINVAL; + switch (format->format) { + case DRM_FORMAT_C1: + case DRM_FORMAT_C2: + case DRM_FORMAT_C4: + /* supported format with sub-byte pixels */ + break; + + default: + if ((drm_format_info_block_width(format, 0) > 1) || + (drm_format_info_block_height(format, 0) > 1)) + return -EINVAL; + break; + } /* * Changes struct fb_var_screeninfo are currently not pushed back * to KMS, hence fail if different settings are requested. */ - if (var->bits_per_pixel > fb->format->cpp[0] * 8 || + bpp = drm_format_info_bpp(format, 0); + if (var->bits_per_pixel > bpp || var->xres > fb->width || var->yres > fb->height || var->xres_virtual > fb->width || var->yres_virtual > fb->height) { drm_dbg_kms(dev, "fb requested width/height/bpp can't fit in current fb " "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n", var->xres, var->yres, var->bits_per_pixel, var->xres_virtual, var->yres_virtual, - fb->width, fb->height, fb->format->cpp[0] * 8); + fb->width, fb->height, bpp); return -EINVAL; } @@ -1380,13 +1416,13 @@ int drm_fb_helper_check_var(struct fb_var_screeninfo *var, !var->blue.length && !var->transp.length && !var->red.msb_right && !var->green.msb_right && !var->blue.msb_right && !var->transp.msb_right) { - drm_fb_helper_fill_pixel_fmt(var, fb->format->depth); + drm_fb_helper_fill_pixel_fmt(var, format); } /* * Likewise, bits_per_pixel should be rounded up to a supported value. */ - var->bits_per_pixel = fb->format->cpp[0] * 8; + var->bits_per_pixel = bpp; /* * drm fbdev emulation doesn't support changing the pixel format at all, @@ -1722,11 +1758,11 @@ static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper, } static void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch, - uint32_t depth) + bool is_color_indexed) { info->fix.type = FB_TYPE_PACKED_PIXELS; - info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR : - FB_VISUAL_TRUECOLOR; + info->fix.visual = is_color_indexed ? FB_VISUAL_PSEUDOCOLOR + : FB_VISUAL_TRUECOLOR; info->fix.mmio_start = 0; info->fix.mmio_len = 0; info->fix.type_aux = 0; @@ -1743,19 +1779,31 @@ static void drm_fb_helper_fill_var(struct fb_info *info, uint32_t fb_width, uint32_t fb_height) { struct drm_framebuffer *fb = fb_helper->fb; + const struct drm_format_info *format = fb->format; + + switch (format->format) { + case DRM_FORMAT_C1: + case DRM_FORMAT_C2: + case DRM_FORMAT_C4: + /* supported format with sub-byte pixels */ + break; + + default: + WARN_ON((drm_format_info_block_width(format, 0) > 1) || + (drm_format_info_block_height(format, 0) > 1)); + break; + } - WARN_ON((drm_format_info_block_width(fb->format, 0) > 1) || - (drm_format_info_block_height(fb->format, 0) > 1)); info->pseudo_palette = fb_helper->pseudo_palette; info->var.xres_virtual = fb->width; info->var.yres_virtual = fb->height; - info->var.bits_per_pixel = fb->format->cpp[0] * 8; + info->var.bits_per_pixel = drm_format_info_bpp(format, 0); info->var.accel_flags = FB_ACCELF_TEXT; info->var.xoffset = 0; info->var.yoffset = 0; info->var.activate = FB_ACTIVATE_NOW; - drm_fb_helper_fill_pixel_fmt(&info->var, fb->format->depth); + drm_fb_helper_fill_pixel_fmt(&info->var, format); info->var.xres = fb_width; info->var.yres = fb_height; @@ -1780,7 +1828,8 @@ void drm_fb_helper_fill_info(struct fb_info *info, { struct drm_framebuffer *fb = fb_helper->fb; - drm_fb_helper_fill_fix(info, fb->pitches[0], fb->format->depth); + drm_fb_helper_fill_fix(info, fb->pitches[0], + fb->format->is_color_indexed); drm_fb_helper_fill_var(info, fb_helper, sizes->fb_width, sizes->fb_height);
Add support for color-indexed frame buffer formats with two, four, and sixteen colors to the DRM framebuffer helper functions: 1. Add support for 1, 2, and 4 bits per pixel to the damage helper, 2. For color-indexed modes, the length of the color bitfields must be set to the color depth, else the logo code may pick a logo with too many colors. Drop the incorrect DAC width comment, which originates from the i915 driver. 3. Accept C[124] modes when validating or filling in struct fb_var_screeninfo, and use the correct number of bits per pixel. 4. Set the visual to FB_VISUAL_PSEUDOCOLOR for all color-indexed modes. Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Reviewed-by: Javier Martinez Canillas <javierm@redhat.com> --- If "[PATCH] drm/fb-helper: Remove helpers to change frame buffer config"[1] is accepted, the changes to drm_fb_helper_check_var() can just be removed. v3: - Fix FB_VISUAL_TRUECOLOR, - Add Reviewed-by, v2: - Use drm_format_info_bpp() helper instead of deprecated .depth field or format-dependent calculations, - Use new .is_color_indexed field instead of checking against a list of formats. [1] Link: https://lore.kernel.org/r/20220629105658.1373770-1-geert@linux-m68k.org --- drivers/gpu/drm/drm_fb_helper.c | 101 ++++++++++++++++++++++++-------- 1 file changed, 75 insertions(+), 26 deletions(-)