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From: Yakir Yang <ykk@rock-chips.com>
To: Inki Dae <inki.dae@samsung.com>, Mark Yao <mark.yao@rock-chips.com>,
	Jingoo Han <jingoohan1@gmail.com>, Heiko Stuebner <heiko@sntech.de>
Subject: [PATCH v11 07/19] drm: rockchip: dp: add rockchip platform dp driver
Date: Wed, 16 Dec 2015 11:36:40 +0800
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Cc: devicetree@vger.kernel.org, Krzysztof Kozlowski <k.kozlowski@samsung.com>,
	linux-samsung-soc@vger.kernel.org,
	Russell King <linux@arm.linux.org.uk>,
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	Kishon Vijay Abraham I <kishon@ti.com>, javier@osg.samsung.com,
	Rob Herring <robh+dt@kernel.org>, Yakir Yang <ykk@rock-chips.com>,
	Andy Yan <andy.yan@rock-chips.com>, Thierry Reding <treding@nvidia.com>,
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Rockchip have three clocks for dp controller, we leave pclk_edp
to analogix_dp driver control, and keep the sclk_edp_24m and
sclk_edp in platform driver.

Signed-off-by: Yakir Yang <ykk@rock-chips.com>
Tested-by: Javier Martinez Canillas <javier@osg.samsung.com>
---
Changes in v11: None
Changes in v10:
- Correct the ROCKCHIP_ANALOGIX_DP indentation in Kconfig to tabs here (Heiko)

Changes in v9: None
Changes in v8: None
Changes in v7: None
Changes in v6: None
Changes in v5:
- Remove the empty line at the end of document, and correct the endpoint
  numbers in the example DT node, and remove the regulator iomux setting
  in driver code while using the pinctl in devicetree instead. (Heiko)
- Add device type declared, cause the previous "platform device type
  support (v4 11/16)" already merge into (v5 02/14).
- Implement connector registration code. (Thierry)

Changes in v4:
- Remove some deprecated DT properties in rockchip dp document.

Changes in v3:
- Leave "sclk_edp_24m" to rockchip dp phy driver which name to "24m",
  and leave "sclk_edp" to analogix dp core driver which name to "dp",
  and leave "pclk_edp" to rockchip dp platform driver which name to
  "pclk". (Thierry & Heiko)
- Add devicetree binding document. (Heiko)
- Remove "rockchip,panel" DT property, take use of remote point to get panel
  node. (Heiko)
- Add the new function point dp_platdata->get_modes() init.

Changes in v2:
- Get panel node with remote-endpoint method, and create devicetree binding
  for driver. (Heiko)
- Remove the clock enable/disbale with "sclk_edp" & "sclk_edp_24m",
  leave those clock to rockchip dp phy driver.

 drivers/gpu/drm/rockchip/Kconfig                |   9 +
 drivers/gpu/drm/rockchip/Makefile               |   1 +
 drivers/gpu/drm/rockchip/analogix_dp-rockchip.c | 442 ++++++++++++++++++++++++
 include/drm/bridge/analogix_dp.h                |   1 +
 4 files changed, 453 insertions(+)
 create mode 100644 drivers/gpu/drm/rockchip/analogix_dp-rockchip.c

diff --git a/drivers/gpu/drm/rockchip/Kconfig b/drivers/gpu/drm/rockchip/Kconfig
index 35215f6..686cb49 100644
--- a/drivers/gpu/drm/rockchip/Kconfig
+++ b/drivers/gpu/drm/rockchip/Kconfig
@@ -25,3 +25,12 @@ config ROCKCHIP_DW_HDMI
 	  for the Synopsys DesignWare HDMI driver. If you want to
 	  enable HDMI on RK3288 based SoC, you should selet this
 	  option.
+
+config ROCKCHIP_ANALOGIX_DP
+	tristate "Rockchip specific extensions for Analogix DP driver"
+	depends on DRM_ROCKCHIP
+	select DRM_ANALOGIX_DP
+	help
+	  This selects support for Rockchip SoC specific extensions
+	  for the Analogix Core DP driver. If you want to enable DP
+	  on RK3288 based SoC, you should selet this option.
diff --git a/drivers/gpu/drm/rockchip/Makefile b/drivers/gpu/drm/rockchip/Makefile
index f3d8a19..8ad01fb 100644
--- a/drivers/gpu/drm/rockchip/Makefile
+++ b/drivers/gpu/drm/rockchip/Makefile
@@ -6,5 +6,6 @@ rockchipdrm-y := rockchip_drm_drv.o rockchip_drm_fb.o rockchip_drm_fbdev.o \
 		rockchip_drm_gem.o
 
 obj-$(CONFIG_ROCKCHIP_DW_HDMI) += dw_hdmi-rockchip.o
+obj-$(CONFIG_ROCKCHIP_ANALOGIX_DP) += analogix_dp-rockchip.o
 
 obj-$(CONFIG_DRM_ROCKCHIP) += rockchipdrm.o rockchip_drm_vop.o
diff --git a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
new file mode 100644
index 0000000..2c82a9a
--- /dev/null
+++ b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
@@ -0,0 +1,442 @@
+/*
+ * Rockchip SoC DP (Display Port) interface driver.
+ *
+ * Copyright (C) Fuzhou Rockchip Electronics Co., Ltd.
+ * Author: Andy Yan <andy.yan@rock-chips.com>
+ *         Yakir Yang <ykk@rock-chips.com>
+ *         Jeff Chen <jeff.chen@rock-chips.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ */
+
+#include <linux/component.h>
+#include <linux/mfd/syscon.h>
+#include <linux/of_graph.h>
+#include <linux/regmap.h>
+#include <linux/reset.h>
+#include <linux/clk.h>
+
+#include <drm/drmP.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_dp_helper.h>
+#include <drm/drm_of.h>
+#include <drm/drm_panel.h>
+
+#include <video/of_videomode.h>
+#include <video/videomode.h>
+
+#include <drm/bridge/analogix_dp.h>
+
+#include "rockchip_drm_drv.h"
+#include "rockchip_drm_vop.h"
+
+#define to_dp(nm)	container_of(nm, struct rockchip_dp_device, nm)
+
+/* dp grf register offset */
+#define GRF_SOC_CON6                            0x025c
+#define GRF_EDP_LCD_SEL_MASK                    BIT(5)
+#define GRF_EDP_SEL_VOP_LIT                     BIT(5)
+#define GRF_EDP_SEL_VOP_BIG                     0
+
+struct rockchip_dp_device {
+	struct drm_device        *drm_dev;
+	struct device            *dev;
+	struct drm_encoder       encoder;
+	struct drm_connector     connector;
+	struct drm_display_mode  mode;
+
+	struct clk               *pclk;
+	struct regmap            *grf;
+	struct reset_control     *rst;
+
+	struct analogix_dp_plat_data plat_data;
+};
+
+static int rockchip_dp_pre_init(struct rockchip_dp_device *dp)
+{
+	reset_control_assert(dp->rst);
+	usleep_range(10, 20);
+	reset_control_deassert(dp->rst);
+
+	return 0;
+}
+
+static int rockchip_dp_poweron(struct analogix_dp_plat_data *plat_data)
+{
+	struct rockchip_dp_device *dp = to_dp(plat_data);
+	int ret;
+
+	ret = clk_prepare_enable(dp->pclk);
+	if (ret < 0) {
+		dev_err(dp->dev, "failed to enable pclk %d\n", ret);
+		return ret;
+	}
+
+	ret = rockchip_dp_pre_init(dp);
+	if (ret < 0) {
+		dev_err(dp->dev, "failed to dp pre init %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int rockchip_dp_powerdown(struct analogix_dp_plat_data *plat_data)
+{
+	struct rockchip_dp_device *dp = to_dp(plat_data);
+
+	clk_disable_unprepare(dp->pclk);
+
+	return 0;
+}
+
+static int rockchip_dp_get_modes(struct drm_connector *connector)
+{
+	struct rockchip_dp_device *dp = to_dp(connector);
+
+	return analogix_dp_get_modes(dp->dev);
+}
+
+static struct drm_encoder *
+rockchip_dp_best_encoder(struct drm_connector *connector)
+{
+	struct rockchip_dp_device *dp = to_dp(connector);
+
+	return &dp->encoder;
+}
+
+static struct drm_connector_helper_funcs rockchip_dp_connector_helper_funcs = {
+	.get_modes = rockchip_dp_get_modes,
+	.best_encoder = rockchip_dp_best_encoder,
+};
+
+static enum drm_connector_status
+rockchip_dp_detect(struct drm_connector *connector, bool force)
+{
+	struct rockchip_dp_device *dp = to_dp(connector);
+
+	return analogix_dp_detect(dp->dev, force);
+}
+
+static void rockchip_dp_connector_destroy(struct drm_connector *connector)
+{
+	drm_connector_unregister(connector);
+	drm_connector_cleanup(connector);
+}
+
+static struct drm_connector_funcs rockchip_dp_connector_funcs = {
+	.dpms = drm_helper_connector_dpms,
+	.fill_modes = drm_helper_probe_single_connector_modes,
+	.detect = rockchip_dp_detect,
+	.destroy = rockchip_dp_connector_destroy,
+};
+
+static int rockchip_dp_bridge_attach(struct analogix_dp_plat_data *plat_data,
+				     struct drm_bridge *bridge)
+{
+	struct rockchip_dp_device *dp = to_dp(plat_data);
+	struct drm_connector *connector = &dp->connector;
+	struct drm_encoder *encoder = &dp->encoder;
+	int ret;
+
+	connector->polled = DRM_CONNECTOR_POLL_HPD;
+
+	ret = drm_connector_init(dp->drm_dev, connector,
+				 &rockchip_dp_connector_funcs,
+				 DRM_MODE_CONNECTOR_eDP);
+	if (ret) {
+		DRM_ERROR("Failed to initialize connector with drm\n");
+		return ret;
+	}
+
+	drm_connector_helper_add(connector,
+				 &rockchip_dp_connector_helper_funcs);
+	drm_mode_connector_attach_encoder(connector, encoder);
+
+	dp->plat_data.connector = connector;
+
+	return 0;
+}
+
+static bool
+rockchip_dp_drm_encoder_mode_fixup(struct drm_encoder *encoder,
+				   const struct drm_display_mode *mode,
+				   struct drm_display_mode *adjusted_mode)
+{
+	/* do nothing */
+	return true;
+}
+
+static void rockchip_dp_drm_encoder_mode_set(struct drm_encoder *encoder,
+					     struct drm_display_mode *mode,
+					     struct drm_display_mode *adjusted)
+{
+	/* do nothing */
+}
+
+static void rockchip_dp_drm_encoder_prepare(struct drm_encoder *encoder)
+{
+	struct rockchip_dp_device *dp = to_dp(encoder);
+	u32 val;
+	int ret;
+
+	ret = rockchip_drm_crtc_mode_config(encoder->crtc,
+					    DRM_MODE_CONNECTOR_eDP,
+					    ROCKCHIP_OUT_MODE_AAAA);
+	if (ret < 0) {
+		dev_err(dp->dev, "Could not set crtc mode config: %d.\n", ret);
+		return;
+	}
+
+	ret = rockchip_drm_encoder_get_mux_id(dp->dev->of_node, encoder);
+	if (ret < 0)
+		return;
+
+	if (ret)
+		val = GRF_EDP_SEL_VOP_LIT | (GRF_EDP_LCD_SEL_MASK << 16);
+	else
+		val = GRF_EDP_SEL_VOP_BIG | (GRF_EDP_LCD_SEL_MASK << 16);
+
+	dev_dbg(dp->dev, "vop %s output to dp\n", (ret) ? "LIT" : "BIG");
+
+	ret = regmap_write(dp->grf, GRF_SOC_CON6, val);
+	if (ret != 0) {
+		dev_err(dp->dev, "Could not write to GRF: %d\n", ret);
+		return;
+	}
+}
+
+static void rockchip_dp_drm_encoder_nop(struct drm_encoder *encoder)
+{
+	/* do nothing */
+}
+
+static struct drm_encoder_helper_funcs rockchip_dp_encoder_helper_funcs = {
+	.mode_fixup = rockchip_dp_drm_encoder_mode_fixup,
+	.mode_set = rockchip_dp_drm_encoder_mode_set,
+	.prepare = rockchip_dp_drm_encoder_prepare,
+	.commit = rockchip_dp_drm_encoder_nop,
+	.disable = rockchip_dp_drm_encoder_nop,
+};
+
+static void rockchip_dp_drm_encoder_destroy(struct drm_encoder *encoder)
+{
+	drm_encoder_cleanup(encoder);
+}
+
+static struct drm_encoder_funcs rockchip_dp_encoder_funcs = {
+	.destroy = rockchip_dp_drm_encoder_destroy,
+};
+
+static int rockchip_dp_init(struct rockchip_dp_device *dp)
+{
+	struct device *dev = dp->dev;
+	struct device_node *np = dev->of_node;
+	int ret;
+
+	dp->grf = syscon_regmap_lookup_by_phandle(np, "rockchip,grf");
+	if (IS_ERR(dp->grf)) {
+		dev_err(dev, "failed to get rockchip,grf property\n");
+		return PTR_ERR(dp->grf);
+	}
+
+	dp->pclk = devm_clk_get(dev, "pclk");
+	if (IS_ERR(dp->pclk)) {
+		dev_err(dev, "failed to get pclk property\n");
+		return PTR_ERR(dp->pclk);
+	}
+
+	dp->rst = devm_reset_control_get(dev, "dp");
+	if (IS_ERR(dp->rst)) {
+		dev_err(dev, "failed to get dp reset control\n");
+		return PTR_ERR(dp->rst);
+	}
+
+	ret = clk_prepare_enable(dp->pclk);
+	if (ret < 0) {
+		dev_err(dp->dev, "failed to enable pclk %d\n", ret);
+		return ret;
+	}
+
+	ret = rockchip_dp_pre_init(dp);
+	if (ret < 0) {
+		dev_err(dp->dev, "failed to pre init %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int rockchip_dp_drm_create_encoder(struct rockchip_dp_device *dp)
+{
+	struct drm_encoder *encoder = &dp->encoder;
+	struct drm_device *drm_dev = dp->drm_dev;
+	struct device *dev = dp->dev;
+	int ret;
+
+	encoder->possible_crtcs = drm_of_find_possible_crtcs(drm_dev,
+							     dev->of_node);
+	DRM_DEBUG_KMS("possible_crtcs = 0x%x\n", encoder->possible_crtcs);
+
+	ret = drm_encoder_init(drm_dev, encoder, &rockchip_dp_encoder_funcs,
+			       DRM_MODE_ENCODER_TMDS);
+	if (ret) {
+		DRM_ERROR("failed to initialize encoder with drm\n");
+		return ret;
+	}
+
+	drm_encoder_helper_add(encoder, &rockchip_dp_encoder_helper_funcs);
+
+	return 0;
+}
+
+static int rockchip_dp_bind(struct device *dev, struct device *master,
+			    void *data)
+{
+	struct rockchip_dp_device *dp = dev_get_drvdata(dev);
+	struct drm_device *drm_dev = data;
+	int ret;
+
+	/*
+	 * Just like the probe function said, we don't need the
+	 * device drvrate anymore, we should leave the charge to
+	 * analogix dp driver, set the device drvdata to NULL.
+	 */
+	dev_set_drvdata(dev, NULL);
+
+	ret = rockchip_dp_init(dp);
+	if (ret < 0)
+		return ret;
+
+	dp->drm_dev = drm_dev;
+
+	ret = rockchip_dp_drm_create_encoder(dp);
+	if (ret) {
+		DRM_ERROR("failed to create drm encoder\n");
+		return ret;
+	}
+
+	dp->plat_data.encoder = &dp->encoder;
+
+	dp->plat_data.dev_type = RK3288_DP;
+	dp->plat_data.power_on = rockchip_dp_poweron;
+	dp->plat_data.power_off = rockchip_dp_powerdown;
+	dp->plat_data.attach = rockchip_dp_bridge_attach;
+
+	return analogix_dp_bind(dev, dp->drm_dev, &dp->plat_data);
+}
+
+static void rockchip_dp_unbind(struct device *dev, struct device *master,
+			       void *data)
+{
+	return analogix_dp_unbind(dev, master, data);
+}
+
+static const struct component_ops rockchip_dp_component_ops = {
+	.bind = rockchip_dp_bind,
+	.unbind = rockchip_dp_unbind,
+};
+
+static int rockchip_dp_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct device_node *panel_node, *port, *endpoint;
+	struct rockchip_dp_device *dp;
+	struct drm_panel *panel;
+
+	port = of_graph_get_port_by_id(dev->of_node, 1);
+	if (!port) {
+		dev_err(dev, "can't find output port\n");
+		return -EINVAL;
+	}
+
+	endpoint = of_get_child_by_name(port, "endpoint");
+	of_node_put(port);
+	if (!endpoint) {
+		dev_err(dev, "no output endpoint found\n");
+		return -EINVAL;
+	}
+
+	panel_node = of_graph_get_remote_port_parent(endpoint);
+	of_node_put(endpoint);
+	if (!panel_node) {
+		dev_err(dev, "no output node found\n");
+		return -EINVAL;
+	}
+
+	panel = of_drm_find_panel(panel_node);
+	if (!panel) {
+		DRM_ERROR("failed to find panel\n");
+		of_node_put(panel_node);
+		return -EPROBE_DEFER;
+	}
+
+	of_node_put(panel_node);
+
+	dp = devm_kzalloc(dev, sizeof(*dp), GFP_KERNEL);
+	if (!dp)
+		return -ENOMEM;
+
+	dp->dev = dev;
+
+	dp->plat_data.panel = panel;
+
+	/*
+	 * We just use the drvdata until driver run into component
+	 * add function, and then we would set drvdata to null, so
+	 * that analogix dp driver could take charge of the drvdata.
+	 */
+	platform_set_drvdata(pdev, dp);
+
+	return component_add(dev, &rockchip_dp_component_ops);
+}
+
+static int rockchip_dp_remove(struct platform_device *pdev)
+{
+	component_del(&pdev->dev, &rockchip_dp_component_ops);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int rockchip_dp_suspend(struct device *dev)
+{
+	return analogix_dp_suspend(dev);
+}
+
+static int rockchip_dp_resume(struct device *dev)
+{
+	return analogix_dp_resume(dev);
+}
+#endif
+
+static const struct dev_pm_ops rockchip_dp_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(rockchip_dp_suspend, rockchip_dp_resume)
+};
+
+static const struct of_device_id rockchip_dp_dt_ids[] = {
+	{.compatible = "rockchip,rk3288-dp",},
+	{}
+};
+MODULE_DEVICE_TABLE(of, rockchip_dp_dt_ids);
+
+static struct platform_driver rockchip_dp_driver = {
+	.probe = rockchip_dp_probe,
+	.remove = rockchip_dp_remove,
+	.driver = {
+		   .name = "rockchip-dp",
+		   .owner = THIS_MODULE,
+		   .pm = &rockchip_dp_pm_ops,
+		   .of_match_table = of_match_ptr(rockchip_dp_dt_ids),
+	},
+};
+
+module_platform_driver(rockchip_dp_driver);
+
+MODULE_AUTHOR("Yakir Yang <ykk@rock-chips.com>");
+MODULE_AUTHOR("Jeff chen <jeff.chen@rock-chips.com>");
+MODULE_DESCRIPTION("Rockchip Specific Analogix-DP Driver Extension");
+MODULE_LICENSE("GPL v2");
diff --git a/include/drm/bridge/analogix_dp.h b/include/drm/bridge/analogix_dp.h
index 134638af..7d9857a 100644
--- a/include/drm/bridge/analogix_dp.h
+++ b/include/drm/bridge/analogix_dp.h
@@ -15,6 +15,7 @@
 
 enum analogix_dp_devtype {
 	EXYNOS_DP,
+	RK3288_DP,
 };
 
 struct analogix_dp_plat_data {