drm/exynos: Move display implementation into dp

This patch moves the exynos_drm_display implementation from fimd into
the dp driver. This will allow for tighter integration of the dp driver
into the exynos drm driver.

Signed-off-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

Documentation/devicetree/bindings/video/exynos_dp.txt

@@ -49,6 +49,8 @@ Required properties for dp-controller:
 	-samsung,lane-count:
 		number of lanes supported by the panel.
 			LANE_COUNT1 = 1, LANE_COUNT2 = 2, LANE_COUNT4 = 4
+	- display-timings: timings for the connected panel as described by
+		Documentation/devicetree/bindings/video/display-timing.txt
 
 Optional properties for dp-controller:
 	-interlaced:
@@ -84,4 +86,19 @@ Board Specific portion:
 		samsung,color-depth = <1>;
 		samsung,link-rate = <0x0a>;
 		samsung,lane-count = <4>;
+
+		display-timings {
+			native-mode = <&lcd_timing>;
+			lcd_timing: 1366x768 {
+				clock-frequency = <70589280>;
+				hactive = <1366>;
+				vactive = <768>;
+				hfront-porch = <40>;
+				hback-porch = <40>;
+				hsync-len = <32>;
+				vback-porch = <10>;
+				vfront-porch = <12>;
+				vsync-len = <6>;
+			};
+		};
 	};

Documentation/devicetree/bindings/video/samsung-fimd.txt

@@ -39,6 +39,8 @@ Required properties:
 
 Optional Properties:
 - samsung,power-domain: a phandle to FIMD power domain node.
+- samsung,invert-vden: video enable signal is inverted
+- samsung,invert-vclk: video clock signal is inverted
 
 Example:
 

drivers/gpu/drm/exynos/exynos_dp_core.c

@@ -19,7 +19,12 @@
 #include <linux/delay.h>
 #include <linux/of.h>
 #include <linux/phy/phy.h>
+#include <video/of_display_timing.h>
+#include <video/of_videomode.h>
 
+#include <drm/drmP.h>
+
+#include "exynos_drm_drv.h"
 #include "exynos_dp_core.h"
 
 static int exynos_dp_init_dp(struct exynos_dp_device *dp)
@@ -892,6 +897,35 @@ static void exynos_dp_hotplug(struct work_struct *work)
 		dev_err(dp->dev, "unable to config video\n");
 }
 
+static bool exynos_dp_display_is_connected(struct exynos_drm_display *display)
+{
+	return true;
+}
+
+static void *exynos_dp_get_panel(struct exynos_drm_display *display)
+{
+	struct exynos_dp_device *dp = display->ctx;
+
+	return &dp->panel;
+}
+
+static int exynos_dp_check_mode(struct exynos_drm_display *display,
+			struct drm_display_mode *mode)
+{
+	return 0;
+}
+
+static struct exynos_drm_display_ops exynos_dp_display_ops = {
+	.is_connected = exynos_dp_display_is_connected,
+	.get_panel = exynos_dp_get_panel,
+	.check_mode = exynos_dp_check_mode,
+};
+
+static struct exynos_drm_display exynos_dp_display = {
+	.type = EXYNOS_DISPLAY_TYPE_LCD,
+	.ops = &exynos_dp_display_ops,
+};
+
 static struct video_info *exynos_dp_dt_parse_pdata(struct device *dev)
 {
 	struct device_node *dp_node = dev->of_node;
@@ -993,6 +1027,19 @@ static int exynos_dp_dt_parse_phydata(struct exynos_dp_device *dp)
 	return ret;
 }
 
+static int exynos_dp_dt_parse_panel(struct exynos_dp_device *dp)
+{
+	int ret;
+
+	ret = of_get_videomode(dp->dev->of_node, &dp->panel.vm,
+			OF_USE_NATIVE_MODE);
+	if (ret) {
+		DRM_ERROR("failed: of_get_videomode() : %d\n", ret);
+		return ret;
+	}
+	return 0;
+}
+
 static void exynos_dp_phy_init(struct exynos_dp_device *dp)
 {
 	if (dp->phy) {
@@ -1019,6 +1066,28 @@ static void exynos_dp_phy_exit(struct exynos_dp_device *dp)
 	}
 }
 
+void exynos_dp_poweron(struct exynos_dp_device *dp)
+{
+	exynos_dp_phy_init(dp);
+
+	clk_prepare_enable(dp->clock);
+
+	exynos_dp_init_dp(dp);
+
+	enable_irq(dp->irq);
+}
+
+void exynos_dp_poweroff(struct exynos_dp_device *dp)
+{
+	disable_irq(dp->irq);
+
+	flush_work(&dp->hotplug_work);
+
+	exynos_dp_phy_exit(dp);
+
+	clk_disable_unprepare(dp->clock);
+}
+
 static int exynos_dp_probe(struct platform_device *pdev)
 {
 	struct resource *res;
@@ -1043,6 +1112,10 @@ static int exynos_dp_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
+	ret = exynos_dp_dt_parse_panel(dp);
+	if (ret)
+		return ret;
+
 	dp->clock = devm_clk_get(&pdev->dev, "dp");
 	if (IS_ERR(dp->clock)) {
 		dev_err(&pdev->dev, "failed to get clock\n");
@@ -1078,6 +1151,9 @@ static int exynos_dp_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, dp);
 
+	exynos_dp_display.ctx = dp;
+	exynos_drm_display_register(&exynos_dp_display);
+
 	return 0;
 }
 
@@ -1085,6 +1161,8 @@ static int exynos_dp_remove(struct platform_device *pdev)
 {
 	struct exynos_dp_device *dp = platform_get_drvdata(pdev);
 
+	exynos_drm_display_unregister(&exynos_dp_display);
+
 	flush_work(&dp->hotplug_work);
 
 	exynos_dp_phy_exit(dp);
@@ -1100,14 +1178,7 @@ static int exynos_dp_suspend(struct device *dev)
 {
 	struct exynos_dp_device *dp = dev_get_drvdata(dev);
 
-	disable_irq(dp->irq);
-
-	flush_work(&dp->hotplug_work);
-
-	exynos_dp_phy_exit(dp);
-
-	clk_disable_unprepare(dp->clock);
-
+	exynos_dp_poweroff(dp);
 	return 0;
 }
 
@@ -1115,14 +1186,7 @@ static int exynos_dp_resume(struct device *dev)
 {
 	struct exynos_dp_device *dp = dev_get_drvdata(dev);
 
-	exynos_dp_phy_init(dp);
-
-	clk_prepare_enable(dp->clock);
-
-	exynos_dp_init_dp(dp);
-
-	enable_irq(dp->irq);
-
+	exynos_dp_poweron(dp);
 	return 0;
 }
 #endif
@@ -1137,7 +1201,7 @@ static const struct of_device_id exynos_dp_match[] = {
 };
 MODULE_DEVICE_TABLE(of, exynos_dp_match);
 
-static struct platform_driver exynos_dp_driver = {
+struct platform_driver dp_driver = {
 	.probe		= exynos_dp_probe,
 	.remove		= exynos_dp_remove,
 	.driver		= {
@@ -1148,8 +1212,6 @@ static struct platform_driver exynos_dp_driver = {
 	},
 };
 
-module_platform_driver(exynos_dp_driver);
-
 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
 MODULE_DESCRIPTION("Samsung SoC DP Driver");
 MODULE_LICENSE("GPL");

drivers/gpu/drm/exynos/exynos_dp_core.h

@@ -13,6 +13,8 @@
 #ifndef _EXYNOS_DP_CORE_H
 #define _EXYNOS_DP_CORE_H
 
+#include <drm/exynos_drm.h>
+
 #define DP_TIMEOUT_LOOP_COUNT 100
 #define MAX_CR_LOOP 5
 #define MAX_EQ_LOOP 5
@@ -152,6 +154,8 @@ struct exynos_dp_device {
 	struct link_train	link_train;
 	struct work_struct	hotplug_work;
 	struct phy		*phy;
+
+	struct exynos_drm_panel_info panel;
 };
 
 /* exynos_dp_reg.c */

drivers/gpu/drm/exynos/exynos_drm_drv.c

@@ -357,6 +357,12 @@ static int __init exynos_drm_init(void)
 {
 	int ret;
 
+#ifdef CONFIG_DRM_EXYNOS_DP
+	ret = platform_driver_register(&dp_driver);
+	if (ret < 0)
+		goto out_dp;
+#endif
+
 #ifdef CONFIG_DRM_EXYNOS_FIMD
 	ret = platform_driver_register(&fimd_driver);
 	if (ret < 0)
@@ -471,6 +477,10 @@ static int __init exynos_drm_init(void)
 #ifdef CONFIG_DRM_EXYNOS_FIMD
 	platform_driver_unregister(&fimd_driver);
 out_fimd:
+#endif
+#ifdef CONFIG_DRM_EXYNOS_DP
+	platform_driver_unregister(&dp_driver);
+out_dp:
 #endif
 	return ret;
 }
@@ -514,6 +524,10 @@ static void __exit exynos_drm_exit(void)
 #ifdef CONFIG_DRM_EXYNOS_FIMD
 	platform_driver_unregister(&fimd_driver);
 #endif
+
+#ifdef CONFIG_DRM_EXYNOS_DP
+	platform_driver_unregister(&dp_driver);
+#endif
 }
 
 module_init(exynos_drm_init);

drivers/gpu/drm/exynos/exynos_drm_drv.h

@@ -370,6 +370,7 @@ int exynos_platform_device_ipp_register(void);
  */
 void exynos_platform_device_ipp_unregister(void);
 
+extern struct platform_driver dp_driver;
 extern struct platform_driver fimd_driver;
 extern struct platform_driver hdmi_driver;
 extern struct platform_driver mixer_driver;

drivers/gpu/drm/exynos/exynos_drm_fimd.c

@@ -144,39 +144,6 @@ static inline struct fimd_driver_data *drm_fimd_get_driver_data(
 	return (struct fimd_driver_data *)of_id->data;
 }
 
-static bool fimd_display_is_connected(struct exynos_drm_display *display)
-{
-	/* TODO. */
-
-	return true;
-}
-
-static void *fimd_get_panel(struct exynos_drm_display *display)
-{
-	struct fimd_context *ctx = display->ctx;
-
-	return &ctx->panel;
-}
-
-static int fimd_check_mode(struct exynos_drm_display *display,
-			struct drm_display_mode *mode)
-{
-	/* TODO. */
-
-	return 0;
-}
-
-static struct exynos_drm_display_ops fimd_display_ops = {
-	.is_connected = fimd_display_is_connected,
-	.get_panel = fimd_get_panel,
-	.check_mode = fimd_check_mode,
-};
-
-static struct exynos_drm_display fimd_display = {
-	.type = EXYNOS_DISPLAY_TYPE_LCD,
-	.ops = &fimd_display_ops,
-};
-
 static int fimd_mgr_initialize(struct exynos_drm_manager *mgr,
 			struct drm_device *drm_dev, int pipe)
 {
@@ -253,7 +220,7 @@ static void fimd_commit(struct exynos_drm_manager *mgr)
 	struct fimd_context *ctx = mgr->ctx;
 	struct drm_display_mode *mode = &ctx->mode;
 	struct fimd_driver_data *driver_data;
-	u32 val, clkdiv;
+	u32 val, clkdiv, vidcon1;
 	int hblank, vblank, vsync_len, vbpd, vfpd, hsync_len, hbpd, hfpd;
 
 	driver_data = ctx->driver_data;
@@ -264,8 +231,13 @@ static void fimd_commit(struct exynos_drm_manager *mgr)
 	if (mode->htotal == 0 || mode->vtotal == 0)
 		return;
 
-	/* setup polarity values from machine code. */
-	writel(ctx->vidcon1, ctx->regs + driver_data->timing_base + VIDCON1);
+	/* setup polarity values */
+	vidcon1 = ctx->vidcon1;
+	if (mode->flags & DRM_MODE_FLAG_NVSYNC)
+		vidcon1 |= VIDCON1_INV_VSYNC;
+	if (mode->flags & DRM_MODE_FLAG_NHSYNC)
+		vidcon1 |= VIDCON1_INV_HSYNC;
+	writel(vidcon1, ctx->regs + driver_data->timing_base + VIDCON1);
 
 	/* setup vertical timing values. */
 	vblank = mode->crtc_vblank_end - mode->crtc_vblank_start;
@@ -871,30 +843,6 @@ static int fimd_activate(struct exynos_drm_manager *mgr, bool enable)
 	return 0;
 }
 
-static int fimd_get_platform_data(struct fimd_context *ctx, struct device *dev)
-{
-	struct videomode *vm;
-	int ret;
-
-	vm = &ctx->panel.vm;
-	ret = of_get_videomode(dev->of_node, vm, OF_USE_NATIVE_MODE);
-	if (ret) {
-		DRM_ERROR("failed: of_get_videomode() : %d\n", ret);
-		return ret;
-	}
-
-	if (vm->flags & DISPLAY_FLAGS_VSYNC_LOW)
-		ctx->vidcon1 |= VIDCON1_INV_VSYNC;
-	if (vm->flags & DISPLAY_FLAGS_HSYNC_LOW)
-		ctx->vidcon1 |= VIDCON1_INV_HSYNC;
-	if (vm->flags & DISPLAY_FLAGS_DE_LOW)
-		ctx->vidcon1 |= VIDCON1_INV_VDEN;
-	if (vm->flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE)
-		ctx->vidcon1 |= VIDCON1_INV_VCLK;
-
-	return 0;
-}
-
 static int fimd_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
@@ -912,9 +860,10 @@ static int fimd_probe(struct platform_device *pdev)
 
 	ctx->dev = dev;
 
-	ret = fimd_get_platform_data(ctx, dev);
-	if (ret)
-		return ret;
+	if (of_property_read_bool(dev->of_node, "samsung,invert-vden"))
+		ctx->vidcon1 |= VIDCON1_INV_VDEN;
+	if (of_property_read_bool(dev->of_node, "samsung,invert-vclk"))
+		ctx->vidcon1 |= VIDCON1_INV_VCLK;
 
 	ctx->bus_clk = devm_clk_get(dev, "fimd");
 	if (IS_ERR(ctx->bus_clk)) {
@@ -956,9 +905,6 @@ static int fimd_probe(struct platform_device *pdev)
 	fimd_manager.ctx = ctx;
 	exynos_drm_manager_register(&fimd_manager);
 
-	fimd_display.ctx = ctx;
-	exynos_drm_display_register(&fimd_display);
-
 	pm_runtime_enable(dev);
 	pm_runtime_get_sync(dev);
 
@@ -974,7 +920,6 @@ static int fimd_remove(struct platform_device *pdev)
 	struct exynos_drm_manager *mgr = platform_get_drvdata(pdev);
 	struct fimd_context *ctx = mgr->ctx;
 
-	exynos_drm_display_unregister(&fimd_display);
 	exynos_drm_manager_unregister(&fimd_manager);
 
 	if (ctx->suspended)