drm: fimd: support display writeback mode

This patch supports exynos drm display writeback mode that clone
the screen with fimd like below.

FIMD----->FIMC H/W---->MEMORY

Change-Id: I8172ec6ee157e2e48a23b9776e11543c33716dc5
Signed-off-by: Donghwa Lee <dh09.lee@samsung.com>

4 files changed, 111 insertions, 21 deletions

diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.h b/drivers/gpu/drm/exynos/exynos_drm_drv.h
index 3e825229bb0..c787172d3a7 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_drv.h
+++ b/drivers/gpu/drm/exynos/exynos_drm_drv.h
@@ -53,6 +53,22 @@ enum exynos_drm_output_type {
 	EXYNOS_DISPLAY_TYPE_VIDI,
 };
 
+enum exynos_drm_display_mode {
+	EXYNOS_DISPLAY_OUTPUT_NONE,
+	EXYNOS_DISPLAY_OUTPUT_WB,
+};
+
+/*
+ * A structure of wb setting infomation.
+ *
+ * @enable: enable flag for wb.
+ * @refresh: HZ of the refresh rate.
+ */
+struct drm_exynos_display_set_wb {
+	__u32	enable;
+	__u32	refresh;
+};
+
 /*
  * Exynos drm common overlay structure.
  *
@@ -364,6 +380,9 @@ int exynos_platform_device_ipp_register(void);
  */
 void exynos_platform_device_ipp_unregister(void);
 
+extern int exynos_drm_ippnb_register(struct notifier_block *nb);
+extern int exynos_drm_ippnb_unregister(struct notifier_block *nb);
+
 #ifdef CONFIG_DRM_EXYNOS_DPI
 int exynos_dpi_probe(struct device *dev);
 int exynos_dpi_remove(struct device *dev);
diff --git a/drivers/gpu/drm/exynos/exynos_drm_fimc.c b/drivers/gpu/drm/exynos/exynos_drm_fimc.c
index 3c6931c780f..73c51363862 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_fimc.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_fimc.c
@@ -1640,7 +1640,7 @@ static int fimc_ippdrv_start(struct device *dev, enum drm_exynos_ipp_cmd cmd)
 	struct drm_exynos_ipp_property *property;
 	struct drm_exynos_ipp_config *config;
 	struct drm_exynos_pos	img_pos[EXYNOS_DRM_OPS_MAX];
-	struct drm_exynos_ipp_set_wb set_wb;
+	struct drm_exynos_display_set_wb set_wb;
 	int ret, i;
 	u32 cfg0, cfg1;
 
@@ -1697,7 +1697,7 @@ static int fimc_ippdrv_start(struct device *dev, enum drm_exynos_ipp_cmd cmd)
 
 		set_wb.enable = 1;
 		set_wb.refresh = property->refresh_rate;
-		exynos_drm_ippnb_send_event(IPP_SET_WRITEBACK, (void *)&set_wb);
+		exynos_drm_ippnb_send_event(EXYNOS_DISPLAY_OUTPUT_WB, (void *)&set_wb);
 		break;
 	case IPP_CMD_OUTPUT:
 	default:
@@ -1742,7 +1742,7 @@ static int fimc_ippdrv_start(struct device *dev, enum drm_exynos_ipp_cmd cmd)
 static void fimc_ippdrv_stop(struct device *dev, enum drm_exynos_ipp_cmd cmd)
 {
 	struct fimc_context *ctx = get_fimc_context(dev);
-	struct drm_exynos_ipp_set_wb set_wb = {0, 0};
+	struct drm_exynos_display_set_wb set_wb = {0, 0};
 	u32 cfg;
 
 	DRM_DEBUG_KMS("%s:cmd[%d]\n", __func__, cmd);
@@ -1756,7 +1756,7 @@ static void fimc_ippdrv_stop(struct device *dev, enum drm_exynos_ipp_cmd cmd)
 		fimc_write(ctx, cfg, EXYNOS_MSCTRL);
 		break;
 	case IPP_CMD_WB:
-		exynos_drm_ippnb_send_event(IPP_SET_WRITEBACK, (void *)&set_wb);
+		exynos_drm_ippnb_send_event(EXYNOS_DISPLAY_OUTPUT_WB, (void *)&set_wb);
 		break;
 	case IPP_CMD_OUTPUT:
 	default:
diff --git a/drivers/gpu/drm/exynos/exynos_drm_fimd.c b/drivers/gpu/drm/exynos/exynos_drm_fimd.c
index c3d8786cd94..6e5e1a84d72 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_fimd.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_fimd.c
@@ -169,6 +169,7 @@ struct fimd_context {
 
 	struct exynos_drm_panel_info panel;
 	struct fimd_driver_data *driver_data;
+	struct notifier_block	nb_ctrl;
 };
 
 static const struct of_device_id fimd_driver_dt_match[] = {
@@ -1053,6 +1054,78 @@ out:
 	return IRQ_HANDLED;
 }
 
+static void fimd_set_writeback(struct fimd_context *ctx, int enable,
+		unsigned int refresh)
+{
+	u32 vidcon0 = readl(ctx->regs + VIDCON0);
+	u32 vidcon2 = readl(ctx->regs + VIDCON2);
+
+	DRM_DEBUG_KMS("%s:wb[%d]refresh[%d]\n",
+		__func__, enable, refresh);
+
+	vidcon0 &= ~VIDCON0_VIDOUT_MASK;
+	vidcon2 &= ~(VIDCON2_WB_MASK |
+			VIDCON2_WB_SKIP_MASK |
+			VIDCON2_TVFMTSEL_SW |
+			VIDCON2_TVFORMATSEL_MASK);
+
+	if (enable) {
+		vidcon0 |= VIDCON0_VIDOUT_WB_RGB;
+		vidcon2 |= (VIDCON2_WB_ENABLE |
+				VIDCON2_TVFMTSEL_SW |
+				VIDCON2_TVFMTSEL1_YUV444);
+
+		if (refresh >= 60 || refresh == 0)
+			DRM_INFO("%s:refresh[%d],forced set to 60hz.\n",
+				__func__, refresh);
+		else if (refresh >= 30)
+			vidcon2 |= VIDCON2_WB_SKIP_1_2;
+		else if (refresh >= 20)
+			vidcon2 |= VIDCON2_WB_SKIP_1_3;
+		else if (refresh >= 15)
+			vidcon2 |= VIDCON2_WB_SKIP_1_4;
+		else
+			vidcon2 |= VIDCON2_WB_SKIP_1_5;
+	} else {
+		if (ctx->i80_if)
+			vidcon0 |= VIDCON0_VIDOUT_I80_LDI0;
+		else
+			vidcon0 |= VIDCON0_VIDOUT_RGB;
+		vidcon2 |= VIDCON2_WB_DISABLE;
+	}
+
+	writel(vidcon0, ctx->regs + VIDCON0);
+	writel(vidcon2, ctx->regs + VIDCON2);
+}
+
+static int fimd_notifier_ctrl(struct notifier_block *this,
+			unsigned long event, void *_data)
+{
+	struct fimd_context *ctx = container_of(this,
+				struct fimd_context, nb_ctrl);
+
+	if (ctx->suspended)
+		return -EPERM;
+
+	switch (event) {
+	case EXYNOS_DISPLAY_OUTPUT_WB: {
+		struct drm_exynos_display_set_wb *set_wb =
+			(struct drm_exynos_display_set_wb *)_data;
+		unsigned int refresh = set_wb->refresh;
+		int enable = *((int *)&set_wb->enable);
+
+		fimd_set_writeback(ctx, enable, refresh);
+	}
+		break;
+	default:
+		/* ToDo : for checking use case */
+		DRM_INFO("%s:event[0x%x]\n", __func__, (unsigned int)event);
+		break;
+	}
+
+	return NOTIFY_DONE;
+}
+
 static int fimd_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
@@ -1149,6 +1222,13 @@ static int fimd_probe(struct platform_device *pdev)
 	init_waitqueue_head(&ctx->wait_vsync_queue);
 	atomic_set(&ctx->wait_vsync_event, 0);
 
+	ctx->nb_ctrl.notifier_call = fimd_notifier_ctrl;
+	ret = exynos_drm_ippnb_register(&ctx->nb_ctrl);
+	if (ret) {
+		dev_err(dev, "could not register fimd notify callback\n");
+		return ret;
+	}
+
 	platform_set_drvdata(pdev, &fimd_manager);
 
 	fimd_manager.ctx = ctx;
@@ -1167,9 +1247,17 @@ static int fimd_probe(struct platform_device *pdev)
 static int fimd_remove(struct platform_device *pdev)
 {
 	struct exynos_drm_manager *mgr = platform_get_drvdata(pdev);
+	struct fimd_context *ctx = mgr->ctx;
+	int ret;
 
 	exynos_dpi_remove(&pdev->dev);
 
+	ret = exynos_drm_ippnb_unregister(&ctx->nb_ctrl);
+	if (ret) {
+		dev_err(&pdev->dev, "could not unregister fimd notify callback\n");
+		return ret;
+	}
+
 	exynos_drm_manager_unregister(&fimd_manager);
 
 	fimd_dpms(mgr, DRM_MODE_DPMS_OFF);
diff --git a/drivers/gpu/drm/exynos/exynos_drm_ipp.h b/drivers/gpu/drm/exynos/exynos_drm_ipp.h
index 9af69b3ca81..84e2b3aa634 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_ipp.h
+++ b/drivers/gpu/drm/exynos/exynos_drm_ipp.h
@@ -20,10 +20,6 @@
 #define for_each_ipp_planar(pos)	\
 	for (pos = 0; pos < EXYNOS_DRM_PLANAR_MAX; pos++)
 
-#define IPP_GET_LCD_WIDTH	_IOR('F', 302, int)
-#define IPP_GET_LCD_HEIGHT	_IOR('F', 303, int)
-#define IPP_SET_WRITEBACK	_IOW('F', 304, u32)
-
 /* definition of state */
 enum drm_exynos_ipp_state {
 	IPP_STATE_IDLE,
@@ -94,17 +90,6 @@ struct drm_exynos_ipp_buf_info {
 };
 
 /*
- * A structure of wb setting infomation.
- *
- * @enable: enable flag for wb.
- * @refresh: HZ of the refresh rate.
- */
-struct drm_exynos_ipp_set_wb {
-	__u32	enable;
-	__u32	refresh;
-};
-
-/*
  * A structure of event work information.
  *
  * @work: work structure.
@@ -189,8 +174,6 @@ extern int exynos_drm_ipp_queue_buf(struct drm_device *drm_dev, void *data,
 					 struct drm_file *file);
 extern int exynos_drm_ipp_cmd_ctrl(struct drm_device *drm_dev, void *data,
 					 struct drm_file *file);
-extern int exynos_drm_ippnb_register(struct notifier_block *nb);
-extern int exynos_drm_ippnb_unregister(struct notifier_block *nb);
 extern int exynos_drm_ippnb_send_event(unsigned long val, void *v);
 extern void ipp_sched_cmd(struct work_struct *work);
 extern void ipp_sched_event(struct work_struct *work);