diff mbox

[v1,2/2] drm/stm: ltdc: add a 2nd endpoint

Message ID 1509018489-19641-3-git-send-email-philippe.cornu@st.com (mailing list archive)
State New, archived
Headers show

Commit Message

Philippe CORNU Oct. 26, 2017, 11:48 a.m. UTC 
ltdc can have up to 2 endpoints:
 - dpi external gpios: for rgb panels or external bridge ICs.
 - dpi internal ios: connected internally to dsi.

Note: Refer to the reference manual to know if the dsi is
present on your device.

Signed-off-by: Philippe Cornu <philippe.cornu@st.com>
---
 drivers/gpu/drm/stm/ltdc.c | 64 ++++++++++++++++++++++++++++++++--------------
 1 file changed, 45 insertions(+), 19 deletions(-)

Comments

Benjamin Gaignard Nov. 7, 2017, 1:58 p.m. UTC | #1 
2017-10-26 13:48 GMT+02:00 Philippe Cornu <philippe.cornu@st.com>:
> ltdc can have up to 2 endpoints:
>  - dpi external gpios: for rgb panels or external bridge ICs.
>  - dpi internal ios: connected internally to dsi.
>
> Note: Refer to the reference manual to know if the dsi is
> present on your device.

Applied on drm-misc-next
Thanks

Benjamin

> Signed-off-by: Philippe Cornu <philippe.cornu@st.com>
> ---
>  drivers/gpu/drm/stm/ltdc.c | 64 ++++++++++++++++++++++++++++++++--------------
>  1 file changed, 45 insertions(+), 19 deletions(-)
>
> diff --git a/drivers/gpu/drm/stm/ltdc.c b/drivers/gpu/drm/stm/ltdc.c
> index d5c8a42..38a6739 100644
> --- a/drivers/gpu/drm/stm/ltdc.c
> +++ b/drivers/gpu/drm/stm/ltdc.c
> @@ -33,6 +33,8 @@
>
>  #define MAX_IRQ 4
>
> +#define MAX_ENDPOINTS 2
> +
>  #define HWVER_10200 0x010200
>  #define HWVER_10300 0x010300
>  #define HWVER_20101 0x020101
> @@ -886,18 +888,33 @@ int ltdc_load(struct drm_device *ddev)
>         struct ltdc_device *ldev = ddev->dev_private;
>         struct device *dev = ddev->dev;
>         struct device_node *np = dev->of_node;
> -       struct drm_bridge *bridge;
> -       struct drm_panel *panel;
> +       struct drm_bridge *bridge[MAX_ENDPOINTS] = {NULL};
> +       struct drm_panel *panel[MAX_ENDPOINTS] = {NULL};
>         struct drm_crtc *crtc;
>         struct reset_control *rstc;
>         struct resource *res;
> -       int irq, ret, i;
> +       int irq, ret, i, endpoint_not_ready = -ENODEV;
>
>         DRM_DEBUG_DRIVER("\n");
>
> -       ret = drm_of_find_panel_or_bridge(np, 0, 0, &panel, &bridge);
> -       if (ret)
> -               return ret;
> +       /* Get endpoints if any */
> +       for (i = 0; i < MAX_ENDPOINTS; i++) {
> +               ret = drm_of_find_panel_or_bridge(np, 0, i, &panel[i],
> +                                                 &bridge[i]);
> +
> +               /*
> +                * If at least one endpoint is ready, continue probing,
> +                * else if at least one endpoint is -EPROBE_DEFER and
> +                * there is no previous ready endpoints, defer probing.
> +                */
> +               if (!ret)
> +                       endpoint_not_ready = 0;
> +               else if (ret == -EPROBE_DEFER && endpoint_not_ready)
> +                       endpoint_not_ready = -EPROBE_DEFER;
> +       }
> +
> +       if (endpoint_not_ready)
> +               return endpoint_not_ready;
>
>         rstc = devm_reset_control_get_exclusive(dev, NULL);
>
> @@ -958,19 +975,25 @@ int ltdc_load(struct drm_device *ddev)
>
>         DRM_INFO("ltdc hw version 0x%08x - ready\n", ldev->caps.hw_version);
>
> -       if (panel) {
> -               bridge = drm_panel_bridge_add(panel, DRM_MODE_CONNECTOR_DPI);
> -               if (IS_ERR(bridge)) {
> -                       DRM_ERROR("Failed to create panel-bridge\n");
> -                       ret = PTR_ERR(bridge);
> -                       goto err;
> +       /* Add endpoints panels or bridges if any */
> +       for (i = 0; i < MAX_ENDPOINTS; i++) {
> +               if (panel[i]) {
> +                       bridge[i] = drm_panel_bridge_add(panel[i],
> +                                                       DRM_MODE_CONNECTOR_DPI);
> +                       if (IS_ERR(bridge[i])) {
> +                               DRM_ERROR("panel-bridge endpoint %d\n", i);
> +                               ret = PTR_ERR(bridge[i]);
> +                               goto err;
> +                       }
>                 }
> -       }
>
> -       ret = ltdc_encoder_init(ddev, bridge);
> -       if (ret) {
> -               DRM_ERROR("Failed to init encoder\n");
> -               goto err;
> +               if (bridge[i]) {
> +                       ret = ltdc_encoder_init(ddev, bridge[i]);
> +                       if (ret) {
> +                               DRM_ERROR("init encoder endpoint %d\n", i);
> +                               goto err;
> +                       }
> +               }
>         }
>
>         crtc = devm_kzalloc(dev, sizeof(*crtc), GFP_KERNEL);
> @@ -998,7 +1021,8 @@ int ltdc_load(struct drm_device *ddev)
>         return 0;
>
>  err:
> -       drm_panel_bridge_remove(bridge);
> +       for (i = 0; i < MAX_ENDPOINTS; i++)
> +               drm_panel_bridge_remove(bridge[i]);
>
>         clk_disable_unprepare(ldev->pixel_clk);
>
> @@ -1008,10 +1032,12 @@ int ltdc_load(struct drm_device *ddev)
>  void ltdc_unload(struct drm_device *ddev)
>  {
>         struct ltdc_device *ldev = ddev->dev_private;
> +       int i;
>
>         DRM_DEBUG_DRIVER("\n");
>
> -       drm_of_panel_bridge_remove(ddev->dev->of_node, 0, 0);
> +       for (i = 0; i < MAX_ENDPOINTS; i++)
> +               drm_of_panel_bridge_remove(ddev->dev->of_node, 0, i);
>
>         clk_disable_unprepare(ldev->pixel_clk);
>  }
> --
> 1.9.1
>
diff mbox

Patch

diff --git a/drivers/gpu/drm/stm/ltdc.c b/drivers/gpu/drm/stm/ltdc.c
index d5c8a42..38a6739 100644
--- a/drivers/gpu/drm/stm/ltdc.c
+++ b/drivers/gpu/drm/stm/ltdc.c
@@ -33,6 +33,8 @@ 
 
 #define MAX_IRQ 4
 
+#define MAX_ENDPOINTS 2
+
 #define HWVER_10200 0x010200
 #define HWVER_10300 0x010300
 #define HWVER_20101 0x020101
@@ -886,18 +888,33 @@  int ltdc_load(struct drm_device *ddev)
 	struct ltdc_device *ldev = ddev->dev_private;
 	struct device *dev = ddev->dev;
 	struct device_node *np = dev->of_node;
-	struct drm_bridge *bridge;
-	struct drm_panel *panel;
+	struct drm_bridge *bridge[MAX_ENDPOINTS] = {NULL};
+	struct drm_panel *panel[MAX_ENDPOINTS] = {NULL};
 	struct drm_crtc *crtc;
 	struct reset_control *rstc;
 	struct resource *res;
-	int irq, ret, i;
+	int irq, ret, i, endpoint_not_ready = -ENODEV;
 
 	DRM_DEBUG_DRIVER("\n");
 
-	ret = drm_of_find_panel_or_bridge(np, 0, 0, &panel, &bridge);
-	if (ret)
-		return ret;
+	/* Get endpoints if any */
+	for (i = 0; i < MAX_ENDPOINTS; i++) {
+		ret = drm_of_find_panel_or_bridge(np, 0, i, &panel[i],
+						  &bridge[i]);
+
+		/*
+		 * If at least one endpoint is ready, continue probing,
+		 * else if at least one endpoint is -EPROBE_DEFER and
+		 * there is no previous ready endpoints, defer probing.
+		 */
+		if (!ret)
+			endpoint_not_ready = 0;
+		else if (ret == -EPROBE_DEFER && endpoint_not_ready)
+			endpoint_not_ready = -EPROBE_DEFER;
+	}
+
+	if (endpoint_not_ready)
+		return endpoint_not_ready;
 
 	rstc = devm_reset_control_get_exclusive(dev, NULL);
 
@@ -958,19 +975,25 @@  int ltdc_load(struct drm_device *ddev)
 
 	DRM_INFO("ltdc hw version 0x%08x - ready\n", ldev->caps.hw_version);
 
-	if (panel) {
-		bridge = drm_panel_bridge_add(panel, DRM_MODE_CONNECTOR_DPI);
-		if (IS_ERR(bridge)) {
-			DRM_ERROR("Failed to create panel-bridge\n");
-			ret = PTR_ERR(bridge);
-			goto err;
+	/* Add endpoints panels or bridges if any */
+	for (i = 0; i < MAX_ENDPOINTS; i++) {
+		if (panel[i]) {
+			bridge[i] = drm_panel_bridge_add(panel[i],
+							DRM_MODE_CONNECTOR_DPI);
+			if (IS_ERR(bridge[i])) {
+				DRM_ERROR("panel-bridge endpoint %d\n", i);
+				ret = PTR_ERR(bridge[i]);
+				goto err;
+			}
 		}
-	}
 
-	ret = ltdc_encoder_init(ddev, bridge);
-	if (ret) {
-		DRM_ERROR("Failed to init encoder\n");
-		goto err;
+		if (bridge[i]) {
+			ret = ltdc_encoder_init(ddev, bridge[i]);
+			if (ret) {
+				DRM_ERROR("init encoder endpoint %d\n", i);
+				goto err;
+			}
+		}
 	}
 
 	crtc = devm_kzalloc(dev, sizeof(*crtc), GFP_KERNEL);
@@ -998,7 +1021,8 @@  int ltdc_load(struct drm_device *ddev)
 	return 0;
 
 err:
-	drm_panel_bridge_remove(bridge);
+	for (i = 0; i < MAX_ENDPOINTS; i++)
+		drm_panel_bridge_remove(bridge[i]);
 
 	clk_disable_unprepare(ldev->pixel_clk);
 
@@ -1008,10 +1032,12 @@  int ltdc_load(struct drm_device *ddev)
 void ltdc_unload(struct drm_device *ddev)
 {
 	struct ltdc_device *ldev = ddev->dev_private;
+	int i;
 
 	DRM_DEBUG_DRIVER("\n");
 
-	drm_of_panel_bridge_remove(ddev->dev->of_node, 0, 0);
+	for (i = 0; i < MAX_ENDPOINTS; i++)
+		drm_of_panel_bridge_remove(ddev->dev->of_node, 0, i);
 
 	clk_disable_unprepare(ldev->pixel_clk);
 }