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Subject[PATCH v1 2/2] drm/stm: ltdc: add a 2nd endpoint
Date
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(-)

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
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