Hi Krzysztof,

在 09/04/2015 08:41 AM, Krzysztof Kozlowski 写道:

On 03.09.2015 14:30, Yakir Yang wrote:

quoted

Hi Krzysztof,

在 09/03/2015 08:58 AM, Krzysztof Kozlowski 写道:

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On 01.09.2015 14:49, Yakir Yang wrote:

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Split the dp core driver from exynos directory to bridge
directory, and rename the core driver to analogix_dp_*,
leave the platform code to analogix_dp-exynos.

Signed-off-by: Yakir Yang <redacted>
---
Changes in v4:
- Take Rob suggest, update "analogix,hpd-gpios" to "hpd-gpios" DT
propery.
- Take Jingoo suggest, rename "analogix_dp-exynos.c" file name to
"exynos_dp.c"
- Take Archit suggest, create a separate folder for analogix code in
bridge/

Changes in v3:
- Take Thierry Reding suggest, move exynos's video_timing code
    to analogix_dp-exynos platform driver, add get_modes method
    to struct analogix_dp_plat_data.
- Take Heiko suggest, rename some "samsung*" dts propery to "analogix*".

Changes in v2:
- Take Jingoo Han suggest, remove new copyright
- Fix compiled failed dut to analogix_dp_device misspell

[.....]

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-static int exynos_dp_bridge_attach(struct drm_bridge *bridge)
+static int analogix_dp_bridge_attach(struct drm_bridge *bridge)
   {
-    struct exynos_dp_device *dp = bridge->driver_private;
-    struct drm_encoder *encoder = &dp->encoder;
+    struct analogix_dp_device *dp = bridge->driver_private;
+    struct drm_encoder *encoder = dp->encoder;
       struct drm_connector *connector = &dp->connector;
       int ret;
   -    /* Pre-empt DP connector creation if there's a bridge */
-    if (dp->ptn_bridge) {
-        ret = exynos_drm_attach_lcd_bridge(dp, encoder);
-        if (!ret)
-            return 0;
+    if (!bridge->encoder) {
+        DRM_ERROR("Parent encoder object not found");
+        return -ENODEV;
       }
   +    encoder->bridge = bridge;
+
       connector->polled = DRM_CONNECTOR_POLL_HPD;
         ret = drm_connector_init(dp->drm_dev, connector,
-                 &exynos_dp_connector_funcs,
+                 &analogix_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,
&exynos_dp_connector_helper_funcs);
+    drm_connector_helper_add(connector,
+                 &analogix_dp_connector_helper_funcs);
       drm_connector_register(connector);
       drm_mode_connector_attach_encoder(connector, encoder);
   -    if (dp->panel)
-        ret = drm_panel_attach(dp->panel, &dp->connector);
+    if (dp->plat_data && dp->plat_data->panel) {
+        ret = drm_panel_attach(dp->plat_data->panel, &dp->connector);
+        if (ret) {
+            DRM_ERROR("Failed to attach panel\n");
+            return ret;
+        }
+    }
+
+    /*
+     * This should be the end of attach function, caused
+     * we should ensure dp bridge could attach first.
+     */
+     if (dp->plat_data && dp->plat_data->attach) {
+         ret = dp->plat_data->attach(dp->plat_data, bridge);
+         if (ret) {
+             DRM_ERROR("Failed at platform attch func\n");

Two new error paths appeared here and above. Don't you have to
cleanup something? I don't know, just wondering...

Hmm... I think both panel & platform_attch need ERROR remind when
it failed. But if it still need clean, I though it should clean the platform attch
error,
this is not relate to DRM directly, just analogix driver logic, so code would like,

-    if (dp->panel)
-        ret = drm_panel_attach(dp->panel, &dp->connector);
+    if (dp->plat_data && dp->plat_data->panel) {
+        ret = drm_panel_attach(dp->plat_data->panel, &dp->connector);
+        if (ret) {
+            DRM_ERROR("Failed to attach panel\n");
+            return ret;
+        }
+    }

+    /*
+     * This should be the end of attach function, caused
+     * we should ensure dp bridge could attach first.
+     */
+     if (dp->plat_data && dp->plat_data->attach) {
+         ret = dp->plat_data->attach(dp->plat_data, bridge);

           return ret;

I am lost... the code looks the same. What did you change?

I just remove the DRM_ERROR after dp->plat_data->attach(),
maybe I should paste the change that rebase on this patch,
here are they,

     /*
      * This should be the end of attach function, caused
      * we should ensure dp bridge could attach first.
      */
-     if (dp->plat_data && dp->plat_data->attach) {
+     if (dp->plat_data && dp->plat_data->attach)
            ret = dp->plat_data->attach(dp->plat_data, bridge);
-          if (ret) {
-              DRM_ERROR("Failed at platform attch func\n");
-              return ret;
-          }
-      }

-    return 0;
+   return ret;


If this haven't meet your comment, I maybe start to think that
your comment  "Two new error paths appeared here and above"
indicated that those two function is the same.
     "dp->plat_data->attach(dp->plat_data, bridge); "
     "drm_panel_attach(dp->plat_data->panel, &dp->connector); "

Thanks,
- Yakir

Best regards,
Krzysztof