drm: rcar-du: Don't create encoder for unconnected LVDS outputs

On R-Car D3 and E3, the LVDS encoders provide the pixel clock to the DU,
even when LVDS outputs are not used. For this reason, the rcar-lvds
driver probes successfully on those platforms even if no further bridge
or panel is connected to the LVDS output, in order to provide the
rcar_lvds_clk_enable() and rcar_lvds_clk_disable() functions to the DU
driver.

If an LVDS output isn't connected, trying to create a DRM connector for
the output will fail. Fix this by skipping connector creation in that
case, and also skip creation of the DRM encoder as there's no point in
an encoder without a connector.

Fixes: e9e056949c92 ("drm: rcar-du: lvds: Convert to DRM panel bridge helper")
Reported-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>

diff --git a/drivers/gpu/drm/rcar-du/rcar_du_encoder.c b/drivers/gpu/drm/rcar-du/rcar_du_encoder.c
index 0daa8bba50f5a9097e861773ee725baf9bcb991d..4bf4e25d7f011fdacb1eabb1662f2e9fedf9d448 100644 (file)
--- a/drivers/gpu/drm/rcar-du/rcar_du_encoder.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_encoder.c
@@ -86,12 +86,20 @@ int rcar_du_encoder_init(struct rcar_du_device *rcdu,
        }
 
        /*
-        * Create and initialize the encoder. On Gen3 skip the LVDS1 output if
+        * Create and initialize the encoder. On Gen3, skip the LVDS1 output if
         * the LVDS1 encoder is used as a companion for LVDS0 in dual-link
-        * mode.
+        * mode, or any LVDS output if it isn't connected. The latter may happen
+        * on D3 or E3 as the LVDS encoders are needed to provide the pixel
+        * clock to the DU, even when the LVDS outputs are not used.
         */
-       if (rcdu->info->gen >= 3 && output == RCAR_DU_OUTPUT_LVDS1) {
-               if (rcar_lvds_dual_link(bridge))
+       if (rcdu->info->gen >= 3) {
+               if (output == RCAR_DU_OUTPUT_LVDS1 &&
+                   rcar_lvds_dual_link(bridge))
+                       return -ENOLINK;
+
+               if ((output == RCAR_DU_OUTPUT_LVDS0 ||
+                    output == RCAR_DU_OUTPUT_LVDS1) &&
+                   !rcar_lvds_is_connected(bridge))
                        return -ENOLINK;
        }
 

diff --git a/drivers/gpu/drm/rcar-du/rcar_lvds.c b/drivers/gpu/drm/rcar-du/rcar_lvds.c
index d061b8de748fdd44fe71b3628ade5e8d1b8e1a13..b672c5bd72ee888764ba58177729b2b3b8ef2378 100644 (file)
--- a/drivers/gpu/drm/rcar-du/rcar_lvds.c
+++ b/drivers/gpu/drm/rcar-du/rcar_lvds.c
@@ -576,6 +576,9 @@ static int rcar_lvds_attach(struct drm_bridge *bridge,
 {
        struct rcar_lvds *lvds = bridge_to_rcar_lvds(bridge);
 
+       if (!lvds->next_bridge)
+               return 0;
+
        return drm_bridge_attach(bridge->encoder, lvds->next_bridge, bridge,
                                 flags);
 }
@@ -598,6 +601,14 @@ bool rcar_lvds_dual_link(struct drm_bridge *bridge)
 }
 EXPORT_SYMBOL_GPL(rcar_lvds_dual_link);
 
+bool rcar_lvds_is_connected(struct drm_bridge *bridge)
+{
+       struct rcar_lvds *lvds = bridge_to_rcar_lvds(bridge);
+
+       return lvds->next_bridge != NULL;
+}
+EXPORT_SYMBOL_GPL(rcar_lvds_is_connected);
+
 /* -----------------------------------------------------------------------------
  * Probe & Remove
  */

diff --git a/drivers/gpu/drm/rcar-du/rcar_lvds.h b/drivers/gpu/drm/rcar-du/rcar_lvds.h
index 222ec0e60785ca31901d0a14cf8ce9ca89860cb3..eb7c6ef03b00afa402f15b9aac6cb4db30624cb3 100644 (file)
--- a/drivers/gpu/drm/rcar-du/rcar_lvds.h
+++ b/drivers/gpu/drm/rcar-du/rcar_lvds.h
@@ -16,6 +16,7 @@ struct drm_bridge;
 int rcar_lvds_clk_enable(struct drm_bridge *bridge, unsigned long freq);
 void rcar_lvds_clk_disable(struct drm_bridge *bridge);
 bool rcar_lvds_dual_link(struct drm_bridge *bridge);
+bool rcar_lvds_is_connected(struct drm_bridge *bridge);
 #else
 static inline int rcar_lvds_clk_enable(struct drm_bridge *bridge,
                                       unsigned long freq)
@@ -27,6 +28,10 @@ static inline bool rcar_lvds_dual_link(struct drm_bridge *bridge)
 {
        return false;
 }
+static inline bool rcar_lvds_is_connected(struct drm_bridge *bridge)
+{
+       return false;
+}
 #endif /* CONFIG_DRM_RCAR_LVDS */
 
 #endif /* __RCAR_LVDS_H__ */