drm/omap: fix missing disable for unused encoder

When an encoder is no longer connected to a crtc, the driver will leave
the encoder enabled.

This patch adds code to track the encoder used for a crtc, and when the
encoder changes, the old one is disabled.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Reviewed-by: Rob Clark <robdclark@gmail.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/gpu/drm/omapdrm/omap_crtc.c b/drivers/gpu/drm/omapdrm/omap_crtc.c
index 161a74a3ac5e..61d1c4897a45 100644
--- a/drivers/gpu/drm/omapdrm/omap_crtc.c
+++ b/drivers/gpu/drm/omapdrm/omap_crtc.c
@@ -33,6 +33,7 @@ struct omap_crtc {
         int pipe;
         enum omap_channel channel;
         struct omap_overlay_manager_info info;
+        struct drm_encoder *current_encoder;
 
         /*
          * Temporary: eventually this will go away, but it is needed
@@ -594,6 +595,11 @@ static void omap_crtc_pre_apply(struct omap_drm_apply *apply)
                 }
         }
 
+        if (omap_crtc->current_encoder && encoder != omap_crtc->current_encoder)
+                omap_encoder_set_enabled(omap_crtc->current_encoder, false);
+
+        omap_crtc->current_encoder = encoder;
+
         if (!omap_crtc->enabled) {
                 set_enabled(&omap_crtc->base, false);
                 if (encoder)