drm/msm: dpu: Remove crtc_lock from setup_mixers

I think the intention here was to protect the enc->crtc access, but
that's insufficient to avoid enc->crtc changing. Fortunately we're
already holding the modeset lock when this is called (from
atomic_check), so remove the crtc_lock and add a modeset lock check.

While we're at it, use the encoder mask from crtc state instead of
legacy pointer.

Changes in v2:
- None

Reviewed-by: Jeykumar Sankaran <jsanka@codeaurora.org>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Rob Clark <robdclark@gmail.com>

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
index f359994..83f9f94 100644 (file)
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
@@ -485,19 +485,13 @@ static void _dpu_crtc_setup_mixer_for_encoder(
 
 static void _dpu_crtc_setup_mixers(struct drm_crtc *crtc)
 {
-       struct dpu_crtc *dpu_crtc = to_dpu_crtc(crtc);
        struct drm_encoder *enc;
 
-       mutex_lock(&dpu_crtc->crtc_lock);
-       /* Check for mixers on all encoders attached to this crtc */
-       list_for_each_entry(enc, &crtc->dev->mode_config.encoder_list, head) {
-               if (enc->crtc != crtc)
-                       continue;
+       WARN_ON(!drm_modeset_is_locked(&crtc->mutex));
 
+       /* Check for mixers on all encoders attached to this crtc */
+       drm_for_each_encoder_mask(enc, crtc->dev, crtc->state->encoder_mask)
                _dpu_crtc_setup_mixer_for_encoder(crtc, enc);
-       }
-
-       mutex_unlock(&dpu_crtc->crtc_lock);
 }
 
 static void _dpu_crtc_setup_lm_bounds(struct drm_crtc *crtc,