drm/msm/mdp4: cursor fixes

It seems we need to update all cursor registers from vblank.  This
appears to be the cause of intermittent underflows when enabling/
disabling cursor.

Signed-off-by: Rob Clark <robdclark@gmail.com>

diff --git a/drivers/gpu/drm/msm/mdp/mdp4/mdp4_crtc.c b/drivers/gpu/drm/msm/mdp/mdp4/mdp4_crtc.c
index ed739e8..84c5b13 100644 (file)
--- a/drivers/gpu/drm/msm/mdp/mdp4/mdp4_crtc.c
+++ b/drivers/gpu/drm/msm/mdp/mdp4/mdp4_crtc.c
@@ -39,6 +39,7 @@ struct mdp4_crtc {
                spinlock_t lock;
                bool stale;
                uint32_t width, height;
+               uint32_t x, y;
 
                /* next cursor to scan-out: */
                uint32_t next_iova;
@@ -484,12 +485,12 @@ static int mdp4_crtc_set_property(struct drm_crtc *crtc,
 static void update_cursor(struct drm_crtc *crtc)
 {
        struct mdp4_crtc *mdp4_crtc = to_mdp4_crtc(crtc);
+       struct mdp4_kms *mdp4_kms = get_kms(crtc);
        enum mdp4_dma dma = mdp4_crtc->dma;
        unsigned long flags;
 
        spin_lock_irqsave(&mdp4_crtc->cursor.lock, flags);
        if (mdp4_crtc->cursor.stale) {
-               struct mdp4_kms *mdp4_kms = get_kms(crtc);
                struct drm_gem_object *next_bo = mdp4_crtc->cursor.next_bo;
                struct drm_gem_object *prev_bo = mdp4_crtc->cursor.scanout_bo;
                uint32_t iova = mdp4_crtc->cursor.next_iova;
@@ -521,6 +522,11 @@ static void update_cursor(struct drm_crtc *crtc)
                mdp4_crtc->cursor.scanout_bo = next_bo;
                mdp4_crtc->cursor.stale = false;
        }
+
+       mdp4_write(mdp4_kms, REG_MDP4_DMA_CURSOR_POS(dma),
+                       MDP4_DMA_CURSOR_POS_X(mdp4_crtc->cursor.x) |
+                       MDP4_DMA_CURSOR_POS_Y(mdp4_crtc->cursor.y));
+
        spin_unlock_irqrestore(&mdp4_crtc->cursor.lock, flags);
 }
 
@@ -572,6 +578,7 @@ static int mdp4_crtc_cursor_set(struct drm_crtc *crtc,
                drm_gem_object_unreference_unlocked(old_bo);
        }
 
+       crtc_flush(crtc);
        request_pending(crtc, PENDING_CURSOR);
 
        return 0;
@@ -584,12 +591,15 @@ fail:
 static int mdp4_crtc_cursor_move(struct drm_crtc *crtc, int x, int y)
 {
        struct mdp4_crtc *mdp4_crtc = to_mdp4_crtc(crtc);
-       struct mdp4_kms *mdp4_kms = get_kms(crtc);
-       enum mdp4_dma dma = mdp4_crtc->dma;
+       unsigned long flags;
 
-       mdp4_write(mdp4_kms, REG_MDP4_DMA_CURSOR_POS(dma),
-                       MDP4_DMA_CURSOR_POS_X(x) |
-                       MDP4_DMA_CURSOR_POS_Y(y));
+       spin_lock_irqsave(&mdp4_crtc->cursor.lock, flags);
+       mdp4_crtc->cursor.x = x;
+       mdp4_crtc->cursor.y = y;
+       spin_unlock_irqrestore(&mdp4_crtc->cursor.lock, flags);
+
+       crtc_flush(crtc);
+       request_pending(crtc, PENDING_CURSOR);
 
        return 0;
 }