drm/arm/mali-dp: Add a loop around the second set CVAL and try 5 times

This patch trying to fix monitor freeze issue caused by drm error
'flip_done timed out' on LS1028A platform. this set try is make a loop
around the second setting CVAL and try like 5 times before giveing up.

Signed-off-by: Wen He <wen.he_1@nxp.com>
Signed-off-by: Liviu Dudau <liviu.dudau@arm.com>

diff --git a/drivers/gpu/drm/arm/malidp_drv.c b/drivers/gpu/drm/arm/malidp_drv.c
index 21725c9b9f5e0d3a5c15e5b96e2b9f053aa31ce9..18cb7f134f4e700e3b99d83cdea6508e189c823d 100644 (file)
--- a/drivers/gpu/drm/arm/malidp_drv.c
+++ b/drivers/gpu/drm/arm/malidp_drv.c
@@ -192,6 +192,7 @@ static void malidp_atomic_commit_hw_done(struct drm_atomic_state *state)
 {
        struct drm_device *drm = state->dev;
        struct malidp_drm *malidp = drm->dev_private;
+       int loop = 5;
 
        malidp->event = malidp->crtc.state->event;
        malidp->crtc.state->event = NULL;
@@ -206,8 +207,18 @@ static void malidp_atomic_commit_hw_done(struct drm_atomic_state *state)
                        drm_crtc_vblank_get(&malidp->crtc);
 
                /* only set config_valid if the CRTC is enabled */
-               if (malidp_set_and_wait_config_valid(drm) < 0)
+               if (malidp_set_and_wait_config_valid(drm) < 0) {
+                       /*
+                        * make a loop around the second CVAL setting and
+                        * try 5 times before giving up.
+                        */
+                       while (loop--) {
+                               if (!malidp_set_and_wait_config_valid(drm))
+                                       break;
+                       }
                        DRM_DEBUG_DRIVER("timed out waiting for updated configuration\n");
+               }
+
        } else if (malidp->event) {
                /* CRTC inactive means vblank IRQ is disabled, send event directly */
                spin_lock_irq(&drm->event_lock);