drm/msm/mdp5: Disable pingpong autorefresh at tearcheck init

If pp autorefresh is up (from bootloader splash), we will surely get
vblank and pp timeouts.  Ensure it is turned off.
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@somainline.org>
Signed-off-by: Marijn Suijten <marijn.suijten@somainline.org>
Link: https://lore.kernel.org/r/20210406214726.131534-4-marijn.suijten@somainline.orgSigned-off-by: Rob Clark <robdclark@chromium.org>

drivers/gpu/drm/msm/disp/mdp5/mdp5_cmd_encoder.c

@@ -67,6 +67,7 @@ static int pingpong_tearcheck_setup(struct drm_encoder *encoder,
 	mdp5_write(mdp5_kms, REG_MDP5_PP_SYNC_THRESH(pp_id),
 			MDP5_PP_SYNC_THRESH_START(4) |
 			MDP5_PP_SYNC_THRESH_CONTINUE(4));
+	mdp5_write(mdp5_kms, REG_MDP5_PP_AUTOREFRESH_CONFIG(pp_id), 0x0);
 
 	return 0;
 }