[DPU PATCH 1/2] drm/msm/dsi: check video mode engine status before waiting

[Abhinav Kumar]

Make sure the video mode engine is on before waiting
for the video done interrupt.

Otherwise it leads to silent timeouts increasing display
turn ON time.

Signed-off-by: Abhinav Kumar <abhinavk at codeaurora.org>
---
 drivers/gpu/drm/msm/dsi/dsi_host.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c
index 7a03a94..24766c3 100644
--- a/drivers/gpu/drm/msm/dsi/dsi_host.c
+++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
@@ -173,6 +173,7 @@ struct msm_dsi_host {
 
 	bool registered;
 	bool power_on;
+	bool enabled;
 	int irq;
 };
 
@@ -986,13 +987,18 @@ static void dsi_set_tx_power_mode(int mode, struct msm_dsi_host *msm_host)
 
 static void dsi_wait4video_done(struct msm_dsi_host *msm_host)
 {
+	u32 ret = 0;
+
 	dsi_intr_ctrl(msm_host, DSI_IRQ_MASK_VIDEO_DONE, 1);
 
 	reinit_completion(&msm_host->video_comp);
 
-	wait_for_completion_timeout(&msm_host->video_comp,
+	ret = wait_for_completion_timeout(&msm_host->video_comp,
 			msecs_to_jiffies(70));
 
+	if (ret <= 0)
+		pr_err("wait for video done failed\n");
+
 	dsi_intr_ctrl(msm_host, DSI_IRQ_MASK_VIDEO_DONE, 0);
 }
 
@@ -1001,7 +1007,7 @@ static void dsi_wait4video_eng_busy(struct msm_dsi_host *msm_host)
 	if (!(msm_host->mode_flags & MIPI_DSI_MODE_VIDEO))
 		return;
 
-	if (msm_host->power_on) {
+	if (msm_host->power_on && msm_host->enabled) {
 		dsi_wait4video_done(msm_host);
 		/* delay 4 ms to skip BLLP */
 		usleep_range(2000, 4000);
@@ -2203,7 +2209,7 @@ int msm_dsi_host_enable(struct mipi_dsi_host *host)
 	 *	pm_runtime_put_autosuspend(&msm_host->pdev->dev);
 	 * }
 	 */
-
+	msm_host->enabled = true;
 	return 0;
 }
 
@@ -2219,7 +2225,7 @@ int msm_dsi_host_disable(struct mipi_dsi_host *host)
 	 * Reset to disable video engine so that we can send off cmd.
 	 */
 	dsi_sw_reset(msm_host);
-
+	msm_host->enabled = false;
 	return 0;
 }
 
-- 
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