linux-kernel - [PATCH] media: aspeed: fix mode-detect always timeout at 2nd run

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Date:   Tue, 2 Nov 2021 15:13:37 +0800
From:   Jammy Huang <jammy_huang@...eedtech.com>
To:     <eajames@...ux.ibm.com>, <mchehab@...nel.org>, <joel@....id.au>,
        <andrew@...id.au>, <linux-media@...r.kernel.org>,
        <openbmc@...ts.ozlabs.org>, <linux-arm-kernel@...ts.infradead.org>,
        <linux-aspeed@...ts.ozlabs.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH] media: aspeed: fix mode-detect always timeout at 2nd run

aspeed_video_get_resolution() will try to do res-detect again if the
timing got in last try is invalid. But it will always timeout because
VE_SEQ_CTRL_TRIG_MODE_DET only cleared after 1st mode-detect.

To fix the problem, just clear VE_SEQ_CTRL_TRIG_MODE_DET before set in
aspeed_video_enable_mode_detect().

Signed-off-by: Jammy Huang <jammy_huang@...eedtech.com>
---
 drivers/media/platform/aspeed-video.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/media/platform/aspeed-video.c b/drivers/media/platform/aspeed-video.c
index cd2b71c81e31..b470f4b68aa0 100644
--- a/drivers/media/platform/aspeed-video.c
+++ b/drivers/media/platform/aspeed-video.c
@@ -611,6 +611,10 @@ static void aspeed_video_enable_mode_detect(struct aspeed_video *video)
 	aspeed_video_update(video, VE_INTERRUPT_CTRL, 0,
 			    VE_INTERRUPT_MODE_DETECT);
 
+	/* Disable mode detect in order to re-trigger */
+	aspeed_video_update(video, VE_SEQ_CTRL,
+			    VE_SEQ_CTRL_TRIG_MODE_DET, 0);
+
 	/* Trigger mode detect */
 	aspeed_video_update(video, VE_SEQ_CTRL, 0, VE_SEQ_CTRL_TRIG_MODE_DET);
 }
@@ -930,10 +934,6 @@ static void aspeed_video_get_resolution(struct aspeed_video *video)
 			return;
 		}
 
-		/* Disable mode detect in order to re-trigger */
-		aspeed_video_update(video, VE_SEQ_CTRL,
-				    VE_SEQ_CTRL_TRIG_MODE_DET, 0);
-
 		aspeed_video_check_and_set_polarity(video);
 
 		aspeed_video_enable_mode_detect(video);
-- 
2.25.1