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Subject[PATCH v4 2/2] media: aspeed: Fix unstable timing detection
Date
Using stable-signal in resolution detection, and try detection again
if unstable.

VE_MODE_DETECT_EXTSRC_ADC: 1 if video source is from ADC output.
VE_MODE_DETECT_H_STABLE: 1 if horizontal signal detection is stable.
VE_MODE_DETECT_V_STABLE: 1 if vertical signal detection is stable.

Signed-off-by: Jammy Huang <jammy_huang@aspeedtech.com>
---
drivers/media/platform/aspeed-video.c | 12 ++++++++++++
1 file changed, 12 insertions(+)

diff --git a/drivers/media/platform/aspeed-video.c b/drivers/media/platform/aspeed-video.c
index 5ba4d70c8dab..585ee2997d44 100644
--- a/drivers/media/platform/aspeed-video.c
+++ b/drivers/media/platform/aspeed-video.c
@@ -165,9 +165,14 @@

#define VE_MODE_DETECT_STATUS 0x098
#define VE_MODE_DETECT_H_PERIOD GENMASK(11, 0)
+#define VE_MODE_DETECT_EXTSRC_ADC BIT(12)
+#define VE_MODE_DETECT_H_STABLE BIT(13)
+#define VE_MODE_DETECT_V_STABLE BIT(14)
#define VE_MODE_DETECT_V_LINES GENMASK(27, 16)
#define VE_MODE_DETECT_STATUS_VSYNC BIT(28)
#define VE_MODE_DETECT_STATUS_HSYNC BIT(29)
+#define VE_MODE_DETECT_VSYNC_RDY BIT(30)
+#define VE_MODE_DETECT_HSYNC_RDY BIT(31)

#define VE_SYNC_STATUS 0x09c
#define VE_SYNC_STATUS_HSYNC GENMASK(11, 0)
@@ -971,6 +976,13 @@ static void aspeed_video_get_resolution(struct aspeed_video *video)
return;
}

+ mds = aspeed_video_read(video, VE_MODE_DETECT_STATUS);
+ // try detection again if current signal isn't stable
+ if (!(mds & VE_MODE_DETECT_H_STABLE) ||
+ !(mds & VE_MODE_DETECT_V_STABLE) ||
+ (mds & VE_MODE_DETECT_EXTSRC_ADC))
+ continue;
+
aspeed_video_check_and_set_polarity(video);

aspeed_video_enable_mode_detect(video);
--
2.25.1
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