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 <redacted>
---
 drivers/media/platform/aspeed-video.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/media/platform/aspeed-video.c b/drivers/media/platform/aspeed-video.c
index 5d1ec3de50ad..eb9c17ac0e14 100644
--- a/drivers/media/platform/aspeed-video.c
+++ b/drivers/media/platform/aspeed-video.c

@@ -153,9 +153,14 @@

 #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)

@@ -909,6 +914,7 @@ static void aspeed_video_get_resolution(struct aspeed_video *video)
        bool invalid_resolution = true;
        int rc;
        int tries = 0;
+       u32 mds;
        u32 src_lr_edge;
        u32 src_tb_edge;
        struct v4l2_bt_timings *det = &video->detected_timings;

@@ -939,6 +945,13 @@ 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