[PATCH -next v2 1/2] media: aspeed: refine hsync/vsync polarity setting logic

[Eddie James]

On 9/13/19 1:11 PM, Jae Hyun Yoo wrote:
> To prevent inaccurate detections of resolution, this commit enables
> clearing of hsync/vsync polarity bits based on probed sync state.


Thanks Jae, looks fine.

Reviewed-by: Eddie James <eajames at linux.ibm.com>


>
> Signed-off-by: Jae Hyun Yoo <jae.hyun.yoo at linux.intel.com>
> ---
> Changes since v1:
>   * Updated commit message.
>
>   drivers/media/platform/aspeed-video.c | 43 +++++++++++++--------------
>   1 file changed, 21 insertions(+), 22 deletions(-)
>
> diff --git a/drivers/media/platform/aspeed-video.c b/drivers/media/platform/aspeed-video.c
> index eb12f3793062..8f77079da55a 100644
> --- a/drivers/media/platform/aspeed-video.c
> +++ b/drivers/media/platform/aspeed-video.c
> @@ -614,7 +614,7 @@ static void aspeed_video_check_and_set_polarity(struct aspeed_video *video)
>   	int i;
>   	int hsync_counter = 0;
>   	int vsync_counter = 0;
> -	u32 sts;
> +	u32 sts, ctrl;
>   
>   	for (i = 0; i < NUM_POLARITY_CHECKS; ++i) {
>   		sts = aspeed_video_read(video, VE_MODE_DETECT_STATUS);
> @@ -629,30 +629,29 @@ static void aspeed_video_check_and_set_polarity(struct aspeed_video *video)
>   			hsync_counter++;
>   	}
>   
> -	if (hsync_counter < 0 || vsync_counter < 0) {
> -		u32 ctrl = 0;
> +	ctrl = aspeed_video_read(video, VE_CTRL);
>   
> -		if (hsync_counter < 0) {
> -			ctrl = VE_CTRL_HSYNC_POL;
> -			video->detected_timings.polarities &=
> -				~V4L2_DV_HSYNC_POS_POL;
> -		} else {
> -			video->detected_timings.polarities |=
> -				V4L2_DV_HSYNC_POS_POL;
> -		}
> -
> -		if (vsync_counter < 0) {
> -			ctrl = VE_CTRL_VSYNC_POL;
> -			video->detected_timings.polarities &=
> -				~V4L2_DV_VSYNC_POS_POL;
> -		} else {
> -			video->detected_timings.polarities |=
> -				V4L2_DV_VSYNC_POS_POL;
> -		}
> +	if (hsync_counter < 0) {
> +		ctrl |= VE_CTRL_HSYNC_POL;
> +		video->detected_timings.polarities &=
> +			~V4L2_DV_HSYNC_POS_POL;
> +	} else {
> +		ctrl &= ~VE_CTRL_HSYNC_POL;
> +		video->detected_timings.polarities |=
> +			V4L2_DV_HSYNC_POS_POL;
> +	}
>   
> -		if (ctrl)
> -			aspeed_video_update(video, VE_CTRL, 0, ctrl);
> +	if (vsync_counter < 0) {
> +		ctrl |= VE_CTRL_VSYNC_POL;
> +		video->detected_timings.polarities &=
> +			~V4L2_DV_VSYNC_POS_POL;
> +	} else {
> +		ctrl &= ~VE_CTRL_VSYNC_POL;
> +		video->detected_timings.polarities |=
> +			V4L2_DV_VSYNC_POS_POL;
>   	}
> +
> +	aspeed_video_write(video, VE_CTRL, ctrl);
>   }
>   
>   static bool aspeed_video_alloc_buf(struct aspeed_video *video,