linux-kernel - Re: [PATCH] media: aspeed: Fix signal status not updated immediately

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Message-ID: <cd62eba4-2553-6837-6069-52a209e48b8c@molgen.mpg.de>
Date:   Mon, 8 Nov 2021 08:57:18 +0100
From:   Paul Menzel <pmenzel@...gen.mpg.de>
To:     Jammy Huang <jammy_huang@...eedtech.com>
Cc:     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: Re: [PATCH] media: aspeed: Fix signal status not updated immediately

Dear Jammy,


Am 08.11.21 um 07:11 schrieb Jammy Huang:

Maybe for the commit message summary:

media: aspeed: Update signal status immediately to ensure sane hw state


> If res-chg, VE_INTERRUPT_MODE_DETECT_WD irq will be raised. But
> v4l2_input_status wont't be updated to no-signal immediately until

won’t

> aspeed_video_get_resolution() in aspeed_video_resolution_work().
> 
> During the period of time, aspeed_video_start_frame() could be called
> because it doesn't know signal is unstable now. If it goes with
> aspeed_video_init_regs() of aspeed_video_irq_res_change() simultaneously
> , it will mess up hw state.

Please do not start a line with a comma, for example, put the comma on 
the line above.

> To fix this problem, v4l2_input_status will be updated to no-signal

… status is updated _ (Present tense in commit messages.)

> immediately for VE_INTERRUPT_MODE_DETECT_WD irq.
> 
> Fixes: d2b4387f3bdf ("media: platform: Add Aspeed Video Engine driver")
> Signed-off-by: Jammy Huang <jammy_huang@...eedtech.com>
> ---
>   drivers/media/platform/aspeed-video.c | 6 +++---
>   1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/media/platform/aspeed-video.c b/drivers/media/platform/aspeed-video.c
> index 1ade264a8b69..3facd7ecc1a1 100644
> --- a/drivers/media/platform/aspeed-video.c
> +++ b/drivers/media/platform/aspeed-video.c
> @@ -762,6 +762,8 @@ static void aspeed_video_irq_res_change(struct aspeed_video *video, ulong delay)
>   	set_bit(VIDEO_RES_CHANGE, &video->flags);
>   	clear_bit(VIDEO_FRAME_INPRG, &video->flags);
>   
> +	video->v4l2_input_status = V4L2_IN_ST_NO_SIGNAL;
> +
>   	aspeed_video_off(video);
>   	aspeed_video_on(video);
>   	aspeed_video_bufs_done(video, VB2_BUF_STATE_ERROR);
> @@ -1889,7 +1891,6 @@ static void aspeed_video_resolution_work(struct work_struct *work)
>   	struct delayed_work *dwork = to_delayed_work(work);
>   	struct aspeed_video *video = container_of(dwork, struct aspeed_video,
>   						  res_work);
> -	u32 input_status = video->v4l2_input_status;
>   
>   	/* Exit early in case no clients remain */
>   	if (test_bit(VIDEO_STOPPED, &video->flags))
> @@ -1902,8 +1903,7 @@ static void aspeed_video_resolution_work(struct work_struct *work)
>   	aspeed_video_get_resolution(video);
>   
>   	if (video->detected_timings.width != video->active_timings.width ||
> -	    video->detected_timings.height != video->active_timings.height ||
> -	    input_status != video->v4l2_input_status) {
> +	    video->detected_timings.height != video->active_timings.height) {
>   		static const struct v4l2_event ev = {
>   			.type = V4L2_EVENT_SOURCE_CHANGE,
>   			.u.src_change.changes = V4L2_EVENT_SRC_CH_RESOLUTION,
> 

Acked-by: Paul Menzel <pmenzel@...gen.mpg.de>


Kind regards,

Paul