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Date:   Fri, 15 Oct 2021 13:39:08 +0800
From:   Jammy Huang <jammy_huang@...eedtech.com>
To:     Paul Menzel <pmenzel@...gen.mpg.de>
CC:     "eajames@...ux.ibm.com" <eajames@...ux.ibm.com>,
        "mchehab@...nel.org" <mchehab@...nel.org>,
        "joel@....id.au" <joel@....id.au>,
        "andrew@...id.au" <andrew@...id.au>,
        "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
        "openbmc@...ts.ozlabs.org" <openbmc@...ts.ozlabs.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-aspeed@...ts.ozlabs.org" <linux-aspeed@...ts.ozlabs.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/6] media: aspeed: refine to centerize format/compress
 settings

Dear Paul,


On 2021/10/14 下午 02:36, Paul Menzel wrote:
> Dear Jammy,
>
>
> Am 14.10.21 um 05:48 schrieb Jammy Huang:
>
>> [PATCH 3/6] media: aspeed: refine to centerize format/compress settings
> Do you mean to “refactor”? Maybe:
>
>> Refactor format/compress settings into dedicated function
>> Add API, aspeed_video_update_regs(), to centerize format/compress settings
>> which are controlled by user.
> I do not know “centerize”. Maybe somebody else has an idea.
Sorry, I mean 'gather' here.
>> … to control format/compress settings controlled by the user.
> Could you please paste the new log messages?
Sure.
>
>> Signed-off-by: Jammy Huang <jammy_huang@...eedtech.com>
>> ---
>>    drivers/media/platform/aspeed-video.c | 68 +++++++++++++--------------
>>    1 file changed, 34 insertions(+), 34 deletions(-)
>>
>> diff --git a/drivers/media/platform/aspeed-video.c b/drivers/media/platform/aspeed-video.c
>> index 7b8129b0ca5f..3b5a3935325d 100644
>> --- a/drivers/media/platform/aspeed-video.c
>> +++ b/drivers/media/platform/aspeed-video.c
>> @@ -974,20 +974,41 @@ static void aspeed_video_set_resolution(struct aspeed_video *video)
>>    		aspeed_video_free_buf(video, &video->srcs[0]);
>>    }
>>    
>> -static void aspeed_video_init_regs(struct aspeed_video *video)
>> +static void aspeed_video_update_regs(struct aspeed_video *video)
>>    {
>>    	u32 comp_ctrl = VE_COMP_CTRL_RSVD |
>>    		FIELD_PREP(VE_COMP_CTRL_DCT_LUM, video->jpeg_quality) |
>>    		FIELD_PREP(VE_COMP_CTRL_DCT_CHR, video->jpeg_quality | 0x10);
>> -	u32 ctrl = VE_CTRL_AUTO_OR_CURSOR;
>> +	u32 ctrl = 0;
>>    	u32 seq_ctrl = VE_SEQ_CTRL_JPEG_MODE;
>>    
>> +	dprintk(LOG_INFO, "framerate(%d)\n", video->frame_rate);
>> +	dprintk(LOG_INFO, "subsample(%s)\n",
>> +		video->yuv420 ? "420" : "444");
>> +	dprintk(LOG_INFO, "compression quality(%d)\n",
>> +		video->jpeg_quality);
>> +
>>    	if (video->frame_rate)
>>    		ctrl |= FIELD_PREP(VE_CTRL_FRC, video->frame_rate);
>>    
>>    	if (video->yuv420)
>>    		seq_ctrl |= VE_SEQ_CTRL_YUV420;
>>    
>> +	if (video->jpeg.virt)
>> +		aspeed_video_update_jpeg_table(video->jpeg.virt, video->yuv420);
>> +
>> +	/* Set control registers */
>> +	aspeed_video_update(video, VE_SEQ_CTRL,
>> +			    VE_SEQ_CTRL_JPEG_MODE | VE_SEQ_CTRL_YUV420,
>> +			    seq_ctrl);
>> +	aspeed_video_update(video, VE_CTRL, VE_CTRL_FRC, ctrl);
>> +	aspeed_video_update(video, VE_COMP_CTRL,
>> +			    VE_COMP_CTRL_DCT_LUM | VE_COMP_CTRL_DCT_CHR,
>> +			    comp_ctrl);
>> +}
>> +
>> +static void aspeed_video_init_regs(struct aspeed_video *video)
>> +{
>>    	/* Unlock VE registers */
>>    	aspeed_video_write(video, VE_PROTECTION_KEY, VE_PROTECTION_KEY_UNLOCK);
>>    
>> @@ -1002,9 +1023,8 @@ static void aspeed_video_init_regs(struct aspeed_video *video)
>>    	aspeed_video_write(video, VE_JPEG_ADDR, video->jpeg.dma);
>>    
>>    	/* Set control registers */
>> -	aspeed_video_write(video, VE_SEQ_CTRL, seq_ctrl);
>> -	aspeed_video_write(video, VE_CTRL, ctrl);
>> -	aspeed_video_write(video, VE_COMP_CTRL, comp_ctrl);
>> +	aspeed_video_write(video, VE_CTRL, VE_CTRL_AUTO_OR_CURSOR);
>> +	aspeed_video_write(video, VE_COMP_CTRL, VE_COMP_CTRL_RSVD);
> Why is this changed?

Previously, there are 2 places, aspeed_video_init_regs() and 
aspeed_video_update_jpeg_quality(),
to modify reg-value for 'jpeg_quality'. Same condition for 
'subsampling'. There will be more parameters
related to capture/compress settings in later patch for aspeed-format. 
So I want to have these reg-value
modification codes happen at once and at one place.

In above code, I separate aspeed_video_update_regs() from 
aspeed_video_init_regs().
aspeed_video_init_regs() only gives default settings for VE_CTRL & 
VE_COMP_CTRL now.

>
>>    
>>    	/* Don't downscale */
>>    	aspeed_video_write(video, VE_SCALING_FACTOR, 0x10001000);
>> @@ -1335,27 +1355,6 @@ static const struct v4l2_ioctl_ops aspeed_video_ioctl_ops = {
>>    	.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
>>    };
>>    
>> -static void aspeed_video_update_jpeg_quality(struct aspeed_video *video)
>> -{
>> -	u32 comp_ctrl = FIELD_PREP(VE_COMP_CTRL_DCT_LUM, video->jpeg_quality) |
>> -		FIELD_PREP(VE_COMP_CTRL_DCT_CHR, video->jpeg_quality | 0x10);
>> -
>> -	aspeed_video_update(video, VE_COMP_CTRL,
>> -			    VE_COMP_CTRL_DCT_LUM | VE_COMP_CTRL_DCT_CHR,
>> -			    comp_ctrl);
>> -}
>> -
>> -static void aspeed_video_update_subsampling(struct aspeed_video *video)
>> -{
>> -	if (video->jpeg.virt)
>> -		aspeed_video_update_jpeg_table(video->jpeg.virt, video->yuv420);
>> -
>> -	if (video->yuv420)
>> -		aspeed_video_update(video, VE_SEQ_CTRL, 0, VE_SEQ_CTRL_YUV420);
>> -	else
>> -		aspeed_video_update(video, VE_SEQ_CTRL, VE_SEQ_CTRL_YUV420, 0);
>> -}
>> -
>>    static int aspeed_video_set_ctrl(struct v4l2_ctrl *ctrl)
>>    {
>>    	struct aspeed_video *video = container_of(ctrl->handler,
>> @@ -1365,16 +1364,13 @@ static int aspeed_video_set_ctrl(struct v4l2_ctrl *ctrl)
>>    	switch (ctrl->id) {
>>    	case V4L2_CID_JPEG_COMPRESSION_QUALITY:
>>    		video->jpeg_quality = ctrl->val;
>> -		aspeed_video_update_jpeg_quality(video);
>> +		if (test_bit(VIDEO_STREAMING, &video->flags))
>> +			aspeed_video_update_regs(video);
>>    		break;
>>    	case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
>> -		if (ctrl->val == V4L2_JPEG_CHROMA_SUBSAMPLING_420) {
>> -			video->yuv420 = true;
>> -			aspeed_video_update_subsampling(video);
>> -		} else {
>> -			video->yuv420 = false;
>> -			aspeed_video_update_subsampling(video);
>> -		}
>> +		video->yuv420 = (ctrl->val == V4L2_JPEG_CHROMA_SUBSAMPLING_420);
>> +		if (test_bit(VIDEO_STREAMING, &video->flags))
>> +			aspeed_video_update_regs(video);
>>    		break;
>>    	default:
>>    		return -EINVAL;
>> @@ -1404,6 +1400,8 @@ static void aspeed_video_resolution_work(struct work_struct *work)
>>    
>>    	aspeed_video_init_regs(video);
>>    
>> +	aspeed_video_update_regs(video);
>> +
>>    	aspeed_video_get_resolution(video);
>>    
>>    	if (video->detected_timings.width != video->active_timings.width ||
>> @@ -1518,6 +1516,8 @@ static int aspeed_video_start_streaming(struct vb2_queue *q,
>>    	video->perf.duration_max = 0;
>>    	video->perf.duration_min = 0xffffffff;
>>    
>> +	aspeed_video_update_regs(video);
>> +
>>    	rc = aspeed_video_start_frame(video);
>>    	if (rc) {
>>    		aspeed_video_bufs_done(video, VB2_BUF_STATE_QUEUED);
>>
> Kind regards,
>
> Paul

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