linux-kernel - Re: [PATCH v4 7/9] media: aspeed: Support aspeed mode to reduce compressed data

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Date:   Tue, 16 Nov 2021 12:15:25 +0800
From:   Jammy Huang <jammy_huang@...eedtech.com>
To:     Sakari Ailus <sakari.ailus@...ux.intel.com>
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>,
        "hverkuil-cisco@...all.nl" <hverkuil-cisco@...all.nl>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "laurent.pinchart@...asonboard.com" 
        <laurent.pinchart@...asonboard.com>,
        "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 v4 7/9] media: aspeed: Support aspeed mode to reduce
 compressed data

Hi Sakari,

OK, I will add a patch which uses data in device table to tell the 
differences between
SoC to the series. Thanks for your advice.

On 2021/11/15 下午 04:19, Sakari Ailus wrote:
> Hi Jammy,
>
> Thanks for the patch. A few comments below...
>
> On Mon, Nov 15, 2021 at 03:44:35PM +0800, Jammy Huang wrote:
>> @@ -969,35 +1045,70 @@ static void aspeed_video_set_resolution(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);
>> +	u8 jpeg_hq_quality = clamp((int)video->jpeg_hq_quality - 1, 0,
>> +				   ASPEED_VIDEO_JPEG_NUM_QUALITIES - 1);
>> +	u32 comp_ctrl =	FIELD_PREP(VE_COMP_CTRL_DCT_LUM, video->jpeg_quality) |
>> +		FIELD_PREP(VE_COMP_CTRL_DCT_CHR, video->jpeg_quality | 0x10) |
>> +		FIELD_PREP(VE_COMP_CTRL_EN_HQ, video->hq_mode) |
>> +		FIELD_PREP(VE_COMP_CTRL_HQ_DCT_LUM, jpeg_hq_quality) |
>> +		FIELD_PREP(VE_COMP_CTRL_HQ_DCT_CHR, jpeg_hq_quality |
>> +			   0x10);
>>   	u32 ctrl = 0;
>> -	u32 seq_ctrl = VE_SEQ_CTRL_JPEG_MODE;
>> +	u32 seq_ctrl = 0;
>>   
>> -	v4l2_dbg(1, debug, &video->v4l2_dev, "framerate(%d)\n",
>> -		 video->frame_rate);
>> -	v4l2_dbg(1, debug, &video->v4l2_dev, "subsample(%s)\n",
>> +	v4l2_dbg(1, debug, &video->v4l2_dev, "framerate(%d)\n", video->frame_rate);
>> +	v4l2_dbg(1, debug, &video->v4l2_dev, "jpeg format(%s) subsample(%s)\n",
>> +		 format_str[video->format],
>>   		 video->yuv420 ? "420" : "444");
>> -	v4l2_dbg(1, debug, &video->v4l2_dev, "compression quality(%d)\n",
>> -		 video->jpeg_quality);
>> +	v4l2_dbg(1, debug, &video->v4l2_dev, "compression quality(%d) hq(%s) hq_quality(%d)\n",
>> +		 video->jpeg_quality, video->hq_mode ? "on" : "off",
>> +		 video->jpeg_hq_quality);
>> +	v4l2_dbg(1, debug, &video->v4l2_dev, "compression mode(%s)\n",
>> +		 compress_mode_str[video->compression_mode]);
>> +
>> +	if (video->format == VIDEO_FMT_ASPEED)
>> +		aspeed_video_update(video, VE_BCD_CTRL, 0, VE_BCD_CTRL_EN_BCD);
>> +	else
>> +		aspeed_video_update(video, VE_BCD_CTRL, VE_BCD_CTRL_EN_BCD, 0);
>>   
>>   	if (video->frame_rate)
>>   		ctrl |= FIELD_PREP(VE_CTRL_FRC, video->frame_rate);
>>   
>> +	if (video->format == VIDEO_FMT_STANDARD) {
>> +		comp_ctrl &= ~FIELD_PREP(VE_COMP_CTRL_EN_HQ, video->hq_mode);
>> +		seq_ctrl |= VE_SEQ_CTRL_JPEG_MODE;
>> +	}
>> +
>>   	if (video->yuv420)
>>   		seq_ctrl |= VE_SEQ_CTRL_YUV420;
>>   
>>   	if (video->jpeg.virt)
>>   		aspeed_video_update_jpeg_table(video->jpeg.virt, video->yuv420);
>>   
>> +#ifdef CONFIG_MACH_ASPEED_G4
> This would be better done based on the device recognised, not the selected
> compile target. The same goes for the rest of the conditional pre-processor
> bits.
>
>> +	switch (video->compression_mode) {
>> +	case 0:	//DCT only
>> +		comp_ctrl |= VE_COMP_CTRL_VQ_DCT_ONLY;
>> +		break;
>> +	case 1:	//DCT VQ mix 2-color
>> +		comp_ctrl &= ~(VE_COMP_CTRL_VQ_4COLOR | VE_COMP_CTRL_VQ_DCT_ONLY);
>> +		break;
>> +	case 2:	//DCT VQ mix 4-color
>> +		comp_ctrl |= VE_COMP_CTRL_VQ_4COLOR;
>> +		break;
>> +	}
>> +#endif
>> +

-- 
Best Regards
Jammy