linux-kernel - Re: [PATCH v2] media: aspeed: Use full swing as JFIF to fix incorrect color

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Message-ID: <fcad21a9-c7f6-4dd9-7fa8-8a6e6f3853f2@aspeedtech.com>
Date:   Thu, 10 Feb 2022 09:03:35 +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 v2] media: aspeed: Use full swing as JFIF to fix incorrect
 color

Dear Paul,

OK, I will update a new patch per your suggestion.

Thanks for your help.

On 2022/2/9 下午 05:06, Paul Menzel wrote:
> Dear Jammy,
>
>
> Am 09.02.22 um 09:42 schrieb Jammy Huang:
>> Current settings for video capture rgb-2-yuv is BT.601(studio swing),
>> but JFIF uses BT.601(full swing) to deocde. This mismatch will lead
>> to incorrect color. For example, input RGB value, (0, 0, 255), will
>> become (16, 16, 235) after jpg decoded.
>>
>> Add an enum, aspeed_video_capture_format, to define VR008[7:6]
>> capture format and correct default settings for video capture to fix
>> the problem.
> Maybe quote the datasheet:
>
> VR008[7:6] will decide the data format for video capture:
> 00: CCIR601 studio swing compliant YUV format
> 01: CCIR601 full swing compliant YUV format
> 10: RGB format
> 11: Gray color mode
>
>> Signed-off-by: Jammy Huang <jammy_huang@...eedtech.com>
>> ---
>> v2:
>>    - update subject from 'media: aspeed: Fix-incorrect-color' to
>>      'media: aspeed: Use full swing as JFIF to fix incorrect'
>>    - update commit message
>>    - add enum, aspeed_video_capture_format, to define VR008[7:6]
>> ---
>>    drivers/media/platform/aspeed-video.c | 14 +++++++++++---
>>    1 file changed, 11 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/media/platform/aspeed-video.c b/drivers/media/platform/aspeed-video.c
>> index eb9c17ac0e14..5bcf60b4628b 100644
>> --- a/drivers/media/platform/aspeed-video.c
>> +++ b/drivers/media/platform/aspeed-video.c
>> @@ -86,8 +86,6 @@
>>    #define  VE_CTRL_SOURCE			BIT(2)
>>    #define  VE_CTRL_INT_DE			BIT(4)
>>    #define  VE_CTRL_DIRECT_FETCH		BIT(5)
>> -#define  VE_CTRL_YUV			BIT(6)
>> -#define  VE_CTRL_RGB			BIT(7)
>>    #define  VE_CTRL_CAPTURE_FMT		GENMASK(7, 6)
>>    #define  VE_CTRL_AUTO_OR_CURSOR		BIT(8)
>>    #define  VE_CTRL_CLK_INVERSE		BIT(11)
>> @@ -202,6 +200,15 @@ enum {
>>    	VIDEO_CLOCKS_ON,
>>    };
>>    
>> +// for VE_CTRL_CAPTURE_FMT
>> +enum aspeed_video_capture_format {
>> +	VIDEO_CAP_FMT_YUV_STUDIO = 0,
> Maybe also append `_SWING`?
>
>> +	VIDEO_CAP_FMT_YUV_FULL,
>> +	VIDEO_CAP_FMT_RGB,
>> +	VIDEO_CAP_FMT_GRAY,
>> +	VIDEO_CAP_FMT_MAX
>> +};
>> +
>>    struct aspeed_video_addr {
>>    	unsigned int size;
>>    	dma_addr_t dma;
>> @@ -1089,7 +1096,8 @@ static void aspeed_video_init_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 = VE_CTRL_AUTO_OR_CURSOR |
>> +		FIELD_PREP(VE_CTRL_CAPTURE_FMT, VIDEO_CAP_FMT_YUV_FULL);
>>    	u32 seq_ctrl = video->jpeg_mode;
>>    
>>    	if (video->frame_rate)
> Reviewed-by: Paul Menzel <pmenzel@...gen.mpg.de>
>
>
> Kind regards,
>
> Paul

-- 
Best Regards
Jammy