linux-kernel - Re: [PATCH] drm/rockchip: vop: fix vop full rgb24 r/b color error

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Message-ID: <0fe318e7-2f35-d311-ff3a-b67cc527cc87@rock-chips.com>
Date:   Fri, 19 Jun 2020 16:39:09 +0800
From:   Huang Jiachai <hjc@...k-chips.com>
To:     Heiko Stuebner <heiko@...ech.de>
Cc:     David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        andy.yan@...k-chips.com, huangtao@...k-chips.com,
        dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/rockchip: vop: fix vop full rgb24 r/b color error

Hi heiko,

在 2020/6/19 15:02, Heiko Stuebner 写道:
> Hi Sandy,
>
> Am Freitag, 19. Juni 2020, 04:12:51 CEST schrieb Sandy Huang:
>> RGB888 format msb is red component and the lsb is blue component,
>> at vop full platform this is swapped, and this is different from vop
>> lite and vop next, so add this patch to fix it.
> just me struggling with color formats ... and wondering why this never
> came up so far - with Version 3 being all major SoCs of the last years.
>
> So I guess the reason that nobody noticed so far is, that most things
> will use ARGB888 instead of RGB888?
yes, most gpu output format is ARGB888, so we didn't noticed it before.
> One implementation nit below as well.
>
>> Signed-off-by: Sandy Huang <hjc@...k-chips.com>
>> ---
>>   drivers/gpu/drm/rockchip/rockchip_drm_vop.c | 8 ++++++++
>>   1 file changed, 8 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
>> index c80f7d9fd13f..1c17048ad737 100644
>> --- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
>> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
>> @@ -132,6 +132,7 @@ struct vop_win {
>>   
>>   struct rockchip_rgb;
>>   struct vop {
>> +	uint32_t version;
>>   	struct drm_crtc crtc;
>>   	struct device *dev;
>>   	struct drm_device *drm_dev;
>> @@ -989,6 +990,12 @@ static void vop_plane_atomic_update(struct drm_plane *plane,
>>   	VOP_WIN_SET(vop, win, dsp_st, dsp_st);
>>   
>>   	rb_swap = has_rb_swapped(fb->format->format);
>> +	/*
>> +	 * VOP full need to do rb swap to show rgb888/bgr888 format color correctly
>> +	 */
> one-line-comment?
> 	/* VOP-full needs rb_swap for correctly showing rgb888/bgr888 */
>
>> +	if ((fb->format->format == DRM_FORMAT_RGB888 || fb->format->format == DRM_FORMAT_BGR888) &&
>> +	    VOP_MAJOR(vop->version) == 3)
>> +		rb_swap = !rb_swap;
> can we move this into the existing has_rb_swapped() function?
> Like doing
> 	rb_swap = has_rb_swapped(vop, fb->format->format)
> and adding your conditional to the end there?
>
OK, update at v2.
> Thanks
> Heiko
>
>
>>   	VOP_WIN_SET(vop, win, rb_swap, rb_swap);
>>   
>>   	/*
>> @@ -2091,6 +2098,7 @@ static int vop_bind(struct device *dev, struct device *master, void *data)
>>   	vop->dev = dev;
>>   	vop->data = vop_data;
>>   	vop->drm_dev = drm_dev;
>> +	vop->version = vop_data->version;
>>   	dev_set_drvdata(dev, vop);
>>   
>>   	vop_win_init(vop);
>>
>
>
>
>
>
-- 
Best Regard

黄家钗
Sandy Huang
Addr: 福州市鼓楼区铜盘路软件大道89号福州软件园A区21号楼(350003)
       No. 21 Building, A District, No.89,software Boulevard Fuzhou,Fujian,PRC
Tel：+86 0591-87884919  8690
E-mail：hjc@...k-chips.com