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

[Huang Jiachai]

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@xxxxxxxxxxxxxx>
> > ---
> >   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
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