Hi Jonas,
On Mon, 2023-10-23 at 21:11 +0000, Jonas Karlman wrote:
> Use of DRM_FORMAT_RGB888 and DRM_FORMAT_BGR888 on e.g. RK3288, RK3328
> and RK3399 result in wrong colors being displayed.
>
> The issue can be observed using modetest:
>
> modetest -s <connector_id>@<crtc_id>:1920x1080-60@RG24
> modetest -s <connector_id>@<crtc_id>:1920x1080-60@BG24
>
> Vendor 4.4 kernel apply an inverted rb swap for these formats on VOP
> full (major = 3).
>
> Fix colors by applying rb swap similar to vendor 4.4 kernel.
>
> Signed-off-by: Jonas Karlman <jonas@xxxxxxxxx>
How about a fixes tag? Seems like this was introduced in commit 85a359f25388
("drm/rockchip: Add BGR formats to VOP")
> ---
> drivers/gpu/drm/rockchip/rockchip_drm_vop.c | 9 ++++++---
> 1 file changed, 6 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
> b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
> index b3d0b6ae9294..a1ce09a22f83 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
> @@ -247,14 +247,17 @@ static inline void vop_cfg_done(struct vop *vop)
> VOP_REG_SET(vop, common, cfg_done, 1);
> }
>
> -static bool has_rb_swapped(uint32_t format)
> +static bool has_rb_swapped(uint32_t version, uint32_t format)
> {
> switch (format) {
> case DRM_FORMAT_XBGR8888:
> case DRM_FORMAT_ABGR8888:
> - case DRM_FORMAT_BGR888:
> case DRM_FORMAT_BGR565:
> return true;
> + case DRM_FORMAT_RGB888:
> + return VOP_MAJOR(version) == 3;
> + case DRM_FORMAT_BGR888:
> + return VOP_MAJOR(version) != 3;
The hardcoded bits are quite scary as it applies to all hardware variants ;-).
Is it worth adding an inline comment to describe what is going on and how it
relates to VOPL and VOPH? Or would it be even better to add this as a quirk in
the various vop_data structs?
Cheers!
Chris
> default:
> return false;
> }
> @@ -1035,7 +1038,7 @@ static void vop_plane_atomic_update(struct drm_plane
> *plane,
> VOP_WIN_SET(vop, win, dsp_info, dsp_info);
> VOP_WIN_SET(vop, win, dsp_st, dsp_st);
>
> - rb_swap = has_rb_swapped(fb->format->format);
> + rb_swap = has_rb_swapped(vop->data->version, fb->format->format);
> VOP_WIN_SET(vop, win, rb_swap, rb_swap);
>
> /*
