On 2023-10-24 14:41, Andy Yan wrote:
> Hi:
>
> On 10/24/23 16:49, Christopher Obbard wrote:
>> 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")
That commit added BGR888 format, the RGB888 format goes back to from
when driver was initially added. This patch depend on a macro that was
introduced later, in commit eb5cb6aa9a72 ("drm/rockchip: vop: add a
series of vop support"). Still think commit 85a359f25388 is best commit
to use in a fixes tag.
Will include a fixes tag for 85a359f25388 in v2.
>>
>>> ---
>>> 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?
>
I will add a comment in v2.
It would be a quirk that apply for all VOP full framework, IP version 3.x,
SoCs so checking VOP_MAJOR seem like a good option.
See commit eb5cb6aa9a72 ("drm/rockchip: vop: add a series of vop support")
for a list of SoCs that use VOP full framework:
Vop Full framework now has following vops:
IP version chipname
3.1 rk3288
3.2 rk3368
3.4 rk3366
3.5 rk3399 big
3.6 rk3399 lit
3.7 rk3228
3.8 rk3328
major version: used for IP structure, Vop full framework is 3,
vop little framework is 2.
There are currently three struct vop_data that is missing version declaration:
- rk3036_vop should use VOP_VERSION(2, 2)
- rk3126_vop should use VOP_VERSION(2, 4)
- rk3188_vop guessing is 2.0/2.1 (same/similar as rk3066)
Since none of them are 3.x / VOP full framework, this patch should only
fix/change behavior for affected 3.x / VOP full framework SoCs.
Regards,
Jonas
>
> Every vop hardware has a version(including VOPB/VOPL), so I think use
> VOP_MAJOR to distinguish is ok. Of course it's better
>
> to add some comments. As for adding some quirk in vop_data, I have the
> idea of adding a table to describe the drm format and it's (rb/uv swap,
> afbc)
>
> capability, but I think this is can be done in the future.
>
>>
>>
>> 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);
>>>
>>> /*
