[PATCH] amd/display: remove ChromeOS workaround

[Harry Wentland]

On 2021-10-21 13:55, Rodrigo Siqueira Jordao wrote:
> Hi Simon,
> 
> I tested this patch and it lgtm. I also agree to revert it.
> 
> Btw, did you send the revert patch for "amd/display: only require overlay plane to cover whole CRTC on ChromeOS"? I think we need to revert it as well.
> 

Agreed that this patch is good but we'll need to also revert the is_chromeos w/a.

This patch is
Reviewed-by: Harry Wentland <harry.wentland at amd.com>

Harry

> Sean, Mark
> 
> For ChromeOS, we should ignore this patch. Do we need to take any action to avoid landing this patch on ChromeOS tree?
> 
> Thanks
> Siqueira
> 
> On 2021-10-14 11:35 a.m., Simon Ser wrote:
>> This reverts commits ddab8bd788f5 ("drm/amd/display: Fix two cursor duplication
>> when using overlay") and e7d9560aeae5 ("Revert "drm/amd/display: Fix overlay
>> validation by considering cursors"").
>>
>> tl;dr ChromeOS uses the atomic interface for everything except the cursor. This
>> is incorrect and forces amdgpu to disable some hardware features. Let's revert
>> the ChromeOS-specific workaround in mainline and allow the Chrome team to keep
>> it internally in their own tree.
>>
>> See [1] for more details. This patch is an alternative to [2], which added
>> ChromeOS detection.
>>
>> [1]: https://lore.kernel.org/amd-gfx/JIQ_93_cHcshiIDsrMU1huBzx9P9LVQxucx8hQArpQu7Wk5DrCl_vTXj_Q20m_L-8C8A5dSpNcSJ8ehfcCrsQpfB5QG_Spn14EYkH9chtg0=@emersion.fr/>> [2]: https://lore.kernel.org/amd-gfx/20211011151609.452132-1-contact@emersion.fr/>> Signed-off-by: Simon Ser <contact at emersion.fr>
>> Cc: Alex Deucher <alexander.deucher at amd.com>
>> Cc: Harry Wentland <hwentlan at amd.com>
>> Cc: Nicholas Kazlauskas <nicholas.kazlauskas at amd.com>
>> Cc: Bas Nieuwenhuizen <bas at basnieuwenhuizen.nl>
>> Cc: Rodrigo Siqueira <Rodrigo.Siqueira at amd.com>
>> Cc: Sean Paul <seanpaul at chromium.org>
>> Fixes: ddab8bd788f5 ("drm/amd/display: Fix two cursor duplication when using overlay")
>> Fixes: e7d9560aeae5 ("Revert "drm/amd/display: Fix overlay validation by considering cursors"")
>> ---
>>   .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 51 -------------------
>>   1 file changed, 51 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
>> index 20065a145851..014c5a9fe461 100644
>> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
>> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
>> @@ -10628,53 +10628,6 @@ static int add_affected_mst_dsc_crtcs(struct drm_atomic_state *state, struct drm
>>   }
>>   #endif
>>   -static int validate_overlay(struct drm_atomic_state *state)
>> -{
>> -    int i;
>> -    struct drm_plane *plane;
>> -    struct drm_plane_state *new_plane_state;
>> -    struct drm_plane_state *primary_state, *overlay_state = NULL;
>> -
>> -    /* Check if primary plane is contained inside overlay */
>> -    for_each_new_plane_in_state_reverse(state, plane, new_plane_state, i) {
>> -        if (plane->type == DRM_PLANE_TYPE_OVERLAY) {
>> -            if (drm_atomic_plane_disabling(plane->state, new_plane_state))
>> -                return 0;
>> -
>> -            overlay_state = new_plane_state;
>> -            continue;
>> -        }
>> -    }
>> -
>> -    /* check if we're making changes to the overlay plane */
>> -    if (!overlay_state)
>> -        return 0;
>> -
>> -    /* check if overlay plane is enabled */
>> -    if (!overlay_state->crtc)
>> -        return 0;
>> -
>> -    /* find the primary plane for the CRTC that the overlay is enabled on */
>> -    primary_state = drm_atomic_get_plane_state(state, overlay_state->crtc->primary);
>> -    if (IS_ERR(primary_state))
>> -        return PTR_ERR(primary_state);
>> -
>> -    /* check if primary plane is enabled */
>> -    if (!primary_state->crtc)
>> -        return 0;
>> -
>> -    /* Perform the bounds check to ensure the overlay plane covers the primary */
>> -    if (primary_state->crtc_x < overlay_state->crtc_x ||
>> -        primary_state->crtc_y < overlay_state->crtc_y ||
>> -        primary_state->crtc_x + primary_state->crtc_w > overlay_state->crtc_x + overlay_state->crtc_w ||
>> -        primary_state->crtc_y + primary_state->crtc_h > overlay_state->crtc_y + overlay_state->crtc_h) {
>> -        DRM_DEBUG_ATOMIC("Overlay plane is enabled with hardware cursor but does not fully cover primary plane\n");
>> -        return -EINVAL;
>> -    }
>> -
>> -    return 0;
>> -}
>> -
>>   /**
>>    * amdgpu_dm_atomic_check() - Atomic check implementation for AMDgpu DM.
>>    * @dev: The DRM device
>> @@ -10856,10 +10809,6 @@ static int amdgpu_dm_atomic_check(struct drm_device *dev,
>>               goto fail;
>>       }
>>   -    ret = validate_overlay(state);
>> -    if (ret)
>> -        goto fail;
>> -
>>       /* Add new/modified planes */
>>       for_each_oldnew_plane_in_state_reverse(state, plane, old_plane_state, new_plane_state, i) {
>>           ret = dm_update_plane_state(dc, state, plane,
>>
>