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drm/vmwgfx: Fix crtc's atomic check conditional

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The conditional was supposed to prevent enabling of a crtc state
without a set primary plane. Accidently it also prevented disabling
crtc state with a set primary plane. Neither is correct.

Fix the conditional and just driver-warn when a crtc state has been
enabled without a primary plane which will help debug broken userspace.

Fixes IGT's kms_atomic_interruptible and kms_atomic_transition tests.

Signed-off-by: Zack Rusin <zack.rusin@broadcom.com>
Fixes: 06ec41909e ("drm/vmwgfx: Add and connect CRTC helper functions")
Cc: Broadcom internal kernel review list <bcm-kernel-feedback-list@broadcom.com>
Cc: dri-devel@lists.freedesktop.org
Cc: <stable@vger.kernel.org> # v4.12+
Reviewed-by: Ian Forbes <ian.forbes@broadcom.com>
Reviewed-by: Martin Krastev <martin.krastev@broadcom.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240412025511.78553-5-zack.rusin@broadcom.com
This commit is contained in:
Zack Rusin 2024-04-11 22:55:10 -04:00
parent b32233acce
commit a60ccade88
1 changed files with 8 additions and 3 deletions
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11
drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
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@ -933,6 +933,7 @@ int vmw_du_cursor_plane_atomic_check(struct drm_plane *plane,
int vmw_du_crtc_atomic_check(struct drm_crtc *crtc,
struct drm_atomic_state *state)
{
struct vmw_private *vmw = vmw_priv(crtc->dev);
struct drm_crtc_state *new_state = drm_atomic_get_new_crtc_state(state,
crtc);
struct vmw_display_unit *du = vmw_crtc_to_du(new_state->crtc);
@ -940,9 +941,13 @@ int vmw_du_crtc_atomic_check(struct drm_crtc *crtc,
bool has_primary = new_state->plane_mask &
drm_plane_mask(crtc->primary);
/* We always want to have an active plane with an active CRTC */
if (has_primary != new_state->enable)
return -EINVAL;
/*
* This is fine in general, but broken userspace might expect
* some actual rendering so give a clue as why it's blank.
*/
if (new_state->enable && !has_primary)
drm_dbg_driver(&vmw->drm,
"CRTC without a primary plane will be blank.\n");
if (new_state->connector_mask != connector_mask &&