The patch below does not apply to the 4.19-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-4.19.y git checkout FETCH_HEAD git cherry-pick -x a60ccade88f926e871a57176e86a34bbf0db0098 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2024042353-oversight-despair-5bb8@gregkh' --subject-prefix 'PATCH 4.19.y' HEAD^..
Possible dependencies:
a60ccade88f9 ("drm/vmwgfx: Fix crtc's atomic check conditional") 29b77ad7b9ca ("drm/atomic: Pass the full state to CRTC atomic_check") c489573b5b6c ("Merge drm/drm-next into drm-misc-next")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From a60ccade88f926e871a57176e86a34bbf0db0098 Mon Sep 17 00:00:00 2001 From: Zack Rusin zack.rusin@broadcom.com Date: Thu, 11 Apr 2024 22:55:10 -0400 Subject: [PATCH] drm/vmwgfx: Fix crtc's atomic check conditional
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: 06ec41909e31 ("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.ru...
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c index cd4925346ed4..84ae4e10a2eb 100644 --- a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c @@ -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 &&