This is a note to let you know that I've just added the patch titled

drm/atomic: Add the crtc to affected crtc only if uapi.enable = true

to the 5.16-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summ...

The filename of the patch is: drm-atomic-add-the-crtc-to-affected-crtc-only-if-uapi.enable-true.patch and it can be found in the queue-5.16 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From 5ec1cebd59300ddd26dbaa96c17c508764eef911 Mon Sep 17 00:00:00 2001

From: Manasi Navare manasi.d.navare@intel.com Date: Mon, 4 Oct 2021 04:59:13 -0700 Subject: drm/atomic: Add the crtc to affected crtc only if uapi.enable = true MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit

From: Manasi Navare manasi.d.navare@intel.com

commit 5ec1cebd59300ddd26dbaa96c17c508764eef911 upstream.

In case of a modeset where a mode gets split across multiple CRTCs in the driver specific implementation (bigjoiner in i915) we wrongly count the affected CRTCs based on the drm_crtc_mask and indicate the stolen CRTC as an affected CRTC in atomic_check_only(). This triggers a warning since affected CRTCs doent match requested CRTC.

To fix this in such bigjoiner configurations, we should only increment affected crtcs if that CRTC is enabled in UAPI not if it is just used internally in the driver to split the mode.

v3: Add the same uapi crtc_state->enable check in requested crtc calc (Ville)

Cc: Ville Syrjälä ville.syrjala@linux.intel.com Cc: Simon Ser contact@emersion.fr Cc: Pekka Paalanen pekka.paalanen@collabora.co.uk Cc: Daniel Stone daniels@collabora.com Cc: Daniel Vetter daniel.vetter@intel.com Cc: dri-devel@lists.freedesktop.org Cc: stable@vger.kernel.org # v5.11+ Fixes: 919c2299a893 ("drm/i915: Enable bigjoiner") Signed-off-by: Manasi Navare manasi.d.navare@intel.com Reviewed-by: Ville Syrjälä ville.syrjala@linux.intel.com Link: https://patchwork.freedesktop.org/patch/msgid/20211004115913.23889-1-manasi.... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpu/drm/drm_atomic.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-)

--- a/drivers/gpu/drm/drm_atomic.c +++ b/drivers/gpu/drm/drm_atomic.c @@ -1310,8 +1310,10 @@ int drm_atomic_check_only(struct drm_ato

DRM_DEBUG_ATOMIC("checking %p\n", state);

- for_each_new_crtc_in_state(state, crtc, new_crtc_state, i) - requested_crtc |= drm_crtc_mask(crtc); + for_each_new_crtc_in_state(state, crtc, new_crtc_state, i) { + if (new_crtc_state->enable) + requested_crtc |= drm_crtc_mask(crtc); + }

for_each_oldnew_plane_in_state(state, plane, old_plane_state, new_plane_state, i) { ret = drm_atomic_plane_check(old_plane_state, new_plane_state); @@ -1360,8 +1362,10 @@ int drm_atomic_check_only(struct drm_ato } }

- for_each_new_crtc_in_state(state, crtc, new_crtc_state, i) - affected_crtc |= drm_crtc_mask(crtc); + for_each_new_crtc_in_state(state, crtc, new_crtc_state, i) { + if (new_crtc_state->enable) + affected_crtc |= drm_crtc_mask(crtc); + }

/* * For commits that allow modesets drivers can add other CRTCs to the

Patches currently in stable-queue which might be from manasi.d.navare@intel.com are

queue-5.16/drm-atomic-add-the-crtc-to-affected-crtc-only-if-uapi.enable-true.patch