Patch "drm/atomic: Add the crtc to affected crtc only if uapi.enable = true" has been added to the 5.16-stable tree

[gregkh at linuxfoundation.org]

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=summary

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 at vger.kernel.org> know about it.


>From 5ec1cebd59300ddd26dbaa96c17c508764eef911 Mon Sep 17 00:00:00 2001
From: Manasi Navare <manasi.d.navare at 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
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From: Manasi Navare <manasi.d.navare at 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 at linux.intel.com>
Cc: Simon Ser <contact at emersion.fr>
Cc: Pekka Paalanen <pekka.paalanen at collabora.co.uk>
Cc: Daniel Stone <daniels at collabora.com>
Cc: Daniel Vetter <daniel.vetter at intel.com>
Cc: dri-devel at lists.freedesktop.org
Cc: <stable at vger.kernel.org> # v5.11+
Fixes: 919c2299a893 ("drm/i915: Enable bigjoiner")
Signed-off-by: Manasi Navare <manasi.d.navare at intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211004115913.23889-1-manasi.d.navare@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh at 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 at intel.com are

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