linux-kernel - [PATCH 6.0 189/862] drm/i915: Fix display problems after resume

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Date:   Wed, 19 Oct 2022 10:24:36 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Thomas Hellström 
        <thomas.hellstrom@...ux.intel.com>,
        Matthew Auld <matthew.auld@...el.com>,
        intel-gfx@...ts.freedesktop.org,
        David de Sousa <davidesousa@...il.com>,
        Andrzej Hajda <andrzej.hajda@...el.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...el.com>,
        Kevin Boulain <kevinboulain@...il.com>
Subject: [PATCH 6.0 189/862] drm/i915: Fix display problems after resume

From: Thomas Hellström <thomas.hellstrom@...ux.intel.com>

commit 6c482c62a635aa4f534d2439fbf8afa37452b986 upstream.

Commit 39a2bd34c933 ("drm/i915: Use the vma resource as argument for gtt
binding / unbinding") introduced a regression that due to the vma resource
tracking of the binding state, dpt ptes were not correctly repopulated.
Fix this by clearing the vma resource state before repopulating.
The state will subsequently be restored by the bind_vma operation.

Fixes: 39a2bd34c933 ("drm/i915: Use the vma resource as argument for gtt binding / unbinding")
Signed-off-by: Thomas Hellström <thomas.hellstrom@...ux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220912121957.31310-1-thomas.hellstrom@linux.intel.com
Cc: Matthew Auld <matthew.auld@...el.com>
Cc: intel-gfx@...ts.freedesktop.org
Cc: <stable@...r.kernel.org> # v5.18+
Reported-and-tested-by: Kevin Boulain <kevinboulain@...il.com>
Tested-by: David de Sousa <davidesousa@...il.com>
Reviewed-by: Matthew Auld <matthew.auld@...el.com>
Reviewed-by: Andrzej Hajda <andrzej.hajda@...el.com>
Signed-off-by: Matthew Auld <matthew.auld@...el.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221005121159.340245-1-thomas.hellstrom@linux.intel.com
(cherry picked from commit bc2472538c0d1cce334ffc9e97df0614cd2b1469)
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/gpu/drm/i915/gt/intel_ggtt.c |    8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/i915/gt/intel_ggtt.c
+++ b/drivers/gpu/drm/i915/gt/intel_ggtt.c
@@ -1267,10 +1267,16 @@ bool i915_ggtt_resume_vm(struct i915_add
 			atomic_read(&vma->flags) & I915_VMA_BIND_MASK;
 
 		GEM_BUG_ON(!was_bound);
-		if (!retained_ptes)
+		if (!retained_ptes) {
+			/*
+			 * Clear the bound flags of the vma resource to allow
+			 * ptes to be repopulated.
+			 */
+			vma->resource->bound_flags = 0;
 			vma->ops->bind_vma(vm, NULL, vma->resource,
 					   obj ? obj->cache_level : 0,
 					   was_bound);
+		}
 		if (obj) { /* only used during resume => exclusive access */
 			write_domain_objs |= fetch_and_zero(&obj->write_domain);
 			obj->read_domains |= I915_GEM_DOMAIN_GTT;