From e004f1b7fcfd479632078d1ad24df31884bce0d0 Mon Sep 17 00:00:00 2001
From: Xaver Hugl <xaver.hugl@gmail.com>
Date: Mon, 20 Sep 2021 14:27:05 +0200
Subject: [PATCH] platforms/drm: fix buffer re-using

We don't always have explicit modifiers when we're using AMS

CCBUG: 442677
---
 src/plugins/platforms/drm/drm_pipeline.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/plugins/platforms/drm/drm_pipeline.cpp b/src/plugins/platforms/drm/drm_pipeline.cpp
index eaa2a9c109..0b81bd4028 100644
--- a/src/plugins/platforms/drm/drm_pipeline.cpp
+++ b/src/plugins/platforms/drm/drm_pipeline.cpp
@@ -279,8 +279,9 @@ bool DrmPipeline::checkTestBuffer()
     QSharedPointer<DrmBuffer> buffer;
     // try to re-use buffers if possible.
     const auto &checkBuffer = [this, backend, &buffer](const QSharedPointer<DrmBuffer> &buf){
+        const auto &mods = supportedModifiers(buf->format());
         if (buf->format() == backend->drmFormat()
-            && (!m_gpu->atomicModeSetting() || supportedModifiers(buf->format()).contains(buf->modifier()))
+            && (mods.isEmpty() || mods.contains(buf->modifier()))
             && buf->size() == sourceSize()) {
             buffer = buf;
         }