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([43.242.224.196]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-327f9209f51sm58375372eec.22.2026.08.25.03.54.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 25 Aug 2026 03:54:54 -0700 (PDT) From: Roshan Kumar To: linusw@kernel.org, dri-devel@lists.freedesktop.org Cc: leandro.ribeiro@collabora.com, maarten.lankhorst@linux.intel.com, mripard@kernel.org, tzimmermann@suse.de, airlied@gmail.com, simona@ffwll.ch, pimyn@google.com, linux-kernel@vger.kernel.org, roshaen09@gmail.com Subject: [PATCH] drm/pl111: Advertise no pixel blending Date: Tue, 25 Aug 2026 16:24:26 +0530 Message-ID: <20260825105427.686619-1-roshaen09@gmail.com> X-Mailer: git-send-email 2.43.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Mailman-Approved-At: Tue, 25 Aug 2026 14:35:48 +0000 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Commit 860e748bddcc ("drm: ensure blend mode supported if pixel format with alpha exposed") added validation that warns when a plane exposes an alpha format without a pixel blend mode property. PL111 exposes several such formats but does not attach the property. The PL110/PL111 controller scans out a single framebuffer and does not blend its alpha channel with a background. Advertise DRM_MODE_BLEND_PIXEL_NONE to match the existing hardware behavior. With panic_on_warn enabled, this warning prevents the syzkaller vexpress-a15 manager from booting. The change was tested on current master with QEMU 10 and the existing production DTB; the guest reached sshd and returned an SSH banner. Fixes: 860e748bddcc ("drm: ensure blend mode supported if pixel format with alpha exposed") Link: https://github.com/google/syzkaller/issues/7805 Signed-off-by: Roshan Kumar --- drivers/gpu/drm/pl111/pl111_display.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/gpu/drm/pl111/pl111_display.c b/drivers/gpu/drm/pl111/pl111_display.c index 5d10bc5..758b297 100644 --- a/drivers/gpu/drm/pl111/pl111_display.c +++ b/drivers/gpu/drm/pl111/pl111_display.c @@ -15,6 +15,7 @@ #include #include +#include #include #include #include @@ -596,5 +597,10 @@ int pl111_display_init(struct drm_device *drm) if (ret) return ret; + ret = drm_plane_create_blend_mode_property(&priv->pipe.plane, + BIT(DRM_MODE_BLEND_PIXEL_NONE)); + if (ret) + return ret; + return 0; } -- 2.43.0