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From: Dmitry Osipenko <dmitry.osipenko@collabora.com>
To: Akihiko Odaki <akihiko.odaki@daynix.com>, Huang Rui <ray.huang@amd.com>,
=?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= <marcandre.lureau@redhat.com>,
=?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= <philmd@linaro.org>,
Gerd Hoffmann <kraxel@redhat.com>,
=?UTF-8?q?Alex=20Benn=C3=A9e?= <alex.bennee@linaro.org>,
Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>,
"Michael S . Tsirkin" <mst@redhat.com>, Paolo Bonzini <pbonzini@redhat.com>
Cc: Gert Wollny <gert.wollny@collabora.com>, qemu-devel@nongnu.org,
Gurchetan Singh <gurchetansingh@chromium.org>, Alyssa Ross <hi@alyssa.is>,
=?UTF-8?q?Roger=20Pau=20Monn=C3=A9?= <roger.pau@citrix.com>,
Alex Deucher <alexander.deucher@amd.com>,
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=?UTF-8?q?Christian=20K=C3=B6nig?= <christian.koenig@amd.com>,
Xenia Ragiadakou <xenia.ragiadakou@amd.com>,
Honglei Huang <honglei1.huang@amd.com>, Julia Zhang <julia.zhang@amd.com>,
Chen Jiqian <Jiqian.Chen@amd.com>, Rob Clark <robdclark@gmail.com>,
Yiwei Zhang <zzyiwei@chromium.org>, Sergio Lopez Pascual <slp@redhat.com>
Subject: [PATCH v7 06/10] ui/sdl2: Don't disable scanout when display is
refreshed
Date: Mon, 3 Feb 2025 02:21:32 +0300
Message-ID: <20250202232136.919342-7-dmitry.osipenko@collabora.com>
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Display refreshment is invoked by a timer and it erroneously disables
the active scanout if it happens to be invoked after scanout has been
enabled. This offending scanout-disable race condition with a timer
can be easily hit when Qemu runs with a disabled vsync by using SDL or
GTK displays (with vblank_mode=3D0 for GTK). Refreshment of display's
content shouldn't disable the active display. Fix it by keeping the
scanout's state unchanged when display is redrawn.
Reviewed-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Tested-by: Alex Benn=C3=A9e <alex.bennee@linaro.org>
Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
---
ui/sdl2-gl.c | 1 -
1 file changed, 1 deletion(-)
diff --git a/ui/sdl2-gl.c b/ui/sdl2-gl.c
index 8d53e340d40d..31f8fbe03286 100644
--- a/ui/sdl2-gl.c
+++ b/ui/sdl2-gl.c
@@ -53,7 +53,6 @@ static void sdl2_gl_render_surface(struct sdl2_console *s=
con)
int ww, wh;
=20
SDL_GL_MakeCurrent(scon->real_window, scon->winctx);
- sdl2_set_scanout_mode(scon, false);
=20
SDL_GetWindowSize(scon->real_window, &ww, &wh);
surface_gl_setup_viewport(scon->gls, scon->surface, ww, wh);
--=20
2.47.1