diff options
| author | Jason-JH Lin <jason-jh.lin@mediatek.com> | 2025-06-24 19:31:41 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-07-24 08:58:40 +0200 |
| commit | a9c482689051ca96f4a4630fe49fd6919694caaa (patch) | |
| tree | 6b7e67a4589428fec0e9cf03d373d653c910ab56 /net/lapb/lapb_timer.c | |
| parent | ff51ef387fcfe7bc4903cec0b43c9b1f04960a15 (diff) | |
drm/mediatek: Add wait_event_timeout when disabling plane
[ Upstream commit d208261e9f7c66960587b10473081dc1cecbe50b ]
Our hardware registers are set through GCE, not by the CPU.
DRM might assume the hardware is disabled immediately after calling
atomic_disable() of drm_plane, but it is only truly disabled after the
GCE IRQ is triggered.
Additionally, the cursor plane in DRM uses async_commit, so DRM will
not wait for vblank and will free the buffer immediately after calling
atomic_disable().
To prevent the framebuffer from being freed before the layer disable
settings are configured into the hardware, which can cause an IOMMU
fault error, a wait_event_timeout has been added to wait for the
ddp_cmdq_cb() callback,indicating that the GCE IRQ has been triggered.
Fixes: 2f965be7f900 ("drm/mediatek: apply CMDQ control flow")
Signed-off-by: Jason-JH Lin <jason-jh.lin@mediatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: CK Hu <ck.hu@mediatek.com>
Link: https://patchwork.kernel.org/project/linux-mediatek/patch/20250624113223.443274-1-jason-jh.lin@mediatek.com/
Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'net/lapb/lapb_timer.c')
0 files changed, 0 insertions, 0 deletions