media: verisilicon: Avoid G2 bus error while decoding H.264 and HEVC

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For the i.MX8MQ platform, there is a hardware limitation: the g1 VPU and
g2 VPU cannot decode simultaneously; otherwise, it will cause below bus
error and produce corrupted pictures, even potentially lead to system hang.

[  110.527986] hantro-vpu 38310000.video-codec: frame decode timed out.
[  110.583517] hantro-vpu 38310000.video-codec: bus error detected.

Therefore, it is necessary to ensure that g1 and g2 operate alternately.
This allows for successful multi-instance decoding of H.264 and HEVC.

To achieve this, g1 and g2 share the same v4l2_m2m_dev, and then the
v4l2_m2m_dev can handle the scheduling.

Fixes: cb5dd5a0fa ("media: hantro: Introduce G2/HEVC decoder")
Cc: stable@vger.kernel.org
Signed-off-by: Ming Qian <ming.qian@oss.nxp.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Co-developed-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>

...

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Ming Qian 2025-12-05 09:54:26 +08:00 • committed by Hans Verkuil

parent db6b97a4f8

commit e0203ddf9a

3 changed files with 49 additions and 3 deletions

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2

drivers/media/platform/verisilicon/hantro.h

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42

drivers/media/platform/verisilicon/hantro_drv.c

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8

drivers/media/platform/verisilicon/imx8m_vpu_hw.c

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