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SubjectRe: [PATCH] usb: mtu3: fix the failure of qmu stop
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Il 19/01/23 04:33, Chunfeng Yun ha scritto:
> This happens when do stress test of uvc stream on/off which will
> enable/disable endpoints. uvc has four tx requests, and may disable
> endpoint between queue tx requests as following:
> enable ep --> start qmu
> queue tx request0
> queue tx request1
> queue tx request2 --> resume qmu
> disable ep --> stop qmu may fail [1]
> queue tx request3 --> will resume qmu, may cause qmu can't work
> when enable ep next time [2]
>
> [1]: when the tx fifo has some data to transmit, and
> try to stop qmu (stop ep) meanwhile resume qmu (queue tx request),
> it may cause stop qmu timeout, then can be fixed by flushing fifo
> when stop qmu.
> [2]: it resumes qmu again, shall stop qmu again.
>
> Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
> Reported-by: Min Guo <min.guo@mediatek.com>

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>


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