On 2017-03-01 20:40:04 [-0600], Bin Liu wrote:
> The CPPI41 driver polls register to workaround the pre-mature TX
> interrupt issue, but it causes audio playback underrun when triggered in
> Isoch transfers.
>
> Isoch doesn't do back-to-back transfers, the TX should be done by the
> time the next transfer is scheduled. So skip this polling workaround for
> Isoch transfer.
>
> Fixes: a655f481d83d6 ("usb: musb: musb_cppi41: handle pre-mature TX complete interrupt")
> Cc: <stable@xxxxxxxxxxxxxxx> #4.1+
> Reported-by: Alexandre Bailon <abailon@xxxxxxxxxxxx>
> Signed-off-by: Bin Liu <b-liu@xxxxxx>
Looks reasonable.
Acked-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
Sebastian
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