usb: musb: cppi41: improve rx channel abort routine

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commit cb83df77f3 upstream.

1. set AUTOREQ to NONE at the beginning of teardown;

2. add delay for dma pipeline to drain;

3. Do not set USB_TDOWN bit for RX teardown.

  The CPPI hw has an issue that when tearing down a RX channel, if
  another RX channel is receiving data, the CPPI will lockup.

  To workaround the issue, do not set the CPPI TD bit. The steps before
  this point ensures the CPPI channel will be torn down properly.

Signed-off-by: Bin Liu <b-liu@ti.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

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Bin Liu 2015-01-26 16:22:07 -06:00 • committed by Ben Hutchings

parent e8a4f7cbb1

commit 7dc5d81848

1 changed files with 9 additions and 3 deletions

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drivers/usb/musb/musb_cppi41.c

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