tree 18423397671999746ea8e1cd4d28e8cd99e6da94
parent c8d204b38a558d74fafb6915e2593602b7f4b823
author Bin Liu <b-liu@ti.com> 1483488826 -0600
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1483640285 +0100

usb: musb: core: add clear_ep_rxintr() to musb_platform_ops

During dma teardown for dequque urb, if musb load is high, musb might
generate bogus rx ep interrupt even when the rx fifo is flushed. In such
case any of the follow log messages could happen.

	musb_host_rx 1853: BOGUS RX2 ready, csr 0000, count 0

	musb_host_rx 1936: RX3 dma busy, csr 2020

As mentioned in the current inline comment, clearing ep interrupt in the
teardown path avoids the bogus interrupt.

Clearing ep interrupt is platform dependent, so this patch adds a
platform callback to allow glue driver to clear the ep interrupt.

This bug seems to be existing since the initial driver for musb support,
but I only validated the fix back to v4.1, so only cc stable for v4.1+.

cc: stable@vger.kernel.org # 4.1+
Signed-off-by: Bin Liu <b-liu@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>