diff options
| author | Alexandre Bailon <abailon@baylibre.com> | 2017-04-17 07:21:18 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-04-18 17:48:26 +0300 |
| commit | 593bc4622a98c172dbb939103aef917d1800a663 (patch) | |
| tree | 536382265b31a66d28d13dba2af10f8746af3c87 /drivers/usb/musb/musb_cppi41.c | |
| parent | d6299b6efbf66c27d2d8cda009e6d49b53dc4cfe (diff) | |
| download | linux-593bc4622a98c172dbb939103aef917d1800a663.tar.xz | |
usb: musb: musb_cppi41: Workaround DMA stall issue during teardown
The DMA may hang up if a teardown is initiated while an endpoint is still
active (Advisory 2.3.27 of DA8xx errata).
To workaround this issue, add a delay before to initiate the teardown.
Signed-off-by: Alexandre Bailon <abailon@baylibre.com>
Signed-off-by: Bin Liu <b-liu@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/musb/musb_cppi41.c')
| -rw-r--r-- | drivers/usb/musb/musb_cppi41.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/usb/musb/musb_cppi41.c b/drivers/usb/musb/musb_cppi41.c index 355655f8a3fb..e7c8b1b8bf22 100644 --- a/drivers/usb/musb/musb_cppi41.c +++ b/drivers/usb/musb/musb_cppi41.c @@ -571,6 +571,10 @@ static int cppi41_dma_channel_abort(struct dma_channel *channel) } } + /* DA8xx Advisory 2.3.27: wait 250 ms before to start the teardown */ + if (musb->io.quirks & MUSB_DA8XX) + mdelay(250); + tdbit = 1 << cppi41_channel->port_num; if (is_tx) tdbit <<= 16; |