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authorBin Liu <b-liu@ti.com>2015-08-24 23:28:37 +0300
committerFelipe Balbi <balbi@ti.com>2015-09-21 22:42:36 +0300
commitb431ba8803666e56c1d178a421b3cbc36e8d3d33 (patch)
tree6a1efd432f7b976bd80cd89fb8bfb4c7df5459ac /drivers/usb/musb/musb_cppi41.c
parent8fb7ab504381b8ce4f443129e102a713bd76dfe2 (diff)
downloadlinux-b431ba8803666e56c1d178a421b3cbc36e8d3d33.tar.xz
usb: musb: fix cppi channel teardown for isoch transfer
After a few iterations of start/stop UVC camera streaming, the streaming stops. This patch adds 250us delay in the cppi channel abort path to let cppi drain properly. Using 50us delay seems to be too aggressive, some webcams are still broken. 250us is the original value used in TI 3.2 kernel. Signed-off-by: Bin Liu <b-liu@ti.com> Signed-off-by: Felipe Balbi <balbi@ti.com>
Diffstat (limited to 'drivers/usb/musb/musb_cppi41.c')
-rw-r--r--drivers/usb/musb/musb_cppi41.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/usb/musb/musb_cppi41.c b/drivers/usb/musb/musb_cppi41.c
index d07cafb7d5f5..e499b862a946 100644
--- a/drivers/usb/musb/musb_cppi41.c
+++ b/drivers/usb/musb/musb_cppi41.c
@@ -551,6 +551,9 @@ static int cppi41_dma_channel_abort(struct dma_channel *channel)
} else {
cppi41_set_autoreq_mode(cppi41_channel, EP_MODE_AUTOREQ_NONE);
+ /* delay to drain to cppi dma pipeline for isoch */
+ udelay(250);
+
csr = musb_readw(epio, MUSB_RXCSR);
csr &= ~(MUSB_RXCSR_H_REQPKT | MUSB_RXCSR_DMAENAB);
musb_writew(epio, MUSB_RXCSR, csr);