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authorYoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>2017-09-27 12:47:13 +0300
committerFelipe Balbi <felipe.balbi@linux.intel.com>2017-09-28 12:35:01 +0300
commit0a2ce62b61f2c76d0213edf4e37aaf54a8ddf295 (patch)
treedec09818e2c0ad2ccaac61d0ce9c202a882bcc64 /drivers/usb
parent6124607acc88fffeaadf3aacfeb3cc1304c87387 (diff)
downloadlinux-0a2ce62b61f2c76d0213edf4e37aaf54a8ddf295.tar.xz
usb: renesas_usbhs: fix usbhsf_fifo_clear() for RX direction
This patch fixes an issue that the usbhsf_fifo_clear() is possible to cause 10 msec delay if the pipe is RX direction and empty because the FRDY bit will never be set to 1 in such case. Fixes: e8d548d54968 ("usb: renesas_usbhs: fifo became independent from pipe.") Cc: <stable@vger.kernel.org> # v3.1+ Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/renesas_usbhs/fifo.c13
1 files changed, 11 insertions, 2 deletions
diff --git a/drivers/usb/renesas_usbhs/fifo.c b/drivers/usb/renesas_usbhs/fifo.c
index 03cac07f57b5..68f26904c316 100644
--- a/drivers/usb/renesas_usbhs/fifo.c
+++ b/drivers/usb/renesas_usbhs/fifo.c
@@ -284,8 +284,17 @@ static void usbhsf_fifo_clear(struct usbhs_pipe *pipe,
struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
int ret = 0;
- if (!usbhs_pipe_is_dcp(pipe))
- ret = usbhsf_fifo_barrier(priv, fifo);
+ if (!usbhs_pipe_is_dcp(pipe)) {
+ /*
+ * This driver checks the pipe condition first to avoid -EBUSY
+ * from usbhsf_fifo_barrier() with about 10 msec delay in
+ * the interrupt handler if the pipe is RX direction and empty.
+ */
+ if (usbhs_pipe_is_dir_in(pipe))
+ ret = usbhs_pipe_is_accessible(pipe);
+ if (!ret)
+ ret = usbhsf_fifo_barrier(priv, fifo);
+ }
/*
* if non-DCP pipe, this driver should set BCLR when