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author | Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> | 2017-09-27 12:47:13 +0300 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-10-12 10:18:01 +0300 |
commit | be8077a03a279b4f3ab9dda3d64959d626e3044f (patch) | |
tree | 2e142db0b51d4cc62dcb0505b70277c30ca0a8d7 | |
parent | 98578949897f4f46338870e1995230627fb42081 (diff) | |
download | linux-be8077a03a279b4f3ab9dda3d64959d626e3044f.tar.xz |
usb: renesas_usbhs: fix usbhsf_fifo_clear() for RX direction
commit 0a2ce62b61f2c76d0213edf4e37aaf54a8ddf295 upstream.
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.")
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r-- | drivers/usb/renesas_usbhs/fifo.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/drivers/usb/renesas_usbhs/fifo.c b/drivers/usb/renesas_usbhs/fifo.c index e391f9a7c964..75d9ba91e7c5 100644 --- a/drivers/usb/renesas_usbhs/fifo.c +++ b/drivers/usb/renesas_usbhs/fifo.c @@ -289,8 +289,17 @@ 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 |