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| author | Kazuya Mizuguchi <kazuya.mizuguchi.ks@renesas.com> | 2017-10-02 14:01:41 +0900 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-10-18 09:35:39 +0200 |
| commit | f4753e0ae985b5856baf250db2e570e80afdf454 (patch) | |
| tree | ba2e7e0a8b928ed152b752dbd38198fb3d54e668 /drivers/hwmon/lm77.c | |
| parent | 08e1674e82e5ed6bcd942aff14f34e1d08c2f9ce (diff) | |
usb: renesas_usbhs: Fix DMAC sequence for receiving zero-length packet
commit 29c7f3e68eec4ae94d85ad7b5dfdafdb8089f513 upstream.
The DREQE bit of the DnFIFOSEL should be set to 1 after the DE bit of
USB-DMAC on R-Car SoCs is set to 1 after the USB-DMAC received a
zero-length packet. Otherwise, a transfer completion interruption
of USB-DMAC doesn't happen. Even if the driver changes the sequence,
normal operations (transmit/receive without zero-length packet) will
not cause any side-effects. So, this patch fixes the sequence anyway.
Signed-off-by: Kazuya Mizuguchi <kazuya.mizuguchi.ks@renesas.com>
[shimoda: revise the commit log]
Fixes: e73a9891b3a1 ("usb: renesas_usbhs: add DMAEngine support")
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>
Diffstat (limited to 'drivers/hwmon/lm77.c')
0 files changed, 0 insertions, 0 deletions