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usb: renesas_usbhs: Don't disable the pipe if Control write status stage

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This patch fixes an issue that sometimes this controller is not able
to complete the Control write status stage.

This driver should enable DCPCTR.CCPL and PID_BUF to complete the status
stage. However, if this driver detects the ctrl_stage interruption first
before the control write data is received, this driver will clear the
PID_BUF wrongly in the usbhsf_pio_try_pop(). To avoid this issue, this
patch doesn't clear the PID_BUF in the usbhsf_pio_try_pop().
(Since also the privious code doesn't disable the PID_BUF after a control
 transfer was finished, this patch doesn't have any side efforts.)

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Yoshihiro Shimoda 2015-05-26 20:13:43 +09:00 committed by Greg Kroah-Hartman
parent 5e582ff309
commit c5d496ad98
1 changed files with 8 additions and 1 deletions
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9
drivers/usb/renesas_usbhs/fifo.c
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@ -678,7 +678,14 @@ static int usbhsf_pio_try_pop(struct usbhs_pkt *pkt, int *is_done)
*is_done = 1;
usbhsf_rx_irq_ctrl(pipe, 0);
usbhs_pipe_running(pipe, 0);
usbhs_pipe_disable(pipe); /* disable pipe first */
/*
* If function mode, since this controller is possible to enter
* Control Write status stage at this timing, this driver
* should not disable the pipe. If such a case happens, this
* controller is not able to complete the status stage.
*/
if (!usbhs_mod_is_host(priv) && !usbhs_pipe_is_dcp(pipe))
usbhs_pipe_disable(pipe); /* disable pipe first */
}
/*