diff options
Diffstat (limited to 'drivers/staging/octeon-usb')
| -rw-r--r-- | drivers/staging/octeon-usb/octeon-hcd.c | 30 |
1 files changed, 27 insertions, 3 deletions
diff --git a/drivers/staging/octeon-usb/octeon-hcd.c b/drivers/staging/octeon-usb/octeon-hcd.c index 27acab217d21..d71ae297c36f 100644 --- a/drivers/staging/octeon-usb/octeon-hcd.c +++ b/drivers/staging/octeon-usb/octeon-hcd.c @@ -697,15 +697,20 @@ static int cvmx_usb_shutdown(struct cvmx_usb_state *usb) * other access to the Octeon USB port is made. The port starts * off in the disabled state. * + * @dev: Pointer to struct device for logging purposes. * @usb: Pointer to struct cvmx_usb_state. * * Returns: 0 or a negative error code. */ -static int cvmx_usb_initialize(struct cvmx_usb_state *usb) +static int cvmx_usb_initialize(struct device *dev, + struct cvmx_usb_state *usb) { + int retries = 0; union cvmx_usbnx_clk_ctl usbn_clk_ctl; + union cvmx_usbcx_gintsts usbc_gintsts; union cvmx_usbnx_usbp_ctl_status usbn_usbp_ctl_status; +retry: /* * Power On Reset and PHY Initialization * @@ -952,7 +957,26 @@ static int cvmx_usb_initialize(struct cvmx_usb_state *usb) cvmx_fifo_setup(usb); - return 0; + /* + * If the controller is getting port events right after the reset, it + * means the initialization failed. Try resetting the controller again + * in such case. This is seen to happen after cold boot on DSR-1000N. + */ + usbc_gintsts.u32 = cvmx_usb_read_csr32(usb, + CVMX_USBCX_GINTSTS(usb->index)); + cvmx_usb_write_csr32(usb, CVMX_USBCX_GINTSTS(usb->index), + usbc_gintsts.u32); + dev_dbg(dev, "gintsts after reset: 0x%x\n", (int)usbc_gintsts.u32); + if (!usbc_gintsts.s.disconnint && !usbc_gintsts.s.prtint) + return 0; + if (retries++ >= 5) + return -EAGAIN; + dev_info(dev, "controller reset failed (gintsts=0x%x) - retrying\n", + (int)usbc_gintsts.u32); + msleep(50); + cvmx_usb_shutdown(usb); + msleep(50); + goto retry; } /** @@ -3690,7 +3714,7 @@ static int octeon_usb_probe(struct platform_device *pdev) priv->usb.idle_hardware_channels = 0xff; } - status = cvmx_usb_initialize(&priv->usb); + status = cvmx_usb_initialize(dev, &priv->usb); if (status) { dev_dbg(dev, "USB initialization failed with %d\n", status); kfree(hcd); |