This a bus repeater for it913x devices. Commands usually fail because of other activity on the USB bus.
Bulk failures that report -ETIMEDOUT or -EBUSY are repeated. Enpoints that return actlen not equal len request -EAGAIN. The retry is set at 10. Signed-off-by: Malcolm Priestley <[email protected]> --- drivers/media/dvb/dvb-usb/it913x.c | 61 +++++++++++++++++++++++++++++------ 1 files changed, 50 insertions(+), 11 deletions(-) diff --git a/drivers/media/dvb/dvb-usb/it913x.c b/drivers/media/dvb/dvb-usb/it913x.c index d7c86c2..e847527 100644 --- a/drivers/media/dvb/dvb-usb/it913x.c +++ b/drivers/media/dvb/dvb-usb/it913x.c @@ -67,23 +67,43 @@ struct it913x_state { struct ite_config it913x_config; +#define IT913X_RETRY 10 +#define IT913X_SND_TIMEOUT 100 +#define IT913X_RCV_TIMEOUT 200 + static int it913x_bulk_write(struct usb_device *dev, u8 *snd, int len, u8 pipe) { - int ret, actual_l; + int ret, actual_l, i; + + for (i = 0; i < IT913X_RETRY; i++) { + ret = usb_bulk_msg(dev, usb_sndbulkpipe(dev, pipe), + snd, len , &actual_l, IT913X_SND_TIMEOUT); + if (ret == 0 || ret != -EBUSY || ret != -ETIMEDOUT) + break; + } + + if (len != actual_l && ret == 0) + ret = -EAGAIN; - ret = usb_bulk_msg(dev, usb_sndbulkpipe(dev, pipe), - snd, len , &actual_l, 100); return ret; } static int it913x_bulk_read(struct usb_device *dev, u8 *rev, int len, u8 pipe) { - int ret, actual_l; + int ret, actual_l, i; + + for (i = 0; i < IT913X_RETRY; i++) { + ret = usb_bulk_msg(dev, usb_rcvbulkpipe(dev, pipe), + rev, len , &actual_l, IT913X_RCV_TIMEOUT); + if (ret == 0 || ret != -EBUSY || ret != -ETIMEDOUT) + break; + } + + if (len != actual_l && ret == 0) + ret = -EAGAIN; - ret = usb_bulk_msg(dev, usb_rcvbulkpipe(dev, pipe), - rev, len , &actual_l, 200); return ret; } @@ -96,7 +116,7 @@ static u16 check_sum(u8 *p, u8 len) return ~sum; } -static int it913x_io(struct usb_device *udev, u8 mode, u8 pro, +static int it913x_usb_talk(struct usb_device *udev, u8 mode, u8 pro, u8 cmd, u32 reg, u8 addr, u8 *data, u8 len) { int ret = 0, i, buf_size = 1; @@ -155,22 +175,41 @@ static int it913x_io(struct usb_device *udev, u8 mode, u8 pro, buff[buf_size++] = (chk_sum & 0xff); ret = it913x_bulk_write(udev, buff, buf_size , 0x02); + if (ret < 0) + goto error; - ret |= it913x_bulk_read(udev, buff, (mode & 1) ? + ret = it913x_bulk_read(udev, buff, (mode & 1) ? 5 : len + 5 , 0x01); + if (ret < 0) + goto error; rlen = (mode & 0x1) ? 0x1 : len; if (mode & 1) - ret |= buff[2]; + ret = buff[2]; else memcpy(data, &buff[3], rlen); cmd_counter++; - kfree(buff); +error: kfree(buff); - return (ret < 0) ? -ENODEV : 0; + return ret; +} + +static int it913x_io(struct usb_device *udev, u8 mode, u8 pro, + u8 cmd, u32 reg, u8 addr, u8 *data, u8 len) +{ + int ret, i; + + for (i = 0; i < IT913X_RETRY; i++) { + ret = it913x_usb_talk(udev, mode, pro, + cmd, reg, addr, data, len); + if (ret != -EAGAIN) + break; + } + + return ret; } static int it913x_wr_reg(struct usb_device *udev, u8 pro, u32 reg , u8 data) -- 1.7.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
