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Input: atmel_mxt_ts - implement bootloader frame retries 

Signed-off-by: Nick Dyer <nick.dyer@itdev.co.uk>
Acked-by: Benson Leung <bleung@chromium.org>
Acked-by: Yufeng Shen <miletus@chromium.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Nick Dyer 2014-05-18 23:14:20 -07:00 committed by Dmitry Torokhov
parent e57a66aa85
commit f943c74ad8
1 changed files with 20 additions and 7 deletions
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27
drivers/input/touchscreen/atmel_mxt_ts.c
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@ -510,8 +510,12 @@ recheck:
val &= ~MXT_BOOT_STATUS_MASK;
break;
case MXT_FRAME_CRC_PASS:
if (val == MXT_FRAME_CRC_CHECK)
if (val == MXT_FRAME_CRC_CHECK) {
goto recheck;
} else if (val == MXT_FRAME_CRC_FAIL) {
dev_err(dev, "Bootloader CRC fail\n");
return -EINVAL;
}
break;
default:
return -EINVAL;
@ -1187,6 +1191,7 @@ static int mxt_load_fw(struct device *dev, const char *fn)
const struct firmware *fw = NULL;
unsigned int frame_size;
unsigned int pos = 0;
unsigned int retry = 0;
int ret;
ret = request_firmware(&fw, fn, dev);
@ -1224,9 +1229,7 @@ static int mxt_load_fw(struct device *dev, const char *fn)
frame_size = ((*(fw->data + pos) << 8) | *(fw->data + pos + 1));
/* We should add 2 at frame size as the the firmware data is not
* included the CRC bytes.
*/
/* Take account of CRC bytes */
frame_size += 2;
/* Write one frame to device */
@ -1235,10 +1238,20 @@ static int mxt_load_fw(struct device *dev, const char *fn)
goto disable_irq;
ret = mxt_check_bootloader(data, MXT_FRAME_CRC_PASS);
if (ret)
goto disable_irq;
if (ret) {
retry++;
pos += frame_size;
/* Back off by 20ms per retry */
msleep(retry * 20);
if (retry > 20) {
dev_err(dev, "Retry count exceeded\n");
goto disable_irq;
}
} else {
retry = 0;
pos += frame_size;
}
dev_dbg(dev, "Updated %d bytes / %zd bytes\n", pos, fw->size);
}