Hi Luciano,
I've had the wl1271 working for the most part on an Atmel
micro-controller, but I've been fighting with a bug for the past couple
of days.
The problem happens whenever I try to transmit large packets of data
(using iperf, or nc, etc) the driver would hang and no longer be able to
send packets. tx_queue_len in the debugfs would then grow as I tried to
send packets but nothing would actually be sent to the device. At the
same time receiving packets would consistently work all of the time.
When this occurred I usually got the following messages:
atmel_mci atmel_mci.0: data CRC error
wl1271: ERROR sdio write failed (-84) - addr 0x14fd8, 1076 bytes, 1
(Note: I added the bit at the end of the wl1271 write failed message in
order to try and debug this problem.)
Upon further investigation I found that any calls to sdio_writesb with a
length greater than or equal to 1024 will occasionally fail with a data
CRC error and this would cause the device to stop working.
I have also found that the following ugly hack in wl1271_sdio_raw_write
seems to fix the problem:
if (len <= 1000) {
ret = sdio_writesb(func, addr, buf, len);
} else {
ret = sdio_writesb(func, addr, buf, 1000);
ret |= sdio_writesb(func, addr, &buf[1000], len-1000);
}
Based on the above, I am currently thinking there may be a bug in the
atmel-mci driver that causes this problem. Therefore, I will likely
contact that driver's maintainer next. I was just hoping to get your
insight in case there is something I am missing on the wl1271 side.
Thanks,
Logan
--
To unsubscribe from this list: send the line "unsubscribe linux-wireless" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
