[v2] ath10k: Handle "invalid" BDFs for msm8998 devices

Commit Message

Jeffrey Hugo Nov. 13, 2019, 3:46 p.m. UTC

When the BDF download QMI message has the end field set to 1, it signals
the end of the transfer, and triggers the firmware to do a CRC check.  The
BDFs for msm8998 devices fail this check, yet the firmware is happy to
still use the BDF.  It appears that this error is not caught by the
downstream drive by concidence, therefore there are production devices
in the field where this issue needs to be handled otherwise we cannot
support wifi on them.  So, attempt to detect this scenario as best we can
and treat it as non-fatal.

Signed-off-by: Jeffrey Hugo <[e-mail]>
Reviewed-by: Bjorn Andersson <[e-mail]>
---

v2:
-tweak conditional nesting
-add comment in code to clarify

 drivers/net/wireless/ath/ath10k/qmi.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

Comments

Kalle Valo Nov. 25, 2019, 12:11 p.m. UTC | #1

Jeffrey Hugo <[e-mail]> wrote:

> When the BDF download QMI message has the end field set to 1, it signals
> the end of the transfer, and triggers the firmware to do a CRC check.  The
> BDFs for msm8998 devices fail this check, yet the firmware is happy to
> still use the BDF.  It appears that this error is not caught by the
> downstream drive by concidence, therefore there are production devices
> in the field where this issue needs to be handled otherwise we cannot
> support wifi on them.  So, attempt to detect this scenario as best we can
> and treat it as non-fatal.
> 
> Signed-off-by: Jeffrey Hugo <[e-mail]>
> Reviewed-by: Bjorn Andersson <[e-mail]>
> Signed-off-by: Kalle Valo <[e-mail]>

Patch applied to ath-next branch of ath.git, thanks.

319c2b71041f ath10k: Handle "invalid" BDFs for msm8998 devices

Patch

diff --git a/drivers/net/wireless/ath/ath10k/qmi.c b/drivers/net/wireless/ath/ath10k/qmi.c
index 637f83ef65f8..6df2d3ac5474 100644
--- a/drivers/net/wireless/ath/ath10k/qmi.c
+++ b/drivers/net/wireless/ath/ath10k/qmi.c
@@ -279,7 +279,15 @@  static int ath10k_qmi_bdf_dnld_send_sync(struct ath10k_qmi *qmi)
 		if (ret < 0)
 			goto out;
 
-		if (resp.resp.result != QMI_RESULT_SUCCESS_V01) {
+		/* end = 1 triggers a CRC check on the BDF.  If this fails, we
+		 * get a QMI_ERR_MALFORMED_MSG_V01 error, but the FW is still
+		 * willing to use the BDF.  For some platforms, all the valid
+		 * released BDFs fail this CRC check, so attempt to detect this
+		 * scenario and treat it as non-fatal.
+		 */
+		if (resp.resp.result != QMI_RESULT_SUCCESS_V01 &&
+		    !(req->end == 1 &&
+		      resp.resp.result == QMI_ERR_MALFORMED_MSG_V01)) {
 			ath10k_err(ar, "failed to download board data file: %d\n",
 				   resp.resp.error);
 			ret = -EINVAL;