2012-02-22 06:34:20

by Raja Mani

Subject: [PATCH] ath6kl: Lower SDIO pad drive strength for hw2.1.1 board

From: Raja Mani <[email protected]>

Without this change, SDIO shuts down due to CRC error during
data communication to the firmware in some of the platform.
for example, scan request issued to the firmware doesn't
return scan completed events and cause the socket interface
to always return -16 (device busy).

SDIO pad drive strength should be reduced for hw2.1.1 board
to avoid such errors.

Signed-off-by: Raja Mani <[email protected]>
---
drivers/net/wireless/ath/ath6kl/init.c | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/net/wireless/ath/ath6kl/init.c b/drivers/net/wireless/ath/ath6kl/init.c
index 72f1b4f..6033946 100644
--- a/drivers/net/wireless/ath/ath6kl/init.c
+++ b/drivers/net/wireless/ath/ath6kl/init.c
@@ -1406,7 +1406,8 @@ static int ath6kl_init_upload(struct ath6kl *ar)
return status;

/* WAR to avoid SDIO CRC err */
- if (ar->version.target_ver == AR6003_HW_2_0_VERSION) {
+ if (ar->version.target_ver == AR6003_HW_2_0_VERSION ||
+ ar->version.target_ver == AR6003_HW_2_1_1_VERSION) {
ath6kl_err("temporary war to avoid sdio crc error\n");

param = 0x20;
--
1.7.1

2012-02-28 08:44:58

by Kalle Valo

Subject: Re: [PATCH] ath6kl: Lower SDIO pad drive strength for hw2.1.1 board

On 02/22/2012 08:33 AM, [email protected] wrote:
> From: Raja Mani <[email protected]>
>
> Without this change, SDIO shuts down due to CRC error during
> data communication to the firmware in some of the platform.
> for example, scan request issued to the firmware doesn't
> return scan completed events and cause the socket interface
> to always return -16 (device busy).
>
> SDIO pad drive strength should be reduced for hw2.1.1 board
> to avoid such errors.
>
> Signed-off-by: Raja Mani <[email protected]>

Thanks, applied.

Kalle