From: Cindy H Kao <[email protected]> The default SDIO IOE wait timeout returned from iwmc3200-wimax's CCCR is not efficient. This inefficiency will actually cause problems on Moorestown platforms (system hang).
This is a sillicon bug that requires a software patch to by overwritting func->enable_timeout. The new value I2400MS_IOR_TIMEOUT is recommended and verified from the system integration results. Future sillicon releases will have this default value corrected in the future. Signed-off-by: Cindy H Kao <[email protected]> Signed-off-by: Inaky Perez-Gonzalez <[email protected]> --- drivers/net/wimax/i2400m/i2400m-sdio.h | 2 ++ drivers/net/wimax/i2400m/sdio.c | 8 ++++++++ 2 files changed, 10 insertions(+), 0 deletions(-) diff --git a/drivers/net/wimax/i2400m/i2400m-sdio.h b/drivers/net/wimax/i2400m/i2400m-sdio.h index 66884eb..cfaedfa 100644 --- a/drivers/net/wimax/i2400m/i2400m-sdio.h +++ b/drivers/net/wimax/i2400m/i2400m-sdio.h @@ -81,6 +81,8 @@ enum { I2400MS_INIT_SLEEP_INTERVAL = 10, /* How long to wait for the device to settle after reset */ I2400MS_SETTLE_TIME = 40, + /* The number of msec to wait for IOR after sending IOE */ + IWMC3200_IOR_TIMEOUT = 10, }; diff --git a/drivers/net/wimax/i2400m/sdio.c b/drivers/net/wimax/i2400m/sdio.c index 1429608..0d64d16 100644 --- a/drivers/net/wimax/i2400m/sdio.c +++ b/drivers/net/wimax/i2400m/sdio.c @@ -115,6 +115,14 @@ int i2400ms_enable_function(struct sdio_func *func) err = -ENODEV; while (err != 0 && time_before64(get_jiffies_64(), timeout)) { sdio_claim_host(func); + /* + * There is a sillicon bug on the IWMC3200, where the + * IOE timeout will cause problems on Moorestown + * platforms (system hang). We explicitly overwrite + * func->enable_timeout here to work around the issue. + */ + if (func->device == SDIO_DEVICE_ID_INTEL_IWMC3200WIMAX) + func->enable_timeout = IWMC3200_IOR_TIMEOUT; err = sdio_enable_func(func); if (0 == err) { sdio_release_host(func); -- 1.6.2.5 _______________________________________________ wimax mailing list [email protected] http://lists.linuxwimax.org/listinfo/wimax
