wimax/iwmc3200: overwrite SDIO IOR timeout value to avoid platform hang

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 <cindy.h.kao@intel.com>
Signed-off-by: Inaky Perez-Gonzalez <inaky@linux.intel.com>

diff --git a/drivers/net/wimax/i2400m/i2400m-sdio.h b/drivers/net/wimax/i2400m/i2400m-sdio.h
index 66884eb..cfaedfa 100644 (file)
--- 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 (file)
--- 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);