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

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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>
This commit is contained in:
Cindy H Kao 2009-08-17 19:17:58 -07:00 committed by Inaky Perez-Gonzalez
parent c30836580b
commit f2696fbdb6
2 changed files with 10 additions and 0 deletions
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2
drivers/net/wimax/i2400m/i2400m-sdio.h
View File

@ -81,6 +81,8 @@ enum {
I2400MS_INIT_SLEEP_INTERVAL = 10, I2400MS_INIT_SLEEP_INTERVAL = 10,
/* How long to wait for the device to settle after reset */ /* How long to wait for the device to settle after reset */
I2400MS_SETTLE_TIME = 40, I2400MS_SETTLE_TIME = 40,
/* The number of msec to wait for IOR after sending IOE */
IWMC3200_IOR_TIMEOUT = 10,
}; };

8
drivers/net/wimax/i2400m/sdio.c
View File

@ -115,6 +115,14 @@ int i2400ms_enable_function(struct sdio_func *func)
err = -ENODEV; err = -ENODEV;
while (err != 0 && time_before64(get_jiffies_64(), timeout)) { while (err != 0 && time_before64(get_jiffies_64(), timeout)) {
sdio_claim_host(func); 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); err = sdio_enable_func(func);
if (0 == err) { if (0 == err) {
sdio_release_host(func); sdio_release_host(func);