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mmc: dw_mmc: Increase cmd11 timeout to 500ms 

Although the cmd11 interrupt should come within 2ms, that's a very
short time.  Let's increase the timeout to be really sure that we
don't get an accidnetal timeout.  One case in particular this is
useful is if you've got a serial console and printk in just the right
places.  Under that scenario I've seen delays of up to 130ms before
the interrupt fired.

CMD11 is only sent during card insertion, so this extra timeout
shouldn't be terrible.

Fixes: 5c935165da ("mmc: dw_mmc: Add a timeout for sending CMD11")
Signed-off-by: Doug Anderson <dianders@chromium.org>
Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Doug Anderson 2015-04-03 11:13:05 -07:00 committed by Ulf Hansson
parent 76184ac17e
commit 8886a6fd19
1 changed files with 5 additions and 3 deletions
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8
drivers/mmc/host/dw_mmc.c
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@ -1024,11 +1024,13 @@ static void __dw_mci_start_request(struct dw_mci *host,
if (cmd->opcode == SD_SWITCH_VOLTAGE) { if (cmd->opcode == SD_SWITCH_VOLTAGE) {
/* /*
* Databook says to fail after 2ms w/ no response; give an * Databook says to fail after 2ms w/ no response, but evidence
* extra jiffy just in case we're about to roll over. * shows that sometimes the cmd11 interrupt takes over 130ms.
* We'll set to 500ms, plus an extra jiffy just in case jiffies
* is just about to roll over.
*/ */
mod_timer(&host->cmd11_timer, mod_timer(&host->cmd11_timer,
jiffies + msecs_to_jiffies(2) + 1); jiffies + msecs_to_jiffies(500) + 1);
} }
if (mrq->stop) if (mrq->stop)