Commit 8886a6fd authored Apr 03, 2015 by Doug Anderson Committed by Ulf Hansson Apr 09, 2015

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: 5c935165 ("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>

parent 76184ac1

drivers/mmc/host/dw_mmc.c

+5 −3

Original line number	Diff line number	Diff line
		@@ -1024,11 +1024,13 @@ static void __dw_mci_start_request(struct dw_mci *host,

		if (cmd->opcode == SD_SWITCH_VOLTAGE) {
		/*
		* Databook says to fail after 2ms w/ no response; give an
		* extra jiffy just in case we're about to roll over.
		* Databook says to fail after 2ms w/ no response, but evidence
		* 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,
		jiffies + msecs_to_jiffies(2) + 1);
		jiffies + msecs_to_jiffies(500) + 1);
		}

		if (mrq->stop)