Patch "mmc: sdhci: Fix override of timeout clk wrt max_busy_timeout" has been added to the 4.4-stable tree

Patch "mmc: sdhci: Fix override of timeout clk wrt max_busy_timeout" has been added to the 4.4-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    mmc: sdhci: Fix override of timeout clk wrt max_busy_timeout

to the 4.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     mmc-sdhci-fix-override-of-timeout-clk-wrt-max_busy_timeout.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 995136247915c5cee633d55ba23f6eebf67aa567 Mon Sep 17 00:00:00 2001
From: Adrian Hunter <adrian.hunter@intel.com>
Date: Mon, 7 Mar 2016 13:33:55 +0200
Subject: mmc: sdhci: Fix override of timeout clk wrt max_busy_timeout

From: Adrian Hunter <adrian.hunter@intel.com>

commit 995136247915c5cee633d55ba23f6eebf67aa567 upstream.

Normally the timeout clock frequency is read from the capabilities
register.  It is also possible to set the value prior to calling
sdhci_add_host() in which case that value will override the
capabilities register value.  However that was being done after
calculating max_busy_timeout so that max_busy_timeout was being
calculated using the wrong value of timeout_clk.

Fix that by moving the override before max_busy_timeout is
calculated.

The result is that the max_busy_timeout and max_discard
increase for BSW devices so that, for example, the time for
mkfs.ext4 on a 64GB eMMC drops from about 1 minute 40 seconds
to about 20 seconds.

Note, in the future, the capabilities setting will be tidied up
and this override won't be used anymore.  However this fix is
needed for stable.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/mmc/host/sdhci.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -3106,14 +3106,14 @@ int sdhci_add_host(struct sdhci_host *ho
 		if (caps[0] & SDHCI_TIMEOUT_CLK_UNIT)
 			host->timeout_clk *= 1000;
 
+		if (override_timeout_clk)
+			host->timeout_clk = override_timeout_clk;
+
 		mmc->max_busy_timeout = host->ops->get_max_timeout_count ?
 			host->ops->get_max_timeout_count(host) : 1 << 27;
 		mmc->max_busy_timeout /= host->timeout_clk;
 	}
 
-	if (override_timeout_clk)
-		host->timeout_clk = override_timeout_clk;
-
 	mmc->caps |= MMC_CAP_SDIO_IRQ | MMC_CAP_ERASE | MMC_CAP_CMD23;
 	mmc->caps2 |= MMC_CAP2_SDIO_IRQ_NOTHREAD;
 


Patches currently in stable-queue which might be from adrian.hunter@intel.com are

queue-4.4/perf-tools-fix-checking-asprintf-return-value.patch
queue-4.4/mmc-sdhci-fix-override-of-timeout-clk-wrt-max_busy_timeout.patch
queue-4.4/mmc-sdhci-fix-data-timeout-part-2.patch
queue-4.4/perf-x86-intel-add-definition-for-pt-pmi-bit.patch
queue-4.4/mmc-sdhci-fix-data-timeout-part-1.patch