linux-kernel - [PATCH 4.14 101/167] mmc: bcm2835: Dont overwrite max frequency unconditionally

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Date:   Wed, 21 Feb 2018 13:48:32 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Phil Elwell <phil@...pberrypi.org>,
        Stefan Wahren <stefan.wahren@...e.com>,
        Ulf Hansson <ulf.hansson@...aro.org>
Subject: [PATCH 4.14 101/167] mmc: bcm2835: Dont overwrite max frequency unconditionally

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Phil Elwell <phil@...pberrypi.org>

commit 118032be389009b07ecb5a03ffe219a89d421def upstream.

The optional DT parameter max-frequency could init the max bus frequency.
So take care of this, before setting the max bus frequency.

Fixes: 660fc733bd74 ("mmc: bcm2835: Add new driver for the sdhost controller.")
Signed-off-by: Phil Elwell <phil@...pberrypi.org>
Signed-off-by: Stefan Wahren <stefan.wahren@...e.com>
Cc: <stable@...r.kernel.org> # 4.12+
Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/mmc/host/bcm2835.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/mmc/host/bcm2835.c
+++ b/drivers/mmc/host/bcm2835.c
@@ -1265,7 +1265,8 @@ static int bcm2835_add_host(struct bcm28
 	char pio_limit_string[20];
 	int ret;
 
-	mmc->f_max = host->max_clk;
+	if (!mmc->f_max || mmc->f_max > host->max_clk)
+		mmc->f_max = host->max_clk;
 	mmc->f_min = host->max_clk / SDCDIV_MAX_CDIV;
 
 	mmc->max_busy_timeout = ~0 / (mmc->f_max / 1000);