linux-kernel - [PATCH 4.2 107/134] mmc: sdhci-of-esdhc: add workaround for pre divider initial value

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Date:	Sat, 26 Sep 2015 13:55:59 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Yangbo Lu <yangbo.lu@...escale.com>,
	Joakim Tjernlund <Joakim.Tjernlund@...nsmode.se>,
	Ulf Hansson <ulf.hansson@...aro.org>
Subject: [PATCH 4.2 107/134] mmc: sdhci-of-esdhc: add workaround for pre divider initial value

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

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

From: Yangbo Lu <yangbo.lu@...escale.com>

commit 77bd2f6f6c65b4ad259394d416855ed561f21e8f upstream.

For eSDHC(version < 2.3), the pre divider only could divide base clock
by 2 at least. Add workaround for this to avoid unexpected issue.

Signed-off-by: Yangbo Lu <yangbo.lu@...escale.com>
Acked-by: Joakim Tjernlund <Joakim.Tjernlund@...nsmode.se>
Fixes: bd455029d01c ("mmc: sdhci-of-esdhc: Pre divider starts at 1")
Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

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

--- a/drivers/mmc/host/sdhci-of-esdhc.c
+++ b/drivers/mmc/host/sdhci-of-esdhc.c
@@ -208,6 +208,12 @@ static void esdhc_of_set_clock(struct sd
 	if (clock == 0)
 		return;
 
+	/* Workaround to start pre_div at 2 for VNN < VENDOR_V_23 */
+	temp = esdhc_readw(host, SDHCI_HOST_VERSION);
+	temp = (temp & SDHCI_VENDOR_VER_MASK) >> SDHCI_VENDOR_VER_SHIFT;
+	if (temp < VENDOR_V_23)
+		pre_div = 2;
+
 	/* Workaround to reduce the clock frequency for p1010 esdhc */
 	if (of_find_compatible_node(NULL, NULL, "fsl,p1010-esdhc")) {
 		if (clock > 20000000)


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