This is a note to let you know that I've just added the patch titled
mmc: sdhci-of-esdhc: limit SD clock for ls1012a/ls1046a
to the 4.9-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-of-esdhc-limit-sd-clock-for-ls1012a-ls1046a.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Thu Mar 22 14:40:23 CET 2018
From: yangbo lu <yangbo.lu@xxxxxxx>
Date: Thu, 20 Apr 2017 14:58:29 +0800
Subject: mmc: sdhci-of-esdhc: limit SD clock for ls1012a/ls1046a
From: yangbo lu <yangbo.lu@xxxxxxx>
[ Upstream commit a627f025eb0534052ff451427c16750b3530634c ]
The ls1046a datasheet specified that the max SD clock frequency
for eSDHC SDR104/HS200 was 167MHz, and the ls1012a datasheet
specified it's 125MHz for ls1012a. So this patch is to add the
limitation.
Signed-off-by: Yangbo Lu <yangbo.lu@xxxxxxx>
Acked-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/mmc/host/sdhci-of-esdhc.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
--- a/drivers/mmc/host/sdhci-of-esdhc.c
+++ b/drivers/mmc/host/sdhci-of-esdhc.c
@@ -432,6 +432,20 @@ static void esdhc_of_set_clock(struct sd
if (esdhc->vendor_ver < VENDOR_V_23)
pre_div = 2;
+ /*
+ * Limit SD clock to 167MHz for ls1046a according to its datasheet
+ */
+ if (clock > 167000000 &&
+ of_find_compatible_node(NULL, NULL, "fsl,ls1046a-esdhc"))
+ clock = 167000000;
+
+ /*
+ * Limit SD clock to 125MHz for ls1012a according to its datasheet
+ */
+ if (clock > 125000000 &&
+ of_find_compatible_node(NULL, NULL, "fsl,ls1012a-esdhc"))
+ clock = 125000000;
+
/* Workaround to reduce the clock frequency for p1010 esdhc */
if (of_find_compatible_node(NULL, NULL, "fsl,p1010-esdhc")) {
if (clock > 20000000)
Patches currently in stable-queue which might be from yangbo.lu@xxxxxxx are
queue-4.9/mmc-sdhci-of-esdhc-limit-sd-clock-for-ls1012a-ls1046a.patch