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imx6: apply upstream mmc fix for DDR50 cards on UHS-I capable boards

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https://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc.git/commit/?h=fixes&id=9f327845358d3dd0d8a5a7a5436b0aa5c432e757

Signed-off-by: Tim Harvey <tharvey@gateworks.com>
This commit is contained in:
Tim Harvey 2017-04-20 11:46:01 -07:00 committed by Felix Fietkau
parent 5bf98b1acc
commit bc1e7469aa
1 changed files with 42 additions and 0 deletions
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42
target/linux/imx6/patches-4.9/0003-mmc-sdhci-esdhc-imx-increase-the-pad-I-O-drive-stren.patch Normal file
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@ -0,0 +1,42 @@
From 9f327845358d3dd0d8a5a7a5436b0aa5c432e757 Mon Sep 17 00:00:00 2001
From: Haibo Chen <haibo.chen@nxp.com>
Date: Wed, 19 Apr 2017 10:53:51 +0800
Subject: [PATCH] mmc: sdhci-esdhc-imx: increase the pad I/O drive strength for
DDR50 card
Currently for DDR50 card, it need tuning in default. We meet tuning fail
issue for DDR50 card and some data CRC error when DDR50 sd card works.
This is because the default pad I/O drive strength can't make sure DDR50
card work stable. So increase the pad I/O drive strength for DDR50 card,
and use pins_100mhz.
This fixes DDR50 card support for IMX since DDR50 tuning was enabled from
commit 9faac7b95ea4 ("mmc: sdhci: enable tuning for DDR50")
Tested-and-reported-by: Tim Harvey <tharvey@gateworks.com>
Signed-off-by: Haibo Chen <haibo.chen@nxp.com>
Cc: stable@vger.kernel.org # v4.4+
Acked-by: Dong Aisheng <aisheng.dong@nxp.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Tim Harvey <tharvey@gateworks.com>
---
drivers/mmc/host/sdhci-esdhc-imx.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c
index 7123ef9..445fc47 100644
--- a/drivers/mmc/host/sdhci-esdhc-imx.c
+++ b/drivers/mmc/host/sdhci-esdhc-imx.c
@@ -830,6 +830,7 @@ static int esdhc_change_pinstate(struct sdhci_host *host,
switch (uhs) {
case MMC_TIMING_UHS_SDR50:
+ case MMC_TIMING_UHS_DDR50:
pinctrl = imx_data->pins_100mhz;
break;
case MMC_TIMING_UHS_SDR104:
--
2.7.4