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