target/linux/imx6/patches-4.9/0003-mmc-sdhci-esdhc-imx-increase-the-pad-I-O-drive-stren.patch

   1 From 9f327845358d3dd0d8a5a7a5436b0aa5c432e757 Mon Sep 17 00:00:00 2001
   2 From: Haibo Chen <haibo.chen@nxp.com>
   3 Date: Wed, 19 Apr 2017 10:53:51 +0800
   4 Subject: [PATCH] mmc: sdhci-esdhc-imx: increase the pad I/O drive strength for
   5  DDR50 card
   6
   7 Currently for DDR50 card, it need tuning in default. We meet tuning fail
   8 issue for DDR50 card and some data CRC error when DDR50 sd card works.
   9
  10 This is because the default pad I/O drive strength can't make sure DDR50
  11 card work stable. So increase the pad I/O drive strength for DDR50 card,
  12 and use pins_100mhz.
  13
  14 This fixes DDR50 card support for IMX since DDR50 tuning was enabled from
  15 commit 9faac7b95ea4 ("mmc: sdhci: enable tuning for DDR50")
  16
  17 Tested-and-reported-by: Tim Harvey <tharvey@gateworks.com>
  18 Signed-off-by: Haibo Chen <haibo.chen@nxp.com>
  19 Cc: stable@vger.kernel.org # v4.4+
  20 Acked-by: Dong Aisheng <aisheng.dong@nxp.com>
  21 Acked-by: Adrian Hunter <adrian.hunter@intel.com>
  22 Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
  23 Signed-off-by: Tim Harvey <tharvey@gateworks.com>
  24 ---
  25  drivers/mmc/host/sdhci-esdhc-imx.c | 1 +
  26  1 file changed, 1 insertion(+)
  27
  28 diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c
  29 index 7123ef9..445fc47 100644
  30 --- a/drivers/mmc/host/sdhci-esdhc-imx.c
  31 +++ b/drivers/mmc/host/sdhci-esdhc-imx.c
  32 @@ -830,6 +830,7 @@ static int esdhc_change_pinstate(struct sdhci_host *host,
  33
  34         switch (uhs) {
  35         case MMC_TIMING_UHS_SDR50:
  36 +       case MMC_TIMING_UHS_DDR50:
  37                 pinctrl = imx_data->pins_100mhz;
  38                 break;
  39         case MMC_TIMING_UHS_SDR104:
  40 --
  41 2.7.4
  42