| 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: mmc: sdhci-esdhc-imx: increase the pad I/O drive strength for DDR50 card |
| |
| From: Haibo Chen <haibo.chen@nxp.com> |
| |
| commit 9f327845358d3dd0d8a5a7a5436b0aa5c432e757 upstream. |
| |
| 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> |
| 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: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| |
| --- |
| drivers/mmc/host/sdhci-esdhc-imx.c | 1 + |
| 1 file changed, 1 insertion(+) |
| |
| --- a/drivers/mmc/host/sdhci-esdhc-imx.c |
| +++ b/drivers/mmc/host/sdhci-esdhc-imx.c |
| @@ -824,6 +824,7 @@ static int esdhc_change_pinstate(struct |
| |
| switch (uhs) { |
| case MMC_TIMING_UHS_SDR50: |
| + case MMC_TIMING_UHS_DDR50: |
| pinctrl = imx_data->pins_100mhz; |
| break; |
| case MMC_TIMING_UHS_SDR104: |