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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>
Haibo Chen 8 年之前
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共有 1 个文件被更改,包括 1 次插入0 次删除
  1. 1 0
      drivers/mmc/host/sdhci-esdhc-imx.c

+ 1 - 0
drivers/mmc/host/sdhci-esdhc-imx.c

@@ -830,6 +830,7 @@ static int esdhc_change_pinstate(struct sdhci_host *host,
 
 
 	switch (uhs) {
 	switch (uhs) {
 	case MMC_TIMING_UHS_SDR50:
 	case MMC_TIMING_UHS_SDR50:
+	case MMC_TIMING_UHS_DDR50:
 		pinctrl = imx_data->pins_100mhz;
 		pinctrl = imx_data->pins_100mhz;
 		break;
 		break;
 	case MMC_TIMING_UHS_SDR104:
 	case MMC_TIMING_UHS_SDR104: