From adc828556dfc3f87a5c1338fc5412cbec3c0b529 Mon Sep 17 00:00:00 2001 From: "Chuanxiao.Dong" Date: Tue, 19 Aug 2014 11:02:41 +0800 Subject: mmc: sdhci: check 1.2v IO capability for SDHC host Right now enable 1.2v IO voltage for SDHC is by using vqmmc. Thus for the host which doesn't have vqmmc, or its vqmmc does not support 1.2v, directly use MMC_CAP2_HS200 may cause HS200 failure. So needs to check if vqmmc is able to support 1.2v. If it does not support, disable 1.2v IO for HS200. Signed-off-by: Chuanxiao Dong Signed-off-by: Ulf Hansson --- drivers/mmc/host/sdhci.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) (limited to 'drivers/mmc') diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index 335cdf3b5224..7481bd863502 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -3037,8 +3037,13 @@ int sdhci_add_host(struct sdhci_host *host) /* SD3.0: SDR104 is supported so (for eMMC) the caps2 * field can be promoted to support HS200. */ - if (!(host->quirks2 & SDHCI_QUIRK2_BROKEN_HS200)) + if (!(host->quirks2 & SDHCI_QUIRK2_BROKEN_HS200)) { mmc->caps2 |= MMC_CAP2_HS200; + if (IS_ERR(mmc->supply.vqmmc) || + !regulator_is_supported_voltage + (mmc->supply.vqmmc, 1100000, 1300000)) + mmc->caps2 &= ~MMC_CAP2_HS200_1_2V_SDR; + } } else if (caps[1] & SDHCI_SUPPORT_SDR50) mmc->caps |= MMC_CAP_UHS_SDR50; -- cgit v1.2.3