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 <chuanxiao.dong@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 335cdf3b522437e479bad0e92c95d9561c7398c9..7481bd8635023f3fe7f3e07ef885e38a5e79acec 100644 (file)
--- 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;