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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>
This commit is contained in:
Chuanxiao.Dong 2014-08-19 11:02:41 +08:00 committed by Ulf Hansson
parent 312449efd1
commit adc828556d
1 changed files with 6 additions and 1 deletions
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7
drivers/mmc/host/sdhci.c
View File

@ -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;