mmc: sdhci: check 1.2v IO capability for SDHC host (adc82855) · Commits · 戴 / test

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>

drivers/mmc/host/sdhci.c

+6 −1

Original line number	Diff line number	Diff line
		@@ -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;

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