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Commit eef9e0a6 authored by Baolin Wang's avatar Baolin Wang Committed by Ulf Hansson
Browse files

mmc: sdhci-sprd: Add start_signal_voltage_switch ops 



For Spreadtrum SD host controller, we can not use standard SD registers
to change and detect the I/O voltage signals, since our voltage regulator
for I/O is fixed in hardware, and no signals were connected to the SD
controller. Thus add Spreadtrum specific voltage switch ops to change
voltage instead of using standard SD host registers.

Signed-off-by: default avatarBaolin Wang <baolin.wang@linaro.org>
Acked-by: default avatarAdrian Hunter <adrian.hunter@intel.com>
Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent cb3a7d4a

drivers/mmc/host/sdhci-sprd.c

+24 −0
Original line number Diff line number Diff line
@@ -403,6 +403,22 @@ static void sdhci_sprd_request(struct mmc_host *mmc, struct mmc_request *mrq) 
	sdhci_request(mmc, mrq);

}



static int sdhci_sprd_voltage_switch(struct mmc_host *mmc, struct mmc_ios *ios)

{

	int ret;



	if (!IS_ERR(mmc->supply.vqmmc)) {

		ret = mmc_regulator_set_vqmmc(mmc, ios);

		if (ret) {

			pr_err("%s: Switching signalling voltage failed\n",

			       mmc_hostname(mmc));

			return ret;

		}

	}



	return 0;

}



static void sdhci_sprd_hs400_enhanced_strobe(struct mmc_host *mmc,

					     struct mmc_ios *ios)

{
@@ -470,6 +486,14 @@ static int sdhci_sprd_probe(struct platform_device *pdev) 
	host->mmc_host_ops.request = sdhci_sprd_request;

	host->mmc_host_ops.hs400_enhanced_strobe =

		sdhci_sprd_hs400_enhanced_strobe;

	/*

	 * We can not use the standard ops to change and detect the voltage

	 * signal for Spreadtrum SD host controller, since our voltage regulator

	 * for I/O is fixed in hardware, that means we do not need control

	 * the standard SD host controller to change the I/O voltage.

	 */

	host->mmc_host_ops.start_signal_voltage_switch =

		sdhci_sprd_voltage_switch;



	host->mmc->caps = MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED |

		MMC_CAP_ERASE | MMC_CAP_CMD23;