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mmc: sdhci-sprd: Add start_signal_voltage_switch ops

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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: Baolin Wang <baolin.wang@linaro.org>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Baolin Wang 2019-06-21 14:12:31 +08:00 committed by Ulf Hansson
parent cb3a7d4a0a
commit eef9e0a60e
1 changed files with 24 additions and 0 deletions
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24
drivers/mmc/host/sdhci-sprd.c
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@ -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;