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| author | Baolin Wang <baolin.wang@linaro.org> | 2019-06-21 14:12:31 +0800 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2019-07-10 13:17:30 +0200 |
| commit | eef9e0a60e78be6873b515e85466cac2f25581ed (patch) | |
| tree | 080536cb48802b70ab60b945e3d5a644d0ccbb42 /drivers/mmc | |
| parent | cb3a7d4a0aec4e56043d6433724e0606d6b6efba (diff) | |
| download | linux-eef9e0a60e78be6873b515e85466cac2f25581ed.tar.gz linux-eef9e0a60e78be6873b515e85466cac2f25581ed.tar.bz2 linux-eef9e0a60e78be6873b515e85466cac2f25581ed.zip | |
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: Baolin Wang <baolin.wang@linaro.org>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc')
| -rw-r--r-- | drivers/mmc/host/sdhci-sprd.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/mmc/host/sdhci-sprd.c b/drivers/mmc/host/sdhci-sprd.c index 024c3c5fa979..8b23c8838fb9 100644 --- a/drivers/mmc/host/sdhci-sprd.c +++ b/drivers/mmc/host/sdhci-sprd.c @@ -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; |