Messages in this thread Patch in this message | | | From | Jason Lai <> | Subject | [RFC PATCH v3.2 14/29] mmc: sdhci-uhs2: skip signal_voltage_switch() | Date | Thu, 22 Jul 2021 12:01:09 +0800 |
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For UHS2, the signal voltage is supplied by vdd2 which is already 1.8v, so no voltage switch required.
Signed-off-by: Ben Chuang <ben.chuang@genesyslogic.com.tw> Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org> --- drivers/mmc/host/sdhci-uhs2.c | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+)
diff --git a/drivers/mmc/host/sdhci-uhs2.c b/drivers/mmc/host/sdhci-uhs2.c index 2bf78cc4e9ed..1eca89359351 100644 --- a/drivers/mmc/host/sdhci-uhs2.c +++ b/drivers/mmc/host/sdhci-uhs2.c @@ -178,6 +178,29 @@ void sdhci_uhs2_set_power(struct sdhci_host *host, unsigned char mode, } EXPORT_SYMBOL_GPL(sdhci_uhs2_set_power);
+/*****************************************************************************\ + * * + * MMC callbacks * + * * +\*****************************************************************************/ + +static int sdhci_uhs2_start_signal_voltage_switch(struct mmc_host *mmc, + struct mmc_ios *ios) +{ + struct sdhci_host *host = mmc_priv(mmc); + + /* + * For UHS2, the signal voltage is supplied by vdd2 which is + * already 1.8v so no voltage switch required. + */ + if (IS_ENABLED(CONFIG_MMC_SDHCI_UHS2) && + host->version >= SDHCI_SPEC_400 && + host->mmc->flags & MMC_UHS2_SUPPORT) + return 0; + + return sdhci_start_signal_voltage_switch(mmc, ios); +} + /*****************************************************************************\ * * * Driver init/exit * @@ -186,6 +209,9 @@ EXPORT_SYMBOL_GPL(sdhci_uhs2_set_power);
static int sdhci_uhs2_host_ops_init(struct sdhci_host *host) { + host->mmc_host_ops.start_signal_voltage_switch = + sdhci_uhs2_start_signal_voltage_switch; + return 0; }
-- 2.32.0
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