Messages in this thread Patch in this message | | | From | Victor Shih <> | Subject | [PATCH V5 13/26] mmc: sdhci-uhs2: skip signal_voltage_switch() | Date | Mon, 17 Oct 2022 17:11:40 +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> Signed-off-by: Victor Shih <victor.shih@genesyslogic.com.tw> --- drivers/mmc/host/sdhci-uhs2.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+)
diff --git a/drivers/mmc/host/sdhci-uhs2.c b/drivers/mmc/host/sdhci-uhs2.c index 896a1c8e55cf..4dc3e904d7d2 100644 --- a/drivers/mmc/host/sdhci-uhs2.c +++ b/drivers/mmc/host/sdhci-uhs2.c @@ -196,6 +196,27 @@ 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 (sdhci_uhs2_mode(host)) + return 0; + + return sdhci_start_signal_voltage_switch(mmc, ios); +} + /*****************************************************************************\ * * * Driver init/exit * @@ -204,6 +225,9 @@ 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; } -- 2.25.1
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