On 20 April 2018 at 14:15, Vijay Viswanath <vviswana@xxxxxxxxxxxxxx> wrote: > From the HPG: > In some platform, SDCC controller can be connected to either an eMMC device or > an SD card. The PADs for SD card are dual-voltage that support 3v/1.8v. Those > PADs have a control signal (io_pad_pwr_switch/mode18 ) that indicates whether > the PAD works in 3v or 1.8v. > > For SD usage the default value of this signal is ‘0’, and SD driver changes it > to ‘1’ as a part of voltage switching sequence. > For eMMC usage, SW should configure this signal to ‘1’ and supply 1.8v to PADs > before starting any activity on the eMMC BUS. > > To set this signal, write the following in the > SDC1_SDCC_HC_VENDOR_SPECIFIC_FUNC register: > HC_IO_PAD_PWR_SWITCH: bit 16 > HC_IO_PAD_PWR_SWITCH_EN: bit 15 > Thanks, applied for next! Kind regards Uffe > Changes since v1: > Modified comments on io_pad related changes. > Split some read+modify+write commands to multiple lines > > Changes since v2: > IO_PAD_PWR_SWITCH_EN will be set only if we have info regarding what > voltage is supported by the regulators. > Replaced regulator_list_voltage() API with > regulator_is_supported_voltage(). > > Changes since v3: > Removed unnecessary prints and extra lines. > > Changes since v4: > Removed unnecessary mb() within sdhci_msm_handle_pwr_irq() since > wakeup calls have implicit write barriers. > > Krishna Konda (1): > mmc: sdhci-msm: support voltage pad switching > > Vijay Viswanath (1): > mmc: sdhci-msm: Add support to store supported vdd-io voltages > > drivers/mmc/host/sdhci-msm.c | 99 +++++++++++++++++++++++++++++++++++++++++++- > 1 file changed, 97 insertions(+), 2 deletions(-) > > -- > Qualcomm India Private Limited, on behalf of Qualcomm Innovation Center, Inc. > Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project. > -- To unsubscribe from this list: send the line "unsubscribe linux-arm-msm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
