Certain SDHC controllers may require that voltage switching happen after sepcial conditions. For SDHCI-MSM controllers, power irq is a signal from controller to SW that it is ready for voltage switch. So added support to register voltage regulators from the msm driver and use them. Voltage switching from core layer is causing CRC/cmd timeout errors in some chipsets. Changes since RFC: - Added DT option to pass regulator load values the sdhci-msm driver should vote during BUS_ON and BUS_OFF power irq. - Removed quirk and used local flags in sdhci_add_host to to avoid scenario of both sdhci & sdhci-msm layer controlling the regulators. - Introduced two sdhci msm layer APIs to replace the respective sdhci layer APIs. This is again to stop sdhci layer from controlling regulators if sdhci_msm layer is present. Changes since V1: - Introduced vqmmc_enabled flag in sdhci_host to track if vqmmc is enabled or not. - Updated DT option name with vendor prefix and unit suffix. - Introduced sdhci_msm_set_vmmc/vqmmc APIs for configuring vmmc and vqmmc. And moved all relevant code to these functions. - Removed pltfm_init_done flag from sdhci_msm_host which is not needed. As long as the device is in power-off state, SDHCI-MSM controller doesn't trigger power irq. So this flag is not needed. Changes since V2: - Updated conditional check with vqmmc instead of vmmc for mmc_regulator_get_supply() in sdhci_setup_host(). - Turning vmmc off if enabling vqmmc fails in sdhci_msm_init_pwr_irq_wait. - Without supplying load values of vmmc, observing turning errors. So removed optional flag for this DT option. Tested on: sdm845 Vijay Viswanath (3): mmc: sdhci: Allow platform controlled voltage switching dt-bindings: mmc: sdhci-msm: Add entries for passing load values mmc: sdhci-msm: Use internal voltage control .../devicetree/bindings/mmc/sdhci-msm.txt | 8 + drivers/mmc/host/sdhci-msm.c | 212 ++++++++++++++++++++- drivers/mmc/host/sdhci.c | 32 ++-- drivers/mmc/host/sdhci.h | 1 + 4 files changed, 232 insertions(+), 21 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.
