On Thu, Dec 26, 2024 at 11:04:11PM +0200, Dmitry Baryshkov wrote: > On Thu, Dec 26, 2024 at 11:18:45AM +0800, Yuanjie Yang wrote: > > Qualcomm regulator supports two power supply modes: HPM and LPM. > > Currently, the sdhci-msm.c driver does not set the load to adjust > > the current for eMMC and SD. If the regulator dont't set correct > > load in LPM state, it will lead to the inability to properly > > initialize eMMC and SD. > > > > Set the correct regulator current for eMMC and SD to ensure that the > > device can work normally even when the regulator is in LPM. > > > > Signed-off-by: Yuanjie Yang <quic_yuanjiey@xxxxxxxxxxx> > > --- > > Changes in v3: > > - Optimize the code logic and separate code for regulator vmmc and vqmmc > > - Rebase on tag: next-20241217 > > 10 days old branch > OK I will rebase on the latest tag in next patch. > > - Link to v2: https://lore.kernel.org/all/20241127095029.3918290-1-quic_yuanjiey@xxxxxxxxxxx/ > > > > Changes in v2: > > - Add enum msm_reg_type to optimize the code > > - Delete redundant emmc type judgment > > - Link to v1: https://lore.kernel.org/linux-arm-msm/20241122075048.2006894-1-quic_yuanjiey@xxxxxxxxxxx/ > > > > --- > > drivers/mmc/host/sdhci-msm.c | 64 ++++++++++++++++++++++++++++++++++-- > > 1 file changed, 62 insertions(+), 2 deletions(-) > > > > diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c > > index e00208535bd1..22811964ba61 100644 > > --- a/drivers/mmc/host/sdhci-msm.c > > +++ b/drivers/mmc/host/sdhci-msm.c > > @@ -134,9 +134,18 @@ > > /* Timeout value to avoid infinite waiting for pwr_irq */ > > #define MSM_PWR_IRQ_TIMEOUT_MS 5000 > > > > +/* Max load for eMMC Vdd supply */ > > +#define MMC_VMMC_MAX_LOAD_UA 570000 > > + > > /* Max load for eMMC Vdd-io supply */ > > #define MMC_VQMMC_MAX_LOAD_UA 325000 > > > > +/* Max load for SD Vdd supply */ > > +#define SD_VMMC_MAX_LOAD_UA 800000 > > + > > +/* Max load for SD Vdd-io supply */ > > +#define SD_VQMMC_MAX_LOAD_UA 22000 > > + > > #define msm_host_readl(msm_host, host, offset) \ > > msm_host->var_ops->msm_readl_relaxed(host, offset) > > > > @@ -1403,11 +1412,59 @@ static int sdhci_msm_set_pincfg(struct sdhci_msm_host *msm_host, bool level) > > return ret; > > } > > > > -static int sdhci_msm_set_vmmc(struct mmc_host *mmc) > > +static void msm_config_vmmc_regulator(struct mmc_host *mmc, bool hpm) > > +{ > > + int load; > > + > > + if (!mmc->card) { > > + regulator_set_mode(mmc->supply.vmmc, > > + hpm ? REGULATOR_MODE_NORMAL : REGULATOR_MODE_IDLE); > > Can there be other users of the regulator or is it an exclusive one? > Because if there can be other users, you could have pulled the power > from them. 1.Yes there may be others users of the regulator. I searched all the DTS files using the “qcom,sdhci-msm-v5” driver and found that the following four DTS files have instances where the SDHCI device and other devices share a regulator. qcm2290.dtsi qrb2210-rb1.dts SDHC2(sd) and usb share pm4125_l21 pm4125_l21: l21 { /* SDHCI2 VMMC */ regulator-min-microvolt = <2960000>; regulator-max-microvolt = <3300000>; regulator-allow-set-load; regulator-boot-on; }; sc7280.dtsi qcm6490-idp.dts SDHC_1(eMMC) and ufs share vreg_l7b_2p952 vreg_l7b_2p952: ldo7 { regulator-name = "vreg_l7b_2p952"; regulator-min-microvolt = <2400000>; regulator-max-microvolt = <3544000>; regulator-initial-mode = <RPMH_REGULATOR_MODE_HPM>; }; sc7280.dtsi sc7280-idp.dtsi SDHC_1(eMMC) and ufs share vreg_l7b_2p9 vreg_l7b_2p9: ldo7 { regulator-min-microvolt = <2960000>; regulator-max-microvolt = <2960000>; }; qcs615.dtsi qcs615-ride.dts SDHC_1(eMMC) and ufs vreg_l17a: ldo17 { regulator-name = "vreg_l17a"; regulator-min-microvolt = <2950000>; regulator-max-microvolt = <3312000>; regulator-initial-mode = <RPMH_REGULATOR_MODE_HPM>; }; We can see When SDHC device and other device share a regulator, the regulator doesn't have regulator-allowed-modes = <RPMH_REGULATOR_MODE_LPM> property. So even if the code here uses the regulator_set_mode(REGULATOR_MODE_IDLE), it will have no effect to other device. 2. code (!mmc->card) means SDHC device first intialize. When the SDHC device initialization does not recognize the device type, call mmc_power_up will reach condition (!mmc->card) && hpm == 1. Usually this situation is in SDHC initialization, and need to power up. This patch aim to set correct current to let SDHC can properly initialize even regulator-init-mode is LPM, but in first time initialization, We don't konw this device type. So we change regulator mode to HPM. When the SDHC device initialization does not recognize the device type, and call mmc_power_off will reach condition (!mmc->card) && hpm == 0. Usually this situation means SDHC device initialize fail. This scenario is rare, and most of the time the code cannot reach this point. > > + return; > > + } > > + > > + if (!mmc_card_mmc(mmc->card) && > > + !mmc_card_sd(mmc->card)) > > + return; > > + > > + if (mmc_card_mmc(mmc->card)) > > + load = MMC_VMMC_MAX_LOAD_UA; > > + else if (mmc_card_sd(mmc->card)) > > + load = SD_VMMC_MAX_LOAD_UA; > > if (mmc_card_mmc(mmc->card) || > mmc_card_sd(mmc->card)) Here, I want to filter out other types of devices, just select the corrsponding current only for eMMC and SD card. " if (!mmc_card_mmc(mmc->card) && !mmc_card_sd(mmc->card)) return; " filter out " if (mmc_card_mmc(mmc->card)) load = MMC_VMMC_MAX_LOAD_UA; else if (mmc_card_sd(mmc->card)) load = SD_VMMC_MAX_LOAD_UA; " select current > > + load = hpm ? load : 0; > > + > > + regulator_set_load(mmc->supply.vmmc, load); > > + > > + return; > > +} > > + > > +static void msm_config_vqmmc_regulator(struct mmc_host *mmc, bool hpm) > > +{ > > + int load; > > + > > + if (!mmc->card) { > > + regulator_set_mode(mmc->supply.vqmmc, > > + hpm ? REGULATOR_MODE_NORMAL : REGULATOR_MODE_IDLE); > > + return; > > + } > > + > > + if (!mmc_card_sd(mmc->card)) > > + return; > > + > > + load = hpm ? SD_VQMMC_MAX_LOAD_UA : 0; > > + > > + regulator_set_load(mmc->supply.vqmmc, load); > > + > > + return; > > +} > > + > > +static int sdhci_msm_set_vmmc(struct sdhci_msm_host *msm_host, > > + struct mmc_host *mmc, bool hpm) > > { > > if (IS_ERR(mmc->supply.vmmc)) > > return 0; > > > > + msm_config_vmmc_regulator(mmc, hpm); > > + > > return mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, mmc->ios.vdd); > > } > > > > @@ -1420,6 +1477,8 @@ static int msm_toggle_vqmmc(struct sdhci_msm_host *msm_host, > > if (msm_host->vqmmc_enabled == level) > > return 0; > > > > + msm_config_vqmmc_regulator(mmc, level); > > + > > if (level) { > > /* Set the IO voltage regulator to default voltage level */ > > if (msm_host->caps_0 & CORE_3_0V_SUPPORT) > > @@ -1642,7 +1701,8 @@ static void sdhci_msm_handle_pwr_irq(struct sdhci_host *host, int irq) > > } > > > > if (pwr_state) { > > - ret = sdhci_msm_set_vmmc(mmc); > > + ret = sdhci_msm_set_vmmc(msm_host, mmc, > > + pwr_state & REQ_BUS_ON); > > if (!ret) > > ret = sdhci_msm_set_vqmmc(msm_host, mmc, > > pwr_state & REQ_BUS_ON); > > -- > > 2.34.1 > > > > -- > With best wishes > Dmitry Thanks, Yuanjie
