From 8974ff1a60365dedf1192632f5e0c21680d49dbc Mon Sep 17 00:00:00 2001 From: Haibo Chen Date: Mon, 22 Mar 2021 18:55:38 +0800 Subject: [PATCH] mmc: fsl_esdhc_imx: add extra delay for IO voltage switch if necessary Some board like imx8mm-evkb, IO voltage switch from 3.3v to 1.8v need around 18ms, common code only delay 10ms, so need to delay extra 8ms. Otherwise voltage switch will timeout when wait for data0 line. This IO voltage switch time depends on board design, depend on the PMIC and capacitance. imx8mm-evkb board use PCA9450(PMIC) and 10uF capacitance. Signed-off-by: Haibo Chen --- arch/arm/dts/imx8mm-evk-u-boot.dtsi | 1 + drivers/mmc/fsl_esdhc_imx.c | 12 ++++++++++++ 2 files changed, 13 insertions(+) diff --git a/arch/arm/dts/imx8mm-evk-u-boot.dtsi b/arch/arm/dts/imx8mm-evk-u-boot.dtsi index 495bef3d38..3701557dec 100644 --- a/arch/arm/dts/imx8mm-evk-u-boot.dtsi +++ b/arch/arm/dts/imx8mm-evk-u-boot.dtsi @@ -113,6 +113,7 @@ u-boot,dm-spl; sd-uhs-sdr104; sd-uhs-ddr50; + fsl,signal-voltage-switch-extra-delay-ms = <8>; }; &usdhc3 { diff --git a/drivers/mmc/fsl_esdhc_imx.c b/drivers/mmc/fsl_esdhc_imx.c index 93fd934379..a4675838e5 100644 --- a/drivers/mmc/fsl_esdhc_imx.c +++ b/drivers/mmc/fsl_esdhc_imx.c @@ -146,6 +146,7 @@ struct esdhc_soc_data { * @start_tuning_tap: the start point for tuning in tuning_ctrl register * @strobe_dll_delay_target: settings in strobe_dllctrl * @signal_voltage: indicating the current voltage + * @signal_voltage_switch_extra_delay_ms: extra delay for IO voltage switch * @cd_gpio: gpio for card detection * @wp_gpio: gpio for write protection */ @@ -170,6 +171,7 @@ struct fsl_esdhc_priv { u32 tuning_start_tap; u32 strobe_dll_delay_target; u32 signal_voltage; + u32 signal_voltage_switch_extra_delay_ms; #if CONFIG_IS_ENABLED(DM_REGULATOR) struct udevice *vqmmc_dev; struct udevice *vmmc_dev; @@ -836,6 +838,14 @@ static int esdhc_set_voltage(struct mmc *mmc) } #endif esdhc_setbits32(®s->vendorspec, ESDHC_VENDORSPEC_VSELECT); + /* + * some board like imx8mm-evk need about 18ms to switch + * the IO voltage from 3.3v to 1.8v, common code only + * delay 10ms, so need to delay extra time to make sure + * the IO voltage change to 1.8v. + */ + if (priv->signal_voltage_switch_extra_delay_ms) + mdelay(priv->signal_voltage_switch_extra_delay_ms); if (esdhc_read32(®s->vendorspec) & ESDHC_VENDORSPEC_VSELECT) return 0; @@ -1450,6 +1460,8 @@ static int fsl_esdhc_of_to_plat(struct udevice *dev) val = fdtdec_get_int(fdt, node, "fsl,strobe-dll-delay-target", ESDHC_STROBE_DLL_CTRL_SLV_DLY_TARGET_DEFAULT); priv->strobe_dll_delay_target = val; + val = fdtdec_get_int(fdt, node, "fsl,signal-voltage-switch-extra-delay-ms", 0); + priv->signal_voltage_switch_extra_delay_ms = val; if (dev_read_bool(dev, "broken-cd")) priv->broken_cd = 1; -- 2.39.5