Merge tag 'mmc-for-2026.04-rc1' of https://source.denx.de/u-boot/custodians/u-boot-mmc

CI: https://source.denx.de/u-boot/custodians/u-boot-mmc/-/pipelines/28960

- Revert "Use max-frequency from device tree with default handling"
- Select CRC16 MMC_SPI_CRC_ON
- Add 1ms delay with 1ms margin after mmc power on to follow spec

drivers/mmc/Kconfig

@@ -91,6 +91,7 @@ config MMC_SPI_CRC_ON
 	bool "Support CRC for SPI-based MMC controller"
 	depends on MMC_SPI
 	default y
+	select CRC16
 	help
 	  This enables CRC for SPI-based MMC controllers.
 

drivers/mmc/mmc-uclass.c

@@ -243,13 +243,8 @@ int mmc_of_parse(struct udevice *dev, struct mmc_config *cfg)
 		return -EINVAL;
 	}
 
-	/*
-	 * Maximum frequency is obtained from the optional "max-frequency" property.
-	 * If not specified in device tree, defaults to 0 and sdhci_setup_cfg()
-	 * will set the MMC configuration maximum frequency to the host controller's
-	 * maximum base clock frequency from capabilities register.
-	 */
-	cfg->f_max = dev_read_u32_default(dev, "max-frequency", 0);
+	/* f_max is obtained from the optional "max-frequency" property */
+	dev_read_u32(dev, "max-frequency", &cfg->f_max);
 
 	if (dev_read_bool(dev, "cap-sd-highspeed"))
 		cfg->host_caps |= MMC_CAP(SD_HS);

drivers/mmc/mmc.c

@@ -2933,11 +2933,18 @@ static int mmc_power_cycle(struct mmc *mmc)
 		return ret;
 
 	/*
-	 * SD spec recommends at least 1ms of delay. Let's wait for 2ms
-	 * to be on the safer side.
+	 * SD spec recommends at least 1ms of 'power on' delay.
+	 * Let's wait for 2ms to be on the safer side.
 	 */
 	udelay(2000);
-	return mmc_power_on(mmc);
+	ret = mmc_power_on(mmc);
+
+	/*
+	 * SD spec recommends at least 1ms of 'stable supply voltage' delay.
+	 * Let's wait for 2ms to be on the safer side.
+	 */
+	udelay(2000);
+	return ret;
 }
 
 int mmc_get_op_cond(struct mmc *mmc, bool quiet)