mmc: Downgrade SD/MMC from UHS/HS200/HS400 modes before boot
Older kernel versions or systems which do not connect eMMC reset line
properly may not be able to handle situations where either the eMMC
is left in HS200/HS400 mode or SD card in UHS modes by the bootloader
and may misbehave. Downgrade the eMMC to HS/HS52 mode and/or SD card
to non-UHS mode before booting the kernel to allow such older kernels
to work with modern U-Boot.
Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Tom Rini <trini@konsulko.com>
diff --git a/drivers/mmc/mmc-uclass.c b/drivers/mmc/mmc-uclass.c
index 76225b7..a9c8f33 100644
--- a/drivers/mmc/mmc-uclass.c
+++ b/drivers/mmc/mmc-uclass.c
@@ -368,6 +368,19 @@
return 0;
}
+#if CONFIG_IS_ENABLED(MMC_UHS_SUPPORT) || \
+ CONFIG_IS_ENABLED(MMC_HS200_SUPPORT) || \
+ CONFIG_IS_ENABLED(MMC_HS400_SUPPORT)
+static int mmc_blk_remove(struct udevice *dev)
+{
+ struct udevice *mmc_dev = dev_get_parent(dev);
+ struct mmc_uclass_priv *upriv = dev_get_uclass_priv(mmc_dev);
+ struct mmc *mmc = upriv->mmc;
+
+ return mmc_deinit(mmc);
+}
+#endif
+
static const struct blk_ops mmc_blk_ops = {
.read = mmc_bread,
#if CONFIG_IS_ENABLED(MMC_WRITE)
@@ -382,6 +395,12 @@
.id = UCLASS_BLK,
.ops = &mmc_blk_ops,
.probe = mmc_blk_probe,
+#if CONFIG_IS_ENABLED(MMC_UHS_SUPPORT) || \
+ CONFIG_IS_ENABLED(MMC_HS200_SUPPORT) || \
+ CONFIG_IS_ENABLED(MMC_HS400_SUPPORT)
+ .remove = mmc_blk_remove,
+ .flags = DM_FLAG_OS_PREPARE,
+#endif
};
#endif /* CONFIG_BLK */