This is a note to let you know that I've just added the patch titled
mmc: core: add helpers mmc_regulator_enable/disable_vqmmc
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mmc-core-add-helpers-mmc_regulator_enable-disable_vq.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 218a9122675a93d0d8e02c1984e309d377905c63
Author: Heiner Kallweit <hkallweit1@xxxxxxxxx>
Date: Sat Mar 11 23:39:55 2023 +0100
mmc: core: add helpers mmc_regulator_enable/disable_vqmmc
[ Upstream commit 8d91f3f8ae57e6292142ca89f322e90fa0d6ac02 ]
There's a number of drivers (e.g. dw_mmc, meson-gx, mmci, sunxi) using
the same mechanism and a private flag vqmmc_enabled to deal with
enabling/disabling the vqmmc regulator.
Move this to the core and create new helpers mmc_regulator_enable_vqmmc
and mmc_regulator_disable_vqmmc.
Signed-off-by: Heiner Kallweit <hkallweit1@xxxxxxxxx>
Acked-by: Martin Blumenstingl <martin.blumenstingl@xxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/71586432-360f-9b92-17f6-b05a8a971bc2@xxxxxxxxx
Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
Stable-dep-of: 477865af60b2 ("mmc: sdhci-sprd: Fix vqmmc not shutting down after the card was pulled")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/mmc/core/regulator.c b/drivers/mmc/core/regulator.c
index 609201a467ef9..4dcbc2281d2b5 100644
--- a/drivers/mmc/core/regulator.c
+++ b/drivers/mmc/core/regulator.c
@@ -271,3 +271,44 @@ int mmc_regulator_get_supply(struct mmc_host *mmc)
return 0;
}
EXPORT_SYMBOL_GPL(mmc_regulator_get_supply);
+
+/**
+ * mmc_regulator_enable_vqmmc - enable VQMMC regulator for a host
+ * @mmc: the host to regulate
+ *
+ * Returns 0 or errno. Enables the regulator for vqmmc.
+ * Keeps track of the enable status for ensuring that calls to
+ * regulator_enable/disable are balanced.
+ */
+int mmc_regulator_enable_vqmmc(struct mmc_host *mmc)
+{
+ int ret = 0;
+
+ if (!IS_ERR(mmc->supply.vqmmc) && !mmc->vqmmc_enabled) {
+ ret = regulator_enable(mmc->supply.vqmmc);
+ if (ret < 0)
+ dev_err(mmc_dev(mmc), "enabling vqmmc regulator failed\n");
+ else
+ mmc->vqmmc_enabled = true;
+ }
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(mmc_regulator_enable_vqmmc);
+
+/**
+ * mmc_regulator_disable_vqmmc - disable VQMMC regulator for a host
+ * @mmc: the host to regulate
+ *
+ * Returns 0 or errno. Disables the regulator for vqmmc.
+ * Keeps track of the enable status for ensuring that calls to
+ * regulator_enable/disable are balanced.
+ */
+void mmc_regulator_disable_vqmmc(struct mmc_host *mmc)
+{
+ if (!IS_ERR(mmc->supply.vqmmc) && mmc->vqmmc_enabled) {
+ regulator_disable(mmc->supply.vqmmc);
+ mmc->vqmmc_enabled = false;
+ }
+}
+EXPORT_SYMBOL_GPL(mmc_regulator_disable_vqmmc);
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index 0c0c9a0fdf578..a4ec7269b6295 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -428,6 +428,7 @@ struct mmc_host {
unsigned int retune_paused:1; /* re-tuning is temporarily disabled */
unsigned int retune_crc_disable:1; /* don't trigger retune upon crc */
unsigned int can_dma_map_merge:1; /* merging can be used */
+ unsigned int vqmmc_enabled:1; /* vqmmc regulator is enabled */
int rescan_disable; /* disable card detection */
int rescan_entered; /* used with nonremovable devices */
@@ -574,6 +575,8 @@ static inline int mmc_regulator_set_vqmmc(struct mmc_host *mmc,
#endif
int mmc_regulator_get_supply(struct mmc_host *mmc);
+int mmc_regulator_enable_vqmmc(struct mmc_host *mmc);
+void mmc_regulator_disable_vqmmc(struct mmc_host *mmc);
static inline int mmc_card_is_removable(struct mmc_host *host)
{
