This is a note to let you know that I've just added the patch titled
mmc: sdhci: restore behavior when setting VDD via external regulator
to the 4.4-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-sdhci-restore-behavior-when-setting-vdd-via-external-regulator.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 918f4cbd4340ddd1eb389cd8efa3b07ac74ec4c0 Mon Sep 17 00:00:00 2001
From: Jisheng Zhang <jszhang@xxxxxxxxxxx>
Date: Fri, 11 Dec 2015 21:36:29 +0800
Subject: mmc: sdhci: restore behavior when setting VDD via external regulator
From: Jisheng Zhang <jszhang@xxxxxxxxxxx>
commit 918f4cbd4340ddd1eb389cd8efa3b07ac74ec4c0 upstream.
After commit 52221610dd84 ("mmc: sdhci: Improve external VDD regulator
support"), for the VDD is supplied via external regulators, we ignore
the code to convert a VDD voltage request into one of the standard
SDHCI voltage levels, then program it in the SDHCI_POWER_CONTROL. This
brings two issues:
1. SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON quirk isn't handled properly any
more.
2. What's more, once SDHCI_POWER_ON bit is set, some controllers such
as the sdhci-pxav3 used in marvell berlin SoCs require the voltage
levels programming in the SDHCI_POWER_CONTROL register, even the VDD
is supplied by external regulator. So the host in marvell berlin SoCs
still works fine after the commit. However, commit 3cbc6123a93d ("mmc:
sdhci: Set SDHCI_POWER_ON with external vmmc") sets the SDHCI_POWER_ON
bit, this would make the host in marvell berlin SoCs won't work any
more with external vmmc.
This patch restores the behavior when setting VDD through external
regulator by moving the call of mmc_regulator_set_ocr() to the end
of sdhci_set_power() function.
After this patch, the sdcard on Marvell Berlin SoC boards work again.
Signed-off-by: Jisheng Zhang <jszhang@xxxxxxxxxxx>
Fixes: 52221610dd84 ("mmc: sdhci: Improve external VDD ...")
Reviewed-by: Ludovic Desroches <ludovic.desroches@xxxxxxxxx>
Tested-by: Ludovic Desroches <ludovic.desroches@xxxxxxxxx>
Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/mmc/host/sdhci.c | 19 ++++++-------------
1 file changed, 6 insertions(+), 13 deletions(-)
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -1290,19 +1290,6 @@ static void sdhci_set_power(struct sdhci
struct mmc_host *mmc = host->mmc;
u8 pwr = 0;
- if (!IS_ERR(mmc->supply.vmmc)) {
- spin_unlock_irq(&host->lock);
- mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd);
- spin_lock_irq(&host->lock);
-
- if (mode != MMC_POWER_OFF)
- sdhci_writeb(host, SDHCI_POWER_ON, SDHCI_POWER_CONTROL);
- else
- sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
-
- return;
- }
-
if (mode != MMC_POWER_OFF) {
switch (1 << vdd) {
case MMC_VDD_165_195:
@@ -1363,6 +1350,12 @@ static void sdhci_set_power(struct sdhci
if (host->quirks & SDHCI_QUIRK_DELAY_AFTER_POWER)
mdelay(10);
}
+
+ if (!IS_ERR(mmc->supply.vmmc)) {
+ spin_unlock_irq(&host->lock);
+ mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd);
+ spin_lock_irq(&host->lock);
+ }
}
/*****************************************************************************\
Patches currently in stable-queue which might be from jszhang@xxxxxxxxxxx are
queue-4.4/mmc-sdhci-fix-regression-setting-power-on-trats2-board.patch
queue-4.4/mmc-sdhci-restore-behavior-when-setting-vdd-via-external-regulator.patch
