linux-kernel - [PATCH] mmc: sdhci: restore behavior when setting VDD via external regulator

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Date:	Fri, 11 Dec 2015 21:19:59 +0800
From:	Jisheng Zhang <jszhang@...vell.com>
To:	<ulf.hansson@...aro.org>
CC:	<linux-mmc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	Jisheng Zhang <jszhang@...vell.com>
Subject: [PATCH] mmc: sdhci: restore behavior when setting VDD via external regulator

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, 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.

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 SoCs work again.

Signed-off-by: Jisheng Zhang <jszhang@...vell.com>
Fixes: 52221610dd84 ("mmc: sdhci: Improve external VDD ...")
---
 drivers/mmc/host/sdhci.c | 19 ++++++-------------
 1 file changed, 6 insertions(+), 13 deletions(-)

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index b48565e..616aa90 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -1274,19 +1274,6 @@ static void sdhci_set_power(struct sdhci_host *host, unsigned char mode,
 	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:
@@ -1345,6 +1332,12 @@ static void sdhci_set_power(struct sdhci_host *host, unsigned char mode,
 		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);
+	}
 }
 
 /*****************************************************************************\
-- 
2.6.3

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