linux-kernel - [PATCH 3.18 116/183] mmc: sdhci: Set SDHCI_POWER

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Message-Id: <20150125180815.236559138@linuxfoundation.org>
Date:	Sun, 25 Jan 2015 10:07:18 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Tim Kryger <tim.kryger@...il.com>,
	Bjorn Andersson <bjorn.andersson@...ymobile.com>,
	Ulf Hansson <ulf.hansson@...aro.org>
Subject: [PATCH 3.18 116/183] mmc: sdhci: Set SDHCI_POWER_ON with external vmmc

3.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Tim Kryger <tim.kryger@...il.com>

commit 3cbc6123a93dc91b99b58f7ea37d267fe93e1cad upstream.

Host controllers lacking the required internal vmmc regulator may still
follow the spec with regard to the LSB of SDHCI_POWER_CONTROL.  Set the
SDHCI_POWER_ON bit when vmmc is enabled to encourage the controller to
to drive CMD, DAT, SDCLK.

This fixes a regression observed on some Qualcomm and Nvidia boards
caused by 5222161 mmc: sdhci: Improve external VDD regulator support.

Fixes: 52221610dd84 (mmc: sdhci: Improve external VDD regulator support)
Signed-off-by: Tim Kryger <tim.kryger@...il.com>
Tested-by: Bjorn Andersson <bjorn.andersson@...ymobile.com>
Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/mmc/host/sdhci.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -1239,6 +1239,12 @@ static void sdhci_set_power(struct sdhci
 		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;
 	}
 


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