linux-kernel - [PATCH 4.12 21/27] mmc: sdhci-xenon: add set

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Message-Id: <20170905070924.067795530@linuxfoundation.org>
Date:   Tue,  5 Sep 2017 09:11:37 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Zhoujie Wu <zjwu@...vell.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Gregory CLEMENT <gregory.clement@...e-electrons.com>,
        Ulf Hansson <ulf.hansson@...aro.org>
Subject: [PATCH 4.12 21/27] mmc: sdhci-xenon: add set_power callback

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

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

From: Zhoujie Wu <zjwu@...vell.com>

commit 99c14fc360dbbb583a03ab985551b12b5c5ca4f1 upstream.

Xenon sdh controller requests proper SD bus voltage select
bits programmed even with vmmc power supply. Any reserved
value(100b-000b) programmed in this field will lead to controller
ignore SD bus power bit and keep its value at zero.
Add set_power callback to handle this.

Signed-off-by: Zhoujie Wu <zjwu@...vell.com>
Acked-by: Adrian Hunter <adrian.hunter@...el.com>
Tested-by: Gregory CLEMENT <gregory.clement@...e-electrons.com>
Fixes: 3a3748dba881 ("mmc: sdhci-xenon: Add Marvell Xenon SDHC core functionality")
Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/mmc/host/sdhci-xenon.c |   19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

--- a/drivers/mmc/host/sdhci-xenon.c
+++ b/drivers/mmc/host/sdhci-xenon.c
@@ -210,8 +210,27 @@ static void xenon_set_uhs_signaling(stru
 	sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
 }
 
+static void xenon_set_power(struct sdhci_host *host, unsigned char mode,
+		unsigned short vdd)
+{
+	struct mmc_host *mmc = host->mmc;
+	u8 pwr = host->pwr;
+
+	sdhci_set_power_noreg(host, mode, vdd);
+
+	if (host->pwr == pwr)
+		return;
+
+	if (host->pwr == 0)
+		vdd = 0;
+
+	if (!IS_ERR(mmc->supply.vmmc))
+		mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd);
+}
+
 static const struct sdhci_ops sdhci_xenon_ops = {
 	.set_clock		= sdhci_set_clock,
+	.set_power		= xenon_set_power,
 	.set_bus_width		= sdhci_set_bus_width,
 	.reset			= xenon_reset,
 	.set_uhs_signaling	= xenon_set_uhs_signaling,