linux-kernel - [PATCH AUTOSEL 5.7 245/274] mmc: mmci: Switch to mmc_regulator_set

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Message-Id: <20200608230607.3361041-245-sashal@kernel.org>
Date:   Mon,  8 Jun 2020 19:05:38 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Marek Vasut <marex@...x.de>, Ulf Hansson <ulf.hansson@...aro.org>,
        Sasha Levin <sashal@...nel.org>, linux-mmc@...r.kernel.org
Subject: [PATCH AUTOSEL 5.7 245/274] mmc: mmci: Switch to mmc_regulator_set_vqmmc()

From: Marek Vasut <marex@...x.de>

[ Upstream commit 3e09a81e166c0a5544832459be17561a6b231ac7 ]

Instead of reimplementing the logic in mmc_regulator_set_vqmmc(), use the
mmc code function directly.

This also allows us to fix a related issue on STM32MP1, when a voltage
switch of 1.8V is done for the eMMC, but the current level is already set
to 1.8V. More precisely, in this scenario the call to the
->post_sig_volt_switch() hangs, indefinitely waiting for the voltage switch
to complete. Fix this problem by checking if mmc_regulator_set_vqmmc()
returned 1 and then skip invoking the callback.

Signed-off-by: Marek Vasut <marex@...x.de>
Link: https://lore.kernel.org/r/20200416163649.336967-3-marex@denx.de
[Ulf: Updated the commit message]
Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/mmc/host/mmci.c | 30 ++++++++----------------------
 1 file changed, 8 insertions(+), 22 deletions(-)

diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index 647567def612..a69d6a0c2e15 100644
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c
@@ -1861,31 +1861,17 @@ static int mmci_get_cd(struct mmc_host *mmc)
 static int mmci_sig_volt_switch(struct mmc_host *mmc, struct mmc_ios *ios)
 {
 	struct mmci_host *host = mmc_priv(mmc);
-	int ret = 0;
-
-	if (!IS_ERR(mmc->supply.vqmmc)) {
+	int ret;
 
-		switch (ios->signal_voltage) {
-		case MMC_SIGNAL_VOLTAGE_330:
-			ret = regulator_set_voltage(mmc->supply.vqmmc,
-						2700000, 3600000);
-			break;
-		case MMC_SIGNAL_VOLTAGE_180:
-			ret = regulator_set_voltage(mmc->supply.vqmmc,
-						1700000, 1950000);
-			break;
-		case MMC_SIGNAL_VOLTAGE_120:
-			ret = regulator_set_voltage(mmc->supply.vqmmc,
-						1100000, 1300000);
-			break;
-		}
+	ret = mmc_regulator_set_vqmmc(mmc, ios);
 
-		if (!ret && host->ops && host->ops->post_sig_volt_switch)
-			ret = host->ops->post_sig_volt_switch(host, ios);
+	if (!ret && host->ops && host->ops->post_sig_volt_switch)
+		ret = host->ops->post_sig_volt_switch(host, ios);
+	else if (ret)
+		ret = 0;
 
-		if (ret)
-			dev_warn(mmc_dev(mmc), "Voltage switch failed\n");
-	}
+	if (ret < 0)
+		dev_warn(mmc_dev(mmc), "Voltage switch failed\n");
 
 	return ret;
 }
-- 
2.25.1