From: Philip Rakity <prakity@marvell.com>
Date: Fri, 8 Jun 2012 19:26:13 +0000 (-0700)
Subject: mmc: only support voltage (vdd) that regulator agrees with
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=68737043bb155b42d54943d25153b901fd16e535;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git

mmc: only support voltage (vdd) that regulator agrees with

If we are using a regulator the SD Host Controller and the
regulator should agree about the voltages supported.  Use
the common subset that is supported.

Signed-off-by: Philip Rakity <prakity@marvell.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
---

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 8f61f8d6e0ca..f76736b50bc7 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -2844,6 +2844,23 @@ int sdhci_add_host(struct sdhci_host *host)
 		host->vmmc = NULL;
 	}
 
+#ifdef CONFIG_REGULATOR
+	if (host->vmmc) {
+		ret = regulator_is_supported_voltage(host->vmmc, 3300000,
+			3300000);
+		if ((ret <= 0) || (!(caps[0] & SDHCI_CAN_VDD_330)))
+			caps[0] &= ~SDHCI_CAN_VDD_330;
+		ret = regulator_is_supported_voltage(host->vmmc, 3000000,
+			3000000);
+		if ((ret <= 0) || (!(caps[0] & SDHCI_CAN_VDD_300)))
+			caps[0] &= ~SDHCI_CAN_VDD_300;
+		ret = regulator_is_supported_voltage(host->vmmc, 1800000,
+			1800000);
+		if ((ret <= 0) || (!(caps[0] & SDHCI_CAN_VDD_180)))
+			caps[0] &= ~SDHCI_CAN_VDD_180;
+	}
+#endif /* CONFIG_REGULATOR */
+
 	/*
 	 * According to SD Host Controller spec v3.00, if the Host System
 	 * can afford more than 150mA, Host Driver should set XPC to 1. Also