MMC: Fix handling of low-voltage cards

Fix handling of low voltage MMC cards.

The latest MMC and SD specs both agree that support for
low-voltage operations is indicated by bit 7 in the OCR.
The MMC spec states that the low voltage range is
1.65-1.95V while the SD spec leaves the actual voltage
range undefined - meaning that there is still no such
thing as a low voltage SD card.

However, an old Sandisk spec implied that bits 7.0
represented voltages below 2.0V in 1V or 0.5V increments,
and the code was accordingly written with that expectation.

This confusion meant that host drivers attempting to support
the typical low voltage (1.8V) would set the wrong bits in
the host OCR mask (usually bits 5 and/or 6) resulting in the
the low voltage mode never being used.

This change corrects the low voltage range and adds sanity
checks on the reserved bits (0-6) and for SD cards that
claim to support low-voltage operations.

Signed-off-by: Philip Langdale <philipl@overt.org>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

4 files changed, 32 insertions, 11 deletions

diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index c528017d612..c2e120b11be 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -323,6 +323,17 @@ int mmc_attach_mmc(struct mmc_host *host, u32 ocr)
 
         mmc_attach_bus(host, &mmc_ops);
 
+        /*
+         * Sanity check the voltages that the card claims to
+         * support.
+         */
+        if (ocr & 0x7F) {
+                printk(KERN_WARNING "%s: card claims to support voltages "
+                       "below the defined range. These will be ignored.\n",
+                       mmc_hostname(host));
+                ocr &= ~0x7F;
+        }
+
         host->ocr = mmc_select_voltage(host, ocr);
 
         /*
diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c
index 6c6beb48f3a..fb18b301502 100644
--- a/drivers/mmc/core/sd.c
+++ b/drivers/mmc/core/sd.c
@@ -297,6 +297,24 @@ int mmc_attach_sd(struct mmc_host *host, u32 ocr)
 
         mmc_attach_bus(host, &mmc_sd_ops);
 
+        /*
+         * Sanity check the voltages that the card claims to
+         * support.
+         */
+        if (ocr & 0x7F) {
+                printk(KERN_WARNING "%s: card claims to support voltages "
+                       "below the defined range. These will be ignored.\n",
+                       mmc_hostname(host));
+                ocr &= ~0x7F;
+        }
+
+        if (ocr & MMC_VDD_165_195) {
+                printk(KERN_WARNING "%s: SD card claims to support the "
+                       "incompletely defined 'low voltage range'. This "
+                       "will be ignored.\n", mmc_hostname(host));
+                ocr &= ~MMC_VDD_165_195;
+        }
+
         host->ocr = mmc_select_voltage(host, ocr);
 
         /*
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index a57f6a3d48d..ff5bf73cdd2 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -659,8 +659,7 @@ static void sdhci_set_power(struct sdhci_host *host, unsigned short power)
         pwr = SDHCI_POWER_ON;
 
         switch (1 << power) {
-        case MMC_VDD_17_18:
-        case MMC_VDD_18_19:
+        case MMC_VDD_165_195:
                 pwr |= SDHCI_POWER_180;
                 break;
         case MMC_VDD_29_30:
@@ -1280,7 +1279,7 @@ static int __devinit sdhci_probe_slot(struct pci_dev *pdev, int slot)
         if (caps & SDHCI_CAN_VDD_300)
                 mmc->ocr_avail |= MMC_VDD_29_30|MMC_VDD_30_31;
         if (caps & SDHCI_CAN_VDD_180)
-                mmc->ocr_avail |= MMC_VDD_17_18|MMC_VDD_18_19;
+                mmc->ocr_avail |= MMC_VDD_165_195;
 
         if (mmc->ocr_avail == 0) {
                 printk(KERN_ERR "%s: Hardware doesn't report any "
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index 5a66d8a2bf1..b1350dfd3e9 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -65,14 +65,7 @@ struct mmc_host {
         unsigned int            f_max;
         u32                     ocr_avail;
 
-#define MMC_VDD_145_150         0x00000001      /* VDD voltage 1.45 - 1.50 */
-#define MMC_VDD_150_155         0x00000002      /* VDD voltage 1.50 - 1.55 */
-#define MMC_VDD_155_160         0x00000004      /* VDD voltage 1.55 - 1.60 */
-#define MMC_VDD_160_165         0x00000008      /* VDD voltage 1.60 - 1.65 */
-#define MMC_VDD_165_170         0x00000010      /* VDD voltage 1.65 - 1.70 */
-#define MMC_VDD_17_18           0x00000020      /* VDD voltage 1.7 - 1.8 */
-#define MMC_VDD_18_19           0x00000040      /* VDD voltage 1.8 - 1.9 */
-#define MMC_VDD_19_20           0x00000080      /* VDD voltage 1.9 - 2.0 */
+#define MMC_VDD_165_195         0x00000080      /* VDD voltage 1.65 - 1.95 */
 #define MMC_VDD_20_21           0x00000100      /* VDD voltage 2.0 ~ 2.1 */
 #define MMC_VDD_21_22           0x00000200      /* VDD voltage 2.1 ~ 2.2 */
 #define MMC_VDD_22_23           0x00000400      /* VDD voltage 2.2 ~ 2.3 */