mmc: sdhci-msm: Add support for vendor capabilities registers

Some versions of this controller do not advertise their 3.0v and
8bit bus-width support capabilities. It is required to explicitly
set these capabilities for the specific controller versions.

Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

1 files changed, 28 insertions, 1 deletions

diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
index 3d32ce896b09..4a09f7608c66 100644
--- a/drivers/mmc/host/sdhci-msm.c
+++ b/drivers/mmc/host/sdhci-msm.c
@@ -22,6 +22,11 @@
 
 #include "sdhci-pltfm.h"
 
+#define CORE_MCI_VERSION                0x50
+#define CORE_VERSION_MAJOR_SHIFT        28
+#define CORE_VERSION_MAJOR_MASK         (0xf << CORE_VERSION_MAJOR_SHIFT)
+#define CORE_VERSION_MINOR_MASK         0xff
+
 #define CORE_HC_MODE            0x78
 #define HC_MODE_EN              0x1
 #define CORE_POWER              0x0
@@ -41,6 +46,8 @@
 #define CORE_VENDOR_SPEC        0x10c
 #define CORE_CLK_PWRSAVE        BIT(1)
 
+#define CORE_VENDOR_SPEC_CAPABILITIES0  0x11c
+
 #define CDR_SELEXT_SHIFT        20
 #define CDR_SELEXT_MASK         (0xf << CDR_SELEXT_SHIFT)
 #define CMUX_SHIFT_PHASE_SHIFT  24
@@ -426,7 +433,9 @@ static int sdhci_msm_probe(struct platform_device *pdev)
         struct sdhci_msm_host *msm_host;
         struct resource *core_memres;
         int ret;
-        u16 host_version;
+        u16 host_version, core_minor;
+        u32 core_version, caps;
+        u8 core_major;
 
         msm_host = devm_kzalloc(&pdev->dev, sizeof(*msm_host), GFP_KERNEL);
         if (!msm_host)
@@ -516,6 +525,24 @@ static int sdhci_msm_probe(struct platform_device *pdev)
                 host_version, ((host_version & SDHCI_VENDOR_VER_MASK) >>
                                SDHCI_VENDOR_VER_SHIFT));
 
+        core_version = readl_relaxed(msm_host->core_mem + CORE_MCI_VERSION);
+        core_major = (core_version & CORE_VERSION_MAJOR_MASK) >>
+                      CORE_VERSION_MAJOR_SHIFT;
+        core_minor = core_version & CORE_VERSION_MINOR_MASK;
+        dev_dbg(&pdev->dev, "MCI Version: 0x%08x, major: 0x%04x, minor: 0x%02x\n",
+                core_version, core_major, core_minor);
+
+        /*
+         * Support for some capabilities is not advertised by newer
+         * controller versions and must be explicitly enabled.
+         */
+        if (core_major >= 1 && core_minor != 0x11 && core_minor != 0x12) {
+                caps = readl_relaxed(host->ioaddr + SDHCI_CAPABILITIES);
+                caps |= SDHCI_CAN_VDD_300 | SDHCI_CAN_DO_8BIT;
+                writel_relaxed(caps, host->ioaddr +
+                               CORE_VENDOR_SPEC_CAPABILITIES0);
+        }
+
         ret = sdhci_add_host(host);
         if (ret)
                 goto clk_disable;