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@xxxxxxxxxx>
---
Changes since v1:
* Converted to separate read, modify, write statements.
* Slightly updated comment text.
Tested on msm8916-mtp board.
drivers/mmc/host/sdhci-msm.c | 31 ++++++++++++++++++++++++++++++-
1 file changed, 30 insertions(+), 1 deletion(-)
diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
index 3d32ce896b09..b87f271ede29 100644
--- a/drivers/mmc/host/sdhci-msm.c
+++ b/drivers/mmc/host/sdhci-msm.c
@@ -41,6 +41,15 @@
#define CORE_VENDOR_SPEC 0x10c
#define CORE_CLK_PWRSAVE BIT(1)
+#define CORE_MCI_VERSION 0x050
+#define CORE_VERSION_MAJOR_SHIFT 28
+#define CORE_VERSION_MAJOR_MASK (0xf << CORE_VERSION_MAJOR_SHIFT)
+#define CORE_VERSION_MINOR_MASK 0xff
+
+#define CORE_VENDOR_SPEC_CAPABILITIES0 0x11c
+#define CORE_8_BIT_SUPPORT BIT(18)
+#define CORE_3_0V_SUPPORT BIT(25)
+
#define CDR_SELEXT_SHIFT 20
#define CDR_SELEXT_MASK (0xf << CDR_SELEXT_SHIFT)
#define CMUX_SHIFT_PHASE_SHIFT 24
@@ -426,7 +435,9 @@ 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 +527,24 @@ 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 |= CORE_3_0V_SUPPORT | CORE_8_BIT_SUPPORT;
+ writel_relaxed(caps, host->ioaddr +
+ CORE_VENDOR_SPEC_CAPABILITIES0);
+ }
+
ret = sdhci_add_host(host);
if (ret)
goto clk_disable;
--
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