mmc: sdhci-msm: Add support to store supported vdd-io voltages

During probe check whether the vdd-io regulator of sdhc platform device
can support 1.8V and 3V and store this information as a capability of
platform device.

Signed-off-by: Vijay Viswanath <vviswana@codeaurora.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Acked-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
index c283291db705238dab53ee0104808a198aa4288e..edd30a23d36b0bfe4483e84fd4b20a106a199cb9 100644 (file)
--- a/drivers/mmc/host/sdhci-msm.c
+++ b/drivers/mmc/host/sdhci-msm.c
@@ -21,6 +21,7 @@
 #include <linux/pm_runtime.h>
 #include <linux/slab.h>
 #include <linux/iopoll.h>
+#include <linux/regulator/consumer.h>
 
 #include "sdhci-pltfm.h"
 
@@ -81,6 +82,9 @@
 #define CORE_HC_SELECT_IN_HS400        (6 << 19)
 #define CORE_HC_SELECT_IN_MASK (7 << 19)
 
+#define CORE_3_0V_SUPPORT      (1 << 25)
+#define CORE_1_8V_SUPPORT      (1 << 26)
+
 #define CORE_CSR_CDC_CTLR_CFG0         0x130
 #define CORE_SW_TRIG_FULL_CALIB                BIT(16)
 #define CORE_HW_AUTOCAL_ENA            BIT(17)
@@ -148,6 +152,7 @@ struct sdhci_msm_host {
        u32 curr_io_level;
        wait_queue_head_t pwr_irq_wait;
        bool pwr_irq_flag;
+       u32 caps_0;
 };
 
 static unsigned int msm_get_clock_rate_for_bus_mode(struct sdhci_host *host,
@@ -1103,7 +1108,7 @@ static void sdhci_msm_handle_pwr_irq(struct sdhci_host *host, int irq)
        struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
        u32 irq_status, irq_ack = 0;
        int retry = 10;
-       int pwr_state = 0, io_level = 0;
+       u32 pwr_state = 0, io_level = 0;
 
 
        irq_status = readl_relaxed(msm_host->core_mem + CORE_PWRCTL_STATUS);
@@ -1313,6 +1318,27 @@ static void sdhci_msm_writeb(struct sdhci_host *host, u8 val, int reg)
                sdhci_msm_check_power_status(host, req_type);
 }
 
+static void sdhci_msm_set_regulator_caps(struct sdhci_msm_host *msm_host)
+{
+       struct mmc_host *mmc = msm_host->mmc;
+       struct regulator *supply = mmc->supply.vqmmc;
+       u32 caps = 0;
+
+       if (!IS_ERR(mmc->supply.vqmmc)) {
+               if (regulator_is_supported_voltage(supply, 1700000, 1950000))
+                       caps |= CORE_1_8V_SUPPORT;
+               if (regulator_is_supported_voltage(supply, 2700000, 3600000))
+                       caps |= CORE_3_0V_SUPPORT;
+
+               if (!caps)
+                       pr_warn("%s: 1.8/3V not supported for vqmmc\n",
+                                       mmc_hostname(mmc));
+       }
+
+       msm_host->caps_0 |= caps;
+       pr_debug("%s: supported caps: 0x%08x\n", mmc_hostname(mmc), caps);
+}
+
 static const struct of_device_id sdhci_msm_dt_match[] = {
        { .compatible = "qcom,sdhci-msm-v4" },
        {},
@@ -1530,6 +1556,7 @@ static int sdhci_msm_probe(struct platform_device *pdev)
        ret = sdhci_add_host(host);
        if (ret)
                goto pm_runtime_disable;
+       sdhci_msm_set_regulator_caps(msm_host);
 
        pm_runtime_mark_last_busy(&pdev->dev);
        pm_runtime_put_autosuspend(&pdev->dev);