USB: OTG: msm: Add PHY suspend support for MSM8960

Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 54 insertions, 10 deletions

diff --git a/drivers/usb/otg/msm_otg.c b/drivers/usb/otg/msm_otg.c
index 628ba7d943da..1cdda6c05238 100644
--- a/drivers/usb/otg/msm_otg.c
+++ b/drivers/usb/otg/msm_otg.c
@@ -163,6 +163,32 @@ put_3p3:
         return rc;
 }
 
+#ifdef CONFIG_PM_SLEEP
+#define USB_PHY_SUSP_DIG_VOL  500000
+static int msm_hsusb_config_vddcx(int high)
+{
+        int max_vol = USB_PHY_VDD_DIG_VOL_MAX;
+        int min_vol;
+        int ret;
+
+        if (high)
+                min_vol = USB_PHY_VDD_DIG_VOL_MIN;
+        else
+                min_vol = USB_PHY_SUSP_DIG_VOL;
+
+        ret = regulator_set_voltage(hsusb_vddcx, min_vol, max_vol);
+        if (ret) {
+                pr_err("%s: unable to set the voltage for regulator "
+                        "HSUSB_VDDCX\n", __func__);
+                return ret;
+        }
+
+        pr_debug("%s: min_vol:%d max_vol:%d\n", __func__, min_vol, max_vol);
+
+        return ret;
+}
+#endif
+
 static int msm_hsusb_ldo_set_mode(int on)
 {
         int ret = 0;
@@ -434,27 +460,28 @@ static int msm_otg_suspend(struct msm_otg *motg)
 
         disable_irq(motg->irq);
         /*
+         * Chipidea 45-nm PHY suspend sequence:
+         *
          * Interrupt Latch Register auto-clear feature is not present
          * in all PHY versions. Latch register is clear on read type.
          * Clear latch register to avoid spurious wakeup from
          * low power mode (LPM).
-         */
-        ulpi_read(otg, 0x14);
-
-        /*
+         *
          * PHY comparators are disabled when PHY enters into low power
          * mode (LPM). Keep PHY comparators ON in LPM only when we expect
          * VBUS/Id notifications from USB PHY. Otherwise turn off USB
          * PHY comparators. This save significant amount of power.
-         */
-        if (pdata->otg_control == OTG_PHY_CONTROL)
-                ulpi_write(otg, 0x01, 0x30);
-
-        /*
+         *
          * PLL is not turned off when PHY enters into low power mode (LPM).
          * Disable PLL for maximum power savings.
          */
-        ulpi_write(otg, 0x08, 0x09);
+
+        if (motg->pdata->phy_type == CI_45NM_INTEGRATED_PHY) {
+                ulpi_read(otg, 0x14);
+                if (pdata->otg_control == OTG_PHY_CONTROL)
+                        ulpi_write(otg, 0x01, 0x30);
+                ulpi_write(otg, 0x08, 0x09);
+        }
 
         /*
          * PHY may take some time or even fail to enter into low power
@@ -485,6 +512,10 @@ static int msm_otg_suspend(struct msm_otg *motg)
          */
         writel(readl(USB_USBCMD) | ASYNC_INTR_CTRL | ULPI_STP_CTRL, USB_USBCMD);
 
+        if (motg->pdata->phy_type == SNPS_28NM_INTEGRATED_PHY &&
+                        motg->pdata->otg_control == OTG_PMIC_CONTROL)
+                writel(readl(USB_PHY_CTRL) | PHY_RETEN, USB_PHY_CTRL);
+
         clk_disable(motg->pclk);
         clk_disable(motg->clk);
         if (motg->core_clk)
@@ -493,6 +524,12 @@ static int msm_otg_suspend(struct msm_otg *motg)
         if (!IS_ERR(motg->pclk_src))
                 clk_disable(motg->pclk_src);
 
+        if (motg->pdata->phy_type == SNPS_28NM_INTEGRATED_PHY &&
+                        motg->pdata->otg_control == OTG_PMIC_CONTROL) {
+                msm_hsusb_ldo_set_mode(0);
+                msm_hsusb_config_vddcx(0);
+        }
+
         if (device_may_wakeup(otg->dev))
                 enable_irq_wake(motg->irq);
         if (bus)
@@ -524,6 +561,13 @@ static int msm_otg_resume(struct msm_otg *motg)
         if (motg->core_clk)
                 clk_enable(motg->core_clk);
 
+        if (motg->pdata->phy_type == SNPS_28NM_INTEGRATED_PHY &&
+                        motg->pdata->otg_control == OTG_PMIC_CONTROL) {
+                msm_hsusb_ldo_set_mode(1);
+                msm_hsusb_config_vddcx(1);
+                writel(readl(USB_PHY_CTRL) & ~PHY_RETEN, USB_PHY_CTRL);
+        }
+
         temp = readl(USB_USBCMD);
         temp &= ~ASYNC_INTR_CTRL;
         temp &= ~ULPI_STP_CTRL;