usb: chipidea: add ci_hdrc_enter_lpm API

This API is used to let the PHY enter/leave low power mode.
Before the controller going to work(at probe/resume), it needs to let
the PHY leave low power mode.
After the controller stopping working(at remove/suspend), it needs to
let the PHY enter low power mode to save power consumption.

Signed-off-by: Peter Chen <peter.chen@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/chipidea/bits.h b/drivers/usb/chipidea/bits.h
index 464584c..a857131 100644 (file)
--- a/drivers/usb/chipidea/bits.h
+++ b/drivers/usb/chipidea/bits.h
@@ -48,6 +48,7 @@
 #define PORTSC_SUSP           BIT(7)
 #define PORTSC_HSP            BIT(9)
 #define PORTSC_PTC            (0x0FUL << 16)
+#define PORTSC_PHCD(d)       ((d) ? BIT(22) : BIT(23))
 /* PTS and PTW for non lpm version only */
 #define PORTSC_PTS(d)                                          \
        (u32)((((d) & 0x3) << 30) | (((d) & 0x4) ? BIT(25) : 0))

diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c
index b20286d..06204b7 100644 (file)
--- a/drivers/usb/chipidea/core.c
+++ b/drivers/usb/chipidea/core.c
@@ -172,6 +172,27 @@ u8 hw_port_test_get(struct ci_hdrc *ci)
        return hw_read(ci, OP_PORTSC, PORTSC_PTC) >> __ffs(PORTSC_PTC);
 }
 
+/* The PHY enters/leaves low power mode */
+static void ci_hdrc_enter_lpm(struct ci_hdrc *ci, bool enable)
+{
+       enum ci_hw_regs reg = ci->hw_bank.lpm ? OP_DEVLC : OP_PORTSC;
+       bool lpm = !!(hw_read(ci, reg, PORTSC_PHCD(ci->hw_bank.lpm)));
+
+       if (enable && !lpm) {
+               hw_write(ci, reg, PORTSC_PHCD(ci->hw_bank.lpm),
+                               PORTSC_PHCD(ci->hw_bank.lpm));
+       } else  if (!enable && lpm) {
+               hw_write(ci, reg, PORTSC_PHCD(ci->hw_bank.lpm),
+                               0);
+               /* 
+                * The controller needs at least 1ms to reflect
+                * PHY's status, the PHY also needs some time (less
+                * than 1ms) to leave low power mode.
+                */
+               usleep_range(1500, 2000);
+       }
+}
+
 static int hw_device_init(struct ci_hdrc *ci, void __iomem *base)
 {
        u32 reg;
@@ -199,6 +220,8 @@ static int hw_device_init(struct ci_hdrc *ci, void __iomem *base)
        if (ci->hw_ep_max > ENDPT_MAX)
                return -ENODEV;
 
+       ci_hdrc_enter_lpm(ci, false);
+
        /* Disable all interrupts bits */
        hw_write(ci, OP_USBINTR, 0xffffffff, 0);
 
@@ -648,6 +671,7 @@ static int ci_hdrc_remove(struct platform_device *pdev)
        dbg_remove_files(ci);
        free_irq(ci->irq, ci);
        ci_role_destroy(ci);
+       ci_hdrc_enter_lpm(ci, true);
        ci_usb_phy_destroy(ci);
        kfree(ci->hw_bank.regmap);