[PATCH 1/2] usb: chipidea: add ci_hdrc_enter_lpm API

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It is used to let the PHY enters low power mode at
controller suspend routine.

Signed-off-by: Peter Chen <peter.chen@xxxxxxxxxxxxx>
---
 drivers/usb/chipidea/bits.h  |    1 +
 drivers/usb/chipidea/core.c  |   14 ++++++++++++++
 include/linux/usb/chipidea.h |    1 +
 3 files changed, 16 insertions(+), 0 deletions(-)

diff --git a/drivers/usb/chipidea/bits.h b/drivers/usb/chipidea/bits.h
index dd0cf9e..9f936a3 100644
--- 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)						\
 	((((d) & 0x3) << 30) | (((d) & 0x4) ? BIT(25) : 0))
diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c
index c47a6b4..a68e281 100644
--- a/drivers/usb/chipidea/core.c
+++ b/drivers/usb/chipidea/core.c
@@ -451,6 +451,20 @@ void ci_hdrc_remove_device(struct platform_device *pdev)
 }
 EXPORT_SYMBOL_GPL(ci_hdrc_remove_device);
 
+void ci_hdrc_enter_lpm(struct platform_device *pdev, bool enable)
+{
+	struct ci_hdrc *ci = platform_get_drvdata(pdev);
+	enum ci_hw_regs reg = ci->hw_bank.lpm ? OP_DEVLC : OP_PORTSC;
+
+	if (enable)
+		hw_write(ci, reg, PORTSC_PHCD(ci->hw_bank.lpm),
+				PORTSC_PHCD(ci->hw_bank.lpm));
+	else
+		hw_write(ci, reg, PORTSC_PHCD(ci->hw_bank.lpm),
+				0);
+}
+EXPORT_SYMBOL_GPL(ci_hdrc_enter_lpm);
+
 static inline void ci_role_destroy(struct ci_hdrc *ci)
 {
 	ci_hdrc_gadget_destroy(ci);
diff --git a/include/linux/usb/chipidea.h b/include/linux/usb/chipidea.h
index 7d39967..0263730 100644
--- a/include/linux/usb/chipidea.h
+++ b/include/linux/usb/chipidea.h
@@ -41,4 +41,5 @@ struct platform_device *ci_hdrc_add_device(struct device *dev,
 /* Remove ci hdrc device */
 void ci_hdrc_remove_device(struct platform_device *pdev);
 
+void ci_hdrc_enter_lpm(struct platform_device *pdev, bool enable);
 #endif
-- 
1.7.1


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