[PATCH V5 6/9] usb: dwc2: gadget: Introduce register restore flags

[Stefan Wahren]

dwc2_restore_device_registers() use a single boolean
to decide about the register restoring behavior.
So replace this with a flags parameter, which can
be extended later.

No functional change intended.

Signed-off-by: Stefan Wahren <wahrenst at gmx.net>
---
 drivers/usb/dwc2/core.h   |  6 ++++--
 drivers/usb/dwc2/gadget.c | 12 +++++++-----
 2 files changed, 11 insertions(+), 7 deletions(-)

diff --git a/drivers/usb/dwc2/core.h b/drivers/usb/dwc2/core.h
index 2bd74f3033ed..48f4b639ca2f 100644
--- a/drivers/usb/dwc2/core.h
+++ b/drivers/usb/dwc2/core.h
@@ -1127,6 +1127,8 @@ struct dwc2_hsotg {
 #define DWC2_FS_IOT_ID		0x55310000
 #define DWC2_HS_IOT_ID		0x55320000

+#define DWC2_RESTORE_DCTL BIT(0)
+
 #if IS_ENABLED(CONFIG_USB_DWC2_HOST) || IS_ENABLED(CONFIG_USB_DWC2_DUAL_ROLE)
 	union dwc2_hcd_internal_flags {
 		u32 d32;
@@ -1420,7 +1422,7 @@ int dwc2_hsotg_set_test_mode(struct dwc2_hsotg *hsotg, int testmode);
 #define dwc2_is_device_connected(hsotg) (hsotg->connected)
 #define dwc2_is_device_enabled(hsotg) (hsotg->enabled)
 int dwc2_backup_device_registers(struct dwc2_hsotg *hsotg);
-int dwc2_restore_device_registers(struct dwc2_hsotg *hsotg, int remote_wakeup);
+int dwc2_restore_device_registers(struct dwc2_hsotg *hsotg, unsigned int flags);
 int dwc2_gadget_enter_hibernation(struct dwc2_hsotg *hsotg);
 int dwc2_gadget_exit_hibernation(struct dwc2_hsotg *hsotg,
 				 int rem_wakeup, int reset);
@@ -1459,7 +1461,7 @@ static inline int dwc2_hsotg_set_test_mode(struct dwc2_hsotg *hsotg,
 static inline int dwc2_backup_device_registers(struct dwc2_hsotg *hsotg)
 { return 0; }
 static inline int dwc2_restore_device_registers(struct dwc2_hsotg *hsotg,
-						int remote_wakeup)
+						unsigned int flags)
 { return 0; }
 static inline int dwc2_gadget_enter_hibernation(struct dwc2_hsotg *hsotg)
 { return 0; }
diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c
index e7bf9cc635be..96d703f4c509 100644
--- a/drivers/usb/dwc2/gadget.c
+++ b/drivers/usb/dwc2/gadget.c
@@ -5203,11 +5203,11 @@ int dwc2_backup_device_registers(struct dwc2_hsotg *hsotg)
  * if controller power were disabled.
  *
  * @hsotg: Programming view of the DWC_otg controller
- * @remote_wakeup: Indicates whether resume is initiated by Device or Host.
+ * @flags: Defines which registers should be restored.
  *
  * Return: 0 if successful, negative error code otherwise
  */
-int dwc2_restore_device_registers(struct dwc2_hsotg *hsotg, int remote_wakeup)
+int dwc2_restore_device_registers(struct dwc2_hsotg *hsotg, unsigned int flags)
 {
 	struct dwc2_dregs_backup *dr;
 	int i;
@@ -5223,7 +5223,7 @@ int dwc2_restore_device_registers(struct dwc2_hsotg *hsotg, int remote_wakeup)
 	}
 	dr->valid = false;

-	if (!remote_wakeup)
+	if (flags & DWC2_RESTORE_DCTL)
 		dwc2_writel(hsotg, dr->dctl, DCTL);

 	dwc2_writel(hsotg, dr->daintmsk, DAINTMSK);
@@ -5414,6 +5414,7 @@ int dwc2_gadget_exit_hibernation(struct dwc2_hsotg *hsotg,
 	u32 gpwrdn;
 	u32 dctl;
 	int ret = 0;
+	unsigned int flags = 0;
 	struct dwc2_gregs_backup *gr;
 	struct dwc2_dregs_backup *dr;

@@ -5476,6 +5477,7 @@ int dwc2_gadget_exit_hibernation(struct dwc2_hsotg *hsotg,
 		dctl = dwc2_readl(hsotg, DCTL);
 		dctl |= DCTL_PWRONPRGDONE;
 		dwc2_writel(hsotg, dctl, DCTL);
+		flags |= DWC2_RESTORE_DCTL;
 	}
 	/* Wait for interrupts which must be cleared */
 	mdelay(2);
@@ -5491,7 +5493,7 @@ int dwc2_gadget_exit_hibernation(struct dwc2_hsotg *hsotg,
 	}

 	/* Restore device registers */
-	ret = dwc2_restore_device_registers(hsotg, rem_wakeup);
+	ret = dwc2_restore_device_registers(hsotg, flags);
 	if (ret) {
 		dev_err(hsotg->dev, "%s: failed to restore device registers\n",
 			__func__);
@@ -5619,7 +5621,7 @@ int dwc2_gadget_exit_partial_power_down(struct dwc2_hsotg *hsotg,
 		/* Restore DCFG */
 		dwc2_writel(hsotg, dr->dcfg, DCFG);

-		ret = dwc2_restore_device_registers(hsotg, 0);
+		ret = dwc2_restore_device_registers(hsotg, DWC2_RESTORE_DCTL);
 		if (ret) {
 			dev_err(hsotg->dev, "%s: failed to restore device registers\n",
 				__func__);
--
2.34.1