usb: dwc2: Backup and restore PCGCCTL1 register

Backup PCGCCTL1 register when entering hibernation mode and
restore it after exiting from hibernation, to keep active ACG
feature.

Signed-off-by: Razmik Karapetyan <razmik@synopsys.com>
Signed-off-by: Grigor Tovmasyan <tovmasya@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

drivers/usb/dwc2/core.c

@@ -80,6 +80,7 @@ static int dwc2_backup_global_registers(struct dwc2_hsotg *hsotg)
 	gr->gnptxfsiz = dwc2_readl(hsotg->regs + GNPTXFSIZ);
 	gr->hptxfsiz = dwc2_readl(hsotg->regs + HPTXFSIZ);
 	gr->gdfifocfg = dwc2_readl(hsotg->regs + GDFIFOCFG);
+	gr->pcgcctl1 = dwc2_readl(hsotg->regs + PCGCCTL1);
 	for (i = 0; i < MAX_EPS_CHANNELS; i++)
 		gr->dtxfsiz[i] = dwc2_readl(hsotg->regs + DPTXFSIZN(i));
 
@@ -119,6 +120,7 @@ static int dwc2_restore_global_registers(struct dwc2_hsotg *hsotg)
 	dwc2_writel(gr->gnptxfsiz, hsotg->regs + GNPTXFSIZ);
 	dwc2_writel(gr->hptxfsiz, hsotg->regs + HPTXFSIZ);
 	dwc2_writel(gr->gdfifocfg, hsotg->regs + GDFIFOCFG);
+	dwc2_writel(gr->pcgcctl1, hsotg->regs + PCGCCTL1);
 	for (i = 0; i < MAX_EPS_CHANNELS; i++)
 		dwc2_writel(gr->dtxfsiz[i], hsotg->regs + DPTXFSIZN(i));
 

drivers/usb/dwc2/core.h

@@ -628,6 +628,7 @@ struct dwc2_gregs_backup {
 	u32 gi2cctl;
 	u32 hptxfsiz;
 	u32 pcgcctl;
+	u32 pcgcctl1;
 	u32 gdfifocfg;
 	u32 dtxfsiz[MAX_EPS_CHANNELS];
 	u32 gpwrdn;