RE: [PATCH v5 8/9] usb: cdns3: host: add .suspend_quirk for xhci-plat.c

cdns3 has some special PM sequence between xhci_bus_suspend and
xhci_suspend, add quirk to implement it.

Signed-off-by: Peter Chen <redacted>
---
drivers/usb/cdns3/host-export.h |  6 +++++
drivers/usb/cdns3/host.c        | 40 +++++++++++++++++++++++++++++++++
2 files changed, 46 insertions(+)

diff --git a/drivers/usb/cdns3/host-export.h b/drivers/usb/cdns3/host-export.h
index ae11810f8826..26041718a086 100644
--- a/drivers/usb/cdns3/host-export.h
+++ b/drivers/usb/cdns3/host-export.h

@@ -9,9 +9,11 @@

#ifndef __LINUX_CDNS3_HOST_EXPORT
#define __LINUX_CDNS3_HOST_EXPORT

+struct usb_hcd;
#ifdef CONFIG_USB_CDNS3_HOST

int cdns3_host_init(struct cdns3 *cdns);
+int xhci_cdns3_suspend_quirk(struct usb_hcd *hcd);

#else

@@ -21,6 +23,10 @@ static inline int cdns3_host_init(struct cdns3 *cdns)

}

static inline void cdns3_host_exit(struct cdns3 *cdns) { }
+static inline int xhci_cdns3_suspend_quirk(struct usb_hcd *hcd)
+{
+	return 0;
+}

#endif /* CONFIG_USB_CDNS3_HOST */

diff --git a/drivers/usb/cdns3/host.c b/drivers/usb/cdns3/host.c
index b579ef15f4e0..030d6421abd3 100644
--- a/drivers/usb/cdns3/host.c
+++ b/drivers/usb/cdns3/host.c

@@ -14,6 +14,18 @@

#include "drd.h"
#include "host-export.h"
#include <linux/usb/hcd.h>
+#include "../host/xhci.h"
+#include "../host/xhci-plat.h"
+
+#define XECP_PORT_CAP_REG	0x8000
+#define XECP_AUX_CTRL_REG1	0x8120
+
+#define CFG_RXDET_P3_EN		(1 << 15)
+#define LPM_2_STB_SWITCH_EN	(1 << 25)
+

+static const struct xhci_plat_priv xhci_plat_cdns3_xhci = {
+	.suspend_quirk = xhci_cdns3_suspend_quirk,
+};

static int __cdns3_host_init(struct cdns3 *cdns)
{

@@ -39,6 +51,11 @@ static int __cdns3_host_init(struct cdns3 *cdns)

		goto err1;
	}

+	ret = platform_device_add_data(xhci, &xhci_plat_cdns3_xhci,
+			sizeof(struct xhci_plat_priv));
+	if (ret)
+		goto err1;
+
	ret = platform_device_add(xhci);
	if (ret) {
		dev_err(cdns->dev, "failed to register xHCI device\n");

@@ -56,6 +73,29 @@ static int __cdns3_host_init(struct cdns3 *cdns)

	return ret;
}

+int xhci_cdns3_suspend_quirk(struct usb_hcd *hcd)
+{
+	struct xhci_hcd	*xhci = hcd_to_xhci(hcd);
+	u32 value;
+
+	/* set usbcmd.EU3S */
+	value = readl(&xhci->op_regs->command);
+	value |= CMD_PM_INDEX;
+	writel(value, &xhci->op_regs->command);
+
+	if (hcd->regs) {
+		value = readl(hcd->regs + XECP_AUX_CTRL_REG1);
+		value |= CFG_RXDET_P3_EN;
+		writel(value, hcd->regs + XECP_AUX_CTRL_REG1);
+
+		value = readl(hcd->regs + XECP_PORT_CAP_REG);
+		value |= LPM_2_STB_SWITCH_EN;
+		writel(value, hcd->regs + XECP_PORT_CAP_REG);
+	}
+
+	return 0;
+}
+
static void cdns3_host_exit(struct cdns3 *cdns)
{
	platform_device_unregister(cdns->host_dev);
--
2.17.1