[PATCH 5.10 25/49] usb: cdns3: host: add .suspend_quirk for xhci-plat.c

gregkh
2021-03-10T13:26:54Z

From: Peter Chen <peter.chen@nxp.com>

[ Upstream commit ed22764847e8100f0af9af91ccfa58e5c559bd47 ]

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

Reviewed-by: Pawel Laszczak <pawell@cadence.com>
Signed-off-by: Peter Chen <peter.chen@nxp.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/usb/cdns3/host-export.h | 6 +++++
drivers/usb/cdns3/host.c | 43 +++++++++++++++++++++++++++++++++
2 files changed, 49 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 b3e2cb69762c..de8da737fa25 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 BIT(15)
+#define LPM_2_STB_SWITCH_EN BIT(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 +73,32 @@ err1:
return ret;
}

+int xhci_cdns3_suspend_quirk(struct usb_hcd *hcd)
+{
+ struct xhci_hcd *xhci = hcd_to_xhci(hcd);
+ u32 value;
+
+ if (pm_runtime_status_suspended(hcd->self.controller))
+ return 0;
+
+ /* 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);
--
2.30.1