[PATCH v5 2/4] usb: dwc3: host: Add suspend_quirk for dwc3 host

Sandeep Maheswaram
2021-03-22T17:33:08Z

Adding suspend quirk function for dwc3 host which will be called
during xhci suspend.
Setting hs_phy_mode, ss_phy_mode , phy_power_off flags and phy mode
during host suspend.

Signed-off-by: Sandeep Maheswaram <sanm@codeaurora.org>
---
drivers/usb/dwc3/core.h | 3 +++
drivers/usb/dwc3/host.c | 58 +++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 61 insertions(+)

diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index ce6bd84..f05546c 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -1113,6 +1113,9 @@ struct dwc3 {

bool phys_ready;

+ unsigned int hs_phy_mode;
+ bool phy_power_off;
+
struct ulpi *ulpi;
bool ulpi_ready;

diff --git a/drivers/usb/dwc3/host.c b/drivers/usb/dwc3/host.c
index f29a264..3db042c 100644
--- a/drivers/usb/dwc3/host.c
+++ b/drivers/usb/dwc3/host.c
@@ -11,6 +11,13 @@
#include <linux/platform_device.h>

#include "core.h"
+#include "../host/xhci.h"
+#include "../host/xhci-plat.h"
+int xhci_dwc3_suspend_quirk(struct usb_hcd *hcd);
+
+static const struct xhci_plat_priv xhci_plat_dwc3_xhci = {
+ .suspend_quirk = xhci_dwc3_suspend_quirk,
+};

static int dwc3_host_get_irq(struct dwc3 *dwc)
{
@@ -115,6 +122,13 @@ int dwc3_host_init(struct dwc3 *dwc)
}
}

+ ret = platform_device_add_data(xhci, &xhci_plat_dwc3_xhci,
+ sizeof(struct xhci_plat_priv));
+ if (ret) {
+ dev_err(dwc->dev, "failed to add data to xHCI\n");
+ goto err;
+ }
+
ret = platform_device_add(xhci);
if (ret) {
dev_err(dwc->dev, "failed to register xHCI device\n");
@@ -127,6 +141,50 @@ int dwc3_host_init(struct dwc3 *dwc)
return ret;
}

+static void dwc3_set_phy_mode(struct usb_hcd *hcd)
+{
+
+ int i, num_ports;
+ u32 reg;
+ unsigned int ss_phy_mode = 0;
+ struct dwc3 *dwc = dev_get_drvdata(hcd->self.controller->parent);
+ struct xhci_hcd *xhci_hcd = hcd_to_xhci(hcd);
+
+ dwc->hs_phy_mode = 0;
+
+ reg = readl(&xhci_hcd->cap_regs->hcs_params1);
+
+ num_ports = HCS_MAX_PORTS(reg);
+ for (i = 0; i < num_ports; i++) {
+ reg = readl(&xhci_hcd->op_regs->port_status_base + i * 0x04);
+ if (reg & PORT_PE) {
+ if (DEV_HIGHSPEED(reg) || DEV_FULLSPEED(reg))
+ dwc->hs_phy_mode |= PHY_MODE_USB_HOST_HS;
+ else if (DEV_LOWSPEED(reg))
+ dwc->hs_phy_mode |= PHY_MODE_USB_HOST_LS;
+
+ if (DEV_SUPERSPEED(reg))
+ ss_phy_mode |= PHY_MODE_USB_HOST_SS;
+ }
+ }
+ phy_set_mode(dwc->usb2_generic_phy, dwc->hs_phy_mode);
+ phy_set_mode(dwc->usb3_generic_phy, ss_phy_mode);
+}
+
+int xhci_dwc3_suspend_quirk(struct usb_hcd *hcd)
+{
+ struct dwc3 *dwc = dev_get_drvdata(hcd->self.controller->parent);
+
+ dwc3_set_phy_mode(hcd);
+
+ dwc->phy_power_off = true;
+
+ if (usb_wakeup_enabled_descendants(hcd->self.root_hub))
+ dwc->phy_power_off = false;
+
+ return 0;
+}
+
void dwc3_host_exit(struct dwc3 *dwc)
{
platform_device_unregister(dwc->xhci);
--
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