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Date: Mon, 16 May 2022 10:13:27 +0530
From: Pavan Kondeti <quic_pkondeti@...cinc.com>
To: Krishna Kurapati PSSNV <quic_kriskura@...cinc.com>
CC: Matthias Kaehlcke <mka@...omium.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Rob Herring <robh+dt@...nel.org>,
"Andy Gross" <agross@...nel.org>,
Bjorn Andersson <bjorn.andersson@...aro.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Felipe Balbi <balbi@...nel.org>,
Stephen Boyd <swboyd@...omium.org>,
Doug Anderson <dianders@...omium.org>,
Mathias Nyman <mathias.nyman@...el.com>,
<devicetree@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
<linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<linux-pm@...r.kernel.org>, <quic_pkondeti@...cinc.com>,
<quic_ppratap@...cinc.com>, <quic_vpulyala@...cinc.com>,
Sandeep Maheswaram <quic_c_sanm@...cinc.com>
Subject: Re: [v16 2/5] usb: dwc3: core: Host wake up support from system
suspend
On Fri, May 13, 2022 at 09:28:16AM +0530, Krishna Kurapati PSSNV wrote:
>
> On 5/13/2022 4:10 AM, Matthias Kaehlcke wrote:
> >On Thu, May 12, 2022 at 11:53:19PM +0530, Krishna Kurapati wrote:
> >>From: Sandeep Maheswaram <quic_c_sanm@...cinc.com>
> >>
> >>During suspend read the status of all port and set hs phy mode
> >>based on current speed. Use this hs phy mode to configure wakeup
> >>interrupts in qcom glue driver.
> >>
> >>Check wakeup-source property for dwc3 core node to set the
> >>wakeup capability. Drop the device_init_wakeup call from
> >>runtime suspend and resume.
> >>
> >>Also check during suspend if any wakeup capable devices are
> >>connected to the controller (directly or through hubs), if there
> >>are none set a flag to indicate that the PHY is powered
> >>down during suspend.
> >>
> >>Signed-off-by: Sandeep Maheswaram <quic_c_sanm@...cinc.com>
> >>Signed-off-by: Krishna Kurapati <quic_kriskura@...cinc.com>
> >>---
> >> drivers/usb/dwc3/core.c | 30 +++++++++++++++++-------------
> >> drivers/usb/dwc3/core.h | 4 ++++
> >> drivers/usb/dwc3/host.c | 24 ++++++++++++++++++++++++
> >> 3 files changed, 45 insertions(+), 13 deletions(-)
> >>
> >>diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
> >>index 01115df..8bcabc5 100644
> >>--- a/drivers/usb/dwc3/core.c
> >>+++ b/drivers/usb/dwc3/core.c
> >>@@ -1785,6 +1785,7 @@ static int dwc3_probe(struct platform_device *pdev)
> >> platform_set_drvdata(pdev, dwc);
> >> dwc3_cache_hwparams(dwc);
> >>+ device_init_wakeup(&pdev->dev, of_property_read_bool(dev->of_node, "wakeup-source"));
> >> spin_lock_init(&dwc->lock);
> >> mutex_init(&dwc->mutex);
> >>@@ -1946,10 +1947,7 @@ static int dwc3_suspend_common(struct dwc3 *dwc, pm_message_t msg)
> >> dwc3_core_exit(dwc);
> >> break;
> >> case DWC3_GCTL_PRTCAP_HOST:
> >>- if (!PMSG_IS_AUTO(msg)) {
> >>- dwc3_core_exit(dwc);
> >>- break;
> >>- }
> >>+ dwc3_check_phy_speed_mode(dwc);
> >> /* Let controller to suspend HSPHY before PHY driver suspends */
> >> if (dwc->dis_u2_susphy_quirk ||
> >>@@ -1965,6 +1963,15 @@ static int dwc3_suspend_common(struct dwc3 *dwc, pm_message_t msg)
> >> phy_pm_runtime_put_sync(dwc->usb2_generic_phy);
> >> phy_pm_runtime_put_sync(dwc->usb3_generic_phy);
> >>+
> >>+ if (!PMSG_IS_AUTO(msg)) {
> >>+ if (device_may_wakeup(dwc->dev))
> >I think this should be device_can_wakeup(), i.e. hardware capability instead of
> >device policy. A drawback of powering the PHYs off is that it causes a high
> >power consumption of certain peripherals if VBUS is still supplied, so this
> >should be limited to platforms where the PHYs must be powered off (using wakeup
> >capability as a proxy for now).
> Thnaks Mathias for the review. Will make this change in the next patchset.
> >>+ dwc->phy_power_off = false;
> >>+ else {
> >>+ dwc->phy_power_off = true;
> >>+ dwc3_core_exit(dwc);
> >>+ }
> >>+ }
> >> break;
> >> case DWC3_GCTL_PRTCAP_OTG:
> >> /* do nothing during runtime_suspend */
> >>@@ -2008,11 +2015,12 @@ static int dwc3_resume_common(struct dwc3 *dwc, pm_message_t msg)
> >> break;
> >> case DWC3_GCTL_PRTCAP_HOST:
> >> if (!PMSG_IS_AUTO(msg)) {
> >>- ret = dwc3_core_init_for_resume(dwc);
> >>- if (ret)
> >>- return ret;
> >>- dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_HOST);
> >>- break;
> >>+ if (dwc->phy_power_off) {
> >>+ ret = dwc3_core_init_for_resume(dwc);
> >>+ if (ret)
> >>+ return ret;
> >>+ dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_HOST);
> >>+ }
> >> }
> >> /* Restore GUSB2PHYCFG bits that were modified in suspend */
> >> reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
> >>@@ -2084,8 +2092,6 @@ static int dwc3_runtime_suspend(struct device *dev)
> >> if (ret)
> >> return ret;
> >>- device_init_wakeup(dev, true);
> >>-
> >> return 0;
> >> }
> >>@@ -2094,8 +2100,6 @@ static int dwc3_runtime_resume(struct device *dev)
> >> struct dwc3 *dwc = dev_get_drvdata(dev);
> >> int ret;
> >>- device_init_wakeup(dev, false);
> >>-
> >> ret = dwc3_resume_common(dwc, PMSG_AUTO_RESUME);
> >> if (ret)
> >> return ret;
> >>diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
> >>index 81c486b..37397a8 100644
> >>--- a/drivers/usb/dwc3/core.h
> >>+++ b/drivers/usb/dwc3/core.h
> >>@@ -1155,6 +1155,9 @@ struct dwc3 {
> >> bool phys_ready;
> >>+ unsigned int hs_phy_mode;
> >>+ bool phy_power_off;
> >>+
> >> struct ulpi *ulpi;
> >> bool ulpi_ready;
> >>@@ -1539,6 +1542,7 @@ int dwc3_core_soft_reset(struct dwc3 *dwc);
> >> #if IS_ENABLED(CONFIG_USB_DWC3_HOST) || IS_ENABLED(CONFIG_USB_DWC3_DUAL_ROLE)
> >> int dwc3_host_init(struct dwc3 *dwc);
> >> void dwc3_host_exit(struct dwc3 *dwc);
> >>+void dwc3_check_phy_speed_mode(struct dwc3 *dwc);
> >> #else
> >> static inline int dwc3_host_init(struct dwc3 *dwc)
> >> { return 0; }
> >>diff --git a/drivers/usb/dwc3/host.c b/drivers/usb/dwc3/host.c
> >>index f56c30c..e19b40a 100644
> >>--- a/drivers/usb/dwc3/host.c
> >>+++ b/drivers/usb/dwc3/host.c
> >>@@ -12,6 +12,7 @@
> >> #include <linux/platform_device.h>
> >> #include "core.h"
> >>+#include "../host/xhci.h"
> >> static void dwc3_host_fill_xhci_irq_res(struct dwc3 *dwc,
> >> int irq, char *name)
> >>@@ -136,3 +137,26 @@ void dwc3_host_exit(struct dwc3 *dwc)
> >> {
> >> platform_device_unregister(dwc->xhci);
> >> }
> >>+
> >>+void dwc3_check_phy_speed_mode(struct dwc3 *dwc)
> >>+{
> >>+ int i, num_ports;
> >>+ u32 reg;
> >>+ struct usb_hcd *hcd = platform_get_drvdata(dwc->xhci);
> >>+ 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 * NUM_PORT_REGS);
> >>+ 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;
> >>+ }
> >>+ }
> >>+}
> >I anticipate that it might raise concerns from maintainers that
> >dwc3_check_phy_speed_mode() accesses xHCI data structures and
> >registers directly. Could there be a generic HCD API that provides
> >this functionality (if implemented by the specific HCD)?
>
> Hi Mathias, we are not sure if there is any such API present currently.
>
> Hi Alan, can you help suggest any API (if present) that we can reuse here to
> avoid
>
> xhci registers and structs here in dwc3.
>
We can probably do something like below to query the speed. This avoids adding
another API and does not touch the underlying registers.
Pls define enum usb_device_speed usb2_speed in dwc3 structure.
diff --git a/drivers/usb/dwc3/host.c b/drivers/usb/dwc3/host.c
index f29a264..fed1c58 100644
--- a/drivers/usb/dwc3/host.c
+++ b/drivers/usb/dwc3/host.c
@@ -9,9 +9,29 @@
#include <linux/acpi.h>
#include <linux/platform_device.h>
+#include <linux/usb.h>
#include "core.h"
+void dwc3_update_hs_phy_speed(struct dwc3 *dwc)
+{
+ struct usb_hcd *hcd = platform_get_drvdata(dwc->xhci);
+ struct usb_device *udev;
+
+ /*
+ * It is possible to query the speed of all children of
+ * USB2.0 root hub via usb_hub_for_each_child(). DWC3 code
+ * currently supports only 1 port per controller. So
+ * this is sufficient.
+ */
+ udev = usb_hub_find_child(hcd->self.root_hub, 1);
+
+ if (udev)
+ dwc->usb2_speed = udev->speed;
+ else
+ dwc->usb2_speed = USB_SPEED_UNKNOWN;
+}
+
static int dwc3_host_get_irq(struct dwc3 *dwc)
{
struct platform_device *dwc3_pdev = to_platform_device(dwc->dev);
Thanks,
Pavan
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