Messages in this thread | | | Date | Mon, 23 Oct 2023 22:57:04 +0530 | Subject | Re: [PATCH v13 06/10] usb: dwc3: qcom: Enable wakeup for applicable ports of multiport | From | Krishna Kurapati PSSNV <> |
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On 10/23/2023 9:17 PM, Johan Hovold wrote: > On Sat, Oct 07, 2023 at 09:18:02PM +0530, Krishna Kurapati wrote: >> Currently wakeup is supported by only single port controllers. Read speed >> of each port and accordingly enable IRQ's for those ports. >> >> Signed-off-by: Krishna Kurapati <quic_kriskura@quicinc.com> >> --- >> drivers/usb/dwc3/dwc3-qcom.c | 65 +++++++++++++++++++----------------- >> 1 file changed, 35 insertions(+), 30 deletions(-) >> >> diff --git a/drivers/usb/dwc3/dwc3-qcom.c b/drivers/usb/dwc3/dwc3-qcom.c >> index 863892284146..651b9775a0c2 100644 >> --- a/drivers/usb/dwc3/dwc3-qcom.c >> +++ b/drivers/usb/dwc3/dwc3-qcom.c >> @@ -90,7 +90,7 @@ struct dwc3_qcom { >> */ >> int phy_irq[NUM_PHY_IRQ - 1][DWC3_MAX_PORTS]; >> int hs_phy_irq; >> - enum usb_device_speed usb2_speed; >> + enum usb_device_speed usb2_speed[DWC3_MAX_PORTS]; > > This also belongs in a new port structure. > >> struct extcon_dev *edev; >> struct extcon_dev *host_edev; >> @@ -335,7 +335,8 @@ static bool dwc3_qcom_is_host(struct dwc3_qcom *qcom) >> return dwc->xhci; >> } >> >> -static enum usb_device_speed dwc3_qcom_read_usb2_speed(struct dwc3_qcom *qcom) >> +static enum usb_device_speed dwc3_qcom_read_usb2_speed(struct dwc3_qcom *qcom, >> + int port_index) > > No need for line break (since it's a function definition). > >> { >> struct dwc3 *dwc = platform_get_drvdata(qcom->dwc3); >> struct usb_device *udev; >> @@ -348,12 +349,10 @@ static enum usb_device_speed dwc3_qcom_read_usb2_speed(struct dwc3_qcom *qcom) >> >> /* >> * 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. >> + * USB2.0 root hub via usb_hub_for_each_child(). > > This comment no longer makes sense with your current implementation. > Can you help elaborate on your comment ? Do you mean that this API doesn't get speed on all ports, but this has to be called in a loop to get all the port speeds ? In that sense, I agree, I can change the comments here.
> But perhaps this should be done using usb_hub_for_each_child() instead > as that may be more efficient. Then you use this function to read out > the speed for all the ports in go (and store it in the port structures I > mentioned). Please determine which alternative is best. > Either ways is fine. We would have qcom->num_ports to determine how many speeds we can read.
>> */ >> #ifdef CONFIG_USB >> - udev = usb_hub_find_child(hcd->self.root_hub, 1); >> + udev = usb_hub_find_child(hcd->self.root_hub, port_index + 1); >> #else >> udev = NULL; >> #endif >> @@ -386,23 +385,29 @@ static void dwc3_qcom_disable_wakeup_irq(int irq) >> >> static void dwc3_qcom_disable_interrupts(struct dwc3_qcom *qcom) >> { >> + int i; >> + >> dwc3_qcom_disable_wakeup_irq(qcom->hs_phy_irq); >> >> - if (qcom->usb2_speed == USB_SPEED_LOW) { >> - dwc3_qcom_disable_wakeup_irq(qcom->phy_irq[DM_HS_PHY_IRQ_INDEX][0]); >> - } else if ((qcom->usb2_speed == USB_SPEED_HIGH) || >> - (qcom->usb2_speed == USB_SPEED_FULL)) { >> - dwc3_qcom_disable_wakeup_irq(qcom->phy_irq[DP_HS_PHY_IRQ_INDEX][0]); >> - } else { >> - dwc3_qcom_disable_wakeup_irq(qcom->phy_irq[DP_HS_PHY_IRQ_INDEX][0]); >> - dwc3_qcom_disable_wakeup_irq(qcom->phy_irq[DM_HS_PHY_IRQ_INDEX][0]); >> - } >> + for (i = 0; i < qcom->num_ports; i++) { >> + if (qcom->usb2_speed[i] == USB_SPEED_LOW) { >> + dwc3_qcom_disable_wakeup_irq(qcom->phy_irq[DM_HS_PHY_IRQ_INDEX][i]); >> + } else if ((qcom->usb2_speed[i] == USB_SPEED_HIGH) || >> + (qcom->usb2_speed[i] == USB_SPEED_FULL)) { >> + dwc3_qcom_disable_wakeup_irq(qcom->phy_irq[DP_HS_PHY_IRQ_INDEX][i]); >> + } else { >> + dwc3_qcom_disable_wakeup_irq(qcom->phy_irq[DP_HS_PHY_IRQ_INDEX][i]); >> + dwc3_qcom_disable_wakeup_irq(qcom->phy_irq[DM_HS_PHY_IRQ_INDEX][i]); >> + } >> >> - dwc3_qcom_disable_wakeup_irq(qcom->phy_irq[SS_PHY_IRQ_INDEX][0]); >> + dwc3_qcom_disable_wakeup_irq(qcom->phy_irq[SS_PHY_IRQ_INDEX][i]); >> + } >> } > > The above is hardly readable, partly because of the 2d array that I > think you should drop, and partly because you add the port loop here > instead of in the caller. > > A lot of these functions should become port operation where you either > pass in a port structure directly or possibly a port index as I've > mentioned before.
With your suggestion, yes, this can be refactored to be readable.
> > [ I realise that the confusion around hs_phy_irq may be partly to blame > for this but since that one is also a per-port interrupt, that's no > longer an issue. ]
I don't want to add support for this right away [1]. I would like to keep hs_phy_irq outside the loop for now.
> >> static int dwc3_qcom_suspend(struct dwc3_qcom *qcom, bool wakeup) >> @@ -454,10 +461,8 @@ static int dwc3_qcom_suspend(struct dwc3_qcom *qcom, bool wakeup) >> * The role is stable during suspend as role switching is done from a >> * freezable workqueue. >> */ >> - if (dwc3_qcom_is_host(qcom) && wakeup) { >> - qcom->usb2_speed = dwc3_qcom_read_usb2_speed(qcom); > > So just let this function update the usb2 speed for all ports unless > there are reasons not to.
Either way is fine by me as mentioned above. Will udapte code accordingly.
> >> + if (dwc3_qcom_is_host(qcom) && wakeup) >> dwc3_qcom_enable_interrupts(qcom); > > And then iterate over the ports and enable the interrupts here as you > did above for the pwr_evnt_irqs. > >> - } >> >> qcom->is_suspended = true; [1]: https://lore.kernel.org/all/fb5e5e1d-520c-4cbc-adde-f30e853421a1@quicinc.com/
Regards, Krishna,
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