Re: [PATCH v3 3/5] usb: dwc3: qcom: Configure wakeup interrupts and set genpd active wakeup flag

Matthias Kaehlcke
2020-09-29T19:01:48Z

On Tue, Sep 29, 2020 at 04:17:30PM +0530, Sandeep Maheswaram wrote:
> Configure interrupts based on hs_phy_flag to avoid triggering of
> interrupts during system suspend and suspends successfully.
> Set genpd active wakeup flag for usb gdsc if wakeup capable devices
> are connected so that wake up happens without reenumeration.
>
> Signed-off-by: Sandeep Maheswaram <sanm@codeaurora.org>
> ---
> drivers/usb/dwc3/dwc3-qcom.c | 74 +++++++++++++++++++++++++++++++++++---------
> 1 file changed, 59 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/usb/dwc3/dwc3-qcom.c b/drivers/usb/dwc3/dwc3-qcom.c
> index c703d55..b6f36bd 100644
> --- a/drivers/usb/dwc3/dwc3-qcom.c
> +++ b/drivers/usb/dwc3/dwc3-qcom.c
> @@ -17,9 +17,11 @@
> #include <linux/of_platform.h>
> #include <linux/platform_device.h>
> #include <linux/phy/phy.h>
> +#include <linux/pm_domain.h>
> #include <linux/usb/of.h>
> #include <linux/reset.h>
> #include <linux/iopoll.h>
> +#include <linux/usb/hcd.h>
>
> #include "core.h"
>
> @@ -293,19 +295,33 @@ static void dwc3_qcom_interconnect_exit(struct dwc3_qcom *qcom)
>
> static void dwc3_qcom_disable_interrupts(struct dwc3_qcom *qcom)
> {
> + struct dwc3 *dwc = platform_get_drvdata(qcom->dwc3);
> +
> if (qcom->hs_phy_irq) {
> disable_irq_wake(qcom->hs_phy_irq);
> disable_irq_nosync(qcom->hs_phy_irq);
> }
>
> - if (qcom->dp_hs_phy_irq) {
> - disable_irq_wake(qcom->dp_hs_phy_irq);
> - disable_irq_nosync(qcom->dp_hs_phy_irq);
> - }
> + if (dwc->hs_phy_flags & PHY_MODE_USB_HOST_LS) {
> + if (qcom->dp_hs_phy_irq) {
> + disable_irq_wake(qcom->dp_hs_phy_irq);
> + disable_irq_nosync(qcom->dp_hs_phy_irq);
> + }
> + } else if (dwc->hs_phy_flags & PHY_MODE_USB_HOST_HS) {
> + if (qcom->dm_hs_phy_irq) {
> + disable_irq_wake(qcom->dm_hs_phy_irq);
> + disable_irq_nosync(qcom->dm_hs_phy_irq);
> + }
> + } else {
> + if (qcom->dp_hs_phy_irq) {
> + disable_irq_wake(qcom->dp_hs_phy_irq);
> + disable_irq_nosync(qcom->dp_hs_phy_irq);
> + }
>
> - if (qcom->dm_hs_phy_irq) {
> - disable_irq_wake(qcom->dm_hs_phy_irq);
> - disable_irq_nosync(qcom->dm_hs_phy_irq);
> + if (qcom->dm_hs_phy_irq) {
> + disable_irq_wake(qcom->dm_hs_phy_irq);
> + disable_irq_nosync(qcom->dm_hs_phy_irq);
> + }

This function would benefit from a helper like this:

static void dwc3_qcon_enable_wakeup_irq(int wake_irq)
{
if (wake_irq) {
disable_irq_wake(wake_irq);
disable_irq_nosync(wake_irq);
}
}

> }
>
> if (qcom->ss_phy_irq) {
> @@ -316,19 +332,33 @@ static void dwc3_qcom_disable_interrupts(struct dwc3_qcom *qcom)
>
> static void dwc3_qcom_enable_interrupts(struct dwc3_qcom *qcom)
> {
> + struct dwc3 *dwc = platform_get_drvdata(qcom->dwc3);
> +
> if (qcom->hs_phy_irq) {
> enable_irq(qcom->hs_phy_irq);
> enable_irq_wake(qcom->hs_phy_irq);
> }
>
> - if (qcom->dp_hs_phy_irq) {
> - enable_irq(qcom->dp_hs_phy_irq);
> - enable_irq_wake(qcom->dp_hs_phy_irq);
> - }
> + if (dwc->hs_phy_flags & PHY_MODE_USB_HOST_LS) {
> + if (qcom->dp_hs_phy_irq) {
> + enable_irq(qcom->dp_hs_phy_irq);
> + enable_irq_wake(qcom->dp_hs_phy_irq);
> + }
> + } else if (dwc->hs_phy_flags & PHY_MODE_USB_HOST_HS) {
> + if (qcom->dm_hs_phy_irq) {
> + enable_irq(qcom->dm_hs_phy_irq);
> + enable_irq_wake(qcom->dm_hs_phy_irq);
> + }
> + } else {
> + if (qcom->dp_hs_phy_irq) {
> + enable_irq(qcom->dp_hs_phy_irq);
> + enable_irq_wake(qcom->dp_hs_phy_irq);
> + }
>
> - if (qcom->dm_hs_phy_irq) {
> - enable_irq(qcom->dm_hs_phy_irq);
> - enable_irq_wake(qcom->dm_hs_phy_irq);
> + if (qcom->dm_hs_phy_irq) {
> + enable_irq(qcom->dm_hs_phy_irq);
> + enable_irq_wake(qcom->dm_hs_phy_irq);
> + }
> }

Same as for _disable(), a helper would make this function more
digestable.

> if (qcom->ss_phy_irq) {
> @@ -341,6 +371,15 @@ static int dwc3_qcom_suspend(struct dwc3_qcom *qcom)
> {
> u32 val;
> int i, ret;
> + struct dwc3 *dwc = platform_get_drvdata(qcom->dwc3);
> + struct usb_hcd *hcd;

nit: remove extra blank

> + struct generic_pm_domain *genpd = pd_to_genpd(qcom->dev->pm_domain);
> +
> + if (dwc->xhci) {
> + hcd = platform_get_drvdata(dwc->xhci);
> + if (usb_wakeup_enabled_descendants(hcd->self.root_hub))
> + genpd->flags |= GENPD_FLAG_ACTIVE_WAKEUP;
> + }

Do this after the check for 'qcom->is_suspended' below

>
> if (qcom->is_suspended)
> return 0;
> @@ -366,6 +405,11 @@ static int dwc3_qcom_resume(struct dwc3_qcom *qcom)
> {
> int ret;
> int i;
> + struct dwc3 *dwc = platform_get_drvdata(qcom->dwc3);
> + struct generic_pm_domain *genpd = pd_to_genpd(qcom->dev->pm_domain);
> +
> + if (dwc->xhci)
> + genpd->flags &= ~GENPD_FLAG_ACTIVE_WAKEUP;

ditto

>
> if (!qcom->is_suspended)
> return 0;
> @@ -764,7 +808,7 @@ static int dwc3_qcom_probe(struct platform_device *pdev)
> if (ret)
> goto interconnect_exit;
>
> - device_init_wakeup(&pdev->dev, 1);
> + device_init_wakeup(&pdev->dev, of_property_read_bool(np, "wakeup-source"));
> qcom->is_suspended = false;
> pm_runtime_set_active(dev);
> pm_runtime_enable(dev);
>