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Date: Thu, 10 Dec 2020 16:47:49 -0800
From: Matthias Kaehlcke <mka@...omium.org>
To: Sandeep Maheswaram <sanm@...eaurora.org>
Cc: Andy Gross <agross@...nel.org>,
Bjorn Andersson <bjorn.andersson@...aro.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Felipe Balbi <balbi@...nel.org>,
Stephen Boyd <swboyd@...omium.org>,
Doug Anderson <dianders@...omium.org>,
linux-arm-msm@...r.kernel.org, linux-usb@...r.kernel.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
Manu Gautam <mgautam@...eaurora.org>
Subject: Re: [PATCH v4 3/5] usb: dwc3: qcom: Configure wakeup interrupts and
set genpd active wakeup flag
On Wed, Oct 28, 2020 at 02:08:01AM +0530, Sandeep Maheswaram wrote:
> Configure interrupts based on hs_phy_mode 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.
> Add helper functions to enable,disable wake irqs.
>
> Signed-off-by: Sandeep Maheswaram <sanm@...eaurora.org>
> ---
> drivers/usb/dwc3/dwc3-qcom.c | 82 ++++++++++++++++++++++++++++----------------
> 1 file changed, 52 insertions(+), 30 deletions(-)
>
> diff --git a/drivers/usb/dwc3/dwc3-qcom.c b/drivers/usb/dwc3/dwc3-qcom.c
> index c703d55..c93f7bb 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"
>
> @@ -291,60 +293,75 @@ static void dwc3_qcom_interconnect_exit(struct dwc3_qcom *qcom)
> icc_put(qcom->icc_path_apps);
> }
>
> -static void dwc3_qcom_disable_interrupts(struct dwc3_qcom *qcom)
> +static void dwc3_qcom_enable_wakeup_irq(int wake_irq)
super-nit: from the name of the function it's evident that this is a
wakeup irq, you could omit the 'wake_' prefix.
> {
> - if (qcom->hs_phy_irq) {
> - disable_irq_wake(qcom->hs_phy_irq);
> - disable_irq_nosync(qcom->hs_phy_irq);
> + if (wake_irq) {
> + enable_irq(wake_irq);
> + enable_irq_wake(wake_irq);
> }
nit: the following would be a more common structure:
if (!wake_irq)
return;
enable_irq(wake_irq);
enable_irq_wake(wake_irq);
> +}
>
> - if (qcom->dp_hs_phy_irq) {
> - disable_irq_wake(qcom->dp_hs_phy_irq);
> - disable_irq_nosync(qcom->dp_hs_phy_irq);
> +static void dwc3_qcom_disable_wakeup_irq(int wake_irq)
same as above
> +{
> + if (wake_irq) {
> + disable_irq_wake(wake_irq);
> + disable_irq_nosync(wake_irq);
> }
same as above
> +}
>
> - if (qcom->dm_hs_phy_irq) {
> - disable_irq_wake(qcom->dm_hs_phy_irq);
> - disable_irq_nosync(qcom->dm_hs_phy_irq);
> - }
> +static void dwc3_qcom_disable_interrupts(struct dwc3_qcom *qcom)
> +{
> + struct dwc3 *dwc = platform_get_drvdata(qcom->dwc3);
> +
> + dwc3_qcom_disable_wakeup_irq(qcom->hs_phy_irq);
>
> - if (qcom->ss_phy_irq) {
> - disable_irq_wake(qcom->ss_phy_irq);
> - disable_irq_nosync(qcom->ss_phy_irq);
> + if (dwc->hs_phy_mode & PHY_MODE_USB_HOST_LS)
> + dwc3_qcom_disable_wakeup_irq(qcom->dp_hs_phy_irq);
> + else if (dwc->hs_phy_mode & PHY_MODE_USB_HOST_HS)
> + dwc3_qcom_disable_wakeup_irq(qcom->dm_hs_phy_irq);
> + else {
> + dwc3_qcom_disable_wakeup_irq(qcom->dp_hs_phy_irq);
> + dwc3_qcom_disable_wakeup_irq(qcom->dm_hs_phy_irq);
> }
The following would be clearer IMO:
if (dwc->hs_phy_mode & (PHY_MODE_USB_HOST_LS | PHY_MODE_USB_HOST_SS))
dwc3_qcom_disable_wakeup_irq(qcom->dp_hs_phy_irq);
if (dwc->hs_phy_mode & (PHY_MODE_USB_HOST_HS | PHY_MODE_USB_HOST_SS))
dwc3_qcom_disable_wakeup_irq(qcom->dm_hs_phy_irq);
> +
> + dwc3_qcom_disable_wakeup_irq(qcom->ss_phy_irq);
Why isn't this conditional on 'dwc->hs_phy_mode & PHY_MODE_USB_HOST_SS'?
> }
>
> static void dwc3_qcom_enable_interrupts(struct dwc3_qcom *qcom)
> {
> - if (qcom->hs_phy_irq) {
> - enable_irq(qcom->hs_phy_irq);
> - enable_irq_wake(qcom->hs_phy_irq);
> - }
> + struct dwc3 *dwc = platform_get_drvdata(qcom->dwc3);
>
> - if (qcom->dp_hs_phy_irq) {
> - enable_irq(qcom->dp_hs_phy_irq);
> - enable_irq_wake(qcom->dp_hs_phy_irq);
> - }
> + dwc3_qcom_enable_wakeup_irq(qcom->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 (dwc->hs_phy_mode & PHY_MODE_USB_HOST_LS)
> + dwc3_qcom_enable_wakeup_irq(qcom->dp_hs_phy_irq);
> + else if (dwc->hs_phy_mode & PHY_MODE_USB_HOST_HS)
> + dwc3_qcom_enable_wakeup_irq(qcom->dm_hs_phy_irq);
> + else {
> + dwc3_qcom_enable_wakeup_irq(qcom->dp_hs_phy_irq);
> + dwc3_qcom_enable_wakeup_irq(qcom->dm_hs_phy_irq);
> }
>
> - if (qcom->ss_phy_irq) {
> - enable_irq(qcom->ss_phy_irq);
> - enable_irq_wake(qcom->ss_phy_irq);
> - }
> + dwc3_qcom_enable_wakeup_irq(qcom->ss_phy_irq);
same comments as for dwc3_qcom_disable_interrupts()
> }
>
> 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 one blank
> + struct generic_pm_domain *genpd = pd_to_genpd(qcom->dev->pm_domain);
>
> if (qcom->is_suspended)
> return 0;
>
> + if (dwc->xhci) {
> + hcd = platform_get_drvdata(dwc->xhci);
> + if (usb_wakeup_enabled_descendants(hcd->self.root_hub))
> + genpd->flags |= GENPD_FLAG_ACTIVE_WAKEUP;
Shouldn't this only be done when wakeup is enabled?
> + }
> +
> val = readl(qcom->qscratch_base + PWR_EVNT_IRQ_STAT_REG);
> if (!(val & PWR_EVNT_LPM_IN_L2_MASK))
> dev_err(qcom->dev, "HS-PHY not in L2\n");
> @@ -366,10 +383,15 @@ 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 (!qcom->is_suspended)
> return 0;
>
> + if (dwc->xhci)
> + genpd->flags &= ~GENPD_FLAG_ACTIVE_WAKEUP;
Could also depend on wakeup being enabled, but less important.
> +
> dwc3_qcom_disable_interrupts(qcom);
>
> for (i = 0; i < qcom->num_clocks; i++) {
> @@ -764,7 +786,7 @@ 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);
> --
> QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
> of Code Aurora Forum, hosted by The Linux Foundation
>
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