On Tue, May 24, 2022 at 03:43:48PM +0530, Krishna Kurapati wrote:
> From: Sandeep Maheswaram <quic_c_sanm@xxxxxxxxxxx>
>
> If dwc3 is wakeup capable, keep the power domain always ON so that
> wakeup from system suspend can be supported. Otherwise, keep the
> power domain ON only during runtime suspend to support wakeup from
> runtime suspend.
>
> Signed-off-by: Sandeep Maheswaram <quic_c_sanm@xxxxxxxxxxx>
> Signed-off-by: Krishna Kurapati <quic_kriskura@xxxxxxxxxxx>
> ---
> drivers/usb/dwc3/dwc3-qcom.c | 24 +++++++++++++++++-------
> 1 file changed, 17 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/usb/dwc3/dwc3-qcom.c b/drivers/usb/dwc3/dwc3-qcom.c
> index 5d5db62..7bffb31 100644
> --- a/drivers/usb/dwc3/dwc3-qcom.c
> +++ b/drivers/usb/dwc3/dwc3-qcom.c
> @@ -17,6 +17,7 @@
> #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>
> @@ -760,12 +761,13 @@ dwc3_qcom_create_urs_usb_platdev(struct device *dev)
>
> static int dwc3_qcom_probe(struct platform_device *pdev)
> {
> - struct device_node *np = pdev->dev.of_node;
> - struct device *dev = &pdev->dev;
> - struct dwc3_qcom *qcom;
> - struct resource *res, *parent_res = NULL;
> - int ret, i;
> - bool ignore_pipe_clk;
> + struct device_node *np = pdev->dev.of_node;
> + struct device *dev = &pdev->dev;
> + struct dwc3_qcom *qcom;
> + struct resource *res, *parent_res = NULL;
> + int ret, i;
> + bool ignore_pipe_clk;
> + struct generic_pm_domain *genpd;
>
> qcom = devm_kzalloc(&pdev->dev, sizeof(*qcom), GFP_KERNEL);
> if (!qcom)
> @@ -774,6 +776,8 @@ static int dwc3_qcom_probe(struct platform_device *pdev)
> platform_set_drvdata(pdev, qcom);
> qcom->dev = &pdev->dev;
>
> + genpd = pd_to_genpd(qcom->dev->pm_domain);
> +
> if (has_acpi_companion(dev)) {
> qcom->acpi_pdata = acpi_device_get_match_data(dev);
> if (!qcom->acpi_pdata) {
> @@ -881,7 +885,13 @@ static int dwc3_qcom_probe(struct platform_device *pdev)
> if (ret)
> goto interconnect_exit;
>
> - device_init_wakeup(&pdev->dev, 1);
> + if (device_can_wakeup(&qcom->dwc3->dev)) {
> + genpd->flags |= GENPD_FLAG_ALWAYS_ON;
> + device_init_wakeup(&pdev->dev, true);
> + } else {
> + genpd->flags |= GENPD_FLAG_RPM_ALWAYS_ON;
> + }
> +
Can you please write a comment here explaining why we do this?
commit description has some details already.
Thanks,
Pavan
