Re: [PATCH v19 5/5] usb: dwc3: qcom: Keep power domain on to retain controller status

[Pavan Kondeti]

Hi Krishna,

On Thu, Jun 02, 2022 at 08:41:55AM +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 | 28 +++++++++++++++++++++-------
>  1 file changed, 21 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/usb/dwc3/dwc3-qcom.c b/drivers/usb/dwc3/dwc3-qcom.c
> index 56ecee0..2f5b5ae 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>
> @@ -756,12 +757,13 @@ 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)
> @@ -770,6 +772,8 @@ 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) {
> @@ -877,7 +881,17 @@ 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)) {
> +		/*
> +		 * Setting GENPD_FLAG_ALWAYS_ON flag takes care of keeping
> +		 * GEMPD on in both RT suspend and System suspend cases.
> +		 */

The comments provided at [1] are not addressed. Pls fix it.

https://lore.kernel.org/linux-usb/20220526024741.GP15121@xxxxxxxxxxxxxxxxxxxxxxxxxxxx/

Thanks,
Pavan