Re: [PATCH 2/8] Revert "usb: dwc3: qcom: Keep power domain on to retain controller status"

[Johan Hovold <johan@kernel.org>]

On Tue, Aug 02, 2022 at 11:30:34PM +0530, Krishna Kurapati PSSNV wrote:
> 
> On 8/2/2022 8:43 PM, Johan Hovold wrote:
> > This reverts commit d9be8d5c5b032e5383ff5c404ff4155e9c705429.
> >
> > Generic power-domain flags must be set before the power-domain is
> > initialised and must specifically not be modified by drivers for devices
> > that happen to be in the domain.
> >
> > To make sure that USB power-domains are left enabled during system
> > suspend when a device in the domain is in the wakeup path, the
> > GENPD_FLAG_ACTIVE_WAKEUP flag should instead be set for the domain
> > unconditionally when it is registered.

> In case we need the genpd framework to set the GENPD_FLAG_ACTIVE_WAKEUP
> flag for a particular domain that will be used by a device (which is
> wakeup capable) and hasn't been probed yet , can you help me understand if
> there any dt-flags we  can add to convey the same the genpd  framework
> so that it will set that flag during domain registration ?

This can't be expressed in DT (currently), so what you need is something
like the below:

diff --git a/drivers/clk/qcom/gcc-sc7280.c b/drivers/clk/qcom/gcc-sc7280.c
index 7ff64d4d5920..4ff855269467 100644
--- a/drivers/clk/qcom/gcc-sc7280.c
+++ b/drivers/clk/qcom/gcc-sc7280.c
@@ -3125,6 +3125,7 @@ static struct gdsc gcc_usb30_prim_gdsc = {
        .gdscr = 0xf004,
        .pd = {
                .name = "gcc_usb30_prim_gdsc",
+               .flags = GENPD_FLAG_ACTIVE_WAKEUP,
        },
        .pwrsts = PWRSTS_OFF_ON,
        .flags = VOTABLE,
@@ -3134,6 +3135,7 @@ static struct gdsc gcc_usb30_sec_gdsc = {
        .gdscr = 0x9e004,
        .pd = {
                .name = "gcc_usb30_sec_gdsc",
+               .flags = GENPD_FLAG_ACTIVE_WAKEUP,
        },
        .pwrsts = PWRSTS_OFF_ON,
        .flags = VOTABLE,

to make sure that genpd keeps these domains powered during system
suspend if they are used by devices that are in the wakeup path.

Johan