linux-kernel - Re: [PATCH v2, 2/3] usb: dwc3: core: add p3p2tranok quirk

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Date: Fri, 7 Jun 2024 22:24:15 +0800
From: joswang <joswang1221@...il.com>
To: Thinh Nguyen <Thinh.Nguyen@...opsys.com>
Cc: "robh@...nel.org" <robh@...nel.org>, "krzk+dt@...nel.org" <krzk+dt@...nel.org>, 
	"conor+dt@...nel.org" <conor+dt@...nel.org>, 
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>, 
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>, 
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "balbi@...nel.org" <balbi@...nel.org>, 
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>, joswang <joswang@...ovo.com>
Subject: Re: [PATCH v2, 2/3] usb: dwc3: core: add p3p2tranok quirk

On Tue, Jun 4, 2024 at 8:02 AM Thinh Nguyen <Thinh.Nguyen@...opsys.com> wrote:
>
> On Mon, Jun 03, 2024, joswang wrote:
> > From: joswang <joswang@...ovo.com>
> >
> > In the case of enable hibernation, there is an issue with
>
> I assume this is for host mode since we currently don't handle
> hibernation in device mode (please confirm).
>
> > the DWC31 2.00a and earlier versions where the controller
> > link power state transition from P3/P3CPM/P4 to P2 may take
> > longer than expected, ultimately resulting in the hibernation
> > D3 entering time exceeding the expected 10ms.
>
> Can you provide more context where the 10ms requirement is from?
>
> >
> > Synopsys workaround:
> > If the PHY supports direct P3 to P2 transition, program
> > GUSB3PIPECTL.P3P2Tran0K=1.
> >
>
> Which STAR issue is this?
>
> > Therefore, adding p3p2tranok quirk for workaround hibernation
> > D3 exceeded the expected entry time.
> >
> > Signed-off-by: joswang <joswang@...ovo.com>
> > ---
>
> Please provide change note for v1->v2 here (and the rest of the other
> patches).
>
> >  drivers/usb/dwc3/core.c | 5 +++++
> >  drivers/usb/dwc3/core.h | 4 ++++
> >  2 files changed, 9 insertions(+)
> >
> > diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
> > index 7ee61a89520b..3a8fbc2d6b99 100644
> > --- a/drivers/usb/dwc3/core.c
> > +++ b/drivers/usb/dwc3/core.c
> > @@ -666,6 +666,9 @@ static int dwc3_ss_phy_setup(struct dwc3 *dwc, int index)
> >       if (dwc->dis_del_phy_power_chg_quirk)
> >               reg &= ~DWC3_GUSB3PIPECTL_DEPOCHANGE;
> >
> > +     if (dwc->p2p3tranok_quirk)
> > +             reg |= DWC3_GUSB3PIPECTL_P3P2TRANOK;
> > +
> >       dwc3_writel(dwc->regs, DWC3_GUSB3PIPECTL(index), reg);
> >
> >       return 0;
> > @@ -1715,6 +1718,8 @@ static void dwc3_get_properties(struct dwc3 *dwc)
> >
> >       dwc->dis_split_quirk = device_property_read_bool(dev,
> >                               "snps,dis-split-quirk");
> > +     dwc->p2p3tranok_quirk = device_property_read_bool(dev,
> > +                             "snps,p2p3tranok-quirk");
> >
> >       dwc->lpm_nyet_threshold = lpm_nyet_threshold;
> >       dwc->tx_de_emphasis = tx_de_emphasis;
> > diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
> > index 3781c736c1a1..2810dce8b42e 100644
> > --- a/drivers/usb/dwc3/core.h
> > +++ b/drivers/usb/dwc3/core.h
> > @@ -327,6 +327,7 @@
> >  #define DWC3_GUSB3PIPECTL_DEP1P2P3_EN        DWC3_GUSB3PIPECTL_DEP1P2P3(1)
> >  #define DWC3_GUSB3PIPECTL_DEPOCHANGE BIT(18)
> >  #define DWC3_GUSB3PIPECTL_SUSPHY     BIT(17)
> > +#define DWC3_GUSB3PIPECTL_P3P2TRANOK BIT(11)
> >  #define DWC3_GUSB3PIPECTL_LFPSFILT   BIT(9)
> >  #define DWC3_GUSB3PIPECTL_RX_DETOPOLL        BIT(8)
> >  #define DWC3_GUSB3PIPECTL_TX_DEEPH_MASK      DWC3_GUSB3PIPECTL_TX_DEEPH(3)
> > @@ -1132,6 +1133,8 @@ struct dwc3_scratchpad_array {
> >   *                   instances in park mode.
> >   * @parkmode_disable_hs_quirk: set if we need to disable all HishSpeed
> >   *                   instances in park mode.
> > + * @p2p3tranok_quirk: set if Controller transitions directly from phy
> > + *                   power state P2 to P3 or from state P3 to P2.
> >   * @gfladj_refclk_lpm_sel: set if we need to enable SOF/ITP counter
> >   *                          running based on ref_clk
> >   * @tx_de_emphasis_quirk: set if we enable Tx de-emphasis quirk
> > @@ -1361,6 +1364,7 @@ struct dwc3 {
> >       unsigned                ulpi_ext_vbus_drv:1;
> >       unsigned                parkmode_disable_ss_quirk:1;
> >       unsigned                parkmode_disable_hs_quirk:1;
> > +     unsigned                p2p3tranok_quirk:1;
> >       unsigned                gfladj_refclk_lpm_sel:1;
> >
> >       unsigned                tx_de_emphasis_quirk:1;
> > --
> > 2.17.1
> >
>
> Thanks,
> Thinh

Difference between V2 and V1: This patch has no changes, only the
"dt-bindings: usb: dwc3: Add snps,p2p3tranok quirk" patch is added.

Thanks
Jos Wang