linux-kernel - Re: [PATCH 2/3] clk: qcom: ipq6018: add USB GDSCs

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Date:   Mon, 13 Nov 2023 13:50:48 +0100
From:   Robert Marko <robimarko@...il.com>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>
Cc:     agross@...nel.org, andersson@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        mturquette@...libre.com, sboyd@...nel.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
        Kathiravan Thirumoorthy <quic_kathirav@...cinc.com>
Subject: Re: [PATCH 2/3] clk: qcom: ipq6018: add USB GDSCs

On Mon, 13 Nov 2023 at 12:58, Konrad Dybcio <konrad.dybcio@...aro.org> wrote:
>
> On 11.11.2023 12:28, Robert Marko wrote:
> > On Tue, 7 Nov 2023 at 22:51, Konrad Dybcio <konrad.dybcio@...aro.org> wrote:
> >>
> >>
> >>
> >> On 10/31/23 10:01, Robert Marko wrote:
> >>> On Mon, 30 Oct 2023 at 22:12, Konrad Dybcio <konrad.dybcio@...aro.org> wrote:
> >>>>
> >>>> On 30.10.2023 21:37, Robert Marko wrote:
> >>>>> On Mon, 30 Oct 2023 at 20:37, Konrad Dybcio <konrad.dybcio@...aro.org> wrote:
> >>>>>>
> >>>>>> On 29.10.2023 12:04, Robert Marko wrote:
> >>>>>>> On Wed, 25 Oct 2023 at 12:45, Robert Marko <robimarko@...il.com> wrote:
> >>>>>>>>
> >>>>>>>> IPQ6018 has GDSC-s for each of the USB ports, so lets define them as such
> >>>>>>>> and drop the curent code that is de-asserting the USB GDSC-s as part of
> >>>>>>>> the GCC probe.
> >>>>>>>>
> >>>>>>>> Signed-off-by: Robert Marko <robimarko@...il.com>
> >>>>>>>
> >>>>>>> Unfortunately, after testing on multiple devices I hit the same GDSC
> >>>>>>> issue I had a long time ago
> >>>>>>> that was the reason I did not send this upstream.
> >>>>>>> It seems that USB3 port GDSC (USB0 GDSC in code) works just fine,
> >>>>>>> however the USB2 one
> >>>>>>> (USB1 GDSC in code) it is stuck off and USB2 port will fail due to this:
> >>>>>>>      1.607531] ------------[ cut here ]------------
> >>>>>>> [    1.607559] usb1_gdsc status stuck at 'off'
> >>>>>>> [    1.607592] WARNING: CPU: 0 PID: 35 at gdsc_toggle_logic+0x16c/0x174
> >>>>>>> [    1.615120] Modules linked in:
> >>>>>> Can you dump GDSCR (the entire 32-bit register) at boot and when toggling?
> >>>>>
> >>>>> Sure, here it is:
> >>>>> [    0.023760] qcom,gcc-ipq6018 1800000.gcc: reg: 0x3e078 val: 0x8222004 init
> >>>>> [    0.023782] qcom,gcc-ipq6018 1800000.gcc: reg: 0x3f078 val: 0x8222004 init
> >>>>> [    0.988626] qcom,gcc-ipq6018 1800000.gcc: reg: 0x3f078 val:
> >>>>> 0x8282000 before toggle
> >>>>> [    1.202506] qcom,gcc-ipq6018 1800000.gcc: reg: 0x3f078 val:
> >>>>> 0x8282000 after toggle
> >>>>> [    1.207208] qcom,gcc-ipq6018 1800000.gcc: reg: 0x3e078 val:
> >>>>> 0xa0282000 before toggle
> >>>> Any chance
> >>>>
> >>>> .en_few_wait_val = 0x2
> >>>>
> >>>> (turning BIT(19) into BIT(17))
> >>>>
> >>>> will make a difference?
> >>>
> >>> Sadly, it makes no difference and GDSC status bit newer comes up which is
> >>> rather weird as USB0 one seems to work just fine.
> >> What if you add clk_ignore_unused?
> >
> > To the USB1 master clock or?
> That's a command line parameter, effectively setting it on all clks.

Oh that, I understand now.

>
> >
> > There is definitively something broken regarding the GDSC as
> > GDSC_STATE bits (30-27)
> > change from 0 to something on the USB0 GDSC but on GDSC1 they are 0 even after
> > SW_OVERRIDE BIT(2) is set to 1, and the POWER BIT(31) newer changes to 1.
> >
> > However, if you manually set BIT(2) to 1 then the USB1 master clock
> > can come up so
> > GDSC seems to work.
> > USB1 (The USB2.0 HS) port is still broken after this if USB mass storage is used
> > but that was present before the GDSC changes as well and I still need
> > to figure out
> > which quirk is missing for this.
> Please try clk_ignore_unused and see if toggling the GDSC is still broken.

Sadly, passing clk_ignore_unused in the bootargs doesn't help, GDSC is
still stuck off.

Regards,
Robert

>
> Konrad