linux-kernel - Re: [PATCH 4/7] clk: qcom: gcc-sc7180: Fix up gcc_sdcc2_apps_clk

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Date:   Wed, 5 Jul 2023 15:41:06 +0200
From:   ungeskriptet <davidwronek@...il.com>
To:     Taniya Das <quic_tdas@...cinc.com>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-clk@...r.kernel.org, ~postmarketos/upstreaming@...ts.sr.ht,
        phone-devel@...r.kernel.org, map220v <map220v300@...il.com>
Subject: Re: [PATCH 4/7] clk: qcom: gcc-sc7180: Fix up gcc_sdcc2_apps_clk_src

On Wed, Jul 5, 2023 at 6:27 AM Taniya Das <quic_tdas@...cinc.com> wrote:
>
>
>
> On 7/4/2023 10:01 PM, David Wronek wrote:
> > From: map220v <map220v300@...il.com>
> >
> > Add the PARENT_ENABLE flag to prevent the clock from getting stuck at
> > boot.
> >
> > Fixes: 17269568f726 ("clk: qcom: Add Global Clock controller (GCC) driver for SC7180")
> > Signed-off-by: map220v <map220v300@...il.com>
> > Signed-off-by: David Wronek <davidwronek@...il.com>
> > ---
> >   drivers/clk/qcom/gcc-sc7180.c | 1 +
> >   1 file changed, 1 insertion(+)
> >
> > diff --git a/drivers/clk/qcom/gcc-sc7180.c b/drivers/clk/qcom/gcc-sc7180.c
> > index cef3c77564cf..49f36e1df4fa 100644
> > --- a/drivers/clk/qcom/gcc-sc7180.c
> > +++ b/drivers/clk/qcom/gcc-sc7180.c
> > @@ -651,6 +651,7 @@ static struct clk_rcg2 gcc_sdcc2_apps_clk_src = {
> >               .name = "gcc_sdcc2_apps_clk_src",
> >               .parent_data = gcc_parent_data_5,
> >               .num_parents = ARRAY_SIZE(gcc_parent_data_5),
> > +             .flags = CLK_OPS_PARENT_ENABLE,
>
> Could you please share what Stuck warnings are you observing?
>
> >               .ops = &clk_rcg2_floor_ops,
> >       },
> >   };
>
> --
> Thanks & Regards,
> Taniya Das.

Without this patch I get the following warning:
[    0.316057] gcc_sdcc2_apps_clk_src: rcg didn't update its configuration.
[    0.316081] WARNING: CPU: 4 PID: 75 at
drivers/clk/qcom/clk-rcg2.c:133 update_config+0xcc/0xdc
[    0.316226] Modules linked in:
[    0.316265] CPU: 4 PID: 75 Comm: kworker/u16:2 Not tainted
6.4.0-next-20230704-sm7125 #51
[    0.316337] Hardware name: Xiaomi Redmi Note 9 Pro (Global) (DT)
[    0.316394] Workqueue: events_unbound async_run_entry_fn
[    0.316453] pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
[    0.316517] pc : update_config+0xcc/0xdc
[    0.316560] lr : update_config+0xcc/0xdc
[    0.316602] sp : ffff80008088b8e0
[    0.316636] x29: ffff80008088b8e0 x28: 0000000000000000 x27: ffffa9c34c571d00
[    0.316708] x26: ffffa9c34c333db0 x25: ffff60d440b5ec10 x24: ffff80008088bb18
[    0.316778] x23: ffff60d441704900 x22: 0000000005f5e100 x21: ffffa9c34c5dc548
[    0.316849] x20: ffffa9c34cc739b8 x19: 0000000000000000 x18: fffffffffffe5f18
[    0.316918] x17: 0000000000000014 x16: 0000000000000020 x15: 0000000000000048
[    0.316988] x14: fffffffffffe5f60 x13: ffffa9c34cb5e928 x12: 00000000000003f9
[    0.317058] x11: 0000000000000153 x10: ffffa9c34cbb88f0 x9 : ffffa9c34cb5e928
[    0.317128] x8 : 00000000ffffefff x7 : ffffa9c34cbb6928 x6 : 0000000000000153
[    0.317197] x5 : 0000000000000000 x4 : 40000000fffff153 x3 : 0000000000000000
[    0.317266] x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff60d440284880
[    0.317336] Call trace:
[    0.317365]  update_config+0xcc/0xdc
[    0.317407]  clk_rcg2_configure+0xb0/0xb8
[    0.317451]  clk_rcg2_set_floor_rate_and_parent+0x2c/0x44
[    0.317506]  clk_change_rate+0x7c/0x294
[    0.317551]  clk_core_set_rate_nolock+0x168/0x274
[    0.317601]  clk_set_rate+0x38/0x14c
[    0.317641]  _opp_config_clk_single+0x30/0xa8
[    0.317687]  _set_opp+0x258/0x468
[    0.317726]  dev_pm_opp_set_rate+0x180/0x268
[    0.317770]  sdhci_msm_probe+0x360/0xb4c
[    0.317815]  platform_probe+0x68/0xc4
[    0.317859]  really_probe+0x148/0x2b0
[    0.317900]  __driver_probe_device+0x78/0x12c
[    0.317947]  driver_probe_device+0x3c/0x15c
[    0.317994]  __device_attach_driver+0xb8/0x134
[    0.318040]  bus_for_each_drv+0x84/0xe0
[    0.318082]  __device_attach_async_helper+0xac/0xd0
[    0.318132]  async_run_entry_fn+0x34/0xe0
[    0.318177]  process_one_work+0x1c0/0x334
[    0.318221]  worker_thread+0x68/0x428
[    0.318260]  kthread+0x110/0x114
[    0.318300]  ret_from_fork+0x10/0x20

Sincerely,
David