linux-kernel - Re: [PATCH v3 3/5] clk: qcom: ipq5332: Register gcc_qdss_tsctr_clk

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Message-ID: <Zp4iNQcBN0eH2QeA@hu-varada-blr.qualcomm.com>
Date: Mon, 22 Jul 2024 14:41:17 +0530
From: Varadarajan Narayanan <quic_varada@...cinc.com>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
CC: <andersson@...nel.org>, <mturquette@...libre.com>, <sboyd@...nel.org>,
        <robh@...nel.org>, <krzk+dt@...nel.org>, <conor+dt@...nel.org>,
        <gregkh@...uxfoundation.org>, <konrad.dybcio@...aro.org>,
        <djakov@...nel.org>, <quic_wcheng@...cinc.com>,
        <linux-arm-msm@...r.kernel.org>, <linux-clk@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-usb@...r.kernel.org>, <linux-pm@...r.kernel.org>
Subject: Re: [PATCH v3 3/5] clk: qcom: ipq5332: Register
 gcc_qdss_tsctr_clk_src

On Mon, Jul 22, 2024 at 11:24:33AM +0300, Dmitry Baryshkov wrote:
> On Mon, Jul 22, 2024 at 11:25:37AM GMT, Varadarajan Narayanan wrote:
> > gcc_qdss_tsctr_clk_src (enabled in the boot loaders and dependent
> > on gpll4_main) was not registered as one of the ipq5332 clocks.
> > Hence clk_disable_unused() disabled 'gpll4_main' assuming there
> > were no consumers for 'gpll4_main' resulting in system freeze or
> > reboots.
> >
> > After registering gcc_qdss_tsctr_clk_src, CLK_IGNORE_UNUSED can
> > be removed from gpll4_main.
>
> Commented below.
>
> >
> > Signed-off-by: Varadarajan Narayanan <quic_varada@...cinc.com>
>
> Fixes?

Will add that. Was hesitant to add as it would point to the approx
3800 line commit (3d89d52970fd) that introduced the gcc-ipq5332.c file.

> > ---
> >  drivers/clk/qcom/gcc-ipq5332.c | 12 +-----------
> >  1 file changed, 1 insertion(+), 11 deletions(-)
> >
> > diff --git a/drivers/clk/qcom/gcc-ipq5332.c b/drivers/clk/qcom/gcc-ipq5332.c
> > index f98591148a97..237b6a766179 100644
> > --- a/drivers/clk/qcom/gcc-ipq5332.c
> > +++ b/drivers/clk/qcom/gcc-ipq5332.c
> > @@ -126,17 +126,6 @@ static struct clk_alpha_pll gpll4_main = {
> >  			.parent_data = &gcc_parent_data_xo,
> >  			.num_parents = 1,
> >  			.ops = &clk_alpha_pll_stromer_ops,
> > -			/*
> > -			 * There are no consumers for this GPLL in kernel yet,
> > -			 * (will be added soon), so the clock framework
> > -			 * disables this source. But some of the clocks
> > -			 * initialized by boot loaders uses this source. So we
> > -			 * need to keep this clock ON. Add the
> > -			 * CLK_IGNORE_UNUSED flag so the clock will not be
> > -			 * disabled. Once the consumer in kernel is added, we
> > -			 * can get rid of this flag.
> > -			 */
> > -			.flags = CLK_IGNORE_UNUSED,
>
> You can't drop it in this patch, since GPLL4 still can get disabled if
> GCC_QDSS_TSCTR_CLK_SRC gets disabled. This chunk should go to the next
> patch (or you should reorder the patches).

Ok, will move the above chunk to next patch.

Thanks
Varada

> >  		},
> >  	},
> >  };
> > @@ -3388,6 +3377,7 @@ static struct clk_regmap *gcc_ipq5332_clocks[] = {
> >  	[GCC_QDSS_DAP_DIV_CLK_SRC] = &gcc_qdss_dap_div_clk_src.clkr,
> >  	[GCC_QDSS_ETR_USB_CLK] = &gcc_qdss_etr_usb_clk.clkr,
> >  	[GCC_QDSS_EUD_AT_CLK] = &gcc_qdss_eud_at_clk.clkr,
> > +	[GCC_QDSS_TSCTR_CLK_SRC] = &gcc_qdss_tsctr_clk_src.clkr,
> >  	[GCC_QPIC_AHB_CLK] = &gcc_qpic_ahb_clk.clkr,
> >  	[GCC_QPIC_CLK] = &gcc_qpic_clk.clkr,
> >  	[GCC_QPIC_IO_MACRO_CLK] = &gcc_qpic_io_macro_clk.clkr,
> > --
> > 2.34.1
> >
>
> --
> With best wishes
> Dmitry