linux-kernel - Re: [PATCH] clk: qcom: mmcc-msm8974: Fix mmss_s0

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Message-ID: <161048146613.3661239.17638637385414531449@swboyd.mtv.corp.google.com>
Date:   Tue, 12 Jan 2021 11:57:46 -0800
From:   Stephen Boyd <sboyd@...nel.org>
To:     Konrad Dybcio <konrad.dybcio@...ainline.org>,
        phone-devel@...r.kernel.org
Cc:     ~postmarketos/upstreaming@...ts.sr.ht,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Michael Turquette <mturquette@...libre.com>,
        Mike Turquette <mturquette@...aro.org>,
        linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] clk: qcom: mmcc-msm8974: Fix mmss_s0_axi clock

Quoting Konrad Dybcio (2020-12-26 06:09:34)
> On boards without cont_splash the clock wouldn't get enabled.
> Reparent it and strongly depend on the parent to make sure
> it's accessible. Access to MMSS depends on mmss_s0_axi being

It's not a dependency. The parent is supposed to be the actual parent
clk that is directly upstream of the clk. I understand that some
dependency isn't enabled but maybe that just means we need to write some
enable bit when this driver probes instead?

> up and alive.
> 
> Fixes: d8b212014e69 ("clk: qcom: Add support for MSM8974's multimedia clock controller (MMCC)")
> Signed-off-by: Konrad Dybcio <konrad.dybcio@...ainline.org>
> ---
>  drivers/clk/qcom/mmcc-msm8974.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/clk/qcom/mmcc-msm8974.c b/drivers/clk/qcom/mmcc-msm8974.c
> index 015426262d08..6220b62ece1e 100644
> --- a/drivers/clk/qcom/mmcc-msm8974.c
> +++ b/drivers/clk/qcom/mmcc-msm8974.c
> @@ -2101,11 +2101,11 @@ static struct clk_branch mmss_s0_axi_clk = {
>                 .hw.init = &(struct clk_init_data){
>                         .name = "mmss_s0_axi_clk",
>                         .parent_names = (const char *[]){
> -                               "mmss_axi_clk_src",
> +                               "mmss_mmssnoc_axi_clk",
>                         },
>                         .num_parents = 1,
>                         .ops = &clk_branch2_ops,
> -                       .flags = CLK_IGNORE_UNUSED,
> +                       .flags = CLK_IGNORE_UNUSED | CLK_SET_RATE_PARENT | CLK_OPS_PARENT_ENABLE,
>                 },
>         },