linux-kernel - Re: [PATCH] clk: qcom: gcc-sm8150: Fix gcc_sdcc2_apps_clk

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Date:   Fri, 15 Sep 2023 14:04:41 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Stephen Boyd <sboyd@...nel.org>,
        Danila Tikhonov <danila@...xyga.com>, agross@...nel.org,
        andersson@...nel.org, dkatraga@...eaurora.org,
        mturquette@...libre.com, quic_tdas@...cinc.com, vkoul@...nel.org
Cc:     adomerlee@...il.com, linux-arm-msm@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] clk: qcom: gcc-sm8150: Fix gcc_sdcc2_apps_clk_src

On 14.09.2023 18:20, Stephen Boyd wrote:
> Quoting Danila Tikhonov (2023-09-13 10:56:11)
>> Set .flags = CLK_OPS_PARENT_ENABLE to fix "gcc_sdcc2_apps_clk_src: rcg
>> didn't update its configuration" error.
>>
>> Fixes: 2a1d7eb854bb ("clk: qcom: gcc: Add global clock controller driver for SM8150")
>> Tested-by: Arseniy Velikanov <adomerlee@...il.com>
>> Signed-off-by: Danila Tikhonov <danila@...xyga.com>
>> ---
>>  drivers/clk/qcom/gcc-sm8150.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/clk/qcom/gcc-sm8150.c b/drivers/clk/qcom/gcc-sm8150.c
>> index 41ab210875fb..05d115c52dfe 100644
>> --- a/drivers/clk/qcom/gcc-sm8150.c
>> +++ b/drivers/clk/qcom/gcc-sm8150.c
>> @@ -774,7 +774,7 @@ static struct clk_rcg2 gcc_sdcc2_apps_clk_src = {
>>                 .name = "gcc_sdcc2_apps_clk_src",
>>                 .parent_data = gcc_parents_6,
>>                 .num_parents = ARRAY_SIZE(gcc_parents_6),
>> -               .flags = CLK_SET_RATE_PARENT,
>> +               .flags = CLK_OPS_PARENT_ENABLE,
>>                 .ops = &clk_rcg2_floor_ops,
> 
> In what case are we getting the rcg stuck? I thought that you could
> write the rcg registers while the parent was off and switch to that
> parent if the parent isn't enabled and it wouldn't get stuck.
I think the better question here would be "why isn't
OPS_PARENT_ENABLE the default for all qc clocks on all
platforms" :/

Konrad