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

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Date:   Thu, 14 Sep 2023 09:20:50 -0700
From:   Stephen Boyd <sboyd@...nel.org>
To:     Danila Tikhonov <danila@...xyga.com>, agross@...nel.org,
        andersson@...nel.org, dkatraga@...eaurora.org,
        konrad.dybcio@...aro.org, mturquette@...libre.com,
        quic_tdas@...cinc.com, vkoul@...nel.org
Cc:     danila@...xyga.com, 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

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.