linux-kernel - Re: [PATCH 2/6] clk: qcom: apss-ipq6018: fix apcs_alias0_clk

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Message-ID: <CAA8EJprfAW7kFSPxs7=LEHLmAVrWhV8KRbUseg8jXyiUbyZuRQ@mail.gmail.com>
Date:   Mon, 11 Jul 2022 15:48:12 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Robert Marko <robimarko@...il.com>
Cc:     bjorn.andersson@...aro.org, agross@...nel.org,
        konrad.dybcio@...ainline.org, mturquette@...libre.com,
        sboyd@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, sivaprak@...eaurora.org,
        linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/6] clk: qcom: apss-ipq6018: fix apcs_alias0_clk_src

On Mon, 11 Jul 2022 at 14:22, Robert Marko <robimarko@...il.com> wrote:
>
> While working on IPQ8074 APSS driver it was discovered that IPQ6018 and
> IPQ8074 use almost the same PLL and APSS clocks, however APSS driver is
> currently broken.
>
> More precisely apcs_alias0_clk_src is broken, it was added as regmap_mux
> clock.
> However after debugging why it was always stuck at 800Mhz, it was figured
> out that its not regmap_mux compatible at all.
> It is a simple mux but it uses RCG2 register layout and control bits, so

To utilize control bits, you probably should also use

> utilize the new clk_rcg2_mux_closest_ops to correctly drive it while not
> having to provide a dummy frequency table.

Could you please clarify this. Your new rcg2 ops seems to be literally
equivalent to the clk_regmap_mux_closest_ops provided the shift and
width are set correctly..

> While we are here, use ARRAY_SIZE for number of parents.
>
> Tested on IPQ6018-CP01-C1 reference board and multiple IPQ8074 boards.
>
> Fixes: 5e77b4ef1b19 ("clk: qcom: Add ipq6018 apss clock controller")
> Signed-off-by: Robert Marko <robimarko@...il.com>
> ---
>  drivers/clk/qcom/apss-ipq6018.c | 13 ++++++-------
>  1 file changed, 6 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/clk/qcom/apss-ipq6018.c b/drivers/clk/qcom/apss-ipq6018.c
> index d78ff2f310bf..be952d417ded 100644
> --- a/drivers/clk/qcom/apss-ipq6018.c
> +++ b/drivers/clk/qcom/apss-ipq6018.c
> @@ -16,7 +16,7 @@
>  #include "clk-regmap.h"
>  #include "clk-branch.h"
>  #include "clk-alpha-pll.h"
> -#include "clk-regmap-mux.h"
> +#include "clk-rcg.h"
>
>  enum {
>         P_XO,
> @@ -33,16 +33,15 @@ static const struct parent_map parents_apcs_alias0_clk_src_map[] = {
>         { P_APSS_PLL_EARLY, 5 },
>  };
>
> -static struct clk_regmap_mux apcs_alias0_clk_src = {
> -       .reg = 0x0050,
> -       .width = 3,
> -       .shift = 7,

Judging from rcg2 ops, .shift should be set to 8.

> +static struct clk_rcg2 apcs_alias0_clk_src = {
> +       .cmd_rcgr = 0x0050,
> +       .hid_width = 5,
>         .parent_map = parents_apcs_alias0_clk_src_map,
>         .clkr.hw.init = &(struct clk_init_data){
>                 .name = "apcs_alias0_clk_src",
>                 .parent_data = parents_apcs_alias0_clk_src,
> -               .num_parents = 2,
> -               .ops = &clk_regmap_mux_closest_ops,
> +               .num_parents = ARRAY_SIZE(parents_apcs_alias0_clk_src),
> +               .ops = &clk_rcg2_mux_closest_ops,
>                 .flags = CLK_SET_RATE_PARENT,
>         },
>  };
> --
> 2.36.1
>


--
With best wishes
Dmitry