linux-kernel - Re: [PATCH v5 7/9] clk: mediatek: Add configurable pcw_chg_reg to mtk_pll

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Date:   Fri, 8 Mar 2019 14:23:58 +0800
From:   Nicolas Boichat <drinkcat@...omium.org>
To:     Weiyi Lu <weiyi.lu@...iatek.com>
Cc:     Matthias Brugger <matthias.bgg@...il.com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Rob Herring <robh@...nel.org>,
        James Liao <jamesjj.liao@...iatek.com>,
        Fan Chen <fan.chen@...iatek.com>,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        lkml <linux-kernel@...r.kernel.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>, linux-clk@...r.kernel.org,
        srv_heupstream <srv_heupstream@...iatek.com>,
        stable@...r.kernel.org
Subject: Re: [PATCH v5 7/9] clk: mediatek: Add configurable pcw_chg_reg to mtk_pll_data

On Tue, Mar 5, 2019 at 1:05 PM Weiyi Lu <weiyi.lu@...iatek.com> wrote:
>
> In previous MediaTek PLL design, it assumes the pcw change control
> is always on the CON1 register.
> However, the pcw change bit on MT8183 was moved onto CON0 because
> the the PCW length of audio PLLs are extended to 32-bit.
> Add configurable pcw_chg_reg to set the pcw change control register
> address or using the default control register CON1 if without
> setting in pll data.
>
> Signed-off-by: Weiyi Lu <weiyi.lu@...iatek.com>

Reviewed-and-tested-by: Nicolas Boichat <drinkcat@...omium.org>

> ---
>  drivers/clk/mediatek/clk-mtk.h |  1 +
>  drivers/clk/mediatek/clk-pll.c | 17 +++++++++++------
>  2 files changed, 12 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/clk/mediatek/clk-mtk.h b/drivers/clk/mediatek/clk-mtk.h
> index 928905496c4b..37ae944548e9 100644
> --- a/drivers/clk/mediatek/clk-mtk.h
> +++ b/drivers/clk/mediatek/clk-mtk.h
> @@ -221,6 +221,7 @@ struct mtk_pll_data {
>         int pcwibits;
>         uint32_t pcw_reg;
>         int pcw_shift;
> +       uint32_t pcw_chg_reg;
>         const struct mtk_pll_div_table *div_table;
>         const char *parent_name;
>  };
> diff --git a/drivers/clk/mediatek/clk-pll.c b/drivers/clk/mediatek/clk-pll.c
> index 67aaa3082d9b..65cee1d6c400 100644
> --- a/drivers/clk/mediatek/clk-pll.c
> +++ b/drivers/clk/mediatek/clk-pll.c
> @@ -27,7 +27,7 @@
>  #define CON0_BASE_EN           BIT(0)
>  #define CON0_PWR_ON            BIT(0)
>  #define CON0_ISO_EN            BIT(1)
> -#define CON0_PCW_CHG           BIT(31)
> +#define PCW_CHG_MASK           BIT(31)
>
>  #define AUDPLL_TUNER_EN                BIT(31)
>
> @@ -51,6 +51,7 @@ struct mtk_clk_pll {
>         void __iomem    *tuner_addr;
>         void __iomem    *tuner_en_addr;
>         void __iomem    *pcw_addr;
> +       void __iomem    *pcw_chg_addr;
>         const struct mtk_pll_data *data;
>  };
>
> @@ -122,7 +123,7 @@ static void __mtk_pll_tuner_disable(struct mtk_clk_pll *pll)
>  static void mtk_pll_set_rate_regs(struct mtk_clk_pll *pll, u32 pcw,
>                 int postdiv)
>  {
> -       u32 con1, val;
> +       u32 chg, val;
>         int pll_en;
>
>         pll_en = readl(pll->base_addr + REG_CON0) & CON0_BASE_EN;
> @@ -147,14 +148,14 @@ static void mtk_pll_set_rate_regs(struct mtk_clk_pll *pll, u32 pcw,
>         val |= pcw << pll->data->pcw_shift;
>         writel(val, pll->pcw_addr);
>
> -       con1 = readl(pll->base_addr + REG_CON1);
> +       chg = readl(pll->pcw_chg_addr);
>
>         if (pll_en)
> -               con1 |= CON0_PCW_CHG;
> +               chg |= PCW_CHG_MASK;
>
> -       writel(con1, pll->base_addr + REG_CON1);
> +       writel(chg, pll->pcw_chg_addr);
>         if (pll->tuner_addr)
> -               writel(con1 + 1, pll->tuner_addr);
> +               writel(val + 1, pll->tuner_addr);
>
>         /* restore tuner_en */
>         __mtk_pll_tuner_enable(pll);
> @@ -329,6 +330,10 @@ static struct clk *mtk_clk_register_pll(const struct mtk_pll_data *data,
>         pll->pwr_addr = base + data->pwr_reg;
>         pll->pd_addr = base + data->pd_reg;
>         pll->pcw_addr = base + data->pcw_reg;
> +       if (data->pcw_chg_reg)
> +               pll->pcw_chg_addr = base + data->pcw_chg_reg;
> +       else
> +               pll->pcw_chg_addr = pll->base_addr + REG_CON1;
>         if (data->tuner_reg)
>                 pll->tuner_addr = base + data->tuner_reg;
>         if (data->tuner_en_reg)
> --
> 2.18.0
>