Re: [PATCH v2, 07/17] drm/mediatek: add disp config and mm 26mhz clock into mutex device

[Nicolas Boichat <drinkcat@chromium.org>]

On Sat, Dec 12, 2020 at 12:12 PM Yongqiang Niu
<yongqiang.niu@mediatek.com> wrote:
>
> there are 2 more clock need enable for display.
> parser these clock when mutex device probe,
> enable and disable when mutex on/off
>
> Signed-off-by: Yongqiang Niu <yongqiang.niu@mediatek.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_drm_ddp.c | 49 ++++++++++++++++++++++++++++------
>  1 file changed, 41 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp.c
> index 60788c1..de618a1 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp.c
> @@ -118,7 +118,7 @@ struct mtk_ddp_data {
>
>  struct mtk_ddp {
>         struct device                   *dev;
> -       struct clk                      *clk;
> +       struct clk                      *clk[3];
>         void __iomem                    *regs;
>         struct mtk_disp_mutex           mutex[10];
>         const struct mtk_ddp_data       *data;
> @@ -257,14 +257,39 @@ int mtk_disp_mutex_prepare(struct mtk_disp_mutex *mutex)
>  {
>         struct mtk_ddp *ddp = container_of(mutex, struct mtk_ddp,
>                                            mutex[mutex->id]);
> -       return clk_prepare_enable(ddp->clk);
> +       int ret;
> +       int i;
> +
> +       for (i = 0; i < ARRAY_SIZE(ddp->clk); i++) {
> +               if (IS_ERR(ddp->clk[i]))
> +                       continue;
> +               ret = clk_prepare_enable(ddp->clk[i]);
> +               if (ret) {
> +                       pr_err("failed to enable clock, err %d. i:%d\n",
> +                               ret, i);
> +                       goto err;
> +               }
> +       }
> +
> +       return 0;
> +
> +err:
> +       while (--i >= 0)
> +               clk_disable_unprepare(ddp->clk[i]);
> +       return ret;
>  }
>
>  void mtk_disp_mutex_unprepare(struct mtk_disp_mutex *mutex)
>  {
>         struct mtk_ddp *ddp = container_of(mutex, struct mtk_ddp,
>                                            mutex[mutex->id]);
> -       clk_disable_unprepare(ddp->clk);
> +       int i;
> +
> +        for (i = 0; i < ARRAY_SIZE(ddp->clk); i++) {
> +               if (IS_ERR(ddp->clk[i]))
> +                       continue;
> +               clk_disable_unprepare(ddp->clk[i]);
> +       }
>  }
>
>  void mtk_disp_mutex_add_comp(struct mtk_disp_mutex *mutex,
> @@ -415,11 +440,19 @@ static int mtk_ddp_probe(struct platform_device *pdev)
>         ddp->data = of_device_get_match_data(dev);
>
>         if (!ddp->data->no_clk) {
> -               ddp->clk = devm_clk_get(dev, NULL);
> -               if (IS_ERR(ddp->clk)) {
> -                       if (PTR_ERR(ddp->clk) != -EPROBE_DEFER)
> -                               dev_err(dev, "Failed to get clock\n");
> -                       return PTR_ERR(ddp->clk);
> +               int ret;
> +
> +               for (i = 0; i < ARRAY_SIZE(ddp->clk); i++) {
> +                       ddp->clk[i] = of_clk_get(dev->of_node, i);
> +
> +                       if (IS_ERR(ddp->clk[i])) {
> +                               ret = PTR_ERR(ddp->clk[i]);
> +                               if (ret != EPROBE_DEFER)
> +                                       dev_err(dev, "Failed to get clock %d\n",
> +                                               ret);
> +
> +                               return ret;
> +                       }

Use of_clk_bulk_get_all instead?

ddp->num_clks = of_clk_bulk_get_all(dev->of_node, &ddp->clks);
...

Then the calls above can be clk_bulk_enable/clk_bulk_disable using
num_clks and clks.


>                 }
>         }
>
> --
> 1.8.1.1.dirty
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