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

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Date:   Wed, 23 Dec 2020 09:23:49 +0800
From:   Yongqiang Niu <yongqiang.niu@...iatek.com>
To:     Nicolas Boichat <drinkcat@...omium.org>
CC:     CK Hu <ck.hu@...iatek.com>, Philipp Zabel <p.zabel@...gutronix.de>,
        "Rob Herring" <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Mark Rutland <mark.rutland@....com>,
        Devicetree List <devicetree@...r.kernel.org>,
        David Airlie <airlied@...ux.ie>,
        lkml <linux-kernel@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        Daniel Vetter <daniel@...ll.ch>,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2, 07/17] drm/mediatek: add disp config and mm 26mhz
 clock into mutex device

On Tue, 2020-12-15 at 21:37 +0800, Nicolas Boichat wrote:
> On Sat, Dec 12, 2020 at 12:12 PM Yongqiang Niu
> <yongqiang.niu@...iatek.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@...iatek.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.
> 

will be fixed in next version
> 
> >                 }
> >         }
> >
> > --
> > 1.8.1.1.dirty
> > _______________________________________________
> > Linux-mediatek mailing list
> > Linux-mediatek@...ts.infradead.org
> > http://lists.infradead.org/mailman/listinfo/linux-mediatek

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