linux-kernel - Re: [PATCH] drm/arcpgu: use .mode_fixup instead of .atomic

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Date:   Fri, 3 Mar 2017 18:05:15 +0000
From:   Jose Abreu <Jose.Abreu@...opsys.com>
To:     Alexey Brodkin <Alexey.Brodkin@...opsys.com>,
        "daniel@...ll.ch" <daniel@...ll.ch>
CC:     "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Jose.Abreu@...opsys.com" <Jose.Abreu@...opsys.com>,
        "daniel.vetter@...ll.ch" <daniel.vetter@...ll.ch>,
        "linux-snps-arc@...ts.infradead.org" 
        <linux-snps-arc@...ts.infradead.org>,
        "airlied@...ux.ie" <airlied@...ux.ie>
Subject: Re: [PATCH] drm/arcpgu: use .mode_fixup instead of .atomic_check

Hi Alexey,


On 03-03-2017 13:27, Alexey Brodkin wrote:
>
> So if I understood you correct here what I really need is just to get rid of existing check,
> right? I.e. the following is to be in v2 respin:
> ------------------------------->8-------------------------------
> diff --git a/drivers/gpu/drm/arc/arcpgu_crtc.c b/drivers/gpu/drm/arc/arcpgu_crtc.c
> index ad9a95916f1f..86f1555914e8 100644
> --- a/drivers/gpu/drm/arc/arcpgu_crtc.c
> +++ b/drivers/gpu/drm/arc/arcpgu_crtc.c
> @@ -129,20 +129,6 @@ static void arc_pgu_crtc_disable(struct drm_crtc *crtc)
>                               ~ARCPGU_CTRL_ENABLE_MASK);
>  }
>  
> -static int arc_pgu_crtc_atomic_check(struct drm_crtc *crtc,
> -                                    struct drm_crtc_state *state)
> -{
> -       struct arcpgu_drm_private *arcpgu = crtc_to_arcpgu_priv(crtc);
> -       struct drm_display_mode *mode = &state->adjusted_mode;
> -       long rate, clk_rate = mode->clock * 1000;
> -
> -       rate = clk_round_rate(arcpgu->clk, clk_rate);
> -       if (rate != clk_rate)
> -               return -EINVAL;
> -
> -       return 0;
> -}
> -
>  static void arc_pgu_crtc_atomic_begin(struct drm_crtc *crtc,
>                                       struct drm_crtc_state *state)
>  {
> @@ -165,7 +151,6 @@ static const struct drm_crtc_helper_funcs arc_pgu_crtc_helper_funcs = {
>         .disable        = arc_pgu_crtc_disable,
>         .prepare        = arc_pgu_crtc_disable,
>         .commit         = arc_pgu_crtc_enable,
> -       .atomic_check   = arc_pgu_crtc_atomic_check,
>         .atomic_begin   = arc_pgu_crtc_atomic_begin,
>  };
> ------------------------------->8-------------------------------

I don't think you can remove the check entirely as this will make
any mode be accepted, right?

Best regards,
Jose Miguel Abreu