linux-kernel - Re: [PATCH RESEND] drm/bridge: anx7625: Use common macros for DP power sequencing commands

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Date:   Tue, 11 Jul 2023 11:42:10 +0800
From:   Chen-Yu Tsai <wenst@...omium.org>
To:     Jani Nikula <jani.nikula@...ux.intel.com>
Cc:     Andrzej Hajda <andrzej.hajda@...el.com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Robert Foss <rfoss@...nel.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Xin Ji <xji@...logixsemi.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Nícolas F. R. A. Prado 
        <nfraprado@...labora.com>, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH RESEND] drm/bridge: anx7625: Use common macros for DP
 power sequencing commands

On Mon, Jul 10, 2023 at 6:32 PM Jani Nikula <jani.nikula@...ux.intel.com> wrote:
>
> On Mon, 10 Jul 2023, Chen-Yu Tsai <wenst@...omium.org> wrote:
> > The DRM DP code has macros for the DP power sequencing commands. Use
> > them in the anx7625 driver instead of raw numbers.
> >
> > Fixes: 548b512e144f ("drm/bridge: anx7625: send DPCD command to downstream")
> > Fixes: 27f26359de9b ("drm/bridge: anx7625: Set downstream sink into normal status")
> > Signed-off-by: Chen-Yu Tsai <wenst@...omium.org>
> > Reviewed-by: Nícolas F. R. A. Prado <nfraprado@...labora.com>
> > ---
> > Collected tags and rebased on v6.5-rc1.
> >
> >  drivers/gpu/drm/bridge/analogix/anx7625.c | 8 ++++----
> >  1 file changed, 4 insertions(+), 4 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.c b/drivers/gpu/drm/bridge/analogix/anx7625.c
> > index 8b985efdc086..9db3784cb554 100644
> > --- a/drivers/gpu/drm/bridge/analogix/anx7625.c
> > +++ b/drivers/gpu/drm/bridge/analogix/anx7625.c
> > @@ -931,8 +931,8 @@ static void anx7625_dp_start(struct anx7625_data *ctx)
> >
> >       dev_dbg(dev, "set downstream sink into normal\n");
> >       /* Downstream sink enter into normal mode */
> > -     data = 1;
> > -     ret = anx7625_aux_trans(ctx, DP_AUX_NATIVE_WRITE, 0x000600, 1, &data);
> > +     data = DP_SET_POWER_D0;
> > +     ret = anx7625_aux_trans(ctx, DP_AUX_NATIVE_WRITE, DP_SET_POWER, 1, &data);
>
> So you have code to implement the drm dp aux abstractions, why aren't
> you using drm_dp_dpcd_writeb() and friends here?

I didn't write the original code. Nor do I do much DP stuff. IIRC someone
pointed out to me these had proper macros, so I converted them.

Would you accept a follow-up patch to convert the AUX transfers to the
DRM abstractions?

ChenYu

> BR,
> Jani.
>
>
> >       if (ret < 0)
> >               dev_err(dev, "IO error : set sink into normal mode fail\n");
> >
> > @@ -971,8 +971,8 @@ static void anx7625_dp_stop(struct anx7625_data *ctx)
> >
> >       dev_dbg(dev, "notify downstream enter into standby\n");
> >       /* Downstream monitor enter into standby mode */
> > -     data = 2;
> > -     ret |= anx7625_aux_trans(ctx, DP_AUX_NATIVE_WRITE, 0x000600, 1, &data);
> > +     data = DP_SET_POWER_D3;
> > +     ret |= anx7625_aux_trans(ctx, DP_AUX_NATIVE_WRITE, DP_SET_POWER, 1, &data);
> >       if (ret < 0)
> >               DRM_DEV_ERROR(dev, "IO error : mute video fail\n");
>
> --
> Jani Nikula, Intel Open Source Graphics Center