linux-kernel - Re: [PATCH RFC 2/4] drm/nouveau/dp: Use the generic helper to control LTTPR transparent mode

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Message-ID: <Z1lWnY+TxSptkBiY@linaro.org>
Date: Wed, 11 Dec 2024 11:08:45 +0200
From: Abel Vesa <abel.vesa@...aro.org>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
	Karol Herbst <kherbst@...hat.com>, Lyude Paul <lyude@...hat.com>,
	Danilo Krummrich <dakr@...hat.com>,
	Jani Nikula <jani.nikula@...ux.intel.com>,
	Rodrigo Vivi <rodrigo.vivi@...el.com>,
	Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
	Tvrtko Ursulin <tursulin@...ulin.net>,
	Rob Clark <robdclark@...il.com>,
	Abhinav Kumar <quic_abhinavk@...cinc.com>,
	Sean Paul <sean@...rly.run>,
	Marijn Suijten <marijn.suijten@...ainline.org>,
	Bjorn Andersson <andersson@...nel.org>,
	Konrad Dybcio <konradybcio@...nel.org>,
	Johan Hovold <johan@...nel.org>, dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org, nouveau@...ts.freedesktop.org,
	intel-gfx@...ts.freedesktop.org, intel-xe@...ts.freedesktop.org,
	linux-arm-msm@...r.kernel.org, freedreno@...ts.freedesktop.org
Subject: Re: [PATCH RFC 2/4] drm/nouveau/dp: Use the generic helper to
 control LTTPR transparent mode

On 24-10-31 18:44:55, Dmitry Baryshkov wrote:
> On Thu, Oct 31, 2024 at 05:12:46PM +0200, Abel Vesa wrote:
> > LTTPRs operating modes are defined by the DisplayPort standard and the
> > generic framework now provides a helper to switch between them.
> > So use the drm generic helper instead as it makes the code a bit cleaner.
> > 
> > Signed-off-by: Abel Vesa <abel.vesa@...aro.org>
> > ---
> >  drivers/gpu/drm/nouveau/nouveau_dp.c | 9 +++------
> >  1 file changed, 3 insertions(+), 6 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/nouveau/nouveau_dp.c b/drivers/gpu/drm/nouveau/nouveau_dp.c
> > index bcda0105160f1450df855281e0d932606a5095dd..80264e6186246903fa037861fe37493646de0c6e 100644
> > --- a/drivers/gpu/drm/nouveau/nouveau_dp.c
> > +++ b/drivers/gpu/drm/nouveau/nouveau_dp.c
> > @@ -80,15 +80,12 @@ nouveau_dp_probe_dpcd(struct nouveau_connector *nv_connector,
> >  		int nr = drm_dp_lttpr_count(outp->dp.lttpr.caps);
> >  
> >  		if (nr) {
> > -			drm_dp_dpcd_writeb(aux, DP_PHY_REPEATER_MODE,
> > -						DP_PHY_REPEATER_MODE_TRANSPARENT);
> > +			drm_dp_lttpr_set_transparent_mode(aux, true);
> >  
> >  			if (nr > 0) {
> > -				ret = drm_dp_dpcd_writeb(aux, DP_PHY_REPEATER_MODE,
> > -							      DP_PHY_REPEATER_MODE_NON_TRANSPARENT);
> > +				ret = drm_dp_lttpr_set_transparent_mode(aux, false);
> >  				if (ret != 1) {
> > -					drm_dp_dpcd_writeb(aux, DP_PHY_REPEATER_MODE,
> > -								DP_PHY_REPEATER_MODE_TRANSPARENT);
> > +					drm_dp_lttpr_set_transparent_mode(aux, true);
> >  				} else {
> >  					outp->dp.lttpr.nr = nr;
> >  				}
> 
> Could you please extract this true-false-true dance to a new helper too?
> This way Intel driver can use the simple helper, the rest of the drivers
> can benefit having the common code.

Will be part of the new version.

> 
> > 
> > -- 
> > 2.34.1
> > 
> 
> -- 
> With best wishes
> Dmitry