linux-kernel - Re: [PATCH v2 2/4] drm/nouveau/dp: Use the generic helper to control LTTPR transparent mode

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Message-ID: <75cfd04ce5e176cda3fc9efcc2f0a8c650d12657.camel@redhat.com>
Date: Mon, 16 Dec 2024 15:36:49 -0500
From: Lyude Paul <lyude@...hat.com>
To: Abel Vesa <abel.vesa@...aro.org>, 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>, 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>,
 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, Sean Paul
 <sean@...rly.run>, Marijn Suijten <marijn.suijten@...ainline.org>
Cc: 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 v2 2/4] drm/nouveau/dp: Use the generic helper to
 control LTTPR transparent mode

Reviewed-by: Lyude Paul <lyude@...hat.com>

On Wed, 2024-12-11 at 15:04 +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, which
> is handling the explicit disabling of non-transparent mode and its
> disable->enable sequence mentioned in the DP Standard v2.0 section
> 3.6.6.1.
> 
> So use the new 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 | 17 ++---------------
>  1 file changed, 2 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/gpu/drm/nouveau/nouveau_dp.c b/drivers/gpu/drm/nouveau/nouveau_dp.c
> index bcda0105160f1450df855281e0d932606a5095dd..55691ec44abaa53c84e73358e33df1949bb1e35c 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_dp.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_dp.c
> @@ -79,21 +79,8 @@ nouveau_dp_probe_dpcd(struct nouveau_connector *nv_connector,
>  	    !drm_dp_read_lttpr_common_caps(aux, dpcd, outp->dp.lttpr.caps)) {
>  		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);
> -
> -			if (nr > 0) {
> -				ret = drm_dp_dpcd_writeb(aux, DP_PHY_REPEATER_MODE,
> -							      DP_PHY_REPEATER_MODE_NON_TRANSPARENT);
> -				if (ret != 1) {
> -					drm_dp_dpcd_writeb(aux, DP_PHY_REPEATER_MODE,
> -								DP_PHY_REPEATER_MODE_TRANSPARENT);
> -				} else {
> -					outp->dp.lttpr.nr = nr;
> -				}
> -			}
> -		}
> +		if (!drm_dp_lttpr_init(aux, nr))
> +			outp->dp.lttpr.nr = nr;
>  	}
>  
>  	ret = drm_dp_read_dpcd_caps(aux, dpcd);
> 

-- 
Cheers,
 Lyude Paul (she/her)
 Software Engineer at Red Hat

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