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: <hh26gzyjhygphlrmhh2zkskoz7vezkgdepbx7fnzgfch75simf@hmr5ezp4khwi>
Date: Thu, 31 Oct 2024 18:44:55 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Abel Vesa <abel.vesa@...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 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.

> 
> -- 
> 2.34.1
> 

-- 
With best wishes
Dmitry