linux-kernel - Re: [RFC PATCH RESEND v4 0/6] drm/display: dp: add new DPCD access functions

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Message-ID: <174291251084.2000243.209850835590674876.b4-ty@oss.qualcomm.com>
Date: Tue, 25 Mar 2025 16:21:55 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Lyude Paul <lyude@...hat.com>,
        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>,
        Rob Clark <robdclark@...il.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>, Sean Paul <sean@...rly.run>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        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>,
        Xinliang Liu <xinliang.liu@...aro.org>,
        Tian Tao <tiantao6@...ilicon.com>,
        Xinwei Kong <kong.kongxinwei@...ilicon.com>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Yongqin Liu <yongqin.liu@...aro.org>, John Stultz <jstultz@...gle.com>,
        Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, freedreno@...ts.freedesktop.org,
        intel-gfx@...ts.freedesktop.org, intel-xe@...ts.freedesktop.org,
        amd-gfx@...ts.freedesktop.org,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Jani Nikula <jani.nikula@...el.com>
Subject: Re: [RFC PATCH RESEND v4 0/6] drm/display: dp: add new DPCD access functions

On Mon, 24 Mar 2025 13:51:18 +0200, Dmitry Baryshkov wrote:
> Existing DPCD access functions return an error code or the number of
> bytes being read / write in case of partial access. However a lot of
> drivers either (incorrectly) ignore partial access or mishandle error
> codes. In other cases this results in a boilerplate code which compares
> returned value with the size.
> 
> As suggested by Jani implement new set of DPCD access helpers, which
> ignore partial access, always return 0 or an error code. Implement
> new helpers using existing functions to ensure backwards compatibility
> and to assess necessity to handle incomplete reads on a global scale.
> Currently only one possible place has been identified, dp-aux-dev, which
> needs to handle possible holes in DPCD.
> 
> [...]

Applied to drm-misc-next, thanks!

[1/6] drm/display: dp: implement new access helpers
      commit: d8343e115658fb35115e0720f4761ffa0147329a
[2/6] drm/display: dp: change drm_dp_dpcd_read_link_status() return value
      commit: fcbb93f1e48a150159534a1e6ec19e6fdf9196df
[3/6] drm/display: dp: use new DCPD access helpers
      commit: af67978ee37e543e62d6d3f7eba58f8f259423a7
[4/6] drm/display: dp-cec: use new DCPD access helpers
      commit: 97f37939881327e118d6252289973c186377a075
[5/6] drm/display: dp-mst-topology: use new DCPD access helpers
      commit: 2554da0de3e8312c7149d03d702ddc6c1ff5e3de
[6/6] drm/display: dp-tunnel: use new DCPD access helpers
      commit: 95c4ea2e0329b370a53a041a19227f8da3f47481

Best regards,
-- 
With best wishes
Dmitry