linux-kernel - Re: [PATCH v2 2/3] drm/amd/display: consider DSC pass-through during mode validation

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Date:   Thu, 11 Aug 2022 13:02:50 +0200
From:   Anders Roxell <anders.roxell@...aro.org>
To:     Hamza Mahfooz <hamza.mahfooz@....com>
Cc:     linux-kernel@...r.kernel.org,
        Harry Wentland <harry.wentland@....com>,
        Fangzhi Zuo <Jerry.Zuo@....com>, Wayne Lin <Wayne.Lin@....com>,
        Aurabindo Pillai <aurabindo.pillai@....com>,
        hersenxs.wu@....com, Leo Li <sunpeng.li@....com>,
        Rodrigo Siqueira <Rodrigo.Siqueira@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        "Pan, Xinhui" <Xinhui.Pan@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, Lyude Paul <lyude@...hat.com>,
        Mikita Lipski <mikita.lipski@....com>,
        Claudio Suarez <cssk@...-c.es>,
        Bhawanpreet Lakha <Bhawanpreet.Lakha@....com>,
        Roman Li <Roman.Li@....com>, Ian Chen <ian.chen@....com>,
        Colin Ian King <colin.king@...el.com>,
        Nicholas Kazlauskas <nicholas.kazlauskas@....com>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Jani Nikula <jani.nikula@...el.com>,
        Imran Khan <imran.f.khan@...cle.com>,
        Ville Syrjälä <ville.syrjala@...ux.intel.com>,
        Kees Cook <keescook@...omium.org>,
        Imre Deak <imre.deak@...el.com>,
        Sankeerth Billakanti <quic_sbillaka@...cinc.com>,
        Javier Martinez Canillas <javierm@...hat.com>,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH v2 2/3] drm/amd/display: consider DSC pass-through during
 mode validation


On 2022-08-05 17:13, Hamza Mahfooz wrote:
> Add a mode validation routine for DSC pass-through. Both the link from
> source to hub, and the link from hub to monitor are checked, according
> to the current link training result and full pbn returned by enum path
> resource sideband message.
> 
> Pick up the minimum value as the bandwidth bottleneck for the end to
> end link bandwidth constraint, and check if the maximum DSC decompression
> bandwidth can fit.
> 
> Co-authored-by: Fangzhi Zuo <Jerry.Zuo@....com>
> Signed-off-by: Hamza Mahfooz <hamza.mahfooz@....com>

Hi,

Building an arm64 allmodconfig kernel from todays next tag, next-20220811.
I can see the following build error.

ERROR: modpost: "dc_dsc_compute_bandwidth_range" [drivers/gpu/drm/amd/amdgpu/amdgpu.ko] undefined!
ERROR: modpost: "dc_dsc_get_policy_for_timing" [drivers/gpu/drm/amd/amdgpu/amdgpu.ko] undefined!

When I reverted this patch I was able to build an arm64 allmodconfig
kernel.


Cheers,
Anders