linux-kernel - Re: [PATCH v2 0/4] drm/dp_mst: Fix bandwidth checking regressions from DSC patches

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Message-ID: <f2ad071d-ae50-d840-439b-dc2df85cc88f@redhat.com>
Date:   Sat, 7 Mar 2020 13:05:44 +0100
From:   Hans de Goede <hdegoede@...hat.com>
To:     Lyude Paul <lyude@...hat.com>, dri-devel@...ts.freedesktop.org
Cc:     Mikita Lipski <mikita.lipski@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Sean Paul <seanpaul@...gle.com>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        linux-kernel@...r.kernel.org,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Maxime Ripard <mripard@...nel.org>
Subject: Re: [PATCH v2 0/4] drm/dp_mst: Fix bandwidth checking regressions
 from DSC patches

Hi,

On 3/7/20 12:46 AM, Lyude Paul wrote:
> AMD's patch series for adding DSC support to the MST helpers
> unfortunately introduced a few regressions into the kernel that I didn't
> get around to fixing until just now. I would have reverted the changes
> earlier, but seeing as that would have reverted all of amd's DSC support
> + everything that was done on top of that I realllllly wanted to avoid
> doing that.
> 
> Anyway, this should fix everything bandwidth-check related as far as I
> can tell (I found some other regressions unrelated to AMD's DSC patches
> which I'll be sending out patches for shortly). Note that I don't have
> any DSC displays locally yet, so if someone from AMD could sanity check
> this I would appreciate it ♥.

I can confirm that this series fixes only of the 2 FHD monitors on
my Lenovo TB3 gen 2 dock lighting up, thank you!

This series is:

Tested-by: Hans de Goede <hdegoede@...hat.com>

Regards,

Hans



> 
> Cc: Mikita Lipski <mikita.lipski@....com>
> Cc: Alex Deucher <alexander.deucher@....com>
> Cc: Sean Paul <seanpaul@...gle.com>
> Cc: Hans de Goede <hdegoede@...hat.com>
> 
> Lyude Paul (4):
>    drm/dp_mst: Rename drm_dp_mst_is_dp_mst_end_device() to be less
>      redundant
>    drm/dp_mst: Use full_pbn instead of available_pbn for bandwidth checks
>    drm/dp_mst: Reprobe path resources in CSN handler
>    drm/dp_mst: Rewrite and fix bandwidth limit checks
> 
>   drivers/gpu/drm/drm_dp_mst_topology.c | 185 ++++++++++++++++++--------
>   include/drm/drm_dp_mst_helper.h       |   4 +-
>   2 files changed, 129 insertions(+), 60 deletions(-)
>