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Date:   Sat, 7 Mar 2020 13:05:44 +0100
From:   Hans de Goede <>
To:     Lyude Paul <>,
Cc:     Mikita Lipski <>,
        Alex Deucher <>,
        Sean Paul <>,
        Daniel Vetter <>,
        David Airlie <>,
        Maarten Lankhorst <>,,
        Thomas Zimmermann <>,
        Maxime Ripard <>
Subject: Re: [PATCH v2 0/4] drm/dp_mst: Fix bandwidth checking regressions
 from DSC patches


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 <>



> Cc: Mikita Lipski <>
> Cc: Alex Deucher <>
> Cc: Sean Paul <>
> Cc: Hans de Goede <>
> 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(-)

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