NACK Re: [SRU][OEM-5.14/J][PATCH 0/1] Apply w/a for hard hang on HPD

Timo Aaltonen tjaalton at ubuntu.com
Thu Aug 25 13:12:46 UTC 2022


Bin Li kirjoitti 15.8.2022 klo 8.33:
> BugLink: https://bugs.launchpad.net/bugs/1985901
> 
> [Impact]
> When connecting the ThinkVision 24i monitor on ThinkPad L14, the kernel
> will hang.
> 
> kernel: watchdog: BUG: soft lockup - CPU#0 stuck for 50s! [Xorg:1829]
> 
> [Fix]
> cherry picked from commit 2a50edbf10c8c56e930bfb53d8f9f00a33fd837e
> linux-next
> 
> [Test]
> After applying the patch, the os works fine with the external monitor.
> 
> [Where problems could occur]
> This commit is clean cherry-picked for drm/amd/display, it disable
> 48mhz refclk off when there is any HPD status in connected state.
> It should be a low risk to introduce any regression.
> 
> Qingqing Zhuo (1):
>    drm/amd/display: Apply w/a for hard hang on HPD
> 
>   .../amd/display/dc/clk_mgr/dcn21/rn_clk_mgr.c | 12 ++++++++-
>   .../display/dc/irq/dcn21/irq_service_dcn21.c  | 25 +++++++++++++++++++
>   .../display/dc/irq/dcn21/irq_service_dcn21.h  |  2 ++
>   .../gpu/drm/amd/display/dc/irq/irq_service.c  |  2 +-
>   .../gpu/drm/amd/display/dc/irq/irq_service.h  |  4 +++
>   5 files changed, 43 insertions(+), 2 deletions(-)
> 

this was reverted upstream in 5.17-rc1

commit e8521d0cd984897b4fa58e7837afebd04e44f0b3
Author: Mario Limonciello <mario.limonciello at amd.com>
Date:   Fri Jan 7 10:44:17 2022 -0600

     drm/amd/display: Revert W/A for hard hangs on DCN20/DCN21



-- 
t



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