linux-kernel - Re: [PATCH 1/2] drm/amdgpu: make duplicated EOP packet for GFX7/8 have real content

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Message-ID: <e27a5acebe5c7d1e09edbc9dc49f52b672d72988.camel@xry111.site>
Date: Mon, 17 Jun 2024 23:35:33 +0800
From: Xi Ruoyao <xry111@...111.site>
To: Icenowy Zheng <uwu@...nowy.me>, Christian König
 <christian.koenig@....com>, Alex Deucher <alexander.deucher@....com>, Pan
 Xinhui <Xinhui.Pan@....com>, David Airlie <airlied@...il.com>, Daniel
 Vetter <daniel@...ll.ch>,  Pierre-Eric Pelloux-Prayer
 <pierre-eric.pelloux-prayer@....com>, Huacai Chen <chenhuacai@...nel.org>,
 WANG Xuerui <kernel@...0n.name>
Cc: amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org, 
	linux-kernel@...r.kernel.org, loongarch@...ts.linux.dev
Subject: Re: [PATCH 1/2] drm/amdgpu: make duplicated EOP packet for GFX7/8
 have real content

On Mon, 2024-06-17 at 22:30 +0800, Icenowy Zheng wrote:
> > Two consecutive writes to the same bus address are perfectly legal
> > from 
> > the PCIe specification and can happen all the time, even without this
> > specific hw workaround.
> 
> Yes I know it, and I am not from Loongson, just some user trying to
> mess around it.

There are some purposed "workarounds" like reducing the link speed (from
x16 to x8), tweaking the power management setting, etc.  Someone even
claims improving the heat sink of the LS7A chip can help to work around
this issue but I'm really skeptical...

-- 
Xi Ruoyao <xry111@...111.site>
School of Aerospace Science and Technology, Xidian University