linux-kernel - Re: [PATCH v2] drm/mgag200: fix mgag200_bmc_stop

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Message-ID: <4d203020-25c6-4d88-a850-f455e0c59f36@intel.com>
Date: Tue, 3 Feb 2026 15:01:50 -0800
From: Jacob Keller <jacob.e.keller@...el.com>
To: Thomas Zimmermann <tzimmermann@...e.de>, Dave Airlie <airlied@...hat.com>,
	Jocelyn Falempe <jfalempe@...hat.com>, Maarten Lankhorst
	<maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>,
	Simona Vetter <simona@...ll.ch>
CC: Pasi Vaananen <pvaanane@...hat.com>, <dri-devel@...ts.freedesktop.org>,
	<linux-kernel@...r.kernel.org>, <stable@...r.kernel.org>
Subject: Re: [PATCH v2] drm/mgag200: fix mgag200_bmc_stop_scanout()



On 2/2/2026 11:37 PM, Thomas Zimmermann wrote:
> Hi,
> 
> thanks for fixing this issue. Just FTR, I looked through the original 
> implementation in the user-space driver and found the same bug. This 
> code was added in 2008 by commit 62c8f0a ("Bug #16545: Add G200WB 
> support.")
> 
>   https://gitlab.freedesktop.org/xorg/driver/xf86-video-mga/-/blob/ 
> master/src/mga_dacG.c?ref_type=heads#L740
> 
Interesting note: the original code in the user-space driver used 
usleep, and that then got translated to a udelay when coming over to the 
kernel.