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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.