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drm/i915: prefer wide & slow to fast & narrow in DP configs
commit 2514bc5 upstream. High frequency link configurations have the potential to cause trouble with long and/or cheap cables, so prefer slow and wide configurations instead. This patch has the potential to cause trouble for eDP configurations that lie about available lanes, so if we run into that we can make it conditional on eDP. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=45801 Tested-by: firstname.lastname@example.org Signed-off-by: Jesse Barnes <email@example.com> Signed-off-by: Daniel Vetter <firstname.lastname@example.org> Signed-off-by: Ben Hutchings <email@example.com>
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