drm/i915/bios: Clamp VBT HDMI level shift on BDW

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Apparently some BDW machines (eg. HP Pavilion 15-ab) shipped with
a VBT inherited from some earlier HSW model. On HSW the HDMI level
shift value could go up to 11, whereas on BDW the maximum value is
9.

The DDI code does clamp the bogus value, but it does so with
a WARN which we don't really want. To avoid that let's just sanitize
the bogus VBT HDMI level shift value ahead of time for all BDW machines.

Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/9461
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231013140214.1713-1-ville.syrjala@linux.intel.com
Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>

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Ville Syrjälä 2023-10-13 17:02:14 +03:00

parent 75658332bb

commit 9e372744c0

1 changed files with 22 additions and 0 deletions

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drivers/gpu/drm/i915/display/intel_bios.c

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