drm/i915: Disable LTTPR support when the LTTPR rev < 1.4

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By the specification the 0xF0000 - 0xF02FF range is only valid if the
LTTPR revision at 0xF0000 is at least 1.4. Disable the LTTPR support
otherwise.

Fixes: 7b2a4ab8b0 ("drm/i915: Switch to LTTPR transparent mode link training")
Cc: <stable@vger.kernel.org> # v5.11
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210317184901.4029798-4-imre.deak@intel.com
(cherry picked from commit 1663ad4936)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

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This commit is contained in:

Imre Deak 2021-03-17 20:49:01 +02:00 • committed by Rodrigo Vivi

parent 7dffbdedb9

commit ab03631087

1 changed files with 10 additions and 4 deletions

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14

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

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