drm/i915/dp: Add support for HBR3 and TPS4 during link training

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DP spec 1.4 supports training pattern set 4 (TPS4) for HBR3 link
rate. This will be used in link training's channel equalization
phase if supported by both source and sink.
This patch adds the helpers to check if HBR3 is supported and uses
TPS4 in training pattern selection during link training.

Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Reviewed-by: James Ausmus <james.ausmus@intel.com>
Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180611222655.5696-2-paulo.r.zanoni@intel.com

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This commit is contained in:

Manasi Navare 2018-06-11 15:26:55 -07:00 • committed by Paulo Zanoni

parent 46b527d19c

commit 2edd532721

4 changed files with 44 additions and 14 deletions

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1

drivers/gpu/drm/i915/i915_reg.h

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17

drivers/gpu/drm/i915/intel_dp.c

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39

drivers/gpu/drm/i915/intel_dp_link_training.c

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1

drivers/gpu/drm/i915/intel_drv.h

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