[Intel-gfx] [PATCH 0/4] Add Automation Support for DP Compliance (Rev 5)

[Manasi Navare]

This series addresses review comments from the previous series:
https://patchwork.freedesktop.org/series/18150/

Apart from addressing review comments, it also adds a fix for
CRC mismatch errors in Compliance tests 4.4.1.1 - 4.4.1.3

DP 1.2 compliance testing can be acheived using DPR-120's CTS suite.
This compliance unit sends a short pulse to initiate link training
and video pattern generation compliance tests and sends a long pulse
to initate EDID compliance tests. It also sets the AUTOMATED TEST REQUEST
bit in Device IRQ to 1. These patches add support in the kernel to respond
to these test requests sent by DPR-120. The test handler has been added for
Link training/EDID and Video pattern compliance tests that gets invoked on
short/long pulse sent by DPR-120. The test handler for each of the tests
reads the corresponding DPCD registers to read the test parameters.

These tests need to be run with the IGT DP compliance automation tool.
Link Training Tests (4.3.1.1 - 4.3.2.3):
It reads the DPCD registers to get the link rate and lane count requested by
test and sends a hotplug uevent for the userspace to redo a modeset in order
to train the link at the requested test parameters.

EDID Tests (4.2.2.3 - 4.2.2.6):
It reads the EDID set by the DPR-120, if EDID read succeeds, it sets the
video mode to PREFERRED and sets the test_active flag. This flag wakes up
the IGT compliance tool that then fills the framebuffers and triggers a
modeset.

Video Pattern Tests (4.3.3.1):
It reads the DPCD registers to set the requested video pattern parameters.
It then sets the test active flag that wakes up the IGT tool, userspace
reads the video pattern values from corresponding debugfs files and fills the
framebuffers and triggers a modeset.
If the requested video pattern is 18bpp, then we force the dither to be off
so that CRC for the RGB pixels of the rendered video pattern matches the expected
CRC.

Manasi Navare (4):
  drm/i915: Add support for DP link training compliance
  drm/i915: Fixes to support DP Compliance EDID tests
  drm: Add definitions for DP compliance Video pattern tests
  drm/i915: Add support for DP Video pattern compliance tests

 drivers/gpu/drm/i915/i915_debugfs.c  |  14 +++-
 drivers/gpu/drm/i915/intel_display.c |   8 ++-
 drivers/gpu/drm/i915/intel_dp.c      | 130 +++++++++++++++++++++++++++++++++--
 drivers/gpu/drm/i915/intel_dp_mst.c  |   7 +-
 drivers/gpu/drm/i915/intel_drv.h     |  13 ++++
 include/drm/drm_dp_helper.h          |  64 +++++++++++++++++
 6 files changed, 225 insertions(+), 11 deletions(-)

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1.9.1