Only specific N value (0x8000) would be acceptable for LG LP140WF6-SPM1 eDP panel which is running at asynchronous clock mode. With the other N value, it will enter BITS mode and display black screen. This patch series set constant N value for specific sink/branch device that would cover similar issue.
Cc: Jani Nikula jani.nikula@intel.com Cc: Cooper Chiou cooper.chiou@intel.com Cc: Matt Atwood matthew.s.atwood@intel.com Cc: Maarten Lankhorst maarten.lankhorst@linux.intel.com Cc: Dhinakaran Pandiyan dhinakaran.pandiyan@intel.com Cc: Clint Taylor clinton.a.taylor@intel.com
Lee, Shawn C (3): drm: Add support for device_id based detection. drm: Change limited M/N quirk to constant N quirk. drm: add LG eDP panel to quirk database
drivers/gpu/drm/drm_dp_helper.c | 17 ++++++++++++++++- drivers/gpu/drm/i915/intel_display.c | 28 +++++++++++++--------------- drivers/gpu/drm/i915/intel_display.h | 2 +- drivers/gpu/drm/i915/intel_dp.c | 8 ++++---- drivers/gpu/drm/i915/intel_dp_mst.c | 6 +++--- include/drm/drm_dp_helper.h | 6 +++--- 6 files changed, 40 insertions(+), 27 deletions(-)