On Mon, Sep 10, 2018 at 10:55 AM Alex Deucher wrote: >> >> 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. > >Is this an explicit requirement of the panel itself or just a workaround for >for a PLL limitation on a particular GPU? For example, due to hw design and >electrical characteristics, certain divider combinations may not be viable on >certain asics. If that's the case, shouldn't this be handled in an asic >specific manor? If it's a requirement of the panel itself, ignore me and >carry on. > >Alex >
This is a special requirement that panel's tcon ask a particular value of N divider. Tcon needs this value for internal configuration. >> >> Cc: Jani Nikula <jani.nik...@intel.com> >> Cc: Cooper Chiou <cooper.ch...@intel.com> >> Cc: Matt Atwood <matthew.s.atw...@intel.com> >> Cc: Maarten Lankhorst <maarten.lankho...@linux.intel.com> >> Cc: Dhinakaran Pandiyan <dhinakaran.pandi...@intel.com> >> Cc: Clint Taylor <clinton.a.tay...@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(-) >> >> -- >> 2.7.4 >> >> _______________________________________________ >> dri-devel mailing list >> dri-devel@lists.freedesktop.org >> https://lists.freedesktop.org/mailman/listinfo/dri-devel _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel
