Prep work for DP branch device handling
This series of patches reads DPCD register 0x80h for receiver capabilities for DP branch devices. The branch device types are converters for the following standards
- DP to VGA - DP to DVI - DP to HDMI - DP++ dual mode - Wireless WiGig
DPCD register defines max pixel rate for VGA dongles. This check is carried out during mode validation.
What's new in the series: - Readout of branch device ID, HW, and SW revisions from DPCD register
v2: DPCD register read outs moved to drm (Ville, Daniel) v3: Max pixel rate computation moved to drm (Daniel) v4: Use of drm_dp_helper routines to collect data (Ville)
Mika Kahola (11): drm: Add missing DP downstream port types drm: Read DP downstream port capabilities drm: Helper to read DP branch device type drm: Helper to read max clock rate drm: Helper to read max bits per component drm: Read DP branch device id drm: Read DP branch device HW revision drm: Read DP branch device SW revision drm/i915: Check pixel rate for DP to VGA dongle drm/i915: Update bits per component for display info drm/i915: Add DP branch device info on debugfs
drivers/gpu/drm/drm_dp_helper.c | 155 ++++++++++++++++++++++++++++++++++++ drivers/gpu/drm/i915/i915_debugfs.c | 66 +++++++++++++++ drivers/gpu/drm/i915/intel_dp.c | 29 +++++++ include/drm/drm_dp_helper.h | 23 +++++- 4 files changed, 272 insertions(+), 1 deletion(-)