LSPCON is essencially a dp++->hdmi adaptor with dual mode of operation. These modes are: - Level Shifter mode: In LS mode, this device works as a type2 dp->hdmi ===================== passive dongle, which steps up DP++ output to appropriate HDMI 1.4 signal. This mode doesn't do any conversion at the protocol level. - Protocol Converter mode: In PCON mode, this device acts as a ========================== active DP++->HDMI 2.0 dongle, which converts the DP++ output to compatible HDMI 2.0 output. In PCON mode, lspcon can support 4k@60 outputs, using DP HBR2 mode. Many of Intel GEN9 devices come with in-built lspcon card in motherboartd down mode. This patch series adds support for lspcon devices in I915 driver. While unit-testing this code, I was able to see a 4k@60 modeset with: - BXT-T board - Single HDMI 4k@60 display (ACER S) - Ubuntu 14.04 desktop This patch set is a re-spin of old lspcon patch series, with following design changes / review comments addressed. Ville: 1. Use DRM_DP_DUAL_MODE APIs for core lspcon probing, as its a dp->hdmi adaptor only. 2. Move lspcon detection code in drm_dp_dual_mode_helper layer, instead of keeping it in i915 layer. Paulo: 1. Do not create a separate connector for lspcon, re-use the existing ddi layer, with special detection sequence (Mutually agreed by Daniel) Shashank Sharma (5): drm: Helper for LSPCON in drm_dp_dual_mode drm/i915: Add lspcon support for I915 driver drm/i915: lspcon detection drm/i915: Parse VBT data for lspcon drm/i915: Enable lspcon initialization drivers/gpu/drm/drm_dp_dual_mode_helper.c | 85 +++++++++++++++ drivers/gpu/drm/i915/Makefile | 1 + drivers/gpu/drm/i915/i915_drv.h | 3 + drivers/gpu/drm/i915/intel_bios.c | 44 ++++++++ drivers/gpu/drm/i915/intel_ddi.c | 50 ++++++++- drivers/gpu/drm/i915/intel_dp.c | 12 +++ drivers/gpu/drm/i915/intel_drv.h | 17 +++ drivers/gpu/drm/i915/intel_hdmi.c | 31 +++++- drivers/gpu/drm/i915/intel_lspcon.c | 165 ++++++++++++++++++++++++++++++ include/drm/drm_dp_dual_mode_helper.h | 29 ++++++ 10 files changed, 431 insertions(+), 6 deletions(-) create mode 100644 drivers/gpu/drm/i915/intel_lspcon.c -- 1.9.1 _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
