The Amlogic GX SoCs implements a Synopsys DesignWare HDMI TX Controller in combination with a very custom PHY.
Thanks to Laurent Pinchart's changes, the HW report the following : Detected HDMI TX controller v2.01a with HDCP (Vendor PHY)
The following differs from common PHY integration as managed in the current driver : - Amlogic PHY is not configured through the internal I2C link - Amlogic PHY do not use the ENTMDS, SVSRET, PDDQ, ... signals from the controller - Amlogic PHY do not export HPD ands RxSense signals to the controller
And finally, concerning the controller integration : - the Controller registers are not flat memory-mapped, and uses an addr+read/write register pair to write all registers. - Inputs only YUV444 pixel data
Most of these uses case are implemented in Laurent Pinchart v4 patchset at [3] : - Conversion to regmap for register access - Add more callbacks ops to handle Custom PHYs - Fixes a bug that considers the input to be always RBG and sends bad pixel format to a DVI sink by disabling CSC
This is why the following patchset implements : - Configure the Input format from the plat_data - Add PHY callback to handle HPD and RxSens out of the dw-hdmi drive
This patchset makes the Amlogix GX SoCs HDMI output successfully work, and is also tested on the RK3288 ACT8846 EVB Board.
Changes since v1 at [2] :
Changes since RFC at [1] : - Regmap fixup for 4bytes register access, tested on RK3288 SoC - Move phy callbacks to phy_ops and move Synopsys PHY calls into default ops - Move HDMI link data into shared header - Move Pixel Encoding enum to shared header
[1] http://lkml.kernel.org/r/1484656294-6140-1-git-send-email-narmstrong@baylibr... [2] http://lkml.kernel.org/r/1485774318-21916-1-git-send-email-narmstrong@baylib... [3] http://lkml.kernel.org/r/20170301223915.29888-1-laurent.pinchart+renesas@ide...
Neil Armstrong (2): drm: bridge: dw-hdmi: Take input format from plat_data drm: bridge: Move HPD handling to PHY operations
drivers/gpu/drm/bridge/dw-hdmi.c | 193 +++++++++++++++++++++++++-------------- include/drm/bridge/dw_hdmi.h | 17 ++++ 2 files changed, 143 insertions(+), 67 deletions(-)