This patchset aims to add support for the following HDMI2.0 4k60 modes: - 594Mhz TMDS frequency needing TMDS Scramling and 1/40 rate for RGB/YUV4:4:4 - 297MHz TMDS frequency with YUV4:2:0 encoding
The first mode uses the SCDC helpers introduced by intel to : - discover where the monitor support SCDC - setup the SCDC parameters This is implemented in the dw-hdmi bridge driver by handling scrambling support during the bridge setup and by exporting an helper for the PHY setup to setup the SCDC configuration for the 1/40 TMDS rate. This code will only be active if the encoder support a TMDS rate > 340MHz.
This patch could eventually break support on different SoC when connected on a 4k60 monitor with SCDC : - i.MX correctly discards pixel clocks > 216MHz - R-CAR discards discards pixel clocks > 297MHz since [1] - Rockchip discards invalid pixel clocks not in the rockchip_mpll_cfg table - sun8i correctly discards pixel clocks > 297MHz on a83t - sun8i discards discards pixel clocks > 594Mhz on h6, which is already broken
First patch should fix support for Allwinner H6.
The second mode is implemented by added the missing 4:2:0 bypass handling in the dw-hdmi bridge driver and adding a "mtmdsclock" separating the pixel clock from the tmds clock in the mode setup phase. We also enable support for these modes in the connector only if the platform glue code explicits the support.
Only the meson DRM dw_hdmi glue allows ycbcr420 modes, so no breakage is expected here.
The remaining patches adds support for : - 1/40 TMDS rate aka DIV40 in the dw-hdmi meson PHY setup - 4:2:0 output and clock setup
The dw-hdmi support re-uses the support done by Rockchip engineers on the Linux 4.4 BSP kernel.
These modes has been validated using a MuxLab HDMI Signal Analyser in addition to different UHD TVs supporting full 4k60 or the 4:2:0 variant.
Changes since RFC v2 at [3]: - Collected tested-by and reviewed-by tags - Changed if condition in "add HDMI div40 TMDS mode" - Updated "Add YUV420 output support" with the same if condition
Changes since RFC v1 at [2]: - Fix all comments from Laurent : - Add define for HDMI 1.4 max tmds clock and SCDC supported version - Call dw_hdmi_set_high_tmds_clock_ratio() in dw_hdmi_phy_enable_powerdown() to unbreak Allwinner H6 - Pass in_t(u8, bytes, SCDC_MIN_SOURCE_VERSION) as SCDC version - Finally add comments for SCDC and Scrambling process
[1] https://patchwork.freedesktop.org/patch/263616/ [2] https://patchwork.freedesktop.org/series/52950/#rev1 [3] https://patchwork.freedesktop.org/series/52950/#rev2
Neil Armstrong (7): drm/bridge: dw-hdmi: Add SCDC and TMDS Scrambling support drm/meson: add HDMI div40 TMDS mode drm/meson: add support for HDMI2.0 2160p modes drm/bridge: dw-hdmi: add support for YUV420 output drm/bridge: dw-hdmi: allow ycbcr420 modes for >= 0x200a drm/meson: Add YUV420 output support drm/meson: Output in YUV444 if sink supports it
Zheng Yang (1): drm/bridge: dw-hdmi: support dynamically get input/out color info
drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 182 +++++++++++++++++++--- drivers/gpu/drm/bridge/synopsys/dw-hdmi.h | 1 + drivers/gpu/drm/meson/meson_dw_hdmi.c | 128 ++++++++++++--- drivers/gpu/drm/meson/meson_vclk.c | 93 ++++++++--- drivers/gpu/drm/meson/meson_vclk.h | 7 +- drivers/gpu/drm/meson/meson_venc.c | 8 +- drivers/gpu/drm/meson/meson_venc.h | 11 ++ drivers/gpu/drm/meson/meson_venc_cvbs.c | 3 +- include/drm/bridge/dw_hdmi.h | 7 + 9 files changed, 374 insertions(+), 66 deletions(-)