[PATCH v2 1/8] drm/bridge: dw-hdmi: Add SCDC and TMDS Scrambling support

[Rob Herring]

On Fri, Feb 1, 2019 at 6:08 AM Neil Armstrong <narmstrong at baylibre.com> wrote:
>
> Add support for SCDC Setup for TMDS Clock > 3.4GHz and enable TMDS
> Scrambling when supported or mandatory.
>
> This patch also adds an helper to setup the control bit to support
> the high TMDS Bit Period/TMDS Clock-Period Ratio as required with
> TMDS Clock > 3.4GHz for HDMI2.0 3840x2160 at 60/50 modes.
>
> These changes were based on work done by Huicong Xu <xhc at rock-chips.com>
> and Nickey Yang <nickey.yang at rock-chips.com> to support HDMI2.0 modes
> on the Rockchip 4.4 BSP kernel at [1]
>
> [1] https://github.com/rockchip-linux/kernel/tree/release-4.4
>
> Cc: Nickey Yang <nickey.yang at rock-chips.com>
> Cc: Huicong Xu <xhc at rock-chips.com>
> Signed-off-by: Neil Armstrong <narmstrong at baylibre.com>
> Tested-by: Heiko Stuebner <heiko at sntech.de>
> Reviewed-by: Andrzej Hajda <a.hajda at samsung.com>
> ---
>  drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 85 ++++++++++++++++++++++++++++++-
>  drivers/gpu/drm/bridge/synopsys/dw-hdmi.h |  1 +
>  include/drm/bridge/dw_hdmi.h              |  1 +
>  3 files changed, 85 insertions(+), 2 deletions(-)

This commit in drm-misc-next is breaking booting on the Rock960. I
have FB and fbcon enabled. The boot hangs after this message:

[    3.012334] [drm:rockchip_drm_fbdev_create] FB [1920x1080]-24
kvaddr=(____ptrval____) offset=0 size=8294400

Rob