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From:   Rob Herring <robh@kernel.org>
Date:   Thu, 7 Mar 2019 17:13:11 -0600
Message-ID: <CAL_JsqLa1QNYTo+Yj-5fC4k8C1bd+V8qi5LiHgLA_qZY+Gy5cg@mail.gmail.com>
Subject: Re: [PATCH v2 1/8] drm/bridge: dw-hdmi: Add SCDC and TMDS Scrambling support
To:     Neil Armstrong <narmstrong@baylibre.com>
Cc:     Andrzej Hajda <a.hajda@samsung.com>,
        Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
        Philipp Zabel <p.zabel@pengutronix.de>,
        Sandy Huang <hjc@rock-chips.com>,
        "heiko@sntech.de" <heiko@sntech.de>,
        Maxime Ripard <maxime.ripard@bootlin.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        dri-devel <dri-devel@lists.freedesktop.org>,
        Nickey Yang <nickey.yang@rock-chips.com>,
        linux-amlogic@lists.infradead.org, Huicong Xu <xhc@rock-chips.com>
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On Fri, Feb 1, 2019 at 6:08 AM Neil Armstrong <narmstrong@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@60/50 modes.
>
> These changes were based on work done by Huicong Xu <xhc@rock-chips.com>
> and Nickey Yang <nickey.yang@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@rock-chips.com>
> Cc: Huicong Xu <xhc@rock-chips.com>
> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
> Tested-by: Heiko Stuebner <heiko@sntech.de>
> Reviewed-by: Andrzej Hajda <a.hajda@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