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

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Date:   Fri, 8 Mar 2019 09:05:35 +0100
From:   Neil Armstrong <narmstrong@...libre.com>
To:     Rob Herring <robh@...nel.org>
Cc:     Andrzej Hajda <a.hajda@...sung.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Sandy Huang <hjc@...k-chips.com>,
        "heiko@...ech.de" <heiko@...ech.de>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Nickey Yang <nickey.yang@...k-chips.com>,
        linux-amlogic@...ts.infradead.org, Huicong Xu <xhc@...k-chips.com>
Subject: Re: [PATCH v2 1/8] drm/bridge: dw-hdmi: Add SCDC and TMDS Scrambling
 support

Hi Rob,

On 08/03/2019 00:13, Rob Herring wrote:
> On Fri, Feb 1, 2019 at 6:08 AM Neil Armstrong <narmstrong@...libre.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@...50 modes.
>>
>> These changes were based on work done by Huicong Xu <xhc@...k-chips.com>
>> and Nickey Yang <nickey.yang@...k-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@...k-chips.com>
>> Cc: Huicong Xu <xhc@...k-chips.com>
>> Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
>> Tested-by: Heiko Stuebner <heiko@...ech.de>
>> Reviewed-by: Andrzej Hajda <a.hajda@...sung.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

Could you give more details on the tree used ? did you bisect to find this commit ?

Neil

> 
> Rob
>