linux-kernel - Re: [PATCH 1/3] drm: bridge: synopsys/dw-hdmi: Enable cec clock

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Date:   Sat, 14 Oct 2017 15:21:17 +0200
From:   Pierre-Hugues Husson <phh@....me>
To:     Fabio Estevam <festevam@...il.com>
Cc:     linux-rockchip@...ts.infradead.org,
        linux-media <linux-media@...r.kernel.org>,
        Heiko Stübner <heiko@...ech.de>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] drm: bridge: synopsys/dw-hdmi: Enable cec clock

Hi Fabio,

2017-10-14 2:18 GMT+02:00 Fabio Estevam <festevam@...il.com>:
> Hi Pierre-Hugues,
>
> On Fri, Oct 13, 2017 at 7:53 PM, Pierre-Hugues Husson <phh@....me> wrote:
>> The documentation already mentions "cec" optional clock, but
>> currently the driver doesn't enable it.
>
> The cec clock is enabled at dw_hdmi_cec_enable().
As far as I understand, dw_hdmi_cec_enable only gates
the CEC clock inside the Synopsis IP,
but the SOC still has to provide a specific CEC clock to it.
To enable such an external CEC clock, the binding documentation [1]
mentions a "cec" optional clock, and I'm not seeing any code in dw-hdmi
to enable it.

Regards,

[1] On next-20170929
Documentation/devicetree/bindings/display/bridge/dw_hdmi.txt line 28