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

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Date:   Sat, 14 Oct 2017 10:41:20 -0300
From:   Fabio Estevam <festevam@...il.com>
To:     Pierre-Hugues Husson <phh@....me>
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 Pierre,

On Sat, Oct 14, 2017 at 10:21 AM, Pierre-Hugues Husson <phh@....me> wrote:

> 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.

Ok, understood.

In the case of i.MX6 we control the CEC clock via
HDMI_MC_CLKDIS_CECCLK_DISABLE bit inside the Synopsis IP.

Looks like Rockchip needs the external CEC clock then.

Regards,

Fabio Estevam