linux-kernel - Re: [PATCH] drm/bridge: synopsys/dw-hdmi: set cec clock rate

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Date:   Sun, 13 Mar 2022 17:14:49 +0100
From:   Piotr Oniszczuk <piotr.oniszczuk@...il.com>
To:     Peter Geis <pgwipeout@...il.com>
Cc:     Andrzej Hajda <andrzej.hajda@...el.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Robert Foss <robert.foss@...aro.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Pierre-Hugues Husson <phh@....me>,
        Archit Taneja <architt@...eaurora.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Robin Murphy <robin.murphy@....com>,
        "open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
        Heiko Stübner <heiko@...ech.de>,
        dri-devel@...ts.freedesktop.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/bridge: synopsys/dw-hdmi: set cec clock rate



> Wiadomość napisana przez Peter Geis <pgwipeout@...il.com> w dniu 13.03.2022, o godz. 13:56:
> 
>> 
> 
> I was worried about that, thanks for testing it.
> Can you send me the cec_clk rate before and after this patch?
> 

Here it is:

working:
                                 enable  prepare  protect                                duty  hardware
   clock                          count    count    count        rate   accuracy phase  cycle    enable
-------------------------------------------------------------------------------------------------------
clk_hdmi_cec                      1        2        0       32743          0     0  50000         Y



non-working:
                                 enable  prepare  protect                                duty  hardware
   clock                          count    count    count        rate   accuracy phase  cycle    enable
-------------------------------------------------------------------------------------------------------
clk_hdmi_cec                      1        2        0       32768          0     0  50000         Y



dmesg
[   52.745988] cec-dw_hdmi: message 44 timed out
[   54.879307] cec-dw_hdmi: message 44 timed out
[   57.012654] cec-dw_hdmi: message 88 timed out
[   59.145973] cec-dw_hdmi: message 88 timed out



player:
2022-03-13 11:04:40.938355 E CECAdapter: CLinuxCECAdapterCommunication::Write - ioctl CEC_TRANSMIT failed - tx_status=00 errno=22
2022-03-13 11:04:40.938366 E CECAdapter: CLinuxCECAdapterCommunication::Write - ioctl CEC_TRANSMIT failed - tx_status=00 errno=22