linux-kernel - Re: [PATCH v2 0/7] drm: sun4i: set proper TCON0 DCLK rate in DSI mode

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Message-Id: <CSCPKPC8OB80.1TTBCM3YDVJQ5@void.crly.cz>
Date:   Wed, 03 May 2023 16:22:32 +0200
From:   "Roman Beranek" <me@...y.cz>
To:     "Frank Oltmanns" <frank@...manns.dev>,
        "Maxime Ripard" <mripard@...nel.org>,
        "Jernej Skrabec" <jernej.skrabec@...il.com>
Cc:     "Chen-Yu Tsai" <wens@...e.org>, "David Airlie" <airlied@...il.com>,
        "Daniel Vetter" <daniel@...ll.ch>,
        "Samuel Holland" <samuel@...lland.org>,
        "Ondrej Jirman" <megi@....cz>, <dri-devel@...ts.freedesktop.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-sunxi@...ts.linux.dev>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 0/7] drm: sun4i: set proper TCON0 DCLK rate in DSI
 mode

Hello everyone,

I apologize for my absence from the discussion during past week, I got
hit with tonsillitis.

On Mon May 1, 2023 at 3:40 PM CEST, Frank Oltmanns wrote:
> Looking at ccu_nkm_determine_rate(), we've found our culprit because it
> does not try parent clock rates other than the current one. The same
> applies to all other ccu_nkm_* functions.

Yes, that's why I dropped CLK_SET_RATE_PARENT from pll-mipi in v3.

>  b. Add functionality to ccu_nkm_* to also update the parent clock rate.
>
> I'm actually interested in tackling b, but I can't make any promises as
> to if and when I'll be able to solve it. I'm not certain about any side
> effects this might have.

It sounds like an interesting exercise. But what if HDMI is then added
to the mix?

Best regards
Roman