linux-kernel - Re: [PATCH] clk: sunxi-ng: v3s: add support for variable rate audio pll output

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Thu, 18 Feb 2021 08:58:35 +0100
From:   Maxime Ripard <maxime@...no.tech>
To:     Tobias Schramm <t.schramm@...jaro.org>
Cc:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Icenowy Zheng <icenowy@...c.io>, Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] clk: sunxi-ng: v3s: add support for variable rate audio
 pll output

Hi,

On Fri, Feb 12, 2021 at 02:57:25PM +0100, Tobias Schramm wrote:
> Previously the variable rate audio pll output was fixed to a divider of
> four. This is unfortunately incompatible with generating commonly used
> I2S core clock rates like 24.576MHz from the 24MHz parent clock.
> This commit adds support for arbitrary audio pll output dividers to fix
> that.
> 
> Signed-off-by: Tobias Schramm <t.schramm@...jaro.org>

It's not really clear to me how that would help.

The closest frequency we can provide for 24.576MHz would be 24580645 Hz,
with N = 127, M = 31 and P = 4, so it would work with what we have
already?

Maxime

Download attachment "signature.asc" of type "application/pgp-signature" (229 bytes)