linux-kernel - Re: [PATCH 7/8] arm64: tegra: Update AHUB clock parent and rate on Tegra234

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Date:   Thu, 22 Jun 2023 13:13:23 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Sameer Pujar <spujar@...dia.com>
Cc:     robh+dt@...nel.org, krzk+dt@...nel.org, thierry.reding@...il.com,
        lgirdwood@...il.com, perex@...ex.cz, tiwai@...e.com,
        jonathanh@...dia.com, mkumard@...dia.com, sheetal@...dia.com,
        alsa-devel@...a-project.org, devicetree@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH 7/8] arm64: tegra: Update AHUB clock parent and rate on
 Tegra234

On Thu, Jun 22, 2023 at 05:04:15PM +0530, Sameer Pujar wrote:
> From: Sheetal <sheetal@...dia.com>
> 
> I2S data sanity tests fail beyond a bit clock frequency of 6.144MHz.
> This happens because the AHUB clock rate is too low and it shows
> 9.83MHz on boot.
> 
> The maximum rate of PLLA_OUT0 is 49.152MHz and is used to serve I/O
> clocks. It is recommended that AHUB clock operates higher than this.
> Thus fix this by using PLLP_OUT0 as parent clock for AHUB instead of
> PLLA_OUT0 and fix the rate to 81.6MHz.
> 
> Fixes: dc94a94daa39 ("arm64: tegra: Add audio devices on Tegra234")
> Cc: stable@...r.kernel.org
> Signed-off-by: Sheetal <sheetal@...dia.com>

Fixes should come before cleanups in a patch series to ensure that they
can be applied and sent as fixes without dependencies on non-fixes.

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