linux-kernel - Re: [PATCH] spi: cadence-quadspi: Fix clock enable underflows due to runtime PM

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Message-ID: <555e9f6b-b8b6-4cc5-900b-63aaff8b4e6c@sirena.org.uk>
Date: Thu, 4 Dec 2025 13:28:01 +0000
From: Mark Brown <broonie@...nel.org>
To: Francesco Dolcini <francesco@...cini.it>
Cc: Siddharth Vadapalli <s-vadapalli@...com>, Anurag Dutta <a-dutta@...com>,
	linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Subject: Re: [PATCH] spi: cadence-quadspi: Fix clock enable underflows due to
 runtime PM

On Thu, Dec 04, 2025 at 10:13:35AM +0100, Francesco Dolcini wrote:

> Unless I did some stupid mistake testing the patch, it does not fix the issue.
> Here the log with v6.18 + this patch

Yeah, I'm pretty sure it didn't work.  I've managed to find a system
which instantiates the IP so hopefully I can modify it to trigger the
issue and test directly rather than working blind, I've also noticed
that we're getting

[   15.430306] cadence-qspi 13010000.spi: Runtime PM usage count underflow!

even in normal operation (on that system anyway) so the runtime PM
handling is definitely unhappy.

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