linux-kernel - Re: [PATCH v2] drivers/perf: hisi: Enable HiSilicon Erratum 162700402 quirk for HIP09

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Date: Mon,  4 Mar 2024 15:17:52 +0000
From: Will Deacon <will@...nel.org>
To: jonathan.cameron@...wei.com,
	Junhao He <hejunhao3@...wei.com>
Cc: catalin.marinas@....com,
	kernel-team@...roid.com,
	Will Deacon <will@...nel.org>,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linuxarm@...wei.com,
	yangyicong@...wei.com,
	prime.zeng@...ilicon.com
Subject: Re: [PATCH v2] drivers/perf: hisi: Enable HiSilicon Erratum 162700402 quirk for HIP09

On Tue, 27 Feb 2024 20:52:31 +0800, Junhao He wrote:
> HiSilicon UC PMU v2 suffers the erratum 162700402 that the PMU counter
> cannot be set due to the lack of clock under power saving mode. This will
> lead to error or inaccurate counts. The clock can be enabled by the PMU
> global enabling control.
> 
> This patch tries to fix this by set the UC PMU enable before set event
> period to turn on the clock, and then restore the UC PMU configuration.
> The counter register can hold its value without a clock.
> 
> [...]

Applied to will (for-next/perf), thanks!

[1/1] drivers/perf: hisi: Enable HiSilicon Erratum 162700402 quirk for HIP09
      https://git.kernel.org/will/c/e10b6976f6b9

Cheers,
-- 
Will

https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev