linux-kernel - Re: [PATCH] clocksource/drivers/arm_arch_timer: Use event stream scaling when available

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Message-ID: <548c9794-12be-f5f0-0cd8-649df695afd9@linaro.org>
Date:   Tue, 1 Mar 2022 22:14:52 +0100
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Marc Zyngier <maz@...nel.org>, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Cc:     Thomas Gleixner <tglx@...utronix.de>, kernel-team@...roid.com,
        Mark Rutland <mark.rutland@....com>
Subject: Re: [PATCH] clocksource/drivers/arm_arch_timer: Use event stream
 scaling when available

On 03/02/2022 18:05, Marc Zyngier wrote:
> With FEAT_ECV and the 1GHz counter, it is pretty likely that the
> event stream divider doesn't fit in the field that holds the
> divider value (we only have 4 bits to describe counter bits [15:0]
> 
> Thankfully, FEAT_ECV also provides a scaling mechanism to switch
> the field to cover counter bits [23:8] instead.
> 
> Enable this on arm64 when ECV is available (32bit doesn't have
> any detection infrastructure and is unlikely to be run on an
> ARMv8.6 system anyway).
> 
> Signed-off-by: Marc Zyngier <maz@...nel.org>
> Cc: Mark Rutland <mark.rutland@....com>
> Cc: Daniel Lezcano <daniel.lezcano@...aro.org>
> ---

Applied, thanks


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