linux-kernel - Re: [PATCH v3 015/105] drm/vc4: hvs: Boost the core clock during modeset

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Message-ID: <CADaigPWQdeTd2CGCK-yxq+TAU6xKMVsdZfhSVptn4RSENxpdxg@mail.gmail.com>
Date:   Wed, 27 May 2020 09:33:44 -0700
From:   Eric Anholt <eric@...olt.net>
To:     Maxime Ripard <maxime@...no.tech>
Cc:     Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        DRI Development <dri-devel@...ts.freedesktop.org>,
        linux-rpi-kernel@...ts.infradead.org,
        bcm-kernel-feedback-list@...adcom.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Dave Stevenson <dave.stevenson@...pberrypi.com>,
        Tim Gover <tim.gover@...pberrypi.com>,
        Phil Elwell <phil@...pberrypi.com>
Subject: Re: [PATCH v3 015/105] drm/vc4: hvs: Boost the core clock during modeset

On Wed, May 27, 2020 at 8:49 AM Maxime Ripard <maxime@...no.tech> wrote:
>
> In order to prevent timeouts and stalls in the pipeline, the core clock
> needs to be maxed at 500MHz during a modeset on the BCM2711.

Like, the whole system's core clock?  How is it reasonable for some
device driver to crank the system's core clock up and back down to
some fixed-in-the-driver frequency?  Sounds like you need some sort of
opp thing here.

Patch 13,14 r-b.