linux-kernel - Re: [PATCH 1/2] panfrost: Make sure GPU is powered on when reading GPU_LATEST_FLUSH

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Message-ID: <4351778.0rgn4tIXvQ@phil>
Date:   Thu, 11 Jun 2020 11:05:37 +0200
From:   Heiko Stuebner <heiko@...ech.de>
To:     dri-devel@...ts.freedesktop.org
Cc:     Tomeu Vizoso <tomeu.vizoso@...labora.com>,
        LKML <linux-kernel@...r.kernel.org>,
        David Airlie <airlied@...ux.ie>,
        Steven Price <steven.price@....com>,
        Alyssa Rosenzweig <alyssa.rosenzweig@...labora.com>
Subject: Re: [PATCH 1/2] panfrost: Make sure GPU is powered on when reading GPU_LATEST_FLUSH_ID

Am Donnerstag, 11. Juni 2020, 10:58:43 CEST schrieb Tomeu Vizoso:
> Bifrost devices do support the flush reduction feature, so on first job
> submit we were trying to read the register while still powered off.
> 
> If the GPU is powered off, the feature doesn't bring any benefit, so
> don't try to read.
> 
> Signed-off-by: Tomeu Vizoso <tomeu.vizoso@...labora.com>

on a PX30-board (sibling of rk3326) with a 720x1280 panel and
glmark2 running all tests

Tested-by: Heiko Stuebner <heiko@...ech.de>