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

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Message-ID: <CAL_JsqLw9t0GJ4dDu6DgW4_Vwy3LzX_uCUJYXCN5rD-WUNEHTA@mail.gmail.com>
Date:   Fri, 7 Aug 2020 13:47:10 -0600
From:   Rob Herring <robh@...nel.org>
To:     Tomeu Vizoso <tomeu.vizoso@...labora.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Steven Price <steven.price@....com>,
        Alyssa Rosenzweig <alyssa.rosenzweig@...labora.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel <dri-devel@...ts.freedesktop.org>
Subject: Re: [PATCH 1/2] panfrost: Make sure GPU is powered on when reading GPU_LATEST_FLUSH_ID

On Thu, Jun 11, 2020 at 2:59 AM Tomeu Vizoso <tomeu.vizoso@...labora.com> wrote:
>
> 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>
> ---
>  drivers/gpu/drm/panfrost/panfrost_gpu.c | 14 ++++++++++++--
>  1 file changed, 12 insertions(+), 2 deletions(-)

Both patches applied.