linux-kernel - Re: [PATCH v1 RESEND 2/2] drm/panfrost: Add basic support for speed binning

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Message-ID: <20230331114617.6932e609@collabora.com>
Date:   Fri, 31 Mar 2023 11:46:17 +0200
From:   Boris Brezillon <boris.brezillon@...labora.com>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Cc:     airlied@...il.com, daniel@...ll.ch, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, wenst@...omium.org,
        steven.price@....com, alyssa.rosenzweig@...labora.com,
        robh@...nel.org, dri-devel@...ts.freedesktop.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel@...labora.com
Subject: Re: [PATCH v1 RESEND 2/2] drm/panfrost: Add basic support for speed
 binning

On Fri, 31 Mar 2023 10:11:07 +0200
AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
wrote:

> Il 23/03/23 10:08, AngeloGioacchino Del Regno ha scritto:
> > Some SoCs implementing ARM Mali GPUs are subject to speed binning:
> > this means that some versions of the same SoC model may need to be
> > limited to a slower frequency compared to the other:
> > this is being addressed by reading nvmem (usually, an eFuse array)
> > containing a number that identifies the speed binning of the chip,
> > which is usually related to silicon quality.
> > 
> > To address such situation, add basic support for reading the
> > speed-bin through nvmem, as to make it possible to specify the
> > supported hardware in the OPP table for GPUs.
> > This commit also keeps compatibility with any platform that does
> > not specify (and does not even support) speed-binning.
> > 
> > Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>  
> 
> Hello maintainers,
> I've seen that this got archived in the dri-devel patchwork; because of that and
> only that, I'm sending this ping to get this patch reviewed.

Series queued to drm-misc-next.