From: Erico Nunes <nunes.erico@gmail.com>
To: Frank Oltmanns <frank@oltmanns.dev>
Cc: "Michael Turquette" <mturquette@baylibre.com>,
"Stephen Boyd" <sboyd@kernel.org>, "Chen-Yu Tsai" <wens@csie.org>,
"Jernej Skrabec" <jernej.skrabec@gmail.com>,
"Samuel Holland" <samuel@sholland.org>,
"Guido Günther" <agx@sigxcpu.org>,
"Purism Kernel Team" <kernel@puri.sm>,
"Ondrej Jirman" <megi@xff.cz>,
"Neil Armstrong" <neil.armstrong@linaro.org>,
"Jessica Zhang" <quic_jesszhan@quicinc.com>,
"Sam Ravnborg" <sam@ravnborg.org>,
"Maarten Lankhorst" <maarten.lankhorst@linux.intel.com>,
"Maxime Ripard" <mripard@kernel.org>,
"Thomas Zimmermann" <tzimmermann@suse.de>,
"David Airlie" <airlied@gmail.com>,
"Daniel Vetter" <daniel@ffwll.ch>,
"Rob Herring" <robh+dt@kernel.org>,
"Krzysztof Kozlowski" <krzysztof.kozlowski+dt@linaro.org>,
"Conor Dooley" <conor+dt@kernel.org>,
linux-clk@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-sunxi@lists.linux.dev, linux-kernel@vger.kernel.org,
dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org
Subject: Re: [PATCH v3 5/5] arm64: dts: allwinner: a64: Run GPU at 432 MHz
Date: Wed, 6 Mar 2024 16:04:47 +0100 [thread overview]
Message-ID: <CAK4VdL0zWRg4hzUbuZsnabU53x3DrOiemH0tGnpbK9ECQvM1qg@mail.gmail.com> (raw)
In-Reply-To: <20240304-pinephone-pll-fixes-v3-5-94ab828f269a@oltmanns.dev>
On Mon, Mar 4, 2024 at 6:01 PM Frank Oltmanns <frank@oltmanns.dev> wrote:
>
> The Allwinner A64's GPU has currently three operating points. However,
> the BSP runs the GPU fixed at 432 MHz. In addition, at least one of the
> devices using that SoC - the pinephone - shows unstabilities (see link)
> that can be circumvented by running the GPU at a fixed rate.
>
> Therefore, remove the other two operating points from the GPU OPP table,
> so that the GPU runs at a fixed rate of 432 MHz.
In addition to all of this, the A64 user manual does say explicitly
that "dynamic frequency scaling is not supported" on PLL_GPU. So I
think this is really needed for a reliable GPU experience on A64.
Acked-by: Erico Nunes <nunes.erico@gmail.com>
Thanks
Erico
prev parent reply other threads:[~2024-03-06 15:05 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-04 7:29 [PATCH v3 0/5] Pinephone video out fixes (flipping between two frames) Frank Oltmanns
2024-03-04 7:29 ` [PATCH v3 1/5] clk: sunxi-ng: common: Support minimum and maximum rate Frank Oltmanns
2024-03-04 10:06 ` Maxime Ripard
2024-03-04 7:29 ` [PATCH v3 2/5] clk: sunxi-ng: a64: Set minimum and maximum rate for PLL-MIPI Frank Oltmanns
2024-03-04 10:06 ` Maxime Ripard
2024-03-04 7:29 ` [PATCH v3 3/5] clk: sunxi-ng: nkm: Support constraints on m/n ratio and parent rate Frank Oltmanns
2024-03-04 7:29 ` [PATCH v3 4/5] clk: sunxi-ng: a64: Add constraints on PLL-MIPI's n/m " Frank Oltmanns
2024-03-04 7:29 ` [PATCH v3 5/5] arm64: dts: allwinner: a64: Run GPU at 432 MHz Frank Oltmanns
2024-03-06 15:04 ` Erico Nunes [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=CAK4VdL0zWRg4hzUbuZsnabU53x3DrOiemH0tGnpbK9ECQvM1qg@mail.gmail.com \
--to=nunes.erico@gmail.com \
--cc=agx@sigxcpu.org \
--cc=airlied@gmail.com \
--cc=conor+dt@kernel.org \
--cc=daniel@ffwll.ch \
--cc=devicetree@vger.kernel.org \
--cc=dri-devel@lists.freedesktop.org \
--cc=frank@oltmanns.dev \
--cc=jernej.skrabec@gmail.com \
--cc=kernel@puri.sm \
--cc=krzysztof.kozlowski+dt@linaro.org \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-clk@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-sunxi@lists.linux.dev \
--cc=maarten.lankhorst@linux.intel.com \
--cc=megi@xff.cz \
--cc=mripard@kernel.org \
--cc=mturquette@baylibre.com \
--cc=neil.armstrong@linaro.org \
--cc=quic_jesszhan@quicinc.com \
--cc=robh+dt@kernel.org \
--cc=sam@ravnborg.org \
--cc=samuel@sholland.org \
--cc=sboyd@kernel.org \
--cc=tzimmermann@suse.de \
--cc=wens@csie.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).