mirror of https://lore.kernel.org/lkml/
 help / color / mirror / Atom feed
From: Chukun Pan <amadeus@jmu.edu.cn>
To: alchark@gmail.com
Cc: amadeus@jmu.edu.cn, conor+dt@kernel.org,
	devicetree@vger.kernel.org, heiko@sntech.de, jonas@kwiboo.se,
	krzk+dt@kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, linux-rockchip@lists.infradead.org,
	ziyao@disroot.org
Subject: Re: [PATCH v2 1/1] arm64: dts: rockchip: rk3528: Add CPU frequency scaling support
Date: Sun, 20 Jul 2025 22:00:10 +0800	[thread overview]
Message-ID: <20250720140010.218235-1-amadeus@jmu.edu.cn> (raw)
In-Reply-To: <CABjd4YzLaAgd-5Cg9fMSAgCS6Wt6=uC8K3WRhcAtnjjg1je87Q@mail.gmail.com>

Hi,

> > Because the actual frequency generated by 850mV is closer to 1008MHz.
>
> Which likely means that you have an -L5 chip. It will be different on
> other chips - it's a lottery of silicon quality.

The rk3528 board I have has -L3 and -L5 levels.
-L3 level tested at 850mV (mainline kernel) actual frequency is 1055MHz.

Frankly speaking, I have always doubted whether the voltage value of BSP
is correct. The voltage of BSP kernel at 1800MHz and 2016MHz is too low,
and no board can reach the corresponding actual frequency.
For example, if we set the CPU frequency to 2016MHz when running the BSP
kernel, the actual frequency can only reach 1800MHz.

Thanks,
Chukun

--
2.25.1


  reply	other threads:[~2025-07-20 14:00 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-06-20 10:00 [PATCH v2 0/1] " Chukun Pan
2025-06-20 10:00 ` [PATCH v2 1/1] " Chukun Pan
2025-07-10 11:45   ` Heiko Stuebner
2025-07-10 12:11     ` Jonas Karlman
2025-07-10 15:59       ` Alexey Charkov
2025-07-16 14:30         ` Chukun Pan
2025-07-16 15:48           ` Alexey Charkov
2025-07-17  7:00       ` Chukun Pan
2025-07-17  8:46         ` Alexey Charkov
2025-07-18 14:01           ` Chukun Pan
2025-07-18 15:03             ` Alexey Charkov
2025-07-20 14:00               ` Chukun Pan [this message]
2025-07-27 17:09                 ` Willy Tarreau
2025-07-30  7:00                   ` Chukun Pan
2025-07-30  7:11                     ` Willy Tarreau
2025-07-30 13:20                       ` Chukun Pan
2025-07-30 13:33                         ` Willy Tarreau

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=20250720140010.218235-1-amadeus@jmu.edu.cn \
    --to=amadeus@jmu.edu.cn \
    --cc=alchark@gmail.com \
    --cc=conor+dt@kernel.org \
    --cc=devicetree@vger.kernel.org \
    --cc=heiko@sntech.de \
    --cc=jonas@kwiboo.se \
    --cc=krzk+dt@kernel.org \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-rockchip@lists.infradead.org \
    --cc=ziyao@disroot.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
all inboxes | Powered by JetHome®