linux-kernel - Re: [PATCH 0/2] RK3588 rockchip-dfi enhancements

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Message-ID: <2422670.VLH7GnMWUR@workhorse>
Date: Fri, 20 Jun 2025 18:08:53 +0200
From: Nicolas Frattaroli <nicolas.frattaroli@...labora.com>
To: Chanwoo Choi <cw00.choi@...sung.com>,
 MyungJoo Ham <myungjoo.ham@...sung.com>,
 Kyungmin Park <kyungmin.park@...sung.com>, Heiko Stuebner <heiko@...ech.de>,
 Sascha Hauer <s.hauer@...gutronix.de>,
 Jonathan Cameron <Jonathan.Cameron@...wei.com>,
 Sebastian Reichel <sebastian.reichel@...labora.com>
Cc: kernel@...labora.com, linux-pm@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-rockchip@...ts.infradead.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] RK3588 rockchip-dfi enhancements

On Friday, 30 May 2025 15:38:07 Central European Summer Time Nicolas Frattaroli wrote:
> This series consists of two related patches. The first fixes the memory
> cycle counter on RK3588, which read half of what it should've been
> reading. You can easily verify this with
> 
>   perf stat -a -e rockchip_ddr/cycles/ sleep 1
> 
> and then dividing the result by the number of Hertz the ddr init settles
> on, which for LPDDR4X on RK3588 appears to be 2112MHz.
> 
> The second adds support for measuring memory bandwidth with LPDDR5
> memory. Results have been validated by comparing its reported bandwidth
> with that reported by stress-ng --stream 8 --timeout 15, which line up
> almost perfectly.
> 
> Signed-off-by: Nicolas Frattaroli <nicolas.frattaroli@...labora.com>
> ---
> Nicolas Frattaroli (2):
>       PM / devfreq: rockchip-dfi: double count on RK3588
>       PM / devfreq: rockchip-dfi: add support for LPDDR5
> 
>  drivers/devfreq/event/rockchip-dfi.c | 91 ++++++++++++++++++++++++++++--------
>  include/soc/rockchip/rk3588_grf.h    |  8 +++-
>  include/soc/rockchip/rockchip_grf.h  |  1 +
>  3 files changed, 79 insertions(+), 21 deletions(-)
> ---
> base-commit: ba2b2250bbaf005016ba85e345add6e19116a1ea
> change-id: 20250530-rk3588-dfi-improvements-f646424715d2
> 
> Best regards,
> 

I see someone has merged patch 1 into -next without leaving a message,
but patch 2 was not picked.

Could this mysterious patron saint of PM / devfreq make themselves
heard and let me know whether they would like to see a second revision
of patch 2, and if so, what said revision should address?

I am asking specifically as I would like to continue working on the
driver in a follow-up series, and BYEWORD_UPDATE already complicates
the situation by being another in-flight patch.

Kind regards,
Nicolas Frattaroli