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

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Message-Id: <20250530-rk3588-dfi-improvements-v1-0-6e077c243a95@collabora.com>
Date: Fri, 30 May 2025 15:38:07 +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, 
 Nicolas Frattaroli <nicolas.frattaroli@...labora.com>
Subject: [PATCH 0/2] RK3588 rockchip-dfi enhancements

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,
-- 
Nicolas Frattaroli <nicolas.frattaroli@...labora.com>