linux-kernel - [RFC PATCH 0/2] rockchip / devfreq: Coordinate DRAM controller resources between ATF and kernel

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Date:   Tue,  5 Apr 2022 18:48:40 -0700
From:   Brian Norris <briannorris@...omium.org>
To:     MyungJoo Ham <myungjoo.ham@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Heiko Stuebner <heiko@...ech.de>
Cc:     linux-kernel@...r.kernel.org,
        Elaine Zhang <zhangqing@...k-chips.com>,
        linux-pm@...r.kernel.org, Doug Anderson <dianders@...omium.org>,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org,
        Brian Norris <briannorris@...omium.org>
Subject: [RFC PATCH 0/2] rockchip / devfreq: Coordinate DRAM controller resources between ATF and kernel

On Rockchip RK3399, there are a few hardware resources that are shared
between firmware (ARM Trusted Firmware) and kernel (power domain
driver) that need to be coordinated properly for DRAM DVFS to work
reliably. See patch 1 for plenty more description.

These fixes are based in part on the specification in the RK3399, and in
part based on extrapolation and observation. Any confirmation about the
behavior of PMU_CRU_GATEDIS_CON0, etc., is welcome.

Otherwise, see the patches.

Regards,
Brian


Brian Norris (2):
  soc: rockchip: power-domain: Manage resource conflicts with firmware
  PM / devfreq: rk3399_dmc: Block PMU during transitions

 drivers/devfreq/rk3399_dmc.c      |  13 ++++
 drivers/soc/rockchip/pm_domains.c | 118 ++++++++++++++++++++++++++++++
 include/soc/rockchip/pm_domains.h |  25 +++++++
 3 files changed, 156 insertions(+)
 create mode 100644 include/soc/rockchip/pm_domains.h

-- 
2.35.1.1094.g7c7d902a7c-goog