Dear all,
The rk3399 platform has a DFI controller that can monitor DDR load and a
DMC driver that talks with the TF-A (Trusted Firmware-A) to dynamically
set the DDR frequency with following flow.
kernel Trusted Firmware-A
(bl31)
monitor ddr load
|
|
get_target_rate
|
| pass rate to TF-A
clk_set_rate(ddr) --------------------->run ddr dvs flow
|
|
<------------------------------end ddr dvs flow
|
|
return
These patches add support for devfreq to dynamically control the DDR
frequency into the drm rockchip driver. By default it uses the
'simple_ondemand' governor which can adjust the frequency based on the
DDR load.
Although the patches were present in the chromeos kernel for long time I
am sending this as a RFC because I have doubts on some of them,
specially patch 4/10 that tries to sync the TF-A with the kernel using a
mutex, to be honest I did not find another way to do it so feedback is
more than welcome.
The patches apply on top of current 4.17-rc5 and depends on the
following series to apply cleanly.
1. https://lkml.org/lkml/2018/5/9/464
2. https://lkml.org/lkml/2018/4/23/354
Waiting for your feedback.
Best regards,
Enric
Derek Basehore (3):
devfreq: rk3399_dmc / clk: rockchip: Sync with vblank in the kernel
for DDRfreq.
devfreq: rk3399_dmc / clk: rockchip: Disable DDR clk timeout on
suspend.
clk: rockchip: set clk-ddr to GET_RATE_NOCACHE.
Enric Balletbo i Serra (3):
devfreq: rockchip-dfi: Move GRF definitions to a common place.
dt-bindings: devfreq: rk3399_dmc: Add rockchip,pmu phandle.
devfreq: rk3399_dmc: Pass ODT and auto power down parameters to TF-A.
Lin Huang (3):
devfreq: rk3399_dmc / rockchip: pm_domains: Register notify to DMC
driver.
arm64: dts: rk3399: Add dfi and dmc nodes.
arm64: dts: rockchip: Enable dmc and dfi nodes on gru.
Sean Paul (1):
drm: rockchip: Add DDR devfreq support.
.../bindings/devfreq/rk3399_dmc.txt | 2 +
.../rockchip/rk3399-dram-default-timing.dtsi | 38 ++++
arch/arm64/boot/dts/rockchip/rk3399-dram.h | 73 +++++++
arch/arm64/boot/dts/rockchip/rk3399-gru.dtsi | 21 ++
.../boot/dts/rockchip/rk3399-op1-opp.dtsi | 29 +++
arch/arm64/boot/dts/rockchip/rk3399.dtsi | 22 +-
drivers/clk/rockchip/clk-ddr.c | 159 ++++++++++++---
drivers/clk/rockchip/clk.c | 2 +-
drivers/clk/rockchip/clk.h | 3 +-
drivers/devfreq/event/rockchip-dfi.c | 23 +--
drivers/devfreq/rk3399_dmc.c | 191 +++++++++++++++---
drivers/devfreq/rk3399_dmc_priv.h | 16 ++
drivers/gpu/drm/rockchip/rockchip_drm_drv.c | 46 +++++
drivers/gpu/drm/rockchip/rockchip_drm_drv.h | 9 +
drivers/gpu/drm/rockchip/rockchip_drm_fb.c | 35 ++++
drivers/gpu/drm/rockchip/rockchip_drm_vop.c | 34 ++++
drivers/soc/rockchip/pm_domains.c | 36 ++++
include/soc/rockchip/rk3399_dmc.h | 44 ++++
include/soc/rockchip/rk3399_grf.h | 21 ++
include/soc/rockchip/rockchip_sip.h | 1 +
20 files changed, 734 insertions(+), 71 deletions(-)
create mode 100644 arch/arm64/boot/dts/rockchip/rk3399-dram-default-timing.dtsi
create mode 100644 arch/arm64/boot/dts/rockchip/rk3399-dram.h
create mode 100644 drivers/devfreq/rk3399_dmc_priv.h
create mode 100644 include/soc/rockchip/rk3399_dmc.h
create mode 100644 include/soc/rockchip/rk3399_grf.h
--
2.17.0
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