rk3399 platform have dfi controller can monitor ddr load, and dcf controller to handle ddr register so we can get the right ddr frequency and make ddr controller happy work(which will implement in bl31). So we do ddr frequency scaling with following flow:
kernel bl31
monitor ddr load | | get_target_rate | | pass rate to bl31 clk_set_rate(ddr) --------------------->run dcf flow | | | | wait dcf interrupt<-------------------trigger dcf interrupt | | return
Lin Huang (4): rockchip: rockchip: add new clock-type for the ddrclk clk: rockchip: rk3399: add ddrc clock support PM / devfreq: rockchip: add devfreq driver for rk3399 dmc drm/rockchip: Add dmc notifier in vop driver
drivers/clk/rockchip/Makefile | 1 + drivers/clk/rockchip/clk-ddr.c | 147 ++++++++++ drivers/clk/rockchip/clk-rk3399.c | 16 + drivers/clk/rockchip/clk.c | 9 + drivers/clk/rockchip/clk.h | 27 ++ drivers/devfreq/Kconfig | 2 +- drivers/devfreq/Makefile | 1 + drivers/devfreq/rockchip/Kconfig | 14 + drivers/devfreq/rockchip/Makefile | 2 + drivers/devfreq/rockchip/rk3399_dmc.c | 438 ++++++++++++++++++++++++++++ drivers/devfreq/rockchip/rockchip_dmc.c | 132 +++++++++ drivers/gpu/drm/rockchip/rockchip_drm_vop.c | 51 +++- include/dt-bindings/clock/rk3399-cru.h | 1 + include/soc/rockchip/rockchip_dmc.h | 44 +++ 14 files changed, 882 insertions(+), 3 deletions(-) create mode 100644 drivers/clk/rockchip/clk-ddr.c create mode 100644 drivers/devfreq/rockchip/Kconfig create mode 100644 drivers/devfreq/rockchip/Makefile create mode 100644 drivers/devfreq/rockchip/rk3399_dmc.c create mode 100644 drivers/devfreq/rockchip/rockchip_dmc.c create mode 100644 include/soc/rockchip/rockchip_dmc.h