Hi Levin, Am Samstag, 4. August 2018, 09:31:02 CEST schrieb djw@xxxxxxxxxxxxx: > From: Levin Du <djw@xxxxxxxxxxxxx> > > PWM2 is commonly used to control voltage of PWM regulator of VDD_LOG in > RK3399. On the Firefly-RK3399 board, PWM2 outputs 40 KHz square wave > from power on and the VDD_LOG is about 0.9V. When the kernel boots > normally into the system, the PWM2 keeps outputing PWM signal. > > But the kernel hangs randomly after "Starting kernel ..." line on that > board. When it happens, PWM2 outputs high level which causes VDD_LOG > drops to 0.4V below the normal operating voltage. > > By adding "pclk_rkpwm_pmu" to the rk3399_pmucru_critical_clocks array, > PWM clock is ensured to be prepared at startup and the PWM2 output is > normal. After repeated tests, the early boot hang is gone. > > This patch works on both Firefly-RK3399 and ROC-RK3399-PC boards. > > Signed-off-by: Levin Du <djw@xxxxxxxxxxxxx> applied to my clk-branch Thanks for tracking that down Heiko _______________________________________________ Linux-rockchip mailing list Linux-rockchip@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/linux-rockchip
