PatchTrack

From: Heiko Stuebner <heiko@...> Date: Fri, 18 Dec 2015 17:51:55 +0100

Commit-Message

As commit 1d33929e2a2b ("clk: rockchip: switch PLLs to slow mode before reboot for rk3288") states, switching the PLLs to slow-mode is only necessary when rebooting using the soft-reset done through the CRU. The dwc2 controllers used create really big number of interrupts in special constellations involving usb-hubs and their number is so high, it can even overwhelm the interrupt handler if the cpu-speed os to low. Right now the PLLs are put into slow-mode in a shutdown syscore_ops callback which means it happens on all reboots (not only the soft-reset ones) and even on poweroff actions. This can result in the system not powering off and getting stuck instead, so we should move the slow-mode change nearer to the actual reboot action. For this we introduce the possiblity to also set a callback that gets called from the restart-handler directly prior to restarting the system and move the shutdown-callback to this new option. With this the slow-mode switch is done only on the necessary reboots and also has a smaller possibility of causing artifacts. Fixes: 1d33929e2a2b ("clk: rockchip: switch PLLs to slow mode before reboot for rk3288") Signed-off-by: Heiko Stuebner <heiko.stuebner@...> Reviewed-by: Douglas Anderson <dianders@...>

Patch-Comment

drivers/clk/rockchip/clk-rk3036.c | 2 +- drivers/clk/rockchip/clk-rk3188.c | 2 +- drivers/clk/rockchip/clk-rk3228.c | 2 +- drivers/clk/rockchip/clk-rk3288.c | 4 ++-- drivers/clk/rockchip/clk-rk3368.c | 2 +- drivers/clk/rockchip/clk.c | 7 ++++++- drivers/clk/rockchip/clk.h | 2 +- 7 files changed, 13 insertions(+), 8 deletions(-)

Statistics

• 13 lines added
• 8 lines removed

Changes