user/sven/linux.git/drivers/clocksource/arm_global_timer.c, branch v4.9.142

clocksource/arm_global_timer: Convert to hotplug state machine

2016-07-15T08:41:44Z

Install the callbacks via the state machine and let the core invoke the callbacks on the already online CPUs. Signed-off-by: Richard Cochran Signed-off-by: Anna-Maria Gleixner Reviewed-by: Sebastian Andrzej Siewior Cc: Daniel Lezcano Cc: Linus Torvalds Cc: Maxime Coquelin Cc: Patrice Chotard Cc: Peter Zijlstra Cc: Srinivas Kandagatla Cc: Thomas Gleixner Cc: kernel@stlinux.com Cc: linux-arm-kernel@lists.infradead.org Cc: rt@linutronix.de Link: http://lkml.kernel.org/r/20160713153338.062741642@linutronix.de Signed-off-by: Ingo Molnar

clocksources: Switch back to the clksrc table

2016-06-28T08:19:35Z

All the clocksource drivers's init function are now converted to return an error code. CLOCKSOURCE_OF_DECLARE is no longer used as well as the clksrc-of table. Let's convert back the names: - CLOCKSOURCE_OF_DECLARE_RET => CLOCKSOURCE_OF_DECLARE - clksrc-of-ret => clksrc-of Signed-off-by: Daniel Lezcano For exynos_mct and samsung_pwm_timer: Acked-by: Krzysztof Kozlowski For arch/arc: Acked-by: Vineet Gupta For mediatek driver: Acked-by: Matthias Brugger For the Rockchip-part Acked-by: Heiko Stuebner For STi : Acked-by: Patrice Chotard For the mps2-timer.c and versatile.c changes: Acked-by: Liviu Dudau For the OXNAS part : Acked-by: Neil Armstrong For LPC32xx driver: Acked-by: Sylvain Lemieux For Broadcom Kona timer change: Acked-by: Ray Jui For Sun4i and Sun5i: Acked-by: Chen-Yu Tsai For Meson6: Acked-by: Carlo Caione For Keystone: Acked-by: Santosh Shilimkar For NPS: Acked-by: Noam Camus For bcm2835: Acked-by: Eric Anholt

clocksource/drivers/arm_global_timer: Convert init function to return error

2016-06-28T08:19:22Z

The init functions do not return any error. They behave as the following: - panic, thus leading to a kernel crash while another timer may work and make the system boot up correctly or - print an error and let the caller unaware if the state of the system Change that by converting the init functions to return an error conforming to the CLOCKSOURCE_OF_RET prototype. Proper error handling (rollback, errno value) will be changed later case by case, thus this change just return back an error or success in the init function. Signed-off-by: Daniel Lezcano Acked-by: Maxime Coquelin

clockevents/drivers/arm_global_timer: Implement ->set_state_oneshot_stopped()

2016-02-25T13:34:06Z

set_state_oneshot_stopped() is called by the clkevt core, when the next event is required at an expiry time of 'KTIME_MAX'. This normally happens with NO_HZ_{IDLE|FULL} in both LOWRES/HIGHRES modes. This patch makes the clockevent device to stop on such an event, to avoid spurious interrupts, as explained by: commit 8fff52fd5093 ("clockevents: Introduce CLOCK_EVT_STATE_ONESHOT_STOPPED state"). Signed-off-by: Viresh Kumar Signed-off-by: Daniel Lezcano

clocksource/drivers/arm_global_timer: Register delay timer

2016-02-25T13:34:04Z

Provide a delay timer using the lower 32-bits of the global timer so that we can use that instead of having to calibrating delays. Signed-off-by: Rabin Vincent Signed-off-by: Daniel Lezcano

clocksource/drivers/arm_global_timer: Fix suspend resume

2015-12-16T08:58:47Z

Now the System stall is observed on TI AM437x based board (am437x-gp-evm) during resuming from System suspend when ARM Global timer is selected as clocksource device (CPUIdle not enabled) - SysRq are working, but nothing else. The reason of stall is that ARM Global timer loses its contexts during System suspend: GT_CONTROL.TIMER_ENABLE = 0 (unbanked) GT_COUNTERx = 0 Hence, update ARM Global timer driver to reflect above behaviour - re-enable ARM Global timer on resume (GT_CONTROL.TIMER_ENABLE = 1) if not enabled. CC: Arnd Bergmann Cc: John Stultz Cc: Felipe Balbi Cc: Tony Lindgren Cc: Marc Zyngier Reviewed-by: Santosh Shilimkar Signed-off-by: Grygorii Strashko Signed-off-by: Daniel Lezcano

clockevents/drivers/arm_global_timer: Use writel_relaxed in gt_compare_set

2015-12-16T08:44:23Z

Use the relaxed version to improve performance. we measured time of 4096 rounds of gt_compare_set() spent on Marvell BG2Q: before the patch: 3690648ns on average after the patch: 1083023ns on average improved by 70%! Signed-off-by: Jisheng Zhang Signed-off-by: Daniel Lezcano

clocksource/drivers/arm_global_timer: Prevent ftrace recursion

2015-10-27T00:32:33Z

Currently arm_global_timer can be used as a scheduler clock. We properly marked gt_sched_clock_read() as notrace but we then call another function gt_counter_read() that _wasn't_ notrace. Having a traceable function in the sched_clock() path leads to a recursion within ftrace and a kernel crash. Fix this by adding an extra notrace function to keep other users of gt_counter_read() traceable. Signed-off-by: Jisheng Zhang Signed-off-by: Daniel Lezcano

clockevents/drivers/arm_global_timer: Migrate to new 'set-state' interface

2015-08-06T10:16:41Z

Migrate arm_global_timer driver to the new 'set-state' interface provided by the clockevents core, the earlier 'set-mode' interface is marked obsolete now. This also enables us to implement callbacks for new states of clockevent devices, for example: ONESHOT_STOPPED. Acked-by: Daniel Lezcano Acked-by: Maxime Coquelin Acked-by: Srinivas Kandagatla Cc: Srinivas Kandagatla Cc: Maxime Coquelin Cc: Patrice Chotard Signed-off-by: Viresh Kumar Signed-off-by: Daniel Lezcano

ARM: make it easier to check the CPU part number correctly

2014-07-18T11:29:02Z

Ensure that platform maintainers check the CPU part number in the right manner: the CPU part number is meaningless without also checking the CPU implement(e|o)r (choose your preferred spelling!) Provide an interface which returns both the implementer and part number together, and update the definitions to include the implementer. Mark the old function as being deprecated... indeed, using the old function with the definitions will now always evaluate as false, so people must update their un-merged code to the new function. While this could be avoided by adding new definitions, we'd also have to create new names for them which would be awkward. Acked-by: Nicolas Pitre Signed-off-by: Russell King