clocksource/drivers/timer-atmel-tcb: Fix initialization on SAM9 hardware
[ Upstream commit 6d3bc4c02d59996d1d3180d8ed409a9d7d5900e0 ] On SAM9 hardware two cascaded 16 bit timers are used to form a 32 bit high resolution timer that is used as scheduler clock when the kernel has been configured that way (CONFIG_ATMEL_CLOCKSOURCE_TCB). The driver initially triggers a reset-to-zero of the two timers but this reset is only performed on the next rising clock. For the first timer this is ok - it will be in the next 60ns (16MHz clock). For the chained second timer this will only happen after the first timer overflows, i.e. after 2^16 clocks (~4ms with a 16MHz clock). So with other words the scheduler clock resets to 0 after the first 2^16 clock cycles. It looks like that the scheduler does not like this and behaves wrongly over its lifetime, e.g. some tasks are scheduled with a long delay. Why that is and if there are additional requirements for this behaviour has not been further analysed. There is a simple fix for resetting the second timer as well when the first timer is reset and this is to set the ATMEL_TC_ASWTRG_SET bit in the Channel Mode register (CMR) of the first timer. This will also rise the TIOA line (clock input of the second timer) when a software trigger respective SYNC is issued. Signed-off-by: Ronald Wahl <ronald.wahl@raritan.com> Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Link: https://lore.kernel.org/r/20231007161803.31342-1-rwahl@gmx.de Signed-off-by: Sasha Levin <sashal@kernel.org>
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@ -315,6 +315,7 @@ static void __init tcb_setup_dual_chan(struct atmel_tc *tc, int mck_divisor_idx)
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writel(mck_divisor_idx /* likely divide-by-8 */
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| ATMEL_TC_WAVE
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| ATMEL_TC_WAVESEL_UP /* free-run */
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| ATMEL_TC_ASWTRG_SET /* TIOA0 rises at software trigger */
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| ATMEL_TC_ACPA_SET /* TIOA0 rises at 0 */
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| ATMEL_TC_ACPC_CLEAR, /* (duty cycle 50%) */
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tcaddr + ATMEL_TC_REG(0, CMR));
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