[PATCH v3 0/6] clocksource: rework Atmel TCB timer driver

[Alexandre Belloni]

On 29/03/2018 at 13:31:18 +0200, Alexander Dahl wrote:
> Pretty sure. I rebuilt the whole BSP and added another line to the kernel 
> source to see if the tree I applied the patches to, was actually built:
> 
> 
> diff --git a/drivers/clocksource/timer-atmel-tcb.c b/drivers/clocksource/timer-atmel-tcb.c
> index 7fde9cfbf203..f85affc74a86 100644
> --- a/drivers/clocksource/timer-atmel-tcb.c
> +++ b/drivers/clocksource/timer-atmel-tcb.c
> @@ -222,7 +222,8 @@ static int __init tc_clkevt_register(struct device_node *node,
>                 goto err_slow;
>         clk_disable(tce.clk);
>  
> -       clockevents_config_and_register(&tce.clkevt, 32768, 1, bits - 1);
> +       pr_info( "*** bits: 0x%x, BIT(bits): 0x%lx\n", bits, BIT(bits) );
> +       clockevents_config_and_register(&tce.clkevt, 32768, 1, BIT(bits) - 1);
>  
>         ret = request_irq(tce.irq, tc_clkevt2_irq, IRQF_TIMER | IRQF_SHARED,
>                           tce.clkevt.name, &tce);
> 
> 

I've just tested on a g20, old driver:
INT                NAME          RATE             MAX
 16 [vel     at91_tick,]   175 Ints/s     (max:   231)
 19 [ vel     tc_clkevt]   129 Ints/s     (max:   129)


new driver:
INT                NAME          RATE             MAX
 17 [vel     timer at fffa]   129 Ints/s     (max:   129)
 18 [     vel     ttyS0]   175 Ints/s     (max:   231)


-- 
Alexandre Belloni, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com