linux-kernel - Re: [PATCH v1 1/3] clocksource: rockchip: Make the driver more readability and compatible

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Message-ID: <5455510.kk9S3OIaU9@diego>
Date:	Tue, 22 Sep 2015 16:00:53 +0200
From:	Heiko Stübner <heiko@...ech.de>
To:	Caesar Wang <wxt@...k-chips.com>
Cc:	daniel.lezcano@...aro.org, will.deacon@....com,
	catalin.marinas@....com, devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-rockchip@...ts.infradead.org, tglx@...utronix.de,
	olof@...om.net
Subject: Re: [PATCH v1 1/3] clocksource: rockchip: Make the driver more readability and compatible

Hi Caesar,

Am Freitag, 18. September 2015, 16:51:09 schrieb Caesar Wang:
> Build the arm64 SoCs (e.g.: RK3368) on Rockchip platform,
> There are some failure with build up on timer driver for rockchip.
> 
> logs:
> ...
> drivers/clocksource/rockchip_timer.c:156:13: error: 'NO_IRQ' undeclared
> /tmp/ccdAnNy5.s:47: Error: missing immediate expression at  operand 1 --
> `dsb`
> ...
> 
> The problem was different semantics of dsb on btw arm32 and arm64,
> Here we can convert the dsb with insteading of dsb(sy).
> 
> NO_IRQ definition is missing for ARM64, since NO_IRQ being -1 is a
> legacy thing for ARM - all ARM drivers are supposed to be converted to
> use <= 0 or == 0 to detect invalid IRQs, and _eventually_ once all users
> are gone, NO_IRQ deleted. Modern drivers should _all_ be using !irq to
> detect invalid IRQs, and not using NO_IRQ.
> 
> Meanwhile, I change a bit to make the code more readability for driver
> when I check the code style.
> 
> Signed-off-by: Caesar Wang <wxt@...k-chips.com>
> ---
> 
> Changes in v1:
> - As Russell, Thomas, Daniel comments, let's replace NO_IRQ by '!irq'.
> 
>  drivers/clocksource/rockchip_timer.c | 29 +++++++++++++++--------------
>  1 file changed, 15 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/clocksource/rockchip_timer.c
> b/drivers/clocksource/rockchip_timer.c index bb2c2b0..e1af449 100644
> --- a/drivers/clocksource/rockchip_timer.c
> +++ b/drivers/clocksource/rockchip_timer.c
> @@ -17,16 +17,16 @@
> 
>  #define TIMER_NAME "rk_timer"
> 
> -#define TIMER_LOAD_COUNT0 0x00
> -#define TIMER_LOAD_COUNT1 0x04
> -#define TIMER_CONTROL_REG 0x10
> -#define TIMER_INT_STATUS 0x18
> +#define TIMER_LOAD_COUNT0	0x00
> +#define TIMER_LOAD_COUNT1	0x04
> +#define TIMER_CONTROL_REG	0x10
> +#define TIMER_INT_STATUS	0x18
> 
> -#define TIMER_DISABLE 0x0
> -#define TIMER_ENABLE 0x1
> -#define TIMER_MODE_FREE_RUNNING (0 << 1)
> -#define TIMER_MODE_USER_DEFINED_COUNT (1 << 1)
> -#define TIMER_INT_UNMASK (1 << 2)
> +#define TIMER_DISABLE			(0 << 0)
> +#define TIMER_ENABLE			(1 << 0)
> +#define TIMER_MODE_FREE_RUNNING		(0 << 1)
> +#define TIMER_MODE_USER_DEFINED_COUNT	(1 << 1)
> +#define TIMER_INT_UNMASK		(1 << 2)

not sure how Daniel sees this, but those could count as "unrelated change", as 
they have nothing to do with the arm64 build-fixes.


> 
>  struct bc_timer {
>  	struct clock_event_device ce;
> @@ -49,14 +49,14 @@ static inline void __iomem *rk_base(struct
> clock_event_device *ce) static inline void rk_timer_disable(struct
> clock_event_device *ce) {
>  	writel_relaxed(TIMER_DISABLE, rk_base(ce) + TIMER_CONTROL_REG);
> -	dsb();
> +	dsb(sy);
>  }
> 
>  static inline void rk_timer_enable(struct clock_event_device *ce, u32
> flags) {
>  	writel_relaxed(TIMER_ENABLE | TIMER_INT_UNMASK | flags,
>  		       rk_base(ce) + TIMER_CONTROL_REG);
> -	dsb();
> +	dsb(sy);
>  }
> 
>  static void rk_timer_update_counter(unsigned long cycles,
> @@ -64,13 +64,13 @@ static void rk_timer_update_counter(unsigned long
> cycles, {
>  	writel_relaxed(cycles, rk_base(ce) + TIMER_LOAD_COUNT0);
>  	writel_relaxed(0, rk_base(ce) + TIMER_LOAD_COUNT1);
> -	dsb();
> +	dsb(sy);
>  }
> 
>  static void rk_timer_interrupt_clear(struct clock_event_device *ce)
>  {
>  	writel_relaxed(1, rk_base(ce) + TIMER_INT_STATUS);
> -	dsb();
> +	dsb(sy);
>  }
> 
>  static inline int rk_timer_set_next_event(unsigned long cycles,
> @@ -148,7 +148,7 @@ static void __init rk_timer_init(struct device_node *np)
> bc_timer.freq = clk_get_rate(timer_clk);
> 
>  	irq = irq_of_parse_and_map(np, 0);
> -	if (irq == NO_IRQ) {
> +	if (!irq) {
>  		pr_err("Failed to map interrupts for '%s'\n", TIMER_NAME);
>  		return;
>  	}
> @@ -173,4 +173,5 @@ static void __init rk_timer_init(struct device_node *np)
> 
>  	clockevents_config_and_register(ce, bc_timer.freq, 1, UINT_MAX);
>  }
> +

unnecessary addition of a blank line (same reasons as above)
>  CLOCKSOURCE_OF_DECLARE(rk_timer, "rockchip,rk3288-timer", rk_timer_init);


Heiko
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