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From: Marc Zyngier <marc.zyngier@arm.com>
To: Bartosz Golaszewski <brgl@bgdev.pl>, Sekhar Nori <nsekhar@ti.com>,
	Kevin Hilman <khilman@kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Jason Cooper <jason@lakedaemon.net>,
	David Lechner <david@lechnology.com>
Cc: Bartosz Golaszewski <bgolaszewski@baylibre.com>,
	linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [RESEND PATCH v2 17/33] ARM: davinci: aintc: move timer-specific irq_set_handler() out of irq.c
Date: Mon, 11 Feb 2019 13:00:40 +0000
Message-ID: <67127a57-3d1f-5cf4-efb8-f1a2a49b3a2a@arm.com> (raw)
In-Reply-To: <20190211122606.8662-18-brgl@bgdev.pl>

On 11/02/2019 12:25, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bgolaszewski@baylibre.com>
> 
> I've been unable to figure out exactly why, but it seems that the
> IRQ_TINT1_TINT34 interrupt for timer 1 needs to be handled as a
> level irq, not edge like all others.

That's probably because its comparator maintains the interrupt asserted
as long as its value is less than the counter.

Level-trigger timers are the most common thing on this side of the known
universe.

> 
> Let's move the handler setup out of the aintc driver where it's lived
> since the beginning and into the dm* SoC-specific files where it
> belongs.
> 
> Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
> ---
>  arch/arm/mach-davinci/dm355.c  | 8 ++++++++
>  arch/arm/mach-davinci/dm365.c  | 8 ++++++++
>  arch/arm/mach-davinci/dm644x.c | 8 ++++++++
>  arch/arm/mach-davinci/dm646x.c | 8 ++++++++
>  arch/arm/mach-davinci/irq.c    | 3 ---
>  5 files changed, 32 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/arm/mach-davinci/dm355.c b/arch/arm/mach-davinci/dm355.c
> index c7cd765114af..a732f2ea1d9a 100644
> --- a/arch/arm/mach-davinci/dm355.c
> +++ b/arch/arm/mach-davinci/dm355.c
> @@ -15,6 +15,7 @@
>  #include <linux/dma-mapping.h>
>  #include <linux/dmaengine.h>
>  #include <linux/init.h>
> +#include <linux/irq.h>
>  #include <linux/irqchip/irq-davinci-aintc.h>
>  #include <linux/platform_data/edma.h>
>  #include <linux/platform_data/gpio-davinci.h>
> @@ -744,6 +745,13 @@ void __init dm355_init_time(void)
>  	psc = ioremap(DAVINCI_PWR_SLEEP_CNTRL_BASE, SZ_4K);
>  	dm355_psc_init(NULL, psc);
>  
> +	/*
> +	 * Nobody knows why anymore, but this interrupt has been handled as
> +	 * a level irq from the very beginning of davinci support in mainline
> +	 * linux.
> +	 */
> +	irq_set_handler(DAVINCI_INTC_IRQ(IRQ_TINT1_TINT34), handle_level_irq);
> +

Now, the real question is: why isn't that set as part of the
set_irq_type() callback, instead of hardcoding it in the platform?

This is exactly the kind of information that should come as part of the
DT or from the driver as one of the request_irq() flags.

It would save quite a bit of boilerplate code.

Thanks,

	M.
-- 
Jazz is not dead. It just smells funny...

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Thread overview: 49+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-02-11 12:25 [RESEND PATCH v2 00/33] ARM: davinci: modernize the irq support Bartosz Golaszewski
2019-02-11 12:25 ` [RESEND PATCH v2 01/33] ARM: davinci: remove intc_host_map from davinci_soc_info struct Bartosz Golaszewski
2019-02-11 12:25 ` [RESEND PATCH v2 02/33] ARM: davinci: aintc: use irq domain Bartosz Golaszewski
2019-02-12  8:26   ` Sekhar Nori
2019-02-11 12:25 ` [RESEND PATCH v2 03/33] ARM: davinci: select GENERIC_IRQ_MULTI_HANDLER Bartosz Golaszewski
2019-02-11 12:50   ` Marc Zyngier
2019-02-11 13:08     ` Bartosz Golaszewski
2019-02-11 12:25 ` [RESEND PATCH v2 04/33] ARM: davinci: remove davinci_intc_type Bartosz Golaszewski
2019-02-11 12:25 ` [RESEND PATCH v2 05/33] ARM: davinci: pull davinci_intc_base into the respective intc drivers Bartosz Golaszewski
2019-02-11 12:25 ` [RESEND PATCH v2 06/33] ARM: davinci: wrap HW interrupt numbers with a macro Bartosz Golaszewski
2019-02-11 12:25 ` [RESEND PATCH v2 07/33] ARM: davinci: select SPARSE_IRQ Bartosz Golaszewski
2019-02-11 12:25 ` [RESEND PATCH v2 08/33] ARM: davinci: make irqs.h a local header Bartosz Golaszewski
2019-02-12  8:31   ` Sekhar Nori
2019-02-11 12:25 ` [RESEND PATCH v2 09/33] ARM: davinci: aintc: drop GPL license boilerplate Bartosz Golaszewski
2019-02-11 12:25 ` [RESEND PATCH v2 10/33] ARM: davinci: aintc: wrap davinci_irq_init() with a helper Bartosz Golaszewski
2019-02-11 12:25 ` [RESEND PATCH v2 11/33] ARM: davinci: aintc: use a common prefix for symbols in the driver Bartosz Golaszewski
2019-02-11 12:25 ` [RESEND PATCH v2 12/33] ARM: davinci: aintc: drop the 00 prefix from register offsets Bartosz Golaszewski
2019-02-11 12:25 ` [RESEND PATCH v2 13/33] ARM: davinci: aintc: use readl/writel_relaxed() Bartosz Golaszewski
2019-02-11 12:54   ` Marc Zyngier
2019-02-11 12:25 ` [RESEND PATCH v2 14/33] irqchip: davinci-aintc: add a new config structure Bartosz Golaszewski
2019-02-11 12:25 ` [RESEND PATCH v2 15/33] ARM: davinci: aintc: use the new irqchip config structure in dm* SoCs Bartosz Golaszewski
2019-02-11 12:25 ` [RESEND PATCH v2 16/33] ARM: davinci: aintc: use the new config structure Bartosz Golaszewski
2019-02-11 12:25 ` [RESEND PATCH v2 17/33] ARM: davinci: aintc: move timer-specific irq_set_handler() out of irq.c Bartosz Golaszewski
2019-02-11 13:00   ` Marc Zyngier [this message]
2019-02-12  5:51     ` Sekhar Nori
2019-02-14 10:55       ` Marc Zyngier
2019-02-11 12:25 ` [RESEND PATCH v2 18/33] ARM: davinci: aintc: remove unnecessary includes Bartosz Golaszewski
2019-02-11 12:25 ` [RESEND PATCH v2 19/33] irqchip: davinci-aintc: move the driver to drivers/irqchip Bartosz Golaszewski
2019-02-11 12:25 ` [RESEND PATCH v2 20/33] ARM: davinci: cp-intc: remove cp_intc.h Bartosz Golaszewski
2019-02-11 12:25 ` [RESEND PATCH v2 21/33] ARM: davinci: cp-intc: add a wrapper around cp_intc_init() Bartosz Golaszewski
2019-02-11 12:25 ` [RESEND PATCH v2 22/33] irqchip: davinci-cp-intc: add a new config structure Bartosz Golaszewski
2019-02-11 12:25 ` [RESEND PATCH v2 23/33] ARM: davinci: cp-intc: add the new config structures for da8xx SoCs Bartosz Golaszewski
2019-02-11 12:25 ` [RESEND PATCH v2 24/33] ARM: davinci: cp-intc: use a common prefix for all symbols Bartosz Golaszewski
2019-02-11 12:25 ` [RESEND PATCH v2 25/33] ARM: davinci: cp-intc: convert all hex numbers to lowercase Bartosz Golaszewski
2019-02-11 12:25 ` [RESEND PATCH v2 26/33] ARM: davinci: cp-intc: use the new-style config structure Bartosz Golaszewski
2019-02-11 12:26 ` [RESEND PATCH v2 27/33] ARM: davinci: cp-intc: improve coding style Bartosz Golaszewski
2019-02-11 12:26 ` [RESEND PATCH v2 28/33] ARM: davinci: cp-intc: unify error handling Bartosz Golaszewski
2019-02-11 13:07   ` Marc Zyngier
2019-02-11 13:10     ` Bartosz Golaszewski
2019-02-11 13:20       ` Marc Zyngier
2019-02-11 12:26 ` [RESEND PATCH v2 29/33] ARM: davinci: cp-intc: use readl/writel_relaxed() Bartosz Golaszewski
2019-02-11 13:08   ` Marc Zyngier
2019-02-12  9:32     ` Bartosz Golaszewski
2019-02-11 12:26 ` [RESEND PATCH v2 30/33] ARM: davinci: cp-intc: drop GPL license boilerplate Bartosz Golaszewski
2019-02-11 12:26 ` [RESEND PATCH v2 31/33] ARM: davinci: cp-intc: remove redundant comments Bartosz Golaszewski
2019-02-11 12:26 ` [RESEND PATCH v2 32/33] irqchip: davinci-cp-intc: move the driver to drivers/irqchip Bartosz Golaszewski
2019-02-11 12:26 ` [RESEND PATCH v2 33/33] ARM: davinci: remove intc related fields from davinci_soc_info Bartosz Golaszewski
2019-02-12  8:24 ` [RESEND PATCH v2 00/33] ARM: davinci: modernize the irq support Sekhar Nori
2019-02-12  8:31   ` Bartosz Golaszewski

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