linux-kernel - Re: [PATCH v4] irqchip/mmp: only touch the PJ4 & FIQ bits on enable/disable

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Date:   Tue, 15 Jan 2019 11:22:36 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Lubomir Rintel <lkundrak@...sk>
cc:     Marc Zyngier <marc.zyngier@....com>,
        Jason Cooper <jason@...edaemon.net>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4] irqchip/mmp: only touch the PJ4 & FIQ bits on
 enable/disable

On Thu, 20 Dec 2018, Lubomir Rintel wrote:

> On an OLPC XO 1.75 machine, the "security processor" handles the GPIO 71
> and 72 interrupts. Don't reset the "route to SP" bit (4).
> 
> I'm just assuming the bit 4 is the "route to SP" bit -- it fixes the
> SP-based keyboard for me and <mach-mmp/regs-icu.h> defines
> ICU_INT_ROUTE_SP_IRQ to be 1 << 4. When asked for a data sheet, Marvell
> was not helpful.
> 
> Signed-off-by: Lubomir Rintel <lkundrak@...sk>
> Acked-by: Pavel Machek <pavel@....cz>
> 
> ---
> I'm not removing the defines from regs-icu.h at the moment.
> Of the MPP2 defines there, only MMP2_ICU_INT4_MASK ends up actually
> being used, in one place. That said, the header servers mostly as
> a documentation, because the documentation for the platform is lacking.
> 
> Changes since v3:
> - Use #defined instead of integer literals
> 
> Changes since v2:
> - Correct subsystem maintainers on Cc (irqchip)
> 
> Changes since v1:
> - Adjusted wording & ack from Pavel
> ---
>  drivers/irqchip/irq-mmp.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/irqchip/irq-mmp.c b/drivers/irqchip/irq-mmp.c
> index 25f32e1d7764..65fa5a1d8310 100644
> --- a/drivers/irqchip/irq-mmp.c
> +++ b/drivers/irqchip/irq-mmp.c
> @@ -34,6 +34,10 @@
>  #define SEL_INT_PENDING		(1 << 6)
>  #define SEL_INT_NUM_MASK	0x3f
>  
> +#define MMP2_ICU_INT_ROUTE_SP_IRQ	(1 << 4)

Where is this used?

> +#define MMP2_ICU_INT_ROUTE_PJ4_IRQ	(1 << 5)
> +#define MMP2_ICU_INT_ROUTE_PJ4_FIQ	(1 << 6)
> +
>  struct icu_chip_data {
>  	int			nr_irqs;
>  	unsigned int		virq_base;
> @@ -190,7 +194,8 @@ static const struct mmp_intc_conf mmp_conf = {
>  static const struct mmp_intc_conf mmp2_conf = {
>  	.conf_enable	= 0x20,
>  	.conf_disable	= 0x0,
> -	.conf_mask	= 0x7f,
> +	.conf_mask	= MMP2_ICU_INT_ROUTE_PJ4_IRQ |
> +			  MMP2_ICU_INT_ROUTE_PJ4_FIQ,

So the mask changes from 0x7f to 0x60, but the changelog does not mention
any of this. It only talks about bit 4 ....

Thanks,

	tglx