Re: [PATCH V1 01/12] irqchip: tegra: do not disable COP IRQ during suspend

[Thierry Reding <thierry.reding@gmail.com>]

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On Tue, May 21, 2019 at 04:31:12PM -0700, Sowjanya Komatineni wrote:
> BPMP-lite still need IRQ function to finish SC7 suspend sequence for
> Tegra210.
> 
> This patch has fix for leaving the COP IRQ enabled for Tegra210 during
> interrupt controller suspend operation.
> 
> Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
> ---
>  drivers/irqchip/irq-tegra.c | 10 ++++++++--
>  1 file changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/irqchip/irq-tegra.c b/drivers/irqchip/irq-tegra.c
> index 0abc0cd1c32e..1882373fa1fd 100644
> --- a/drivers/irqchip/irq-tegra.c
> +++ b/drivers/irqchip/irq-tegra.c
> @@ -53,18 +53,24 @@ static unsigned int num_ictlrs;
>  
>  struct tegra_ictlr_soc {
>  	unsigned int num_ictlrs;
> +	bool has_bpmpl;

Maybe spell out "has_bpmp_lite" to avoid potential confusion.

>  };
>  
> +static const struct tegra_ictlr_soc *soc;
> +

Can you make this a field in struct tegra_ictlr_info to avoid having too
many global variables?

>  static const struct tegra_ictlr_soc tegra20_ictlr_soc = {
>  	.num_ictlrs = 4,
> +	.has_bpmpl = false,
>  };
>  
>  static const struct tegra_ictlr_soc tegra30_ictlr_soc = {
>  	.num_ictlrs = 5,
> +	.has_bpmpl = false,
>  };
>  
>  static const struct tegra_ictlr_soc tegra210_ictlr_soc = {
>  	.num_ictlrs = 6,
> +	.has_bpmpl = true,
>  };
>  
>  static const struct of_device_id ictlr_matches[] = {
> @@ -157,7 +163,8 @@ static int tegra_ictlr_suspend(void)
>  		lic->cop_iep[i] = readl_relaxed(ictlr + ICTLR_COP_IEP_CLASS);
>  
>  		/* Disable COP interrupts */
> -		writel_relaxed(~0ul, ictlr + ICTLR_COP_IER_CLR);
> +		if (!soc->has_bpmpl)
> +			writel_relaxed(~0ul, ictlr + ICTLR_COP_IER_CLR);

Maybe adjust the comment to explain. It may not immediately be obvious
to anyone how BPMP-lite is related to COP.

>  
>  		/* Disable CPU interrupts */
>  		writel_relaxed(~0ul, ictlr + ICTLR_CPU_IER_CLR);
> @@ -286,7 +293,6 @@ static int __init tegra_ictlr_init(struct device_node *node,
>  {
>  	struct irq_domain *parent_domain, *domain;
>  	const struct of_device_id *match;
> -	const struct tegra_ictlr_soc *soc;

As mentioned above, perhaps keep this here and assign this to lic->soc
later on so that we have only a single global variable.

Thierry

>  	unsigned int i;
>  	int err;
>  
> -- 
> 2.7.4
> 

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