linux-kernel - Re: [PATCH V1 08/12] soc/tegra: pmc: allow support for more tegra wake models

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Message-ID: <20190522124944.GI30938@ulmo>
Date:   Wed, 22 May 2019 14:49:44 +0200
From:   Thierry Reding <thierry.reding@...il.com>
To:     Sowjanya Komatineni <skomatineni@...dia.com>
Cc:     jonathanh@...dia.com, jckuo@...dia.com, talho@...dia.com,
        josephl@...dia.com, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH V1 08/12] soc/tegra: pmc: allow support for more tegra
 wake models

On Tue, May 21, 2019 at 04:31:19PM -0700, Sowjanya Komatineni wrote:
> This patch allows to create separate irq_set_wake and irq_set_type
> implementations for different tegra designs PMC that has different
> wake models which require difference wake registers and different
> programming sequence.
> 
> AOWAKE model support is available for Tegra186 and Tegra194 only
> and it resides within PMC and supports tiered wake architecture.
> 
> Tegra210 and prior tegra designs uses PMC directly to receive wake
> events and coordinate the wake sequence.
> 
> Signed-off-by: Sowjanya Komatineni <skomatineni@...dia.com>
> ---
>  drivers/soc/tegra/pmc.c | 21 ++++++++++++++++-----
>  1 file changed, 16 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/soc/tegra/pmc.c b/drivers/soc/tegra/pmc.c
> index 5648e5c09ef5..f77ce4b827e3 100644
> --- a/drivers/soc/tegra/pmc.c
> +++ b/drivers/soc/tegra/pmc.c
> @@ -235,6 +235,8 @@ struct tegra_pmc_soc {
>  	void (*setup_irq_polarity)(struct tegra_pmc *pmc,
>  				   struct device_node *np,
>  				   bool invert);
> +	int (*pmc_irq_set_wake)(struct irq_data *data, unsigned int on);
> +	int (*pmc_irq_set_type)(struct irq_data *data, unsigned int type);
>  
>  	const char * const *reset_sources;
>  	unsigned int num_reset_sources;
> @@ -1915,12 +1917,15 @@ static const struct irq_domain_ops tegra_pmc_irq_domain_ops = {
>  	.alloc = tegra_pmc_irq_alloc,
>  };
>  
> -static int tegra_pmc_irq_set_wake(struct irq_data *data, unsigned int on)
> +static int tegra186_pmc_irq_set_wake(struct irq_data *data, unsigned int on)
>  {
>  	struct tegra_pmc *pmc = irq_data_get_irq_chip_data(data);
>  	unsigned int offset, bit;
>  	u32 value;
>  
> +	if (data->hwirq < 0)
> +		return 0;
> +

This isn't going to work: data->hwirq is unsigned long so it will never
be < 0. Also, why is this necessary? I see that it's there in
tegra_pmc_irq_set_wake(), but I fail to remember why that's there. When
is this ever invalid?

Thierry

>  	offset = data->hwirq / 32;
>  	bit = data->hwirq % 32;
>  
> @@ -1943,12 +1948,12 @@ static int tegra_pmc_irq_set_wake(struct irq_data *data, unsigned int on)
>  	return 0;
>  }
>  
> -static int tegra_pmc_irq_set_type(struct irq_data *data, unsigned int type)
> +static int tegra186_pmc_irq_set_type(struct irq_data *data, unsigned int type)
>  {
>  	struct tegra_pmc *pmc = irq_data_get_irq_chip_data(data);
>  	u32 value;
>  
> -	if (data->hwirq == ULONG_MAX)
> +	if (data->hwirq < 0)
>  		return 0;
>  
>  	value = readl(pmc->wake + WAKE_AOWAKE_CNTRL(data->hwirq));
> @@ -1996,8 +2001,10 @@ static int tegra_pmc_irq_init(struct tegra_pmc *pmc)
>  	pmc->irq.irq_unmask = irq_chip_unmask_parent;
>  	pmc->irq.irq_eoi = irq_chip_eoi_parent;
>  	pmc->irq.irq_set_affinity = irq_chip_set_affinity_parent;
> -	pmc->irq.irq_set_type = tegra_pmc_irq_set_type;
> -	pmc->irq.irq_set_wake = tegra_pmc_irq_set_wake;
> +	if (pmc->soc->pmc_irq_set_type)
> +		pmc->irq.irq_set_type = pmc->soc->pmc_irq_set_type;
> +	if (pmc->soc->pmc_irq_set_wake)
> +		pmc->irq.irq_set_wake = pmc->soc->pmc_irq_set_wake;
>  
>  	pmc->domain = irq_domain_add_hierarchy(parent, 0, 96, pmc->dev->of_node,
>  					       &tegra_pmc_irq_domain_ops, pmc);
> @@ -2670,6 +2677,8 @@ static const struct tegra_pmc_soc tegra186_pmc_soc = {
>  	.regs = &tegra186_pmc_regs,
>  	.init = NULL,
>  	.setup_irq_polarity = tegra186_pmc_setup_irq_polarity,
> +	.pmc_irq_set_wake = tegra186_pmc_irq_set_wake,
> +	.pmc_irq_set_type = tegra186_pmc_irq_set_type,
>  	.reset_sources = tegra186_reset_sources,
>  	.num_reset_sources = ARRAY_SIZE(tegra186_reset_sources),
>  	.reset_levels = tegra186_reset_levels,
> @@ -2748,6 +2757,8 @@ static const struct tegra_pmc_soc tegra194_pmc_soc = {
>  	.regs = &tegra186_pmc_regs,
>  	.init = NULL,
>  	.setup_irq_polarity = tegra186_pmc_setup_irq_polarity,
> +	.pmc_irq_set_wake = tegra186_pmc_irq_set_wake,
> +	.pmc_irq_set_type = tegra186_pmc_irq_set_type,
>  	.num_wake_events = ARRAY_SIZE(tegra194_wake_events),
>  	.wake_events = tegra194_wake_events,
>  };
> -- 
> 2.7.4
> 

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