linux-kernel - Re: [PATCH] pinctrl: qcom: Add intr_target_width to define intr_target

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Date:   Fri, 14 Jul 2023 16:32:30 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Ninad Naik <quic_ninanaik@...cinc.com>, andersson@...nel.org,
        agross@...nel.org
Cc:     linux-arm-msm@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-kernel@...r.kernel.org, quic_ppareek@...cinc.com,
        psodagud@...cinc.com, quic_kprasan@...cinc.com
Subject: Re: [PATCH] pinctrl: qcom: Add intr_target_width to define
 intr_target_bit field width

On 14.07.2023 08:10, Ninad Naik wrote:
> SA8775 and newer target have added support for an increased number of
> interrupt targets. To implement this change, the intr_target field, which
> is used to configure the interrupt target in the interrupt configuration
> register is increased from 3 bits to 4 bits.
> 
> In accordance to these updates, a new intr_target_width member is
> introduced in msm_pingroup structure. This member stores the value of
> width of intr_target field in the interrupt configuration register. This
> value is used to dynamically calculate and generate mask for setting the
> intr_target field. By default, this mask is set to 3 bit wide, to ensure
> backward compatibility with the older targets.
> 
> Signed-off-by: Ninad Naik <quic_ninanaik@...cinc.com>
> ---
Reviewed-by: Konrad Dybcio <konrad.dybcio@...aro.org>

one nit below

>  drivers/pinctrl/qcom/pinctrl-msm.c     | 9 ++++++---
>  drivers/pinctrl/qcom/pinctrl-msm.h     | 2 ++
>  drivers/pinctrl/qcom/pinctrl-sa8775p.c | 1 +
>  3 files changed, 9 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/pinctrl/qcom/pinctrl-msm.c b/drivers/pinctrl/qcom/pinctrl-msm.c
> index 2585ef2b2793..6ebcaa2220af 100644
> --- a/drivers/pinctrl/qcom/pinctrl-msm.c
> +++ b/drivers/pinctrl/qcom/pinctrl-msm.c
> @@ -1038,6 +1038,7 @@ static int msm_gpio_irq_set_type(struct irq_data *d, unsigned int type)
>  	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
>  	struct msm_pinctrl *pctrl = gpiochip_get_data(gc);
>  	const struct msm_pingroup *g;
> +	u32 intr_target_mask = 0x7;
This could be GENMASK(2, 0)

Konrad
>  	unsigned long flags;
>  	bool was_enabled;
>  	u32 val;
> @@ -1074,13 +1075,15 @@ static int msm_gpio_irq_set_type(struct irq_data *d, unsigned int type)
>  	 * With intr_target_use_scm interrupts are routed to
>  	 * application cpu using scm calls.
>  	 */
> +	if (g->intr_target_width)
> +		intr_target_mask = GENMASK(g->intr_target_width - 1, 0);
> +
>  	if (pctrl->intr_target_use_scm) {
>  		u32 addr = pctrl->phys_base[0] + g->intr_target_reg;
>  		int ret;
>  
>  		qcom_scm_io_readl(addr, &val);
> -
> -		val &= ~(7 << g->intr_target_bit);
> +		val &= ~(intr_target_mask << g->intr_target_bit);
>  		val |= g->intr_target_kpss_val << g->intr_target_bit;
>  
>  		ret = qcom_scm_io_writel(addr, val);
> @@ -1090,7 +1093,7 @@ static int msm_gpio_irq_set_type(struct irq_data *d, unsigned int type)
>  				d->hwirq);
>  	} else {
>  		val = msm_readl_intr_target(pctrl, g);
> -		val &= ~(7 << g->intr_target_bit);
> +		val &= ~(intr_target_mask << g->intr_target_bit);
>  		val |= g->intr_target_kpss_val << g->intr_target_bit;
>  		msm_writel_intr_target(val, pctrl, g);
>  	}
> diff --git a/drivers/pinctrl/qcom/pinctrl-msm.h b/drivers/pinctrl/qcom/pinctrl-msm.h
> index 5e4410bed823..1d2f2e904da1 100644
> --- a/drivers/pinctrl/qcom/pinctrl-msm.h
> +++ b/drivers/pinctrl/qcom/pinctrl-msm.h
> @@ -59,6 +59,7 @@ struct pinctrl_pin_desc;
>   * @intr_status_bit:      Offset in @intr_status_reg for reading and acking the interrupt
>   *                        status.
>   * @intr_target_bit:      Offset in @intr_target_reg for configuring the interrupt routing.
> + * @intr_target_width:    Number of bits used for specifying interrupt routing target.
>   * @intr_target_kpss_val: Value in @intr_target_bit for specifying that the interrupt from
>   *                        this gpio should get routed to the KPSS processor.
>   * @intr_raw_status_bit:  Offset in @intr_cfg_reg for the raw status bit.
> @@ -100,6 +101,7 @@ struct msm_pingroup {
>  	unsigned intr_ack_high:1;
>  
>  	unsigned intr_target_bit:5;
> +	unsigned intr_target_width:5;
>  	unsigned intr_target_kpss_val:5;
>  	unsigned intr_raw_status_bit:5;
>  	unsigned intr_polarity_bit:5;
> diff --git a/drivers/pinctrl/qcom/pinctrl-sa8775p.c b/drivers/pinctrl/qcom/pinctrl-sa8775p.c
> index 8a5cd15512b9..8fdea25d8d67 100644
> --- a/drivers/pinctrl/qcom/pinctrl-sa8775p.c
> +++ b/drivers/pinctrl/qcom/pinctrl-sa8775p.c
> @@ -46,6 +46,7 @@
>  		.intr_enable_bit = 0,		\
>  		.intr_status_bit = 0,		\
>  		.intr_target_bit = 5,		\
> +		.intr_target_width = 4,		\
>  		.intr_target_kpss_val = 3,	\
>  		.intr_raw_status_bit = 4,	\
>  		.intr_polarity_bit = 1,		\