linux-kernel - [PATCH v4] pinctrl: intel: refine ->irq_set

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Date:   Thu, 15 Jun 2023 18:20:22 +0530
From:   Raag Jadav <raag.jadav@...el.com>
To:     linus.walleij@...aro.org, mika.westerberg@...ux.intel.com,
        andriy.shevchenko@...ux.intel.com
Cc:     linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        mallikarjunappa.sangannavar@...el.com, pandith.n@...el.com,
        Raag Jadav <raag.jadav@...el.com>
Subject: [PATCH v4] pinctrl: intel: refine ->irq_set_type() hook

Refine ->irq_set_type() hook and improve its readability by:

- Reducing scope of spinlock by moving unneeded operations out of it.
- Dropping redundant PADCFG0_RXEVCFG_SHIFT and including it directly
  into PADCFG0_RXEVCFG_* definitions.
- Utilizing temporary variables for common operations.
- Simplifying if-else-if chain.

Signed-off-by: Raag Jadav <raag.jadav@...el.com>
---
 drivers/pinctrl/intel/pinctrl-intel.c | 45 ++++++++++++++-------------
 1 file changed, 24 insertions(+), 21 deletions(-)

diff --git a/drivers/pinctrl/intel/pinctrl-intel.c b/drivers/pinctrl/intel/pinctrl-intel.c
index e8adf2580321..036eae74c479 100644
--- a/drivers/pinctrl/intel/pinctrl-intel.c
+++ b/drivers/pinctrl/intel/pinctrl-intel.c
@@ -55,12 +55,11 @@
 
 /* Offset from pad_regs */
 #define PADCFG0				0x000
-#define PADCFG0_RXEVCFG_SHIFT		25
 #define PADCFG0_RXEVCFG_MASK		GENMASK(26, 25)
-#define PADCFG0_RXEVCFG_LEVEL		0
-#define PADCFG0_RXEVCFG_EDGE		1
-#define PADCFG0_RXEVCFG_DISABLED	2
-#define PADCFG0_RXEVCFG_EDGE_BOTH	3
+#define PADCFG0_RXEVCFG_LEVEL		(0 << 25)
+#define PADCFG0_RXEVCFG_EDGE		(1 << 25)
+#define PADCFG0_RXEVCFG_DISABLED	(2 << 25)
+#define PADCFG0_RXEVCFG_EDGE_BOTH	(3 << 25)
 #define PADCFG0_PREGFRXSEL		BIT(24)
 #define PADCFG0_RXINV			BIT(23)
 #define PADCFG0_GPIROUTIOXAPIC		BIT(20)
@@ -1127,9 +1126,9 @@ static int intel_gpio_irq_type(struct irq_data *d, unsigned int type)
 	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 	struct intel_pinctrl *pctrl = gpiochip_get_data(gc);
 	unsigned int pin = intel_gpio_to_pin(pctrl, irqd_to_hwirq(d), NULL, NULL);
+	u32 rxevcfg, rxinv, value;
 	unsigned long flags;
 	void __iomem *reg;
-	u32 value;
 
 	reg = intel_get_padcfg(pctrl, pin, PADCFG0);
 	if (!reg)
@@ -1145,28 +1144,32 @@ static int intel_gpio_irq_type(struct irq_data *d, unsigned int type)
 		return -EPERM;
 	}
 
-	raw_spin_lock_irqsave(&pctrl->lock, flags);
-
-	intel_gpio_set_gpio_mode(reg);
-
-	value = readl(reg);
-
-	value &= ~(PADCFG0_RXEVCFG_MASK | PADCFG0_RXINV);
-
 	if ((type & IRQ_TYPE_EDGE_BOTH) == IRQ_TYPE_EDGE_BOTH) {
-		value |= PADCFG0_RXEVCFG_EDGE_BOTH << PADCFG0_RXEVCFG_SHIFT;
+		rxevcfg = PADCFG0_RXEVCFG_EDGE_BOTH;
 	} else if (type & IRQ_TYPE_EDGE_FALLING) {
-		value |= PADCFG0_RXEVCFG_EDGE << PADCFG0_RXEVCFG_SHIFT;
-		value |= PADCFG0_RXINV;
+		rxevcfg = PADCFG0_RXEVCFG_EDGE;
 	} else if (type & IRQ_TYPE_EDGE_RISING) {
-		value |= PADCFG0_RXEVCFG_EDGE << PADCFG0_RXEVCFG_SHIFT;
+		rxevcfg = PADCFG0_RXEVCFG_EDGE;
 	} else if (type & IRQ_TYPE_LEVEL_MASK) {
-		if (type & IRQ_TYPE_LEVEL_LOW)
-			value |= PADCFG0_RXINV;
+		rxevcfg = PADCFG0_RXEVCFG_LEVEL;
 	} else {
-		value |= PADCFG0_RXEVCFG_DISABLED << PADCFG0_RXEVCFG_SHIFT;
+		rxevcfg = PADCFG0_RXEVCFG_DISABLED;
 	}
 
+	if (type == IRQ_TYPE_EDGE_FALLING || type == IRQ_TYPE_LEVEL_LOW)
+		rxinv = PADCFG0_RXINV;
+	else
+		rxinv = 0;
+
+	raw_spin_lock_irqsave(&pctrl->lock, flags);
+
+	intel_gpio_set_gpio_mode(reg);
+
+	value = readl(reg);
+
+	value = (value & ~PADCFG0_RXINV) | rxinv;
+	value = (value & ~PADCFG0_RXEVCFG_MASK) | rxevcfg;
+
 	writel(value, reg);
 
 	if (type & IRQ_TYPE_EDGE_BOTH)

base-commit: e95433c367e681dc6d4613706bd74f483a25acd8
-- 
2.17.1