linux-kernel - [PATCH v1 2/4] pinctrl: intel: optimize irq_set

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Date:   Thu,  8 Jun 2023 12:30:15 +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 v1 2/4] pinctrl: intel: optimize irq_set_type hook

Utilize a temporary variable for common shift operation
inside ->irq_set_type() hook and save a few bytes.
While at it, simplify if-else-if chain.

add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-16 (-16)
Function                                     old     new   delta
intel_gpio_irq_type                          317     301     -16
Total: Before=10469, After=10453, chg -0.15%

Signed-off-by: Raag Jadav <raag.jadav@...el.com>
---
 drivers/pinctrl/intel/pinctrl-intel.c | 19 ++++++++++---------
 1 file changed, 10 insertions(+), 9 deletions(-)

diff --git a/drivers/pinctrl/intel/pinctrl-intel.c b/drivers/pinctrl/intel/pinctrl-intel.c
index e8adf2580321..3f78066b1837 100644
--- a/drivers/pinctrl/intel/pinctrl-intel.c
+++ b/drivers/pinctrl/intel/pinctrl-intel.c
@@ -1128,8 +1128,8 @@ static int intel_gpio_irq_type(struct irq_data *d, unsigned int type)
 	struct intel_pinctrl *pctrl = gpiochip_get_data(gc);
 	unsigned int pin = intel_gpio_to_pin(pctrl, irqd_to_hwirq(d), NULL, NULL);
 	unsigned long flags;
+	u32 value, rxevcfg;
 	void __iomem *reg;
-	u32 value;
 
 	reg = intel_get_padcfg(pctrl, pin, PADCFG0);
 	if (!reg)
@@ -1150,23 +1150,24 @@ static int intel_gpio_irq_type(struct irq_data *d, unsigned int type)
 	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)
+		value |= PADCFG0_RXINV;
+
+	value |= rxevcfg << PADCFG0_RXEVCFG_SHIFT;
 	writel(value, reg);
 
 	if (type & IRQ_TYPE_EDGE_BOTH)
-- 
2.17.1