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pinctrl: stm32: Do not call stm32_gpio_get() for edge triggered IRQs in EOI

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[ Upstream commit e74200ebf7 ]

The stm32_gpio_get() should only be called for LEVEL triggered interrupts,
skip calling it for EDGE triggered interrupts altogether to avoid wasting
CPU cycles in EOI handler. On this platform, EDGE triggered interrupts are
the majority and LEVEL triggered interrupts are the exception no less, and
the CPU cycles are not abundant.

Fixes: 47beed513a ("pinctrl: stm32: Add level interrupt support to gpio irq chip")
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Alexandre Torgue <alexandre.torgue@foss.st.com>
Cc: Fabien Dessenne <fabien.dessenne@foss.st.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Marc Zyngier <maz@kernel.org>
Cc: linux-stm32@st-md-mailman.stormreply.com
Cc: linux-arm-kernel@lists.infradead.org
To: linux-gpio@vger.kernel.org
Link: https://lore.kernel.org/r/20220415215410.498349-1-marex@denx.de
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Marek Vasut 2022-04-15 23:54:10 +02:00 • committed by Justin Hammond
parent f420e86e00
commit 3cfdaa8842
1 changed files with 4 additions and 0 deletions
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4
drivers/pinctrl/stm32/pinctrl-stm32.c
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@ -311,6 +311,10 @@ static void stm32_gpio_irq_trigger(struct irq_data *d)
struct stm32_gpio_bank *bank = d->domain->host_data;
int level;
/* Do not access the GPIO if this is not LEVEL triggered IRQ. */
if (!(bank->irq_type[d->hwirq] & IRQ_TYPE_LEVEL_MASK))
return;
/* If level interrupt type then retrig */
level = stm32_gpio_get(&bank->gpio_chip, d->hwirq);
if ((level == 0 && bank->irq_type[d->hwirq] == IRQ_TYPE_LEVEL_LOW) ||