[PATCH AUTOSEL 5.19 05/16] gpio: ixp4xx: Make irqchip immutable

[PATCH AUTOSEL 5.19 05/16] gpio: ixp4xx: Make irqchip immutable

[Sasha Levin]

From: Linus Walleij <linus.walleij@linaro.org>

[ Upstream commit 94e9bc73d85aa6ecfe249e985ff57abe0ab35f34 ]

This turns the IXP4xx GPIO irqchip into an immutable
irqchip, a bit different from the standard template due
to being hierarchical.

Tested on the IXP4xx which uses drivers/ata/pata_ixp4xx_cf.c
for a rootfs on compact flash with IRQs from this GPIO
block to the CF ATA controller.

Cc: Marc Zyngier <maz@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/gpio/gpio-ixp4xx.c | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/drivers/gpio/gpio-ixp4xx.c b/drivers/gpio/gpio-ixp4xx.c
index 312309be0287..56656fb519f8 100644
--- a/drivers/gpio/gpio-ixp4xx.c
+++ b/drivers/gpio/gpio-ixp4xx.c
@@ -63,6 +63,14 @@ static void ixp4xx_gpio_irq_ack(struct irq_data *d)
 	__raw_writel(BIT(d->hwirq), g->base + IXP4XX_REG_GPIS);
 }
 
+static void ixp4xx_gpio_mask_irq(struct irq_data *d)
+{
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+
+	irq_chip_mask_parent(d);
+	gpiochip_disable_irq(gc, d->hwirq);
+}
+
 static void ixp4xx_gpio_irq_unmask(struct irq_data *d)
 {
 	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
@@ -72,6 +80,7 @@ static void ixp4xx_gpio_irq_unmask(struct irq_data *d)
 	if (!(g->irq_edge & BIT(d->hwirq)))
 		ixp4xx_gpio_irq_ack(d);
 
+	gpiochip_enable_irq(gc, d->hwirq);
 	irq_chip_unmask_parent(d);
 }
 
@@ -149,12 +158,14 @@ static int ixp4xx_gpio_irq_set_type(struct irq_data *d, unsigned int type)
 	return irq_chip_set_type_parent(d, IRQ_TYPE_LEVEL_HIGH);
 }
 
-static struct irq_chip ixp4xx_gpio_irqchip = {
+static const struct irq_chip ixp4xx_gpio_irqchip = {
 	.name = "IXP4GPIO",
 	.irq_ack = ixp4xx_gpio_irq_ack,
-	.irq_mask = irq_chip_mask_parent,
+	.irq_mask = ixp4xx_gpio_mask_irq,
 	.irq_unmask = ixp4xx_gpio_irq_unmask,
 	.irq_set_type = ixp4xx_gpio_irq_set_type,
+	.flags = IRQCHIP_IMMUTABLE,
+	GPIOCHIP_IRQ_RESOURCE_HELPERS,
 };
 
 static int ixp4xx_gpio_child_to_parent_hwirq(struct gpio_chip *gc,
@@ -263,7 +274,7 @@ static int ixp4xx_gpio_probe(struct platform_device *pdev)
 	g->gc.owner = THIS_MODULE;
 
 	girq = &g->gc.irq;
-	girq->chip = &ixp4xx_gpio_irqchip;
+	gpio_irq_chip_set_chip(girq, &ixp4xx_gpio_irqchip);
 	girq->fwnode = g->fwnode;
 	girq->parent_domain = parent;
 	girq->child_to_parent_hwirq = ixp4xx_gpio_child_to_parent_hwirq;
-- 
2.35.1

[PATCH AUTOSEL 5.19 16/16] gpio: mt7621: Make the irqchip immutable

[Sasha Levin]

From: Sergio Paracuellos <sergio.paracuellos@gmail.com>

[ Upstream commit 09eed5a1ed3c752892663976837eb4244c2f1984 ]

Commit 6c846d026d49 ("gpio: Don't fiddle with irqchips marked as
immutable") added a warning to indicate if the gpiolib is altering the
internals of irqchips.  Following this change the following warnings
are now observed for the mt7621 driver:

gpio gpiochip0: (1e000600.gpio-bank0): not an immutable chip, please consider fixing it!
gpio gpiochip1: (1e000600.gpio-bank1): not an immutable chip, please consider fixing it!
gpio gpiochip2: (1e000600.gpio-bank2): not an immutable chip, please consider fixing it!

Fix this by making the irqchip in the mt7621 driver immutable.

Tested-by: Arınç ÜNAL <arinc.unal@arinc9.com>
Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/gpio/gpio-mt7621.c | 21 +++++++++++++++------
 1 file changed, 15 insertions(+), 6 deletions(-)

diff --git a/drivers/gpio/gpio-mt7621.c b/drivers/gpio/gpio-mt7621.c
index d8a26e503ca5..f163f5ca857b 100644
--- a/drivers/gpio/gpio-mt7621.c
+++ b/drivers/gpio/gpio-mt7621.c
@@ -112,6 +112,8 @@ mediatek_gpio_irq_unmask(struct irq_data *d)
 	unsigned long flags;
 	u32 rise, fall, high, low;
 
+	gpiochip_enable_irq(gc, d->hwirq);
+
 	spin_lock_irqsave(&rg->lock, flags);
 	rise = mtk_gpio_r32(rg, GPIO_REG_REDGE);
 	fall = mtk_gpio_r32(rg, GPIO_REG_FEDGE);
@@ -143,6 +145,8 @@ mediatek_gpio_irq_mask(struct irq_data *d)
 	mtk_gpio_w32(rg, GPIO_REG_HLVL, high & ~BIT(pin));
 	mtk_gpio_w32(rg, GPIO_REG_LLVL, low & ~BIT(pin));
 	spin_unlock_irqrestore(&rg->lock, flags);
+
+	gpiochip_disable_irq(gc, d->hwirq);
 }
 
 static int
@@ -204,6 +208,16 @@ mediatek_gpio_xlate(struct gpio_chip *chip,
 	return gpio % MTK_BANK_WIDTH;
 }
 
+static const struct irq_chip mt7621_irq_chip = {
+	.name		= "mt7621-gpio",
+	.irq_mask_ack	= mediatek_gpio_irq_mask,
+	.irq_mask	= mediatek_gpio_irq_mask,
+	.irq_unmask	= mediatek_gpio_irq_unmask,
+	.irq_set_type	= mediatek_gpio_irq_type,
+	.flags		= IRQCHIP_IMMUTABLE,
+	GPIOCHIP_IRQ_RESOURCE_HELPERS,
+};
+
 static int
 mediatek_gpio_bank_probe(struct device *dev, int bank)
 {
@@ -238,11 +252,6 @@ mediatek_gpio_bank_probe(struct device *dev, int bank)
 		return -ENOMEM;
 
 	rg->chip.offset = bank * MTK_BANK_WIDTH;
-	rg->irq_chip.name = dev_name(dev);
-	rg->irq_chip.irq_unmask = mediatek_gpio_irq_unmask;
-	rg->irq_chip.irq_mask = mediatek_gpio_irq_mask;
-	rg->irq_chip.irq_mask_ack = mediatek_gpio_irq_mask;
-	rg->irq_chip.irq_set_type = mediatek_gpio_irq_type;
 
 	if (mtk->gpio_irq) {
 		struct gpio_irq_chip *girq;
@@ -262,7 +271,7 @@ mediatek_gpio_bank_probe(struct device *dev, int bank)
 		}
 
 		girq = &rg->chip.irq;
-		girq->chip = &rg->irq_chip;
+		gpio_irq_chip_set_chip(girq, &mt7621_irq_chip);
 		/* This will let us handle the parent IRQ in the driver */
 		girq->parent_handler = NULL;
 		girq->num_parents = 0;
-- 
2.35.1