linux-kernel - [PATCH v2 2/2] pinctrl: rockchip: Fix enable/disable/mask/unmask

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Date:	Wed, 19 Nov 2014 14:51:33 -0800
From:	Doug Anderson <dianders@...omium.org>
To:	Heiko Stuebner <heiko@...ech.de>,
	Linus Walleij <linus.walleij@...aro.org>
Cc:	Sonny Rao <sonnyrao@...omium.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Chris Zhong <zyw@...k-chips.com>,
	linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org,
	Doug Anderson <dianders@...omium.org>,
	linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 2/2] pinctrl: rockchip: Fix enable/disable/mask/unmask

The Rockchip pinctrl driver was only implementing the "mask" and
"unmask" operations though the hardware actually has two distinct
things: enable/disable and mask/unmask.  It was implementing the
"mask" operations as a hardware enable/disable and always leaving all
interrupts unmasked.

I believe that the old system had some downsides, specifically:
- (Untested) if an interrupt went off while interrupts were "masked"
  it would be lost.  Now it will be kept track of.
- If someone wanted to change an interrupt back into a GPIO (is such a
  thing sensible?) by calling irq_disable() it wouldn't actually take
  effect.  That's because Linux does some extra optimizations when
  there's no true "disable" function: it does a lazy mask.

Let's actually implement enable/disable/mask/unmask properly.

Signed-off-by: Doug Anderson <dianders@...omium.org>
Reviewed-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
Reviewed-by: Heiko Stuebner <heiko@...ech.de>
---
Changes in v2:
- Spread out code (heiko)

 drivers/pinctrl/pinctrl-rockchip.c | 36 +++++++++++++++++++++++++++++++++---
 1 file changed, 33 insertions(+), 3 deletions(-)

diff --git a/drivers/pinctrl/pinctrl-rockchip.c b/drivers/pinctrl/pinctrl-rockchip.c
index e91e845..3c22dbe 100644
--- a/drivers/pinctrl/pinctrl-rockchip.c
+++ b/drivers/pinctrl/pinctrl-rockchip.c
@@ -1562,6 +1562,34 @@ static void rockchip_irq_resume(struct irq_data *d)
 	irq_reg_writel(gc, bank->saved_enables, GPIO_INTEN);
 }
 
+static void rockchip_irq_disable(struct irq_data *d)
+{
+	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
+	u32 val;
+
+	irq_gc_lock(gc);
+
+	val = irq_reg_readl(gc, GPIO_INTEN);
+	val &= ~d->mask;
+	irq_reg_writel(gc, val, GPIO_INTEN);
+
+	irq_gc_unlock(gc);
+}
+
+static void rockchip_irq_enable(struct irq_data *d)
+{
+	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
+	u32 val;
+
+	irq_gc_lock(gc);
+
+	val = irq_reg_readl(gc, GPIO_INTEN);
+	val |= d->mask;
+	irq_reg_writel(gc, val, GPIO_INTEN);
+
+	irq_gc_unlock(gc);
+}
+
 static int rockchip_interrupts_register(struct platform_device *pdev,
 						struct rockchip_pinctrl *info)
 {
@@ -1600,11 +1628,13 @@ static int rockchip_interrupts_register(struct platform_device *pdev,
 		gc = irq_get_domain_generic_chip(bank->domain, 0);
 		gc->reg_base = bank->reg_base;
 		gc->private = bank;
-		gc->chip_types[0].regs.mask = GPIO_INTEN;
+		gc->chip_types[0].regs.mask = GPIO_INTMASK;
 		gc->chip_types[0].regs.ack = GPIO_PORTS_EOI;
 		gc->chip_types[0].chip.irq_ack = irq_gc_ack_set_bit;
-		gc->chip_types[0].chip.irq_mask = irq_gc_mask_clr_bit;
-		gc->chip_types[0].chip.irq_unmask = irq_gc_mask_set_bit;
+		gc->chip_types[0].chip.irq_mask = irq_gc_mask_set_bit;
+		gc->chip_types[0].chip.irq_unmask = irq_gc_mask_clr_bit;
+		gc->chip_types[0].chip.irq_enable = rockchip_irq_enable;
+		gc->chip_types[0].chip.irq_disable = rockchip_irq_disable;
 		gc->chip_types[0].chip.irq_set_wake = irq_gc_set_wake;
 		gc->chip_types[0].chip.irq_suspend = rockchip_irq_suspend;
 		gc->chip_types[0].chip.irq_resume = rockchip_irq_resume;
-- 
2.1.0.rc2.206.gedb03e5

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