linux-kernel - [PATCH v2] mfd: db8500-prcmu: fix irqdomain usage

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Date:	Thu, 20 Dec 2012 10:20:15 +0100
From:	Linus Walleij <linus.walleij@...ricsson.com>
To:	Samuel Ortiz <sameo@...ux.intel.com>,
	<linux-kernel@...r.kernel.org>
Cc:	Anmar Oueja <anmar.oueja@...aro.org>,
	Linus Walleij <linus.walleij@...aro.org>, <stable@...nel.org>,
	Lee Jones <lee.jones@...aro.org>
Subject: [PATCH v2] mfd: db8500-prcmu: fix irqdomain usage

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

This fixes two issues with the DB8500 PRCMU irqdomain:
- You have to state the irq base 0 to get a linear domain
  for the DT case from irq_domain_add_simple()
- The irqdomain was not used to translate the initial irq
  request using irq_create_mapping() making the linear
  case fail as it was lacking a proper descriptor.

I took this opportunity to fix two lines of whitespace
errors in related code as I was anyway messing around with
it.

Cc: stable@...nel.org
Cc: Lee Jones <lee.jones@...aro.org>
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
---
ChangeLog v1->v2:
- Fix smallish whitespace error
- Make sure not to call irq_create_mapping() in the fastpath,
  instead, right after creating the irqdomain call that
  for each wakeup source, and use irq_find_mapping() in
  fastpath.

Hi Sam, this is a regression and as such should go into the
-rc series. As you can see I also added the Cc: stable tag.

Yours,
Linus Walleij
---
 drivers/mfd/db8500-prcmu.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/drivers/mfd/db8500-prcmu.c b/drivers/mfd/db8500-prcmu.c
index dc8826d..268f45d 100644
--- a/drivers/mfd/db8500-prcmu.c
+++ b/drivers/mfd/db8500-prcmu.c
@@ -2524,7 +2524,7 @@ static bool read_mailbox_0(void)
 
 		for (n = 0; n < NUM_PRCMU_WAKEUPS; n++) {
 			if (ev & prcmu_irq_bit[n])
-				generic_handle_irq(IRQ_PRCMU_BASE + n);
+				generic_handle_irq(irq_find_mapping(db8500_irq_domain, n));
 		}
 		r = true;
 		break;
@@ -2737,13 +2737,14 @@ static int db8500_irq_map(struct irq_domain *d, unsigned int virq,
 }
 
 static struct irq_domain_ops db8500_irq_ops = {
-        .map    = db8500_irq_map,
-        .xlate  = irq_domain_xlate_twocell,
+	.map    = db8500_irq_map,
+	.xlate  = irq_domain_xlate_twocell,
 };
 
 static int db8500_irq_init(struct device_node *np)
 {
-	int irq_base = -1;
+	int irq_base = 0;
+	int i;
 
 	/* In the device tree case, just take some IRQs */
 	if (!np)
@@ -2758,6 +2759,10 @@ static int db8500_irq_init(struct device_node *np)
 		return -ENOSYS;
 	}
 
+	/* All wakeups will be used, so create mappings for all */
+	for (i = 0; i < NUM_PRCMU_WAKEUPS; i++)
+		irq_create_mapping(db8500_irq_domain, i);
+
 	return 0;
 }
 
-- 
1.7.11.3

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