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authorMark Brown <broonie@opensource.wolfsonmicro.com>2011-07-20 20:05:13 +0400
committerSamuel Ortiz <sameo@linux.intel.com>2011-08-01 01:28:27 +0400
commit88c939770db375244b00ba92e901fa92677a7164 (patch)
tree44295486ea66c6aee832a3602b600e777e5107fc /drivers/mfd
parentb1224cd113d4441edee4a58a1e2e428141247c0d (diff)
downloadlinux-88c939770db375244b00ba92e901fa92677a7164.tar.xz
mfd: Acknowlege all WM831x IRQs before we handle them
Ensure that we never have a window where we've handled an interrupt (and therefore need to be notified of new events) but haven't yet told the interrupt controller that this is the case (so any new events will be discarded). Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Diffstat (limited to 'drivers/mfd')
-rw-r--r--drivers/mfd/wm831x-irq.c30
1 files changed, 13 insertions, 17 deletions
diff --git a/drivers/mfd/wm831x-irq.c b/drivers/mfd/wm831x-irq.c
index 6c3408ca2c2d..ada1835a5455 100644
--- a/drivers/mfd/wm831x-irq.c
+++ b/drivers/mfd/wm831x-irq.c
@@ -449,7 +449,7 @@ static irqreturn_t wm831x_irq_thread(int irq, void *data)
{
struct wm831x *wm831x = data;
unsigned int i;
- int primary;
+ int primary, status_addr;
int status_regs[WM831X_NUM_IRQ_REGS] = { 0 };
int read[WM831X_NUM_IRQ_REGS] = { 0 };
int *status;
@@ -484,8 +484,9 @@ static irqreturn_t wm831x_irq_thread(int irq, void *data)
/* Hopefully there should only be one register to read
* each time otherwise we ought to do a block read. */
if (!read[offset]) {
- *status = wm831x_reg_read(wm831x,
- irq_data_to_status_reg(&wm831x_irqs[i]));
+ status_addr = irq_data_to_status_reg(&wm831x_irqs[i]);
+
+ *status = wm831x_reg_read(wm831x, status_addr);
if (*status < 0) {
dev_err(wm831x->dev,
"Failed to read IRQ status: %d\n",
@@ -494,26 +495,21 @@ static irqreturn_t wm831x_irq_thread(int irq, void *data)
}
read[offset] = 1;
+
+ /* Ignore any bits that we don't think are masked */
+ *status &= ~wm831x->irq_masks_cur[offset];
+
+ /* Acknowledge now so we don't miss
+ * notifications while we handle.
+ */
+ wm831x_reg_write(wm831x, status_addr, *status);
}
- /* Report it if it isn't masked, or forget the status. */
- if ((*status & ~wm831x->irq_masks_cur[offset])
- & wm831x_irqs[i].mask)
+ if (*status & wm831x_irqs[i].mask)
handle_nested_irq(wm831x->irq_base + i);
- else
- *status &= ~wm831x_irqs[i].mask;
}
out:
- /* Touchscreen interrupts are handled specially in the driver */
- status_regs[0] &= ~(WM831X_TCHDATA_EINT | WM831X_TCHPD_EINT);
-
- for (i = 0; i < ARRAY_SIZE(status_regs); i++) {
- if (status_regs[i])
- wm831x_reg_write(wm831x, WM831X_INTERRUPT_STATUS_1 + i,
- status_regs[i]);
- }
-
return IRQ_HANDLED;
}