summaryrefslogtreecommitdiffstats
path: root/drivers/i2c
diff options
context:
space:
mode:
authorShubhrajyoti Datta <shubhraj@xilinx.com>2015-06-17 20:48:12 +0530
committerWolfram Sang <wsa@the-dreams.de>2015-08-10 08:37:31 +0200
commitfcc2fac60a95b4e63682ae4128e86d8768602fab (patch)
treeae6dd74ee3816b45e8df8f4dd73376c60595701c /drivers/i2c
parent0387fc1645fed3b723e8556d83452bc09f79fd24 (diff)
downloadlinux-fcc2fac60a95b4e63682ae4128e86d8768602fab.tar.bz2
i2c: xiic: move the xiic_process to thread context
The xiic_process is a 154 line code that runs in isr context currently move it to thread context. Also the name xiic_process suggests that the intension was to run in process context. Signed-off-by: Shubhrajyoti Datta <shubhraj@xilinx.com> [wsa: initialized irqreturn_t to IRQ_NONE instead of IRQ_HANDLED] Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Diffstat (limited to 'drivers/i2c')
-rw-r--r--drivers/i2c/busses/i2c-xiic.c33
1 files changed, 20 insertions, 13 deletions
diff --git a/drivers/i2c/busses/i2c-xiic.c b/drivers/i2c/busses/i2c-xiic.c
index 912780a3a65e..3664dffdcab7 100644
--- a/drivers/i2c/busses/i2c-xiic.c
+++ b/drivers/i2c/busses/i2c-xiic.c
@@ -358,8 +358,9 @@ static void xiic_wakeup(struct xiic_i2c *i2c, int code)
wake_up(&i2c->wait);
}
-static void xiic_process(struct xiic_i2c *i2c)
+static irqreturn_t xiic_process(int irq, void *dev_id)
{
+ struct xiic_i2c *i2c = dev_id;
u32 pend, isr, ier;
u32 clr = 0;
@@ -368,6 +369,7 @@ static void xiic_process(struct xiic_i2c *i2c)
* To find which interrupts are pending; AND interrupts pending with
* interrupts masked.
*/
+ spin_lock(&i2c->lock);
isr = xiic_getreg32(i2c, XIIC_IISR_OFFSET);
ier = xiic_getreg32(i2c, XIIC_IIER_OFFSET);
pend = isr & ier;
@@ -378,11 +380,6 @@ static void xiic_process(struct xiic_i2c *i2c)
__func__, xiic_getreg8(i2c, XIIC_SR_REG_OFFSET),
i2c->tx_msg, i2c->nmsgs);
- /* Do not processes a devices interrupts if the device has no
- * interrupts pending
- */
- if (!pend)
- return;
/* Service requesting interrupt */
if ((pend & XIIC_INTR_ARB_LOST_MASK) ||
@@ -502,6 +499,8 @@ out:
dev_dbg(i2c->adap.dev.parent, "%s clr: 0x%x\n", __func__, clr);
xiic_setreg32(i2c, XIIC_IISR_OFFSET, clr);
+ spin_unlock(&i2c->lock);
+ return IRQ_HANDLED;
}
static int xiic_bus_busy(struct xiic_i2c *i2c)
@@ -602,16 +601,21 @@ static void xiic_start_send(struct xiic_i2c *i2c)
static irqreturn_t xiic_isr(int irq, void *dev_id)
{
struct xiic_i2c *i2c = dev_id;
-
- spin_lock(&i2c->lock);
+ u32 pend, isr, ier;
+ irqreturn_t ret = IRQ_NONE;
+ /* Do not processes a devices interrupts if the device has no
+ * interrupts pending
+ */
dev_dbg(i2c->adap.dev.parent, "%s entry\n", __func__);
- xiic_process(i2c);
-
- spin_unlock(&i2c->lock);
+ isr = xiic_getreg32(i2c, XIIC_IISR_OFFSET);
+ ier = xiic_getreg32(i2c, XIIC_IIER_OFFSET);
+ pend = isr & ier;
+ if (pend)
+ ret = IRQ_WAKE_THREAD;
- return IRQ_HANDLED;
+ return ret;
}
static void __xiic_start_xfer(struct xiic_i2c *i2c)
@@ -752,7 +756,10 @@ static int xiic_i2c_probe(struct platform_device *pdev)
spin_lock_init(&i2c->lock);
init_waitqueue_head(&i2c->wait);
- ret = devm_request_irq(&pdev->dev, irq, xiic_isr, 0, pdev->name, i2c);
+ ret = devm_request_threaded_irq(&pdev->dev, irq, xiic_isr,
+ xiic_process, IRQF_ONESHOT,
+ pdev->name, i2c);
+
if (ret < 0) {
dev_err(&pdev->dev, "Cannot claim IRQ\n");
return ret;