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authorSebastian Andrzej Siewior <bigeasy@linutronix.de>2013-10-02 18:45:25 +0400
committerMark Brown <broonie@linaro.org>2013-10-07 14:29:22 +0400
commit3b3a80019ff194e86e740ec2f013a8915efd1ccf (patch)
tree77302f92a25ec4ebadfea270c00572d7592d8d8a /drivers/spi/spi-ti-qspi.c
parent633795b992ebae2a78890c0cfa5c17058eb93817 (diff)
downloadlinux-3b3a80019ff194e86e740ec2f013a8915efd1ccf.tar.xz
spi: ti-qspi: one only one interrupt handler
The here used irq and threaded irq handler is a complete non-sense. After the status register is read and the source disabled it schedules a thread (the irq thread) to read the status from the variable, invoke complete() and then renable the interrupt. Again: schedule a thread which invokes _only_ complete(). This patch removes this non-sense and we remain with one handler which invokes complete() if needed. The device remove path should now disable the interupts. This has been compile time tested. Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Tested-by: Sourav Poddar <sourav.poddar@ti.com> Signed-off-by: Mark Brown <broonie@linaro.org>
Diffstat (limited to 'drivers/spi/spi-ti-qspi.c')
-rw-r--r--drivers/spi/spi-ti-qspi.c39
1 files changed, 6 insertions, 33 deletions
diff --git a/drivers/spi/spi-ti-qspi.c b/drivers/spi/spi-ti-qspi.c
index 7a45c3e665f8..a61aeb9bb823 100644
--- a/drivers/spi/spi-ti-qspi.c
+++ b/drivers/spi/spi-ti-qspi.c
@@ -41,9 +41,6 @@ struct ti_qspi_regs {
struct ti_qspi {
struct completion transfer_complete;
- /* IRQ synchronization */
- spinlock_t lock;
-
/* list synchronization */
struct mutex list_lock;
@@ -57,7 +54,6 @@ struct ti_qspi {
u32 spi_max_frequency;
u32 cmd;
u32 dc;
- u32 stat;
};
#define QSPI_PID (0x0)
@@ -397,13 +393,12 @@ static irqreturn_t ti_qspi_isr(int irq, void *dev_id)
{
struct ti_qspi *qspi = dev_id;
u16 int_stat;
+ u32 stat;
irqreturn_t ret = IRQ_HANDLED;
- spin_lock(&qspi->lock);
-
int_stat = ti_qspi_read(qspi, QSPI_INTR_STATUS_ENABLED_CLEAR);
- qspi->stat = ti_qspi_read(qspi, QSPI_SPI_STATUS_REG);
+ stat = ti_qspi_read(qspi, QSPI_SPI_STATUS_REG);
if (!int_stat) {
dev_dbg(qspi->dev, "No IRQ triggered\n");
@@ -411,35 +406,14 @@ static irqreturn_t ti_qspi_isr(int irq, void *dev_id)
goto out;
}
- ret = IRQ_WAKE_THREAD;
-
- ti_qspi_write(qspi, QSPI_WC_INT_DISABLE, QSPI_INTR_ENABLE_CLEAR_REG);
ti_qspi_write(qspi, QSPI_WC_INT_DISABLE,
QSPI_INTR_STATUS_ENABLED_CLEAR);
-
+ if (stat & WC)
+ complete(&qspi->transfer_complete);
out:
- spin_unlock(&qspi->lock);
-
return ret;
}
-static irqreturn_t ti_qspi_threaded_isr(int this_irq, void *dev_id)
-{
- struct ti_qspi *qspi = dev_id;
- unsigned long flags;
-
- spin_lock_irqsave(&qspi->lock, flags);
-
- if (qspi->stat & WC)
- complete(&qspi->transfer_complete);
-
- spin_unlock_irqrestore(&qspi->lock, flags);
-
- ti_qspi_write(qspi, QSPI_WC_INT_EN, QSPI_INTR_ENABLE_SET_REG);
-
- return IRQ_HANDLED;
-}
-
static int ti_qspi_runtime_resume(struct device *dev)
{
struct ti_qspi *qspi;
@@ -499,7 +473,6 @@ static int ti_qspi_probe(struct platform_device *pdev)
return irq;
}
- spin_lock_init(&qspi->lock);
mutex_init(&qspi->list_lock);
qspi->base = devm_ioremap_resource(&pdev->dev, r);
@@ -508,8 +481,7 @@ static int ti_qspi_probe(struct platform_device *pdev)
goto free_master;
}
- ret = devm_request_threaded_irq(&pdev->dev, irq, ti_qspi_isr,
- ti_qspi_threaded_isr, 0,
+ ret = devm_request_irq(&pdev->dev, irq, ti_qspi_isr, 0,
dev_name(&pdev->dev), qspi);
if (ret < 0) {
dev_err(&pdev->dev, "Failed to register ISR for IRQ %d\n",
@@ -547,6 +519,7 @@ static int ti_qspi_remove(struct platform_device *pdev)
{
struct ti_qspi *qspi = platform_get_drvdata(pdev);
+ ti_qspi_write(qspi, QSPI_WC_INT_DISABLE, QSPI_INTR_ENABLE_CLEAR_REG);
spi_unregister_master(qspi->master);
return 0;