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[v2,2/8] spi: lantiq: Add SMP support

Message ID d6663296b41f102c582fda08e71f62b72ca05d5d.1594957019.git.eswara.kota@linux.intel.com
State Accepted
Commit ddf41bf782d2fb1df605407c7fff1160f488c949
Headers show
Series [v2,1/8] spi: lantiq: fix: Rx overflow error in full duplex mode | expand

Commit Message

Dilip Kota July 17, 2020, 6:27 a.m. UTC
Existing driver supports only single core SoC. New multicore platforms uses
the same driver/IP so SMP support is required. This patch adds multicore
support in the driver.

Signed-off-by: Dilip Kota <eswara.kota@linux.intel.com>
---
 drivers/spi/spi-lantiq-ssc.c | 7 +++++++
 1 file changed, 7 insertions(+)
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Patch

diff --git a/drivers/spi/spi-lantiq-ssc.c b/drivers/spi/spi-lantiq-ssc.c
index 44600fb71c484..1073a70a4beba 100644
--- a/drivers/spi/spi-lantiq-ssc.c
+++ b/drivers/spi/spi-lantiq-ssc.c
@@ -623,7 +623,9 @@  static void rx_request(struct lantiq_ssc_spi *spi)
 static irqreturn_t lantiq_ssc_xmit_interrupt(int irq, void *data)
 {
 	struct lantiq_ssc_spi *spi = data;
+	unsigned long flags;
 
+	spin_lock_irqsave(&spi->lock, flags);
 	if (spi->tx) {
 		if (spi->rx && spi->rx_todo)
 			rx_fifo_read_full_duplex(spi);
@@ -645,10 +647,12 @@  static irqreturn_t lantiq_ssc_xmit_interrupt(int irq, void *data)
 		}
 	}
 
+	spin_unlock_irqrestore(&spi->lock, flags);
 	return IRQ_HANDLED;
 
 completed:
 	queue_work(spi->wq, &spi->work);
+	spin_unlock_irqrestore(&spi->lock, flags);
 
 	return IRQ_HANDLED;
 }
@@ -657,10 +661,12 @@  static irqreturn_t lantiq_ssc_err_interrupt(int irq, void *data)
 {
 	struct lantiq_ssc_spi *spi = data;
 	u32 stat = lantiq_ssc_readl(spi, LTQ_SPI_STAT);
+	unsigned long flags;
 
 	if (!(stat & LTQ_SPI_STAT_ERRORS))
 		return IRQ_NONE;
 
+	spin_lock_irqsave(&spi->lock, flags);
 	if (stat & LTQ_SPI_STAT_RUE)
 		dev_err(spi->dev, "receive underflow error\n");
 	if (stat & LTQ_SPI_STAT_TUE)
@@ -681,6 +687,7 @@  static irqreturn_t lantiq_ssc_err_interrupt(int irq, void *data)
 	if (spi->master->cur_msg)
 		spi->master->cur_msg->status = -EIO;
 	queue_work(spi->wq, &spi->work);
+	spin_unlock_irqrestore(&spi->lock, flags);
 
 	return IRQ_HANDLED;
 }