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authorDilip Kota <eswara.kota@linux.intel.com>2020-07-17 14:27:51 +0800
committerMark Brown <broonie@kernel.org>2020-07-22 01:55:54 +0100
commitddf41bf782d2fb1df605407c7fff1160f488c949 (patch)
treeaab488339ad14549ba52a90ef59563e6a077cd6a /drivers/spi
parent661ccf2b3f1360be50242726f7c26ced6a9e7d52 (diff)
spi: lantiq: Add SMP support
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> Link: https://lore.kernel.org/r/d6663296b41f102c582fda08e71f62b72ca05d5d.1594957019.git.eswara.kota@linux.intel.com Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi')
-rw-r--r--drivers/spi/spi-lantiq-ssc.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/spi/spi-lantiq-ssc.c b/drivers/spi/spi-lantiq-ssc.c
index 24585890996b..2ffe30354c13 100644
--- a/drivers/spi/spi-lantiq-ssc.c
+++ b/drivers/spi/spi-lantiq-ssc.c
@@ -622,7 +622,9 @@ 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);
@@ -644,10 +646,12 @@ 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;
}
@@ -656,10 +660,12 @@ 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)
@@ -680,6 +686,7 @@ 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;
}