Unverified Commit ddf41bf7 authored by Dilip Kota's avatar Dilip Kota Committed by Mark Brown
Browse files

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: default avatarDilip Kota <eswara.kota@linux.intel.com>
Link: https://lore.kernel.org/r/d6663296b41f102c582fda08e71f62b72ca05d5d.1594957019.git.eswara.kota@linux.intel.com


Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 661ccf2b

drivers/spi/spi-lantiq-ssc.c

+7 −0
Original line number Diff line number Diff line
@@ -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;

}

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