Unverified Commit 94eca904 authored by Dilip Kota's avatar Dilip Kota Committed by Mark Brown
Browse files

spi: lantiq: Add support to acknowledge interrupt 



On newer chipsets interrupt need to be acknowledged as they use
different interrupt controller which does not acknowledge the
interrupts automatically.

Signed-off-by: default avatarDilip Kota <eswara.kota@linux.intel.com>
Link: https://lore.kernel.org/r/608923b484d9ef239b44bb545c0b79b27030a6ae.1594957019.git.eswara.kota@linux.intel.com


Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 8d19d665

drivers/spi/spi-lantiq-ssc.c

+13 −0
Original line number Diff line number Diff line
@@ -160,6 +160,7 @@ struct lantiq_ssc_hwcfg { 
	unsigned int	irnen_t;

	unsigned int	irncr;

	unsigned int	irnicr;

	bool		irq_ack;

};



struct lantiq_ssc_spi {
@@ -622,9 +623,14 @@ 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;

	const struct lantiq_ssc_hwcfg *hwcfg = spi->hwcfg;

	u32 val = lantiq_ssc_readl(spi, hwcfg->irncr);

	unsigned long flags;



	spin_lock_irqsave(&spi->lock, flags);

	if (hwcfg->irq_ack)

		lantiq_ssc_writel(spi, val, hwcfg->irncr);



	if (spi->tx) {

		if (spi->rx && spi->rx_todo)

			rx_fifo_read_full_duplex(spi);
@@ -659,13 +665,18 @@ completed: 
static irqreturn_t lantiq_ssc_err_interrupt(int irq, void *data)

{

	struct lantiq_ssc_spi *spi = data;

	const struct lantiq_ssc_hwcfg *hwcfg = spi->hwcfg;

	u32 stat = lantiq_ssc_readl(spi, LTQ_SPI_STAT);

	u32 val = lantiq_ssc_readl(spi, hwcfg->irncr);

	unsigned long flags;



	if (!(stat & LTQ_SPI_STAT_ERRORS))

		return IRQ_NONE;



	spin_lock_irqsave(&spi->lock, flags);

	if (hwcfg->irq_ack)

		lantiq_ssc_writel(spi, val, hwcfg->irncr);



	if (stat & LTQ_SPI_STAT_RUE)

		dev_err(spi->dev, "receive underflow error\n");

	if (stat & LTQ_SPI_STAT_TUE)
@@ -796,6 +807,7 @@ static const struct lantiq_ssc_hwcfg lantiq_ssc_xway = { 
	.irnen_t	= LTQ_SPI_IRNEN_T_XWAY,

	.irnicr		= 0xF8,

	.irncr		= 0xFC,

	.irq_ack	= false,

};



static const struct lantiq_ssc_hwcfg lantiq_ssc_xrx = {
@@ -803,6 +815,7 @@ static const struct lantiq_ssc_hwcfg lantiq_ssc_xrx = { 
	.irnen_t	= LTQ_SPI_IRNEN_T_XRX,

	.irnicr		= 0xF8,

	.irncr		= 0xFC,

	.irq_ack	= false,

};



static const struct of_device_id lantiq_ssc_match[] = {

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