Commit 899929ba authored by Ricardo Ribalda Delgado's avatar Ricardo Ribalda Delgado Committed by Mark Brown
Browse files

spi/xilinx: Leave the IRQ always enabled. 



Instead of enabling the IRQ and disabling it for every transaction.

Specially the small transactions (1,2 words) benefit from removing 3 bus
accesses.

Signed-off-by: default avatarRicardo Ribalda Delgado <ricardo.ribalda@gmail.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 4c9a7614

drivers/spi/spi-xilinx.c

+5 −14
Original line number Diff line number Diff line
@@ -167,8 +167,11 @@ static void xspi_init_hw(struct xilinx_spi *xspi) 
	/* Reset the SPI device */

	xspi->write_fn(XIPIF_V123B_RESET_MASK,

		regs_base + XIPIF_V123B_RESETR_OFFSET);

	/* Disable all the interrupts just in case */

	xspi->write_fn(0, regs_base + XIPIF_V123B_IIER_OFFSET);

	/* Enable the transmit empty interrupt, which we use to determine

	 * progress on the transmission.

	 */

	xspi->write_fn(XSPI_INTR_TX_EMPTY,

			regs_base + XIPIF_V123B_IIER_OFFSET);

	/* Enable the global IPIF interrupt */

	xspi->write_fn(XIPIF_V123B_GINTR_ENABLE,

		regs_base + XIPIF_V123B_DGIER_OFFSET);
@@ -237,7 +240,6 @@ static void xilinx_spi_fill_tx_fifo(struct xilinx_spi *xspi, int n_words) 
static int xilinx_spi_txrx_bufs(struct spi_device *spi, struct spi_transfer *t)

{

	struct xilinx_spi *xspi = spi_master_get_devdata(spi->master);

	u32 ipif_ier;



	/* We get here with transmitter inhibited */
@@ -246,14 +248,6 @@ static int xilinx_spi_txrx_bufs(struct spi_device *spi, struct spi_transfer *t) 
	xspi->remaining_bytes = t->len;

	reinit_completion(&xspi->done);





	/* Enable the transmit empty interrupt, which we use to determine

	 * progress on the transmission.

	 */

	ipif_ier = xspi->read_fn(xspi->regs + XIPIF_V123B_IIER_OFFSET);

	xspi->write_fn(ipif_ier | XSPI_INTR_TX_EMPTY,

		xspi->regs + XIPIF_V123B_IIER_OFFSET);



	for (;;) {

		u16 cr;

		int n_words;
@@ -290,9 +284,6 @@ static int xilinx_spi_txrx_bufs(struct spi_device *spi, struct spi_transfer *t) 
			break;

	}



	/* Disable the transmit empty interrupt */

	xspi->write_fn(ipif_ier, xspi->regs + XIPIF_V123B_IIER_OFFSET);



	return t->len - xspi->remaining_bytes;

}