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Commit 8bc85a87 authored by Oleksij Rempel's avatar Oleksij Rempel Committed by Mark Brown
Browse files

spi: loopback-test: implement testing with no CS 



To run spi-loopback-tests on HW without modifications, we need to
disable Chip Select. This should avoid surprising side effects for
SPI devices by testing patterns.

Signed-off-by: default avatarOleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 59a8831d

drivers/spi/spi-loopback-test.c

+9 −3
Original line number Diff line number Diff line
@@ -57,6 +57,11 @@ MODULE_PARM_DESC(loop_req, 
		 "if set controller will be asked to enable test loop mode. " \

		 "If controller supported it, MISO and MOSI will be connected");



static int no_cs;

module_param(no_cs, int, 0);

MODULE_PARM_DESC(no_cs,

		 "if set Chip Select (CS) will not be used");



/* run only a specific test */

static int run_only_test = -1;

module_param(run_only_test, int, 0);
@@ -319,11 +324,12 @@ static int spi_loopback_test_probe(struct spi_device *spi) 
{

	int ret;



	if (loop_req) {

		spi->mode = SPI_LOOP | spi->mode;

	if (loop_req || no_cs) {

		spi->mode |= loop_req ? SPI_LOOP : 0;

		spi->mode |= no_cs ? SPI_NO_CS : 0;

		ret = spi_setup(spi);

		if (ret) {

			dev_err(&spi->dev, "SPI setup with SPI_LOOP failed (%d)\n",

			dev_err(&spi->dev, "SPI setup with SPI_LOOP or SPI_NO_CS failed (%d)\n",

				ret);

			return ret;

		}