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

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
...@@ -57,6 +57,11 @@ MODULE_PARM_DESC(loop_req, ...@@ -57,6 +57,11 @@ MODULE_PARM_DESC(loop_req,
"if set controller will be asked to enable test loop mode. " \ "if set controller will be asked to enable test loop mode. " \
"If controller supported it, MISO and MOSI will be connected"); "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 */ /* run only a specific test */
static int run_only_test = -1; static int run_only_test = -1;
module_param(run_only_test, int, 0); module_param(run_only_test, int, 0);
...@@ -319,11 +324,12 @@ static int spi_loopback_test_probe(struct spi_device *spi) ...@@ -319,11 +324,12 @@ static int spi_loopback_test_probe(struct spi_device *spi)
{ {
int ret; int ret;
if (loop_req) { if (loop_req || no_cs) {
spi->mode = SPI_LOOP | spi->mode; spi->mode |= loop_req ? SPI_LOOP : 0;
spi->mode |= no_cs ? SPI_NO_CS : 0;
ret = spi_setup(spi); ret = spi_setup(spi);
if (ret) { 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); ret);
return ret; return ret;
} }
......
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