From: Gregory CLEMENT gregory.clement@bootlin.com
commit 7cbb16b2122c09f2ae393a1542fed628505b9da6 upstream.
Until a few years ago, this driver was only used with CS GPIO. The only exception is CS0 on AT91RM9200 which has to use internal CS. A limitation of the internal CS is that they don't support CS High.
So by using the CS GPIO the CS high configuration was available except for the particular case CS0 on RM9200.
When the support for the internal chip-select was added, the check of the CS high support was not updated. Due to this the driver accepts this configuration for all the SPI controller v2 (used by all SoCs excepting the AT91RM9200) whereas the hardware doesn't support it for infernal CS.
This patch fixes the test to match the hardware capabilities.
Fixes: 4820303480a1 ("spi: atmel: add support for the internal chip-select of the spi controller") Cc: stable@vger.kernel.org Signed-off-by: Gregory CLEMENT gregory.clement@bootlin.com Link: https://lore.kernel.org/r/20191017141846.7523-3-gregory.clement@bootlin.com Signed-off-by: Mark Brown broonie@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/spi/spi-atmel.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-)
--- a/drivers/spi/spi-atmel.c +++ b/drivers/spi/spi-atmel.c @@ -1209,10 +1209,8 @@ static int atmel_spi_setup(struct spi_de as = spi_master_get_devdata(spi->master);
/* see notes above re chipselect */ - if (!atmel_spi_is_v2(as) - && spi->chip_select == 0 - && (spi->mode & SPI_CS_HIGH)) { - dev_dbg(&spi->dev, "setup: can't be active-high\n"); + if (!as->use_cs_gpios && (spi->mode & SPI_CS_HIGH)) { + dev_warn(&spi->dev, "setup: non GPIO CS can't be active-high\n"); return -EINVAL; }