diff options
Diffstat (limited to 'drivers/spi/spi-dw.c')
| -rw-r--r-- | drivers/spi/spi-dw.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/spi/spi-dw.c b/drivers/spi/spi-dw.c index 6de196df9c96..450c8218caeb 100644 --- a/drivers/spi/spi-dw.c +++ b/drivers/spi/spi-dw.c @@ -124,8 +124,16 @@ static inline void dw_spi_debugfs_remove(struct dw_spi *dws) void dw_spi_set_cs(struct spi_device *spi, bool enable) { struct dw_spi *dws = spi_controller_get_devdata(spi->controller); + bool cs_high = !!(spi->mode & SPI_CS_HIGH); - if (!enable) + /* + * DW SPI controller demands any native CS being set in order to + * proceed with data transfer. So in order to activate the SPI + * communications we must set a corresponding bit in the Slave + * Enable register no matter whether the SPI core is configured to + * support active-high or active-low CS level. + */ + if (cs_high == enable) dw_writel(dws, DW_SPI_SER, BIT(spi->chip_select)); else if (dws->cs_override) dw_writel(dws, DW_SPI_SER, 0); |