spi: dw: Handle any number of gpiod CS lines

Even when configured to use only gpiod CS lines, the DW SPI controller still expects a bit to be set in the SER register, otherwise transfers stall. For the csgpiod case, nominate bit 0 for the job. See: #6159 Signed-off-by: Phil Elwell <[email protected]>
raspberrypi · May 14, 2024 · f0537b9 · f0537b9
1 parent abc5014
commit f0537b9
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/drivers/spi/spi-dw-core.c b/drivers/spi/spi-dw-core.c
@@ -98,7 +98,8 @@ void dw_spi_set_cs(struct spi_device *spi, bool enable)
 	 * support active-high or active-low CS level.
 	 */
 	if (cs_high == enable)
-		dw_writel(dws, DW_SPI_SER, BIT(spi_get_chipselect(spi, 0)));
+		dw_writel(dws, DW_SPI_SER,
+			BIT(spi_get_csgpiod(spi, 0) ? 0 : spi_get_chipselect(spi, 0)));
 	else
 		dw_writel(dws, DW_SPI_SER, 0);
 }