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spi: dw: Handle any number of gpiod CS lines

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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: https://github.com/raspberrypi/linux/issues/6159

Signed-off-by: Phil Elwell <phil@raspberrypi.com>
This commit is contained in:
Phil Elwell
2024-05-13 15:40:02 +01:00
committed by Dom Cobley
parent e1f9cf1178
commit 122a1ec435
1 changed files with 2 additions and 1 deletions
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3
drivers/spi/spi-dw-core.c
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@@ -100,7 +100,8 @@ 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);
}