[v2,14/21] spi: dw: Explicitly de-assert CS on SPI transfer completion

Commit Message

Serge Semin Sept. 30, 2020, 6:55 p.m. UTC

By design of the currently available native set_cs callback, the CS
de-assertion will be done only if it's required by the corresponding
controller capability. But in order to pre-fill the Tx FIFO buffer with
data during the SPI memory ops execution the SER register needs to be left
cleared before that. We'll also need a way to explicitly set and clear the
corresponding CS bit at a certain moment of the operation. Let's alter
the set_cs function then to also de-activate the CS, when it's required.

Signed-off-by: Serge Semin <[e-mail]>
---
 drivers/spi/spi-dw-core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Patch

diff --git a/drivers/spi/spi-dw-core.c b/drivers/spi/spi-dw-core.c
index fca929280aab..a6f86314567f 100644
--- a/drivers/spi/spi-dw-core.c
+++ b/drivers/spi/spi-dw-core.c
@@ -100,7 +100,7 @@  void dw_spi_set_cs(struct spi_device *spi, bool enable)
 	 */
 	if (cs_high == enable)
 		dw_writel(dws, DW_SPI_SER, BIT(spi->chip_select));
-	else if (dws->caps & DW_SPI_CAP_CS_OVERRIDE)
+	else
 		dw_writel(dws, DW_SPI_SER, 0);
 }
 EXPORT_SYMBOL_GPL(dw_spi_set_cs);