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spi: cadence: Correct handling of native chipselect

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[ Upstream commit 61acd19f9c56fa0809285346bd0bd4a926ab0da0 ]

To fix a regression on the Cadence SPI driver, this patch reverts
commit 6046f5407f ("spi: cadence: Fix default polarity of native
chipselect").

This patch was not the correct fix for the issue. The SPI framework
calls the set_cs line with the logic level it desires on the chip select
line, as such the old is_high handling was correct. However, this was
broken by the fact that before commit 3e5ec1db8bfe ("spi: Fix SPI_CS_HIGH
setting when using native and GPIO CS") all controllers that offered
the use of a GPIO chip select had SPI_CS_HIGH applied, even for hardware
chip selects. This caused the value passed into the driver to be inverted.
Which unfortunately makes it look like a logical enable the chip select
value.

Since the core was corrected to not unconditionally apply SPI_CS_HIGH,
the Cadence driver, whilst using the hardware chip select, will deselect
the chip select every time we attempt to communicate with the device,
which results in failed communications.

Fixes: 3e5ec1db8bfe ("spi: Fix SPI_CS_HIGH setting when using native and GPIO CS")
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20191126164140.6240-1-ckeepax@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Charles Keepax 2019-11-26 16:41:40 +00:00 • committed by Greg Kroah-Hartman
commit dba56969cc
1 changed files with 3 additions and 3 deletions
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6
drivers/spi/spi-cadence.c
View file

@ -168,16 +168,16 @@ static void cdns_spi_init_hw(struct cdns_spi *xspi)
/**
* cdns_spi_chipselect - Select or deselect the chip select line
* @spi: Pointer to the spi_device structure
* @enable: Select (1) or deselect (0) the chip select line
* @is_high: Select(0) or deselect (1) the chip select line
*/
static void cdns_spi_chipselect(struct spi_device *spi, bool enable)
static void cdns_spi_chipselect(struct spi_device *spi, bool is_high)
{
struct cdns_spi *xspi = spi_master_get_devdata(spi->master);
u32 ctrl_reg;
ctrl_reg = cdns_spi_read(xspi, CDNS_SPI_CR);
if (!enable) {
if (is_high) {
/* Deselect the slave */
ctrl_reg |= CDNS_SPI_CR_SSCTRL;
} else {