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| author | Janne Grunau <j@jannau.net> | 2024-03-12 01:53:17 +0300 |
|---|---|---|
| committer | Sasha Levin <sashal@kernel.org> | 2024-03-27 01:17:31 +0300 |
| commit | 55ed48c68ea209a5033bd6c25574e3a96066b20b (patch) | |
| tree | ed9945dccbf1a236548a9c394fc3c047fefa8dac /drivers/spi | |
| parent | 996ce839606afd0fef91355627868022aa73eb68 (diff) | |
| download | linux-55ed48c68ea209a5033bd6c25574e3a96066b20b.tar.xz | |
spi: Restore delays for non-GPIO chip select
[ Upstream commit aa0162dc0dd95c3bf248e3c78068760094e8f64b ]
SPI controller with integrated chip select handling still need to adhere
to SPI device's CS setup, hold and inactive delays. For controller
without set_cs_timing spi core shall handle the delays to avoid
duplicated delay handling in each controller driver.
Fixes a regression for the out of tree SPI controller and SPI HID
transport on Apple M1/M1 Pro/Max notebooks.
Fixes: 4d8ff6b0991d ("spi: Add multi-cs memories support in SPI core")
Signed-off-by: Janne Grunau <j@jannau.net>
Link: https://msgid.link/r/20240311-spi-cs-delays-regression-v1-1-0075020a90b2@jannau.net
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/spi')
| -rw-r--r-- | drivers/spi/spi.c | 24 |
1 files changed, 14 insertions, 10 deletions
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index d1b297f438f1..46f153548760 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -1042,10 +1042,14 @@ static void spi_set_cs(struct spi_device *spi, bool enable, bool force) if (spi->mode & SPI_CS_HIGH) enable = !enable; - if (spi_is_csgpiod(spi)) { - if (!spi->controller->set_cs_timing && !activate) - spi_delay_exec(&spi->cs_hold, NULL); + /* + * Handle chip select delays for GPIO based CS or controllers without + * programmable chip select timing. + */ + if ((spi_is_csgpiod(spi) || !spi->controller->set_cs_timing) && !activate) + spi_delay_exec(&spi->cs_hold, NULL); + if (spi_is_csgpiod(spi)) { if (!(spi->mode & SPI_NO_CS)) { /* * Historically ACPI has no means of the GPIO polarity and @@ -1079,16 +1083,16 @@ static void spi_set_cs(struct spi_device *spi, bool enable, bool force) if ((spi->controller->flags & SPI_CONTROLLER_GPIO_SS) && spi->controller->set_cs) spi->controller->set_cs(spi, !enable); - - if (!spi->controller->set_cs_timing) { - if (activate) - spi_delay_exec(&spi->cs_setup, NULL); - else - spi_delay_exec(&spi->cs_inactive, NULL); - } } else if (spi->controller->set_cs) { spi->controller->set_cs(spi, !enable); } + + if (spi_is_csgpiod(spi) || !spi->controller->set_cs_timing) { + if (activate) + spi_delay_exec(&spi->cs_setup, NULL); + else + spi_delay_exec(&spi->cs_inactive, NULL); + } } #ifdef CONFIG_HAS_DMA |