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| author | Serge Semin <Sergey.Semin@baikalelectronics.ru> | 2020-10-08 02:55:03 +0300 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2020-10-09 01:00:17 +0300 |
| commit | 49d7d695ca4bb2f62290c7039c4165556f0ca1e4 (patch) | |
| tree | 391fc0c22999f8a1fe2a8db565f48afb7767a7bb /drivers/spi/spi-dw-core.c | |
| parent | fbddc989a5c441099978aad320ada0d5327309f4 (diff) | |
| download | linux-49d7d695ca4bb2f62290c7039c4165556f0ca1e4.tar.xz | |
spi: dw: Explicitly de-assert CS on SPI transfer completion
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 <Sergey.Semin@baikalelectronics.ru>
Link: https://lore.kernel.org/r/20201007235511.4935-15-Sergey.Semin@baikalelectronics.ru
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi/spi-dw-core.c')
| -rw-r--r-- | drivers/spi/spi-dw-core.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/spi/spi-dw-core.c b/drivers/spi/spi-dw-core.c index ac87ff6d8be4..76e323db170f 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); |