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| author | Joy Chakraborty <joychakr@google.com> | 2023-04-27 14:33:10 +0200 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2023-05-08 02:11:27 +0200 |
| commit | 5147d5bfddc807e990a762aed0e56724afeda663 (patch) | |
| tree | eb10fc4a4faf82e62cddc8fbbaae62576516a8ea /drivers/spi/spi-dw-dma.c | |
| parent | Linux 6.4-rc1 (diff) | |
| download | linux-5147d5bfddc807e990a762aed0e56724afeda663.tar.xz linux-5147d5bfddc807e990a762aed0e56724afeda663.zip | |
spi: dw: Add 32 bpw support to SPI DW DMA driver
Add Support for AxSize = 4 bytes configuration from dw dma driver if
n_bytes i.e. number of bytes per write to fifo is 4.
Number of bytes written to fifo per write is depended on the bits/word
configuration being used which the DW core driver translates to n_bytes.
Hence, for bits per word values between 17 and 32 n_bytes should be
equal to 4.
* tested on Baikal-T1 based system with DW SPI-looped back interface
transferring a chunk of data with DFS:8,12,16.
Signed-off-by: Joy Chakraborty <joychakr@google.com
Reviewed-by: Serge Semin <fancer.lancer@gmail.com
Tested-by: Serge Semin <fancer.lancer@gmail.com
Link: https://lore.kernel.org/r/20230427123314.1997152-2-joychakr@google.com
Signed-off-by: Mark Brown <broonie@kernel.org
Diffstat (limited to 'drivers/spi/spi-dw-dma.c')
| -rw-r--r-- | drivers/spi/spi-dw-dma.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/drivers/spi/spi-dw-dma.c b/drivers/spi/spi-dw-dma.c index ababb910b391..c1b42cb59965 100644 --- a/drivers/spi/spi-dw-dma.c +++ b/drivers/spi/spi-dw-dma.c @@ -208,12 +208,16 @@ static bool dw_spi_can_dma(struct spi_controller *master, static enum dma_slave_buswidth dw_spi_dma_convert_width(u8 n_bytes) { - if (n_bytes == 1) + switch (n_bytes) { + case 1: return DMA_SLAVE_BUSWIDTH_1_BYTE; - else if (n_bytes == 2) + case 2: return DMA_SLAVE_BUSWIDTH_2_BYTES; - - return DMA_SLAVE_BUSWIDTH_UNDEFINED; + case 4: + return DMA_SLAVE_BUSWIDTH_4_BYTES; + default: + return DMA_SLAVE_BUSWIDTH_UNDEFINED; + } } static int dw_spi_dma_wait(struct dw_spi *dws, unsigned int len, u32 speed) |