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spi: dw: Add 32 bpw support to SPI DW DMA driver

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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
This commit is contained in:
Joy Chakraborty 2023-04-27 12:33:10 +00:00 committed by Mark Brown
parent ac9a78681b
commit 5147d5bfdd
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GPG Key ID: 24D68B725D5487D0
1 changed files with 8 additions and 4 deletions
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12
drivers/spi/spi-dw-dma.c
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@ -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)