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spi: dw: DW SPI DMA Driver updates 

Merge series from Joy Chakraborty <joychakr@google.com>:

This Patch series adds support for 32 bits per word trasfers using DMA
and some defensive checks around dma controller capabilities.
This commit is contained in:
Mark Brown 2023-05-08 22:34:26 +09:00
parent dd69654cd3 d2ae5d4246
commit 057e1ae744
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GPG Key ID: 24D68B725D5487D0
1 changed files with 14 additions and 10 deletions
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24
drivers/spi/spi-dw-dma.c
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@ -198,6 +198,20 @@ static irqreturn_t dw_spi_dma_transfer_handler(struct dw_spi *dws)
return IRQ_HANDLED;
}
static enum dma_slave_buswidth dw_spi_dma_convert_width(u8 n_bytes)
{
switch (n_bytes) {
case 1:
return DMA_SLAVE_BUSWIDTH_1_BYTE;
case 2:
return DMA_SLAVE_BUSWIDTH_2_BYTES;
case 4:
return DMA_SLAVE_BUSWIDTH_4_BYTES;
default:
return DMA_SLAVE_BUSWIDTH_UNDEFINED;
}
}
static bool dw_spi_can_dma(struct spi_controller *master,
struct spi_device *spi, struct spi_transfer *xfer)
{
@ -206,16 +220,6 @@ static bool dw_spi_can_dma(struct spi_controller *master,
return xfer->len > dws->fifo_len;
}
static enum dma_slave_buswidth dw_spi_dma_convert_width(u8 n_bytes)
{
if (n_bytes == 1)
return DMA_SLAVE_BUSWIDTH_1_BYTE;
else if (n_bytes == 2)
return DMA_SLAVE_BUSWIDTH_2_BYTES;
return DMA_SLAVE_BUSWIDTH_UNDEFINED;
}
static int dw_spi_dma_wait(struct dw_spi *dws, unsigned int len, u32 speed)
{
unsigned long long ms;