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drivers: dma: fix the WCH DMA transfer width

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The driver treats the `source_data_size` and `dest_data_size` as a
width in bits and converts 8 bits to 1, 16 bits to 2, and 32 bits to 3.

This should be a width in bytes with 1 byte mapping to 0, 2 bytes to
1, and 4 bytes to 3.

Note that this preserves the current behaviour of silently accepting
invalid transfer bit widths.

Signed-off-by: Michael Hope <michaelh@juju.nz>
This commit is contained in:
Michael Hope 2025-06-01 11:44:09 +00:00 • committed by Daniel DeGrasse
commit c37abf115d
1 changed files with 20 additions and 8 deletions
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28
drivers/dma/dma_wch.c
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@ -89,6 +89,22 @@ static int dma_wch_init(const struct device *dev)
return 0;
}
/* Coverts a transfer width in bytes to the corresponding bitfield */
static uint16_t dma_wch_width_index(uint32_t bytes)
{
switch (bytes) {
case 1:
return 0;
case 2:
return 1;
case 4:
return 2;
default:
/* Return a bad but safe value rather than validate */
return 0;
}
}
static int dma_wch_config(const struct device *dev, uint32_t ch, struct dma_config *dma_cfg)
{
const struct dma_wch_config *config = dev->config;
@ -146,10 +162,8 @@ static int dma_wch_config(const struct device *dev, uint32_t ch, struct dma_conf
cfgr |= dma_cfg->channel_priority * DMA_CFGR1_PL_0;
if (dma_cfg->channel_direction == MEMORY_TO_PERIPHERAL) {
cfgr |= dma_width_index(dma_cfg->source_data_size / BITS_PER_BYTE) *
DMA_CFGR1_MSIZE_0;
cfgr |= dma_width_index(dma_cfg->dest_data_size / BITS_PER_BYTE) *
DMA_CFGR1_PSIZE_0;
cfgr |= dma_wch_width_index(dma_cfg->source_data_size) * DMA_CFGR1_MSIZE_0;
cfgr |= dma_wch_width_index(dma_cfg->dest_data_size) * DMA_CFGR1_PSIZE_0;
cfgr |= (dma_cfg->head_block->dest_addr_adj == DMA_ADDR_ADJ_INCREMENT)
? DMA_CFGR1_PINC
@ -158,10 +172,8 @@ static int dma_wch_config(const struct device *dev, uint32_t ch, struct dma_conf
? DMA_CFGR1_MINC
: 0;
} else {
cfgr |= dma_width_index(dma_cfg->source_data_size / BITS_PER_BYTE) *
DMA_CFGR1_PSIZE_0;
cfgr |= dma_width_index(dma_cfg->dest_data_size / BITS_PER_BYTE) *
DMA_CFGR1_MSIZE_0;
cfgr |= dma_wch_width_index(dma_cfg->source_data_size) * DMA_CFGR1_PSIZE_0;
cfgr |= dma_wch_width_index(dma_cfg->dest_data_size) * DMA_CFGR1_MSIZE_0;
cfgr |= (dma_cfg->head_block->dest_addr_adj == DMA_ADDR_ADJ_INCREMENT)
? DMA_CFGR1_MINC