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spi: stm32-ospi: Set DMA maxburst dynamically

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Set src_maxburst and dst_maxburst dynamically from DMA
capabilities.

Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
Link: https://patch.msgid.link/20251208-upstream_qspi_ospi_updates-v2-1-62526c9467dc@foss.st.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Patrice Chotard 2025-12-08 08:29:08 +01:00 committed by Mark Brown
parent 7d0a66e4bb
commit e35a7607e0
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 22 additions and 5 deletions
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27
drivers/spi/spi-stm32-ospi.c
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@ -278,10 +278,19 @@ static irqreturn_t stm32_ospi_irq(int irq, void *dev_id)
return IRQ_HANDLED;
}
static void stm32_ospi_dma_setup(struct stm32_ospi *ospi,
struct dma_slave_config *dma_cfg)
static int stm32_ospi_dma_setup(struct stm32_ospi *ospi,
struct dma_slave_config *dma_cfg)
{
struct dma_slave_caps caps;
int ret = 0;
if (dma_cfg && ospi->dma_chrx) {
ret = dma_get_slave_caps(ospi->dma_chrx, &caps);
if (ret)
return ret;
dma_cfg->src_maxburst = caps.max_burst / dma_cfg->src_addr_width;
if (dmaengine_slave_config(ospi->dma_chrx, dma_cfg)) {
dev_err(ospi->dev, "dma rx config failed\n");
dma_release_channel(ospi->dma_chrx);
@ -290,6 +299,12 @@ static void stm32_ospi_dma_setup(struct stm32_ospi *ospi,
}
if (dma_cfg && ospi->dma_chtx) {
ret = dma_get_slave_caps(ospi->dma_chtx, &caps);
if (ret)
return ret;
dma_cfg->dst_maxburst = caps.max_burst / dma_cfg->dst_addr_width;
if (dmaengine_slave_config(ospi->dma_chtx, dma_cfg)) {
dev_err(ospi->dev, "dma tx config failed\n");
dma_release_channel(ospi->dma_chtx);
@ -298,6 +313,8 @@ static void stm32_ospi_dma_setup(struct stm32_ospi *ospi,
}
init_completion(&ospi->dma_completion);
return ret;
}
static int stm32_ospi_tx_mm(struct stm32_ospi *ospi,
@ -899,9 +916,9 @@ static int stm32_ospi_probe(struct platform_device *pdev)
dma_cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
dma_cfg.src_addr = ospi->regs_phys_base + OSPI_DR;
dma_cfg.dst_addr = ospi->regs_phys_base + OSPI_DR;
dma_cfg.src_maxburst = 4;
dma_cfg.dst_maxburst = 4;
stm32_ospi_dma_setup(ospi, &dma_cfg);
ret = stm32_ospi_dma_setup(ospi, &dma_cfg);
if (ret)
return ret;
mutex_init(&ospi->lock);