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spi: stm32-qspi: 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-v2-5-62526c9467dc@foss.st.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Patrice Chotard 2025-12-08 08:29:12 +01:00 committed by Mark Brown
parent e2f0ea18e5
commit 4ef80c71c6
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 11 additions and 2 deletions
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13
drivers/spi/spi-stm32-qspi.c
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@ -689,6 +689,7 @@ static int stm32_qspi_dma_setup(struct stm32_qspi *qspi)
{
struct dma_slave_config dma_cfg;
struct device *dev = qspi->dev;
struct dma_slave_caps caps;
int ret = 0;
memset(&dma_cfg, 0, sizeof(dma_cfg));
@ -697,8 +698,6 @@ static int stm32_qspi_dma_setup(struct stm32_qspi *qspi)
dma_cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
dma_cfg.src_addr = qspi->phys_base + QSPI_DR;
dma_cfg.dst_addr = qspi->phys_base + QSPI_DR;
dma_cfg.src_maxburst = 4;
dma_cfg.dst_maxburst = 4;
qspi->dma_chrx = dma_request_chan(dev, "rx");
if (IS_ERR(qspi->dma_chrx)) {
@ -707,6 +706,11 @@ static int stm32_qspi_dma_setup(struct stm32_qspi *qspi)
if (ret == -EPROBE_DEFER)
goto out;
} else {
ret = dma_get_slave_caps(qspi->dma_chrx, &caps);
if (ret)
return ret;
dma_cfg.src_maxburst = caps.max_burst / dma_cfg.src_addr_width;
if (dmaengine_slave_config(qspi->dma_chrx, &dma_cfg)) {
dev_err(dev, "dma rx config failed\n");
dma_release_channel(qspi->dma_chrx);
@ -719,6 +723,11 @@ static int stm32_qspi_dma_setup(struct stm32_qspi *qspi)
ret = PTR_ERR(qspi->dma_chtx);
qspi->dma_chtx = NULL;
} else {
ret = dma_get_slave_caps(qspi->dma_chtx, &caps);
if (ret)
return ret;
dma_cfg.dst_maxburst = caps.max_burst / dma_cfg.dst_addr_width;
if (dmaengine_slave_config(qspi->dma_chtx, &dma_cfg)) {
dev_err(dev, "dma tx config failed\n");
dma_release_channel(qspi->dma_chtx);