Unverified Commit 4ef80c71 authored by Patrice Chotard's avatar Patrice Chotard Committed by Mark Brown
Browse files

spi: stm32-qspi: Set DMA maxburst dynamically 



Set src_maxburst and dst_maxburst dynamically from DMA
capabilities.

Signed-off-by: default avatarPatrice 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: default avatarMark Brown <broonie@kernel.org>
parent e2f0ea18

drivers/spi/spi-stm32-qspi.c

+11 −2
Original line number Diff line number Diff line
@@ -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);