Unverified Commit e35a7607 authored by Patrice Chotard's avatar Patrice Chotard Committed by Mark Brown
Browse files

spi: stm32-ospi: 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-v2-1-62526c9467dc@foss.st.com


Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 7d0a66e4

drivers/spi/spi-stm32-ospi.c

+22 −5
Original line number Diff line number Diff line
@@ -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,

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);