[PATCH 17/18] ASoC: bcm2835-i2s: Use phys addresses for DAI DMA

Dave Stevenson
2024-05-24T18:28:05Z

From: Phil Elwell <phil@raspberrypi.com>

Contrary to what struct snd_dmaengine_dai_dma_data suggests, the
configuration of addresses of DMA slave interfaces should be done in
CPU physical addresses.

Signed-off-by: Phil Elwell <phil@raspberrypi.com>
Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
---
sound/soc/bcm/bcm2835-i2s.c | 18 ++++--------------
1 file changed, 4 insertions(+), 14 deletions(-)

diff --git a/sound/soc/bcm/bcm2835-i2s.c b/sound/soc/bcm/bcm2835-i2s.c
index 9bda6499e66e..2d0fe53245f0 100644
--- a/sound/soc/bcm/bcm2835-i2s.c
+++ b/sound/soc/bcm/bcm2835-i2s.c
@@ -30,7 +30,6 @@
#include <linux/init.h>
#include <linux/io.h>
#include <linux/module.h>
-#include <linux/of_address.h>
#include <linux/slab.h>

#include <sound/core.h>
@@ -830,8 +829,7 @@ static int bcm2835_i2s_probe(struct platform_device *pdev)
struct bcm2835_i2s_dev *dev;
int ret;
void __iomem *base;
- const __be32 *addr;
- dma_addr_t dma_base;
+ struct resource *res;

dev = devm_kzalloc(&pdev->dev, sizeof(*dev),
GFP_KERNEL);
@@ -846,7 +844,7 @@ static int bcm2835_i2s_probe(struct platform_device *pdev)
"could not get clk\n");

/* Request ioarea */
- base = devm_platform_ioremap_resource(pdev, 0);
+ base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
if (IS_ERR(base))
return PTR_ERR(base);

@@ -855,19 +853,11 @@ static int bcm2835_i2s_probe(struct platform_device *pdev)
if (IS_ERR(dev->i2s_regmap))
return PTR_ERR(dev->i2s_regmap);

- /* Set the DMA address - we have to parse DT ourselves */
- addr = of_get_address(pdev->dev.of_node, 0, NULL, NULL);
- if (!addr) {
- dev_err(&pdev->dev, "could not get DMA-register address\n");
- return -EINVAL;
- }
- dma_base = be32_to_cpup(addr);
-
dev->dma_data[SNDRV_PCM_STREAM_PLAYBACK].addr =
- dma_base + BCM2835_I2S_FIFO_A_REG;
+ res->start + BCM2835_I2S_FIFO_A_REG;

dev->dma_data[SNDRV_PCM_STREAM_CAPTURE].addr =
- dma_base + BCM2835_I2S_FIFO_A_REG;
+ res->start + BCM2835_I2S_FIFO_A_REG;

/* Set the bus width */
dev->dma_data[SNDRV_PCM_STREAM_PLAYBACK].addr_width =
--
2.34.1