ASoC: meson: aiu: fifo: Add missing dma_coerce_mask_and_coherent()

[ Upstream commit 1bcd326631dc4faa3322d60b4fc45e8b3747993e ]

The FIFO registers which take an DMA-able address are only 32-bit wide
on AIU. Add dma_coerce_mask_and_coherent() to make the DMA core aware of
this limitation.

Fixes: 6ae9ca9ce986bf ("ASoC: meson: aiu: add i2s and spdif support")
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Link: https://lore.kernel.org/r/20211206210804.2512999-2-martin.blumenstingl@googlemail.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/sound/soc/meson/aiu-fifo.c b/sound/soc/meson/aiu-fifo.c
index 4ad2326..d67ff4c 100644 (file)
--- a/sound/soc/meson/aiu-fifo.c
+++ b/sound/soc/meson/aiu-fifo.c
@@ -5,6 +5,7 @@
 
 #include <linux/bitfield.h>
 #include <linux/clk.h>
+#include <linux/dma-mapping.h>
 #include <sound/pcm_params.h>
 #include <sound/soc.h>
 #include <sound/soc-dai.h>
@@ -179,6 +180,11 @@ int aiu_fifo_pcm_new(struct snd_soc_pcm_runtime *rtd,
        struct snd_card *card = rtd->card->snd_card;
        struct aiu_fifo *fifo = dai->playback_dma_data;
        size_t size = fifo->pcm->buffer_bytes_max;
+       int ret;
+
+       ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
+       if (ret)
+               return ret;
 
        snd_pcm_set_managed_buffer_all(rtd->pcm, SNDRV_DMA_TYPE_DEV,
                                       card->dev, size, size);