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ALSA: x86: Explicit specify 32bit DMA 

LPE audio is capable only up to 32bit address, as it seems.
Then we should limit the DMA addresses accordingly via dma-mapping
API.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2017-02-02 22:03:22 +01:00
parent c1a7c40cff
commit 412bbe7d5b
1 changed files with 6 additions and 2 deletions
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8
sound/x86/intel_hdmi_audio.c
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@ -28,6 +28,7 @@
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/pm_runtime.h>
#include <linux/dma-mapping.h>
#include <asm/cacheflush.h>
#include <sound/core.h>
#include <sound/asoundef.h>
@ -1825,8 +1826,6 @@ static int hdmi_lpe_audio_probe(struct platform_device *pdev)
struct resource *res_mmio;
int i, ret;
dev_dbg(&pdev->dev, "dma_mask: %p\n", pdev->dev.dma_mask);
pdata = pdev->dev.platform_data;
if (!pdata) {
dev_err(&pdev->dev, "%s: quit: pdata not allocated by i915!!\n", __func__);
@ -1907,6 +1906,11 @@ static int hdmi_lpe_audio_probe(struct platform_device *pdev)
/* setup the ops for playabck */
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
&snd_intelhad_playback_ops);
/* only 32bit addressable */
dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
/* allocate dma pages for ALSA stream operations
* memory allocated is based on size, not max value
* thus using same argument for max & size