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>

1 files changed, 6 insertions, 2 deletions

diff --git a/sound/x86/intel_hdmi_audio.c b/sound/x86/intel_hdmi_audio.c
index c83f02c2593e..fac30cf2794f 100644
--- a/sound/x86/intel_hdmi_audio.c
+++ b/sound/x86/intel_hdmi_audio.c
@@ -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