1 files changed, 24 insertions, 6 deletions

diff --git a/sound/soc/soc-generic-dmaengine-pcm.c b/sound/soc/soc-generic-dmaengine-pcm.c
index c39e19e84c8a..99f9495c1c40 100644
--- a/sound/soc/soc-generic-dmaengine-pcm.c
+++ b/sound/soc/soc-generic-dmaengine-pcm.c
@@ -84,12 +84,19 @@ static int dmaengine_pcm_hw_params(struct snd_pcm_substream *substream,
         struct snd_soc_pcm_runtime *rtd = substream->private_data;
         struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform);
         struct dma_chan *chan = snd_dmaengine_pcm_get_chan(substream);
+        int (*prepare_slave_config)(struct snd_pcm_substream *substream,
+                        struct snd_pcm_hw_params *params,
+                        struct dma_slave_config *slave_config);
         struct dma_slave_config slave_config;
         int ret;
 
-        if (pcm->config->prepare_slave_config) {
-                ret = pcm->config->prepare_slave_config(substream, params,
-                                &slave_config);
+        if (!pcm->config)
+                prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config;
+        else
+                prepare_slave_config = pcm->config->prepare_slave_config;
+
+        if (prepare_slave_config) {
+                ret = prepare_slave_config(substream, params, &slave_config);
                 if (ret)
                         return ret;
 
@@ -112,7 +119,7 @@ static int dmaengine_pcm_set_runtime_hwparams(struct snd_pcm_substream *substrea
         struct snd_pcm_hardware hw;
         int ret;
 
-        if (pcm->config->pcm_hardware)
+        if (pcm->config && pcm->config->pcm_hardware)
                 return snd_soc_set_runtime_hwparams(substream,
                                 pcm->config->pcm_hardware);
 
@@ -177,9 +184,20 @@ static int dmaengine_pcm_new(struct snd_soc_pcm_runtime *rtd)
         struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform);
         const struct snd_dmaengine_pcm_config *config = pcm->config;
         struct snd_pcm_substream *substream;
+        size_t prealloc_buffer_size;
+        size_t max_buffer_size;
         unsigned int i;
         int ret;
 
+        if (config && config->prealloc_buffer_size) {
+                prealloc_buffer_size = config->prealloc_buffer_size;
+                max_buffer_size = config->pcm_hardware->buffer_bytes_max;
+        } else {
+                prealloc_buffer_size = 512 * 1024;
+                max_buffer_size = SIZE_MAX;
+        }
+
+
         for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_CAPTURE; i++) {
                 substream = rtd->pcm->streams[i].substream;
                 if (!substream)
@@ -200,8 +218,8 @@ static int dmaengine_pcm_new(struct snd_soc_pcm_runtime *rtd)
                 ret = snd_pcm_lib_preallocate_pages(substream,
                                 SNDRV_DMA_TYPE_DEV,
                                 dmaengine_dma_dev(pcm, substream),
-                                config->prealloc_buffer_size,
-                                config->pcm_hardware->buffer_bytes_max);
+                                prealloc_buffer_size,
+                                max_buffer_size);
                 if (ret)
                         goto err_free;
         }