Hi Kuninori,
On 8/18/2020 8:11 AM, Kuninori Morimoto wrote:
External email: Use caution opening links or attachments
Hi Sameer
PCM devices are created for FE dai links with 'no-pcm' flag as '0'.
Such DAI links have CPU component which implement either pcm_construct()
or pcm_new() at component or dai level respectively. Based on this,
current patch exposes a helper function to identify such components
and populate 'no_pcm' flag for DPCM DAI link.
This helps to have BE<->BE component links where PCM devices need
not be created for CPU component involved in such links.
Signed-off-by: Sameer Pujar <spujar@xxxxxxxxxx>
---
(snip)
@@ -259,6 +270,16 @@ static int graph_dai_link_of_dpcm(struct asoc_simple_priv *priv,
if (ret < 0)
goto out_put_node;
+ /*
+ * In BE<->BE connections it is not required to create
+ * PCM devices at CPU end of the dai link and thus 'no_pcm'
+ * flag needs to be set. It is useful when there are many
+ * BE components and some of these have to be connected to
+ * form a valid audio path.
+ */
+ if (!soc_component_is_pcm(cpus))
+ dai_link->no_pcm = 1;
+
For safety, I want to judge with data->component_chaining.
if (data->component_chaining &&
!soc_component_is_pcm(cpus))
dai_link->no_pcm = 1;
OK. I will keep the additional check. Thanks.
Thank you for your help !!
Best regards
---
Kuninori Morimoto
