[alsa-devel] [PATCH v2] ASoC: Intel: hdac_hdmi: Limit sampling rates at dai creation

[Yong Zhi]

Playback of 44.1Khz contents with HDMI plugged returns
"Invalid pipe config" because HDMI paths in the FW
topology are configured to operate at 48Khz.

This patch filters out sampling rates not supported
at hdac_hdmi_create_dais() to let user space SRC
to do the converting.

Signed-off-by: Yong Zhi <yong.zhi at intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>
Reviewed-by: Takashi Iwai <tiwai at suse.de>
---
v2:

- Add Reviewed-by tag.
- Use (and tested) Takashi's sample code in his v1 review.

 sound/soc/codecs/hdac_hdmi.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/sound/soc/codecs/hdac_hdmi.c b/sound/soc/codecs/hdac_hdmi.c
index 7b8533abf637..590dc1e33a60 100644
--- a/sound/soc/codecs/hdac_hdmi.c
+++ b/sound/soc/codecs/hdac_hdmi.c
@@ -1410,6 +1410,12 @@ static int hdac_hdmi_create_dais(struct hdac_device *hdev,
 		if (ret)
 			return ret;
 
+		/* Filter out 44.1, 88.2 and 176.4Khz */
+		rates &= ~(SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_88200 |
+			   SNDRV_PCM_RATE_176400);
+		if (!rates)
+			return -EINVAL;
+
 		sprintf(dai_name, "intel-hdmi-hifi%d", i+1);
 		hdmi_dais[i].name = devm_kstrdup(&hdev->dev,
 					dai_name, GFP_KERNEL);
-- 
2.7.4