From: Libin Yang <libin.yang@xxxxxxxxx> In resume from S3, HDAC HDMI codec driver dapm event callback may be operated before HDMI codec driver turns on the display audio power domain because of the contest between display driver and hdmi codec driver. This patch adds the device_link between soc card device (consumer) and hdmi codec device (supplier) to make sure the sequence is always correct. Signed-off-by: Libin Yang <libin.yang@xxxxxxxxx> --- sound/soc/codecs/hdac_hdmi.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/sound/soc/codecs/hdac_hdmi.c b/sound/soc/codecs/hdac_hdmi.c index 5eeb0fe..8bb883e 100644 --- a/sound/soc/codecs/hdac_hdmi.c +++ b/sound/soc/codecs/hdac_hdmi.c @@ -1855,6 +1855,15 @@ static int hdmi_codec_probe(struct snd_soc_component *component) hdmi->card = dapm->card->snd_card; /* + * Setup a device_link between card device and HDMI codec device. + * The card device is the consumer and the HDMI codec device is + * the supplier. With this setting, we can make sure that the audio + * domain in display power will be always turned on before operating + * on the HDMI audio codec registers. + */ + device_link_add(component->card->dev, &hdev->dev, DL_FLAG_RPM_ACTIVE | + DL_FLAG_AUTOREMOVE_CONSUMER); + /* * hdac_device core already sets the state to active and calls * get_noresume. So enable runtime and set the device to suspend. */ -- 2.7.4 _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx https://mailman.alsa-project.org/mailman/listinfo/alsa-devel
