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ASoC: codec: hdac_hdmi add device_link to card device 

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@intel.com>
Reviewed-by: Takashi Iwai <tiwai@suse.de>
Acked-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: stable@vger.kernel.org
hifive-unleashed-5.2
Libin Yang 2019-04-13 21:18:12 +08:00 committed by Mark Brown
parent 52034add75
commit 01c8327667
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GPG Key ID: 24D68B725D5487D0
1 changed files with 11 additions and 0 deletions
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11
sound/soc/codecs/hdac_hdmi.c
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@ -1854,6 +1854,17 @@ static int hdmi_codec_probe(struct snd_soc_component *component)
/* Imp: Store the card pointer in hda_codec */
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.
* Let's use the flag DL_FLAG_AUTOREMOVE_CONSUMER. This can make
* sure the device link is freed when the machine driver is removed.
*/
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.