On 4/16/19 5:23 AM, Takashi Iwai wrote:
On Sat, 13 Apr 2019 15:18:12 +0200,
libin.yang@xxxxxxxxx wrote:
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>
Reviewed-by: Takashi Iwai <tiwai@xxxxxxx>
Is it an issue that has been present for older released kernels?
If so, it deserves for Cc-to-stable.
Yes and no. In theory the same problem impacts the Skylake driver.
However its support for HDMI has been flaky at best, see e.g. the
probe/timing issues on Linus' laptop and a variety of devices in
December, and the only real distribution using it - ChromeOS - does not
resume from S3. Not to mention that products typically use 3.18 to 4.9.
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