On 4/16/19 5:23 AM, Takashi Iwai wrote:
On Sat, 13 Apr 2019 15:18:12 +0200, libin.yang@intel.com wrote:
From: Libin Yang libin.yang@intel.com
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
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.