ALSA: hda - Force to link down at runtime suspend on ATI/AMD HDMI
Henning Kühn reported that the discrete AMD GPU on his hybrid graphics laptop no longer runtime-suspends due to the recent commit 07f4f97d ("vga_switcheroo: Use device link for HDA controller"). The root cause is that the HDMI codec on AMD GPU doesn't support CLKSTOP and EPSS, which are currently mandatory for powering down the HD-audio link at runtime suspend. Because the HD-audio link is still up, HD-audio controller driver blocks the transition to D3. For addressing the regression, this patch adds a new flag to indicate the forced link-down, and sets it for AMD HDMI codecs appropriately in the codec driver. Fixes: 07f4f97d ("vga_switcheroo: Use device link for HDA controller") Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=106957Reported-by: NLukas Wunner <lukas@wunner.de> Reported-and-tested-by: NHenning Kühn <prg@cooco.de> Cc: <stable@vger.kernel.org> # v4.17+ Signed-off-by: NTakashi Iwai <tiwai@suse.de>
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