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    • Takashi Iwai's avatar
      ALSA: hda - Enable runtime PM only for discrete GPU · 37a3a98e
      Takashi Iwai authored
      The recent change of vga_switcheroo allowed the runtime PM for
      HD-audio on AMD GPUs, but this also resulted in a regression.  When
      the HD-audio controller driver gets runtime-suspended, HD-audio link
      is turned off, and the hotplug notification is ignored.  This leads to
      the inconsistent audio state (the connection isn't notified and ELD is
      ignored).
      
      The best fix would be to implement the proper ELD notification via the
      audio component, but it's still not ready.  As a quick workaround,
      this patch adds the check of runtime_idle and allows the runtime
      suspend only when the vga_switcheroo is bound with discrete GPU.
      That is, a system with a single GPU and APU would be again without
      runtime PM to keep the HD-audio link for the hotplug notification and
      ELD read out.
      
      Also, the codec->auto_runtime_pm flag is set only for the discrete GPU
      at the time GPU gets bound via vga_switcheroo (i.e. only dGPU is
      forcibly runtime-PM enabled), so that APU can still get the ELD
      notification.
      
      For identifying which GPU is bound, a new vga_switcheroo client
      callback, gpu_bound, is implemented.  The vga_switcheroo simply calls
      this when GPU is bound, and tells whether it's dGPU or APU.
      
      Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=200945
      
      
      Fixes: 07f4f97d ("vga_switcheroo: Use device link for HDA controller")
      Reported-by: default avatarJian-Hong Pan <jian-hong@endlessm.com>
      Tested-by: default avatarJian-Hong Pan <jian-hong@endlessm.com>
      Acked-by: default avatarLukas Wunner <lukas@wunner.de>
      Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
      37a3a98e
  9. Sep 11, 2018
  10. Aug 30, 2018
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