path: root/sound/pci/hda/patch_realtek.c
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authorMengdong Lin <mengdong.lin@intel.com>2015-04-21 13:12:23 +0800
committerTakashi Iwai <tiwai@suse.de>2015-04-21 07:58:36 +0200
commit40cc2392f4b144197d05eec73c1560f42fc25def (patch)
tree0f3b58289537adfcd9742efdd61a763df459fed4 /sound/pci/hda/patch_realtek.c
parentf4c1a311d8dc55c90c39e9cf7b003254a769574d (diff)
ALSA: hda - add AZX_DCAPS_I915_POWERWELL to Baytrail
This patch addes AZX_DCAPS_I915_POWERWELL to BYT (Baytrail). Like Braswell and Skylake, the HDMI codec on Bytrail is also in the shared power well with GPU. This power well must be turned on before we reset link to probe the codec, to avoid communication failure with the codec. The side effect is that this power is always ON in S0 because the BYT HDMI codec does not support EPSS or D3ClkStop and so the controller doesn't enter D3 at runtime, and the HDMI codec and analog codec share a single physical HD-A link and so we cannot reset the HD-A link freely when we re-enable the power to use the HDMI codec. Next step is to test if an AGP reset or double AGP reset on BYT HDMI codec is okay to bring the HDMI codec back to a functional state after restoring the power. If okay, we can bind the power on/off with the HDMI codec PM without interrupting the analog audio. Signed-off-by: Mengdong Lin <mengdong.lin@intel.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/pci/hda/patch_realtek.c')
0 files changed, 0 insertions, 0 deletions

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