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authorTakashi Iwai <tiwai@suse.de>2013-05-08 06:09:34 (GMT)
committerTakashi Iwai <tiwai@suse.de>2013-05-08 06:24:57 (GMT)
commit17df3f55652f7ea8fb1197b5c32e227b3da9f215 (patch)
treeaab1cb7a8737524cfccf8d581176ef841b367f89 /Documentation/SubmitChecklist
parent2195b063f6609e4c6268f291683902f25eaf9aa6 (diff)
downloadlinux-fsl-qoriq-17df3f55652f7ea8fb1197b5c32e227b3da9f215.tar.xz
ALSA: hda - Apply pin-enablement workaround to all Haswell HDMI codecs
This is a revised patch based on Mengdong Lin's fix patch, which is a supplement to a previous patch [1611a9c9: ALSA: hda - Add fixup for Haswell to enable all pin and convertor widgets]. Some Haswell BIOS will disable the 2nd and 3rd pin/covertor widgets when the HD-A controller changes state from D3 to D0. So when the controller resumes after a system or runtime suspend, these widgets are disabled and programming these widgets to D0 will cause H/W error and codec will not respond. In addition, we found out that some BIOS disables the pins at S3 although it shows up at boot. This confuses the driver utterly, and the hardware falls into the fatal communication error like the above. So in this patch, we apply intel_haswell_enable_all_pins() not only as a fixup to a certain device (with 8086:2010) but to all Haswell machines. The codec driver basically assumes that all pins are exposed, so it's anyway better to see them from the beginning. Even if all pins and converters are shown by this call, there should be no regression in practice: the pin default configurations are still kept, thus the disabled pins are handled as disabled by the driver properly. Signed-off-by: Mengdong Lin <mengdong.lin@intel.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
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