From f4c1a311d8dc55c90c39e9cf7b003254a769574d Mon Sep 17 00:00:00 2001 From: Mengdong Lin Date: Mon, 20 Apr 2015 17:33:57 +0800 Subject: ALSA: hda - only sync BCLK to the display clock for Haswell & Broadwell Only Intel Haswell and Broadwell have a separate HD-A controller (PCI device 3) for display audio, which needs to get 24MHz HD-A link BCLK from the variable display core clock through vendor specific registers EM4 & EM5. Other platforms (Baytrail, Braswell and Skylake) don't have this feature. So this patch checks the PCI device ID of the controller in haswell_set_bclk() and only sync BCLK for HSW and BDW. Signed-off-by: Mengdong Lin Signed-off-by: Takashi Iwai --- sound/pci/hda/hda_i915.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/sound/pci/hda/hda_i915.c b/sound/pci/hda/hda_i915.c index 52a85d87c23c..3052a2b095f7 100644 --- a/sound/pci/hda/hda_i915.c +++ b/sound/pci/hda/hda_i915.c @@ -55,6 +55,12 @@ void haswell_set_bclk(struct hda_intel *hda) int cdclk_freq; unsigned int bclk_m, bclk_n; struct i915_audio_component *acomp = &hda->audio_component; + struct pci_dev *pci = hda->chip.pci; + + /* Only Haswell/Broadwell need set BCLK */ + if (pci->device != 0x0a0c && pci->device != 0x0c0c + && pci->device != 0x0d0c && pci->device != 0x160c) + return; if (!acomp->ops) return; -- cgit v1.2.3-58-ga151