[alsa-devel] [PATCH] ALSA: hda - Enable runtime pm for Haswell

[Wang Xingchao]

Haswell doesnot support runtime pm by default.
This patch let haswell Display HD-A controller enter
runtime suspend, and bring more power saving whith power-well.

Signed-off-by: Wang Xingchao <xingchao.wang at linux.intel.com>
---
 sound/pci/hda/hda_intel.c |    6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
index bf27693..eb25888 100644
--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -3755,6 +3755,12 @@ static int azx_probe(struct pci_dev *pci,
 
 	if (pci_dev_run_wake(pci))
 		pm_runtime_put_noidle(&pci->dev);
+	else if (chip->driver_caps
+			& AZX_DCAPS_I915_POWERWELL) {
+		/* Haswell doesnot support runtime pm by default */
+		pm_runtime_put_noidle(&pci->dev);
+		pm_runtime_allow(&pci->dev);
+	}
 
 	dev++;
 	complete_all(&chip->probe_wait);
-- 
1.7.9.5