[alsa-devel] [PATCH] ALSA: hda - Haswell converter power state D0 verify

[Wang Xingchao]

Haswell converters maybe in wrong power state before usage.
i.e. only converter 0 is in D0, converter 1/2 are in D3.
When pin choose converter 1/2, there's no audio output, this
cause dependency when playing differnt stream on pins.

AUD_PWRST  ConvertorA_Widget_Power_State_Current        D0
AUD_PWRST  ConvertorA_Widget_Power_State_Requsted       D0
AUD_PWRST  ConvertorB_Widget_Power_State_Current        D3
AUD_PWRST  ConvertorB_Widget_Power_State_Requested      D3
AUD_PWRST  ConvC_Widget_PwrSt_Curr                      D3
AUD_PWRST  ConvC_Widget_PwrSt_Req                       D3

This patch check converter's power state and set D0 if it's in D3 mode.

Signed-off-by: Wang Xingchao <xingchao.wang at linux.intel.com>
---
 sound/pci/hda/patch_hdmi.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/sound/pci/hda/patch_hdmi.c b/sound/pci/hda/patch_hdmi.c
index e12f7a0..760eeb1 100644
--- a/sound/pci/hda/patch_hdmi.c
+++ b/sound/pci/hda/patch_hdmi.c
@@ -1018,10 +1018,19 @@ static void hdmi_unsol_event(struct hda_codec *codec, unsigned int res)
 		hdmi_non_intrinsic_event(codec, res);
 }
 
-static void haswell_verify_pin_D0(struct hda_codec *codec, hda_nid_t nid)
+static void haswell_verify_pin_D0(struct hda_codec *codec,
+		hda_nid_t cvt_nid, hda_nid_t nid)
 {
 	int pwr, lamp, ramp;
 
+	/* For Haswell, the converter 1/2 may keep in D3 state after bootup,
+	 * thus pins could only choose converter 0 for use. Make sure the
+	 * converters are in correct power state */
+	pwr = snd_hda_codec_read(codec, cvt_nid, 0, AC_VERB_GET_POWER_STATE, 0);
+	pwr = (pwr & AC_PWRST_ACTUAL) >> AC_PWRST_ACTUAL_SHIFT;
+	if (pwr != AC_PWRST_D0)
+		snd_hda_codec_write(codec, cvt_nid, 0, AC_VERB_SET_POWER_STATE, AC_PWRST_D0);
+
 	pwr = snd_hda_codec_read(codec, nid, 0, AC_VERB_GET_POWER_STATE, 0);
 	pwr = (pwr & AC_PWRST_ACTUAL) >> AC_PWRST_ACTUAL_SHIFT;
 	if (pwr != AC_PWRST_D0) {
@@ -1068,7 +1077,7 @@ static int hdmi_setup_stream(struct hda_codec *codec, hda_nid_t cvt_nid,
 	int new_pinctl = 0;
 
 	if (codec->vendor_id == 0x80862807)
-		haswell_verify_pin_D0(codec, pin_nid);
+		haswell_verify_pin_D0(codec, cvt_nid, pin_nid);
 
 	if (snd_hda_query_pin_caps(codec, pin_nid) & AC_PINCAP_HBR) {
 		pinctl = snd_hda_codec_read(codec, pin_nid, 0,
-- 
1.8.1.2