[PATCH 4/4] ALSA: hda - Add display audio routing API for haswell

[Wang Xingchao <xingchao.wang@linux.intel.com>]

ALSA side use these apis to know display audio routing map
in gfx side. And use the API to disable unused pin's audio output.

Signed-off-by: Wang Xingchao <xingchao.wang@linux.intel.com>
---
 sound/pci/hda/hda_i915.c   | 83 ++++++++++++++++++++++++++++++++++++++++++++++
 sound/pci/hda/hda_i915.h   |  4 +++
 sound/pci/hda/patch_hdmi.c | 20 +++++++++--
 3 files changed, 104 insertions(+), 3 deletions(-)

diff --git a/sound/pci/hda/hda_i915.c b/sound/pci/hda/hda_i915.c
index 76c13d5..7ac446f 100644
--- a/sound/pci/hda/hda_i915.c
+++ b/sound/pci/hda/hda_i915.c
@@ -22,9 +22,73 @@
 #include <drm/i915_powerwell.h>
 #include "hda_i915.h"
 
+/* Haswell power well */
 static void (*get_power)(void);
 static void (*put_power)(void);
 
+/* Haswell audio routing */
+static int (*get_using_pipe)(int);
+static int (*disable_unused_pipe)(int, int *);
+static int (*restore_eld)(void);
+
+#define i915_pipe_name(p) ((p) + 'A')
+
+static int busy_pins[3] = {0, 0, 0};
+
+int hdmi_disable_unused_pipe(int pin_idx, int pipe_idx)
+{
+	busy_pins[pin_idx] = 1;
+	if (disable_unused_pipe)
+		disable_unused_pipe(pipe_idx, busy_pins);
+
+	return 0;
+}
+EXPORT_SYMBOL(hdmi_disable_unused_pipe);
+
+void hdmi_restore_pineld(int pin_idx)
+{
+	busy_pins[pin_idx] = 0;
+	if (restore_eld)
+		restore_eld();
+}
+EXPORT_SYMBOL(hdmi_restore_pineld);
+
+int hdmi_get_using_pipe(int pin_idx)
+{
+	int pipe = -1;
+
+	if (get_using_pipe)
+		pipe = get_using_pipe(pin_idx);
+
+	if (pipe != -1)
+		snd_printd("HDMI: pin %d get using pipe %c\n", pin_idx, i915_pipe_name(pipe));
+
+	return pipe;
+}
+EXPORT_SYMBOL(hdmi_get_using_pipe);
+
+static int init_audio_routing(void)
+{
+	get_using_pipe = symbol_request(i915_using_pipe);
+	if (!get_using_pipe)
+		return -ENODEV;
+
+	disable_unused_pipe = symbol_request(i915_disable_pipe);
+	if (!disable_unused_pipe) {
+		get_using_pipe = NULL;
+		return -ENODEV;
+	}
+
+	restore_eld = symbol_request(i915_restore_pineld);
+	if (!restore_eld) {
+		restore_eld = NULL;
+		get_using_pipe = NULL;
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
 void hda_display_power(bool enable)
 {
 	if (!get_power || !put_power)
@@ -57,6 +121,10 @@ int hda_i915_init(void)
 
 	snd_printd("HDA driver get symbol successfully from i915 module\n");
 
+	err = init_audio_routing();
+	if (err < 0)
+		snd_printd("HDA driver get audior routing APIs failed!\n");
+
 	return err;
 }
 
@@ -71,5 +139,20 @@ int hda_i915_exit(void)
 		put_power = NULL;
 	}
 
+	if (get_using_pipe) {
+		symbol_put(get_using_pipe);
+		get_using_pipe = NULL;
+	}
+
+	if (disable_unused_pipe) {
+		symbol_put(disable_unused_pipe);
+		disable_unused_pipe = NULL;
+	}
+
+	if (restore_eld) {
+		symbol_put(restore_eld);
+		restore_eld = NULL;
+	}
+
 	return 0;
 }
diff --git a/sound/pci/hda/hda_i915.h b/sound/pci/hda/hda_i915.h
index 5a63da2..52d6f09 100644
--- a/sound/pci/hda/hda_i915.h
+++ b/sound/pci/hda/hda_i915.h
@@ -32,4 +32,8 @@ static inline int hda_i915_exit(void)
 }
 #endif
 
+extern int hdmi_get_using_pipe(int pin_idx);
+extern int hdmi_disable_unused_pipe(int pin_idx, int pipe_idx);
+extern void hdmi_restore_pineld(int pin_idx);
+
 #endif
diff --git a/sound/pci/hda/patch_hdmi.c b/sound/pci/hda/patch_hdmi.c
index d766f40..2a1e977 100644
--- a/sound/pci/hda/patch_hdmi.c
+++ b/sound/pci/hda/patch_hdmi.c
@@ -39,6 +39,7 @@
 #include "hda_codec.h"
 #include "hda_local.h"
 #include "hda_jack.h"
+#include "hda_i915.h"
 
 static bool static_hdmi_pcm;
 module_param(static_hdmi_pcm, bool, 0644);
@@ -1131,6 +1132,7 @@ static int hdmi_pcm_open(struct hda_pcm_stream *hinfo,
 	struct hdmi_spec_per_pin *per_pin;
 	struct hdmi_eld *eld;
 	struct hdmi_spec_per_cvt *per_cvt = NULL;
+	int pipe_idx;
 
 	/* Validate hinfo */
 	pin_idx = hinfo_to_pin_index(spec, hinfo);
@@ -1139,12 +1141,21 @@ static int hdmi_pcm_open(struct hda_pcm_stream *hinfo,
 	per_pin = get_pin(spec, pin_idx);
 	eld = &per_pin->sink_eld;
 
+	if (codec->vendor_id == 0x80862807) {
+		hsw_verify_cvt_D0(spec, codec);
+
+		pipe_idx = hdmi_get_using_pipe(pin_idx);
+		if (pipe_idx < 0)
+			snd_printdd("HDMI: Pin %d has no valid pipe in use\n", pin_idx);
+		else {
+			hdmi_disable_unused_pipe(pin_idx, pipe_idx);
+			msleep(10);
+		}
+	}
+
 	if (!eld->monitor_present || !eld->eld_valid)
 		return -EIO;
 
-	if (codec->vendor_id == 0x80862807)
-		hsw_verify_cvt_D0(spec, codec);
-		
 	/* Dynamically assign converter to stream */
 	for (cvt_idx = 0; cvt_idx < spec->num_cvts; cvt_idx++) {
 		per_cvt = get_cvt(spec, cvt_idx);
@@ -1514,6 +1525,9 @@ static int hdmi_pcm_close(struct hda_pcm_stream *hinfo,
 		snd_hda_spdif_ctls_unassign(codec, pin_idx);
 		per_pin->chmap_set = false;
 		memset(per_pin->chmap, 0, sizeof(per_pin->chmap));
+
+		if (codec->vendor_id == 0x80862807)
+			hdmi_restore_pineld(pin_idx);
 	}
 
 	return 0;
-- 
1.8.1.2