From fbfe69836c088bcc0c5a0f32e788d3aef5f66aca Mon Sep 17 00:00:00 2001
From: Mark Brown <broonie@opensource.wolfsonmicro.com>
Date: Mon, 23 Jul 2012 20:14:43 +0100
Subject: [PATCH] ASoC: wm8994: Implement support for self-oscillation mode in
 the FLL

The FLLs in the WM8994 series devices can be started without any reference
being supplied, mainly for use in analogue bypass cases. Implement support
for this mode.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
---
 sound/soc/codecs/wm8994.c | 21 +++++++++++++++------
 sound/soc/codecs/wm8994.h |  9 +++++----
 2 files changed, 20 insertions(+), 10 deletions(-)

diff --git a/sound/soc/codecs/wm8994.c b/sound/soc/codecs/wm8994.c
index 04ef03175c51..2c9b8b7fdf3d 100644
--- a/sound/soc/codecs/wm8994.c
+++ b/sound/soc/codecs/wm8994.c
@@ -2102,6 +2102,10 @@ static int _wm8994_set_fll(struct snd_soc_codec *codec, int id, int src,
 	case WM8994_FLL_SRC_LRCLK:
 	case WM8994_FLL_SRC_BCLK:
 		break;
+	case WM8994_FLL_SRC_INTERNAL:
+		freq_in = 12000000;
+		freq_out = 12000000;
+		break;
 	default:
 		return -EINVAL;
 	}
@@ -2164,9 +2168,11 @@ static int _wm8994_set_fll(struct snd_soc_codec *codec, int id, int src,
 				    fll.n << WM8994_FLL1_N_SHIFT);
 
 	snd_soc_update_bits(codec, WM8994_FLL1_CONTROL_5 + reg_offset,
-			    WM8958_FLL1_BYP |
+			    WM8994_FLL1_FRC_NCO | WM8958_FLL1_BYP |
 			    WM8994_FLL1_REFCLK_DIV_MASK |
 			    WM8994_FLL1_REFCLK_SRC_MASK,
+			    ((src == WM8994_FLL_SRC_INTERNAL)
+			     << WM8994_FLL1_FRC_NCO_SHIFT) |
 			    (fll.clk_ref_div << WM8994_FLL1_REFCLK_DIV_SHIFT) |
 			    (src - 1));
 
@@ -2192,13 +2198,16 @@ static int _wm8994_set_fll(struct snd_soc_codec *codec, int id, int src,
 			}
 		}
 
+		reg = WM8994_FLL1_ENA;
+
 		if (fll.k)
-			reg = WM8994_FLL1_ENA | WM8994_FLL1_FRAC;
-		else
-			reg = WM8994_FLL1_ENA;
+			reg |= WM8994_FLL1_FRAC;
+		if (src == WM8994_FLL_SRC_INTERNAL)
+			reg |= WM8994_FLL1_OSC_ENA;
+
 		snd_soc_update_bits(codec, WM8994_FLL1_CONTROL_1 + reg_offset,
-				    WM8994_FLL1_ENA | WM8994_FLL1_FRAC,
-				    reg);
+				    WM8994_FLL1_ENA | WM8994_FLL1_OSC_ENA |
+				    WM8994_FLL1_FRAC, reg);
 
 		if (wm8994->fll_locked_irq) {
 			timeout = wait_for_completion_timeout(&wm8994->fll_locked[id],
diff --git a/sound/soc/codecs/wm8994.h b/sound/soc/codecs/wm8994.h
index d77e06f0a675..19068d8fa301 100644
--- a/sound/soc/codecs/wm8994.h
+++ b/sound/soc/codecs/wm8994.h
@@ -28,10 +28,11 @@
 #define WM8994_FLL1 1
 #define WM8994_FLL2 2
 
-#define WM8994_FLL_SRC_MCLK1  1
-#define WM8994_FLL_SRC_MCLK2  2
-#define WM8994_FLL_SRC_LRCLK  3
-#define WM8994_FLL_SRC_BCLK   4
+#define WM8994_FLL_SRC_MCLK1    1
+#define WM8994_FLL_SRC_MCLK2    2
+#define WM8994_FLL_SRC_LRCLK    3
+#define WM8994_FLL_SRC_BCLK     4
+#define WM8994_FLL_SRC_INTERNAL 5
 
 enum wm8994_vmid_mode {
 	WM8994_VMID_NORMAL,
-- 
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