ASoC: Store DC offset correction for wm_hubs devices in class W mode

Providing the analogue configuration of the output path remains the same
the DC offset corrected by the DC servo will remain identical so we can
skip the callibration, reducing the startup time for the headphone output.
Implement this for the wm_hubs devices as has been done for several other
CODECs.

Don't do this if we have any analogue paths enabled since offsets may be
being introduced by the analogue paths which could vary outside the
control of the driver.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>

1 files changed, 3 insertions, 0 deletions

diff --git a/sound/soc/codecs/wm8994.c b/sound/soc/codecs/wm8994.c
index 0db59c3aa5d4..3f70dee048b0 100644
--- a/sound/soc/codecs/wm8994.c
+++ b/sound/soc/codecs/wm8994.c
@@ -2228,6 +2228,7 @@ static int clk_sys_event(struct snd_soc_dapm_widget *w,
 
 static void wm8994_update_class_w(struct snd_soc_codec *codec)
 {
+        struct wm8994_priv *wm8994 = snd_soc_codec_get_drvdata(codec);
         int enable = 1;
         int source = 0;  /* GCC flow analysis can't track enable */
         int reg, reg_r;
@@ -2278,11 +2279,13 @@ static void wm8994_update_class_w(struct snd_soc_codec *codec)
                                     WM8994_CP_DYN_PWR |
                                     WM8994_CP_DYN_SRC_SEL_MASK,
                                     source | WM8994_CP_DYN_PWR);
+                wm8994->hubs.class_w = true;
                 
         } else {
                 dev_dbg(codec->dev, "Class W disabled\n");
                 snd_soc_update_bits(codec, WM8994_CLASS_W_1,
                                     WM8994_CP_DYN_PWR, 0);
+                wm8994->hubs.class_w = false;
         }
 }