[alsa-devel] [PATCH] ASoC: wm_adsp: Mimic legacy behaviour of reading controls when DSP is on

[Charles Keepax]

Older firmwares don't specify access flags for the controls,
unfortunately the usage of some of these firmware relies on being able
to read back values from the DSP. The current control code will only do
this for volatile controls. This patch will read the control from the
hardware if no flags are specified and the control is currently
enabled, which should cover these legacy use-cases.

Signed-off-by: Charles Keepax <ckeepax at opensource.wolfsonmicro.com>
---
 sound/soc/codecs/wm_adsp.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/sound/soc/codecs/wm_adsp.c b/sound/soc/codecs/wm_adsp.c
index b083642..d1e0826 100644
--- a/sound/soc/codecs/wm_adsp.c
+++ b/sound/soc/codecs/wm_adsp.c
@@ -666,6 +666,9 @@ static int wm_coeff_get(struct snd_kcontrol *kctl,
 		else
 			ret = -EPERM;
 	} else {
+		if (!ctl->flags && ctl->enabled)
+			ret = wm_coeff_read_control(ctl, ctl->cache, ctl->len);
+
 		memcpy(p, ctl->cache, ctl->len);
 	}
 
-- 
2.1.4