ASoC: Don't restart an already running WM8958 DSP2

Don't want to upset the DSP.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@ti.com>
Cc: stable@kernel.org

diff --git a/sound/soc/codecs/wm8958-dsp2.c b/sound/soc/codecs/wm8958-dsp2.c
index ca26779..0293763 100644 (file)
--- a/sound/soc/codecs/wm8958-dsp2.c
+++ b/sound/soc/codecs/wm8958-dsp2.c
@@ -362,6 +362,10 @@ static void wm8958_dsp_apply(struct snd_soc_codec *codec, int path, int start)
                path, wm8994->dsp_active, start, pwr_reg, reg);
 
        if (start && ena) {
+               /* If the DSP is already running then noop */
+               if (reg & WM8958_DSP2_ENA)
+                       return;
+
                /* If either AIFnCLK is not yet enabled postpone */
                if (!(snd_soc_read(codec, WM8994_AIF1_CLOCKING_1)
                      & WM8994_AIF1CLK_ENA_MASK) &&