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ASoC: wm_adsp: Don't init cache from DSP memory if control is write-only

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For controls marked write-only don't initialize the cache from the
content of the DSP memory. We stil need the cache for any new data
that is written to this control, and we need to return something
for a read of the ALSA control because most user-side code assumes
all ALSA controls are readable. The cache is already created zero-
filled so the only change needed is to skip populating it from
DSP memory if the control isn't readable.

Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Richard Fitzgerald 2018-02-05 11:38:17 +00:00 committed by Mark Brown
parent 7928b2cbe5
commit 04ff40a983
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 10 additions and 3 deletions
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13
sound/soc/codecs/wm_adsp.c
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@ -1237,9 +1237,16 @@ static int wm_coeff_init_control_caches(struct wm_adsp *dsp)
if (ctl->flags & WMFW_CTL_FLAG_VOLATILE)
continue;
ret = wm_coeff_read_control(ctl, ctl->cache, ctl->len);
if (ret < 0)
return ret;
/*
* For readable controls populate the cache from the DSP memory.
* For non-readable controls the cache was zero-filled when
* created so we don't need to do anything.
*/
if (!ctl->flags || (ctl->flags & WMFW_CTL_FLAG_READABLE)) {
ret = wm_coeff_read_control(ctl, ctl->cache, ctl->len);
if (ret < 0)
return ret;
}
}
return 0;