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ASoC: codec: wm9860: avoid maybe-uninitialized warning

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The new PLL configuration code triggers a harmless warning:

sound/soc/codecs/wm8960.c: In function 'wm8960_configure_clocking':
sound/soc/codecs/wm8960.c:735:3: error: 'best_freq_out' may be used
uninitialized in this function [-Werror=maybe-uninitialized]
   wm8960_set_pll(codec, freq_in, best_freq_out);
   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
sound/soc/codecs/wm8960.c:699:12: note: 'best_freq_out' was declared
here

Fix this by reworking the code such that:

1) When there is no PLL freq available return -EINVAL and make
sure *bclk_idx, *dac_idx, *sysclk_idx are initialized with
invalid values.

2) When there is a PLL freq available initialize *bclk_idx,
*dac_idx and *sysclk_idx with correct values and immediately
return the freq available.

Fixes: 84fdc00d51 ("ASoC: codec: wm9860: Refactor PLL out freq search")
Fixes: 303e8954af ("ASoC: codec: wm8960: Stop when a matching PLL freq is found")
Suggested-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Daniel Baluta <daniel.baluta@nxp.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Daniel Baluta 2017-04-26 16:09:51 +03:00 committed by Mark Brown
parent 303e8954af
commit 66772eda0e
1 changed files with 9 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
sound/soc/codecs/wm8960.c
View File

@ -686,7 +686,7 @@ int wm8960_configure_sysclk(struct wm8960_priv *wm8960, int mclk,
* @bclk_idx: bclk_divs index for found bclk
*
* Returns:
* -1, in case no PLL frequency out available was found
* < 0, in case no PLL frequency out available was found
* >=0, in case we could derive bclk, lrclk, sysclk from PLL out using
* (@sysclk_idx, @dac_idx, @bclk_idx) dividers
*/
@ -696,13 +696,13 @@ int wm8960_configure_pll(struct snd_soc_codec *codec, int freq_in,
{
struct wm8960_priv *wm8960 = snd_soc_codec_get_drvdata(codec);
int sysclk, bclk, lrclk, freq_out;
int diff, best_freq_out;
int diff;
int i, j, k;
bclk = wm8960->bclk;
lrclk = wm8960->lrclk;
*bclk_idx = -1;
*sysclk_idx = *dac_idx = *bclk_idx = -1;
for (i = 0; i < ARRAY_SIZE(sysclk_divs); ++i) {
if (sysclk_divs[i] == -1)
@ -720,21 +720,12 @@ int wm8960_configure_pll(struct snd_soc_codec *codec, int freq_in,
*sysclk_idx = i;
*dac_idx = j;
*bclk_idx = k;
best_freq_out = freq_out;
break;
return freq_out;
}
}
if (k != ARRAY_SIZE(bclk_divs))
break;
}
if (j != ARRAY_SIZE(dac_divs))
break;
}
if (*bclk_idx != -1)
wm8960_set_pll(codec, freq_in, best_freq_out);
return *bclk_idx;
return -EINVAL;
}
static int wm8960_configure_clocking(struct snd_soc_codec *codec)
{
@ -783,11 +774,12 @@ static int wm8960_configure_clocking(struct snd_soc_codec *codec)
}
}
ret = wm8960_configure_pll(codec, freq_in, &i, &j, &k);
if (ret < 0) {
freq_out = wm8960_configure_pll(codec, freq_in, &i, &j, &k);
if (freq_out < 0) {
dev_err(codec->dev, "failed to configure clock via PLL\n");
return -EINVAL;
return freq_out;
}
wm8960_set_pll(codec, freq_in, freq_out);
configure_clock:
/* configure sysclk clock */