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    SubjectRe: [PATCH linux-next v2] ASoC: adau1373: adau1373_hw_params: Silence overflow warning
    On 03/11/2013 08:18 PM, Tim Gardner wrote:
    > ADAU1373_BCLKDIV_SOURCE is defined as BIT(5) which uses UL constants. On
    > amd64 the result of the ones complement operator is then truncated to
    > unsigned int according to the prototype of snd_soc_update_bits(). I think
    > gcc is correctly warning that the upper 32 bits are lost.
    >
    > sound/soc/codecs/adau1373.c: In function 'adau1373_hw_params':
    > sound/soc/codecs/adau1373.c:940:3: warning: large integer implicitly truncated to unsigned type [-Woverflow]
    >
    > gcc version 4.6.3
    >
    > Add 2 more BCLKDIV mask macros as explained by Lars:
    >
    > The BCLKDIV has three fields. The bitclock divider (bit 0-1), the samplerate
    > (bit 2-4) and the source select (bit 5). Here we want to update the bitclock
    > divider field and the samplerate field. When I wrote the code I was lazy and
    > used ~ADAU1373_BCLKDIV_SOURCE as the mask, which for this register is
    > functionally equivalent to ADAU1373_BCLKDIV_SR_MASK | ADAU1373_BCLKDIV_BCLK_MASK.
    >
    > Cc: Lars-Peter Clausen <lars@metafoo.de>
    > Cc: Liam Girdwood <lgirdwood@gmail.com>
    > Cc: Mark Brown <broonie@opensource.wolfsonmicro.com>
    > Cc: Jaroslav Kysela <perex@perex.cz>
    > Cc: Takashi Iwai <tiwai@suse.de>
    > Cc: device-drivers-devel@blackfin.uclinux.org
    > Cc: alsa-devel@alsa-project.org
    > Signed-off-by: Tim Gardner <tim.gardner@canonical.com>

    Acked-by: Lars-Peter Clausen <lars@metafoo.de>

    Thanks.

    > ---
    > v1 - simple cast solution
    > v2 - Implement a full set of field masks as suggested by Lars.
    >
    > sound/soc/codecs/adau1373.c | 5 ++++-
    > 1 file changed, 4 insertions(+), 1 deletion(-)
    >
    > diff --git a/sound/soc/codecs/adau1373.c b/sound/soc/codecs/adau1373.c
    > index 068b3ae..1aa10dd 100644
    > --- a/sound/soc/codecs/adau1373.c
    > +++ b/sound/soc/codecs/adau1373.c
    > @@ -133,6 +133,8 @@ struct adau1373 {
    > #define ADAU1373_DAI_FORMAT_DSP 0x3
    >
    > #define ADAU1373_BCLKDIV_SOURCE BIT(5)
    > +#define ADAU1373_BCLKDIV_SR_MASK (0x07 << 2)
    > +#define ADAU1373_BCLKDIV_BCLK_MASK 0x03
    > #define ADAU1373_BCLKDIV_32 0x03
    > #define ADAU1373_BCLKDIV_64 0x02
    > #define ADAU1373_BCLKDIV_128 0x01
    > @@ -937,7 +939,8 @@ static int adau1373_hw_params(struct snd_pcm_substream *substream,
    > adau1373_dai->enable_src = (div != 0);
    >
    > snd_soc_update_bits(codec, ADAU1373_BCLKDIV(dai->id),
    > - ~ADAU1373_BCLKDIV_SOURCE, (div << 2) | ADAU1373_BCLKDIV_64);
    > + ADAU1373_BCLKDIV_SR_MASK | ADAU1373_BCLKDIV_BCLK_MASK,
    > + (div << 2) | ADAU1373_BCLKDIV_64);
    >
    > switch (params_format(params)) {
    > case SNDRV_PCM_FORMAT_S16_LE:



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