Re: [alsa-devel] [PATCH v2 2/9] ALSA: hda - add helper to get channels from cap bits

On Tue, 12 Apr 2016 11:56:10 +0200, Subhransu S. Prusty wrote:

This helper is copied from legacy hda driver.

Signed-off-by: Subhransu S. Prusty subhransu.s.prusty@intel.com Signed-off-by: Vinod Koul vinod.koul@intel.com

---

sound/hda/local.h | 10 ++++++++++ 1 file changed, 10 insertions(+)

diff --git a/sound/hda/local.h b/sound/hda/local.h index d692f41..57f07d7 100644 --- a/sound/hda/local.h +++ b/sound/hda/local.h @@ -16,6 +16,16 @@ static inline int get_wcaps_type(unsigned int wcaps) return (wcaps & AC_WCAP_TYPE) >> AC_WCAP_TYPE_SHIFT; }

+static inline unsigned int get_wcaps_channels(u32 wcaps) +{

• unsigned int chans;
• chans = (wcaps & AC_WCAP_CHAN_CNT_EXT) >> 13;
• chans = ((chans << 1) | 1) + 1;

Let's make it simple. This is equivalent with chans = (chans + 1) * 2;

Takashi