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Drivers: DMIC: Make FIR decimation factor preference order configurable 

This patch changes the logic in function select_mode() to use
the defined FIR decimation filters as order of preference for
FIR decimation factors. The earlier logic was simply to select the
lowest decimation factor. It can be used to e.g. prefer decimation
factor 6 over 5 when both are possible.

The driver mode select behavior is not yet changed in this patch. The
filters are presented in increasing decimation factor order in the
header file. The preference order is changed in other patch.

Signed-off-by: Seppo Ingalsuo <seppo.ingalsuo@linux.intel.com>
This commit is contained in:
Seppo Ingalsuo 2020-11-09 20:54:22 +02:00 committed by Liam Girdwood
parent 1891a91e92
commit f5de034636
1 changed files with 18 additions and 7 deletions
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25
src/drivers/intel/dmic.c
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@ -533,14 +533,13 @@ static int select_mode(struct dai *dai,
int32_t gain_to_fir;
int16_t idx[DMIC_MAX_MODES];
int16_t *mfir;
int n = 1;
int mmin;
int count;
int mcic;
int bits_cic;
int ret;
int n;
int found = 0;
/* If there are more than one possibilities select a mode with lowest
/* If there are more than one possibilities select a mode with a preferred
* FIR decimation factor. If there are several select mode with highest
* ioclk divider to minimize microphone power consumption. The highest
* clock divisors are in the end of list so select the last of list.
@ -561,9 +560,21 @@ static int select_mode(struct dai *dai,
else
mfir = modes->mfir_b;
mmin = find_min_int16(mfir, modes->num_of_modes);
count = find_equal_int16(idx, mfir, mmin, modes->num_of_modes, 0);
n = idx[count - 1];
/* Search fir_list[] decimation factors from start towards end. The found
* last configuration entry with searched decimation factor will be used.
*/
for (n = 0; fir_list[n]; n++) {
found = find_equal_int16(idx, mfir, fir_list[n]->decim_factor,
modes->num_of_modes, 0);
if (found)
break;
}
if (!found) {
dai_err(dai, "select_mode(): No filter for decimation found");
return -EINVAL;
}
n = idx[found - 1]; /* Option with highest clock divisor and lowest mic clock rate */
/* Get microphone clock and decimation parameters for used mode from
* the list.