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dsp: remove float operations in excursion calculation

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Avoid float operation during excursion calculation
since that impacts CPU performance. Maintain the
same precision for 2 digit as per requirement
for final value to print in sys/class node.

Change-Id: I34d0f2e7b9eca499206ee9d30acf0d9121b0442e
Signed-off-by: Laxminath Kasam <lkasam@codeaurora.org>
This commit is contained in:
Laxminath Kasam 2019-03-11 14:59:56 +05:30 • committed by Gerrit - the friendly Code Review server
commit 366670efa7
1 changed files with 8 additions and 7 deletions
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15
dsp/sp_params.c
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@ -15,8 +15,9 @@
#define SPK_PARAMS "spk_params"
#define CLASS_NAME "cal_data"
#define BUF_SZ 20
#define Q27 (1<<27)
#define Q22 (1<<22)
#define Q13 (1<<13)
#define Q7 (1<<7)
struct afe_spk_ctl {
struct class *p_class;
@ -88,11 +89,11 @@ static ssize_t sp_max_excursion_l_show(struct device *dev,
{
ssize_t ret = 0;
int32_t ex_val_frac;
float ex_val;
int32_t ex_q27 = this_afe_spk.xt_logging.max_excursion[SP_V2_SPKR_1];
ex_val = (ex_q27 * 1.0)/Q27;
ex_val_frac = ex_val * 100;
ex_val_frac = ex_q27/Q13;
ex_val_frac = (ex_val_frac * 10000)/(Q7 * Q7);
ex_val_frac /= 100;
ret = snprintf(buf, BUF_SZ, "%d.%02d\n", 0, ex_val_frac);
this_afe_spk.xt_logging.max_excursion[SP_V2_SPKR_1] = 0;
return ret;
@ -105,11 +106,11 @@ static ssize_t sp_max_excursion_r_show(struct device *dev,
{
ssize_t ret = 0;
int32_t ex_val_frac;
float ex_val;
int32_t ex_q27 = this_afe_spk.xt_logging.max_excursion[SP_V2_SPKR_2];
ex_val = (ex_q27 * 1.0)/Q27;
ex_val_frac = ex_val * 100;
ex_val_frac = ex_q27/Q13;
ex_val_frac = (ex_val_frac * 10000)/(Q7 * Q7);
ex_val_frac /= 100;
ret = snprintf(buf, BUF_SZ, "%d.%02d\n", 0, ex_val_frac);
this_afe_spk.xt_logging.max_excursion[SP_V2_SPKR_2] = 0;
return ret;