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skl_compute_wrpll: Cycle through dividers, then central freqs

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Follow Paulo's comment on the corresponding kernel patch.

This means we also have to move the break when we have cycled through
the even dividers as well.

This improves the number of even dividers used across the tested
frequencies (373) (at the expense of a slightly worse average deviation,
but "even dividers take precedence over a lower deviation".

before:
  even/odd dividers: 338/35
  average deviation: 206.52

after:
  even/odd dividers: 363/10
  average deviation: 215.13

Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
This commit is contained in:
Damien Lespiau 2015-06-25 12:21:27 +01:00
parent efd2895f23
commit afdaeabbcf
1 changed files with 9 additions and 9 deletions
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18
tools/skl_compute_wrpll.c
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@ -422,8 +422,8 @@ skl_ddi_calculate_wrpll2(int clock /* in Hz */,
skl_wrpll_context_init(&ctx);
for (dco = 0; dco < ARRAY_SIZE(dco_central_freq); dco++) {
for (d = 0; d < ARRAY_SIZE(dividers); d++) {
for (d = 0; d < ARRAY_SIZE(dividers); d++) {
for (dco = 0; dco < ARRAY_SIZE(dco_central_freq); dco++) {
for (i = 0; i < dividers[d].n_dividers; i++) {
unsigned int p = dividers[d].list[i];
uint64_t dco_freq = p * afe_clock;
@ -433,14 +433,14 @@ skl_ddi_calculate_wrpll2(int clock /* in Hz */,
dco_freq,
p);
}
/*
* If a solution is found with an even divider, prefer
* this one.
*/
if (d == 0 && ctx.p)
break;
}
/*
* If a solution is found with an even divider, prefer
* this one.
*/
if (d == 0 && ctx.p)
break;
}
if (!ctx.p)