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drm/i915/skl: Skip remaining dividers when deviation is 0 

We can't improve a 0 deviation, so when we find such a divider, skip the
remaining ones they won't be better.

This short-circuit the search for 34 of the 373 test frequencies in the
corresponding i-g-t test (tools/skl_compute_wrpll)

v2: Place the short-circuiting code in skl_compute_wrpll() (Paulo)

(I'm sure nobody will notice the spurious removal of a blank line)

Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Suggested-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Damien Lespiau 2015-06-26 18:34:29 +01:00 committed by Daniel Vetter
parent 350405623f
commit e7ad987832
1 changed files with 8 additions and 1 deletions
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9
drivers/gpu/drm/i915/intel_ddi.c
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@ -1149,7 +1149,6 @@ static void skl_wrpll_try_divider(struct skl_wrpll_context *ctx,
ctx->dco_freq = dco_freq;
ctx->p = divider;
}
}
static void skl_wrpll_get_multipliers(unsigned int p,
@ -1315,9 +1314,17 @@ skl_ddi_calculate_wrpll(int clock /* in Hz */,
dco_central_freq[dco],
dco_freq,
p);
/*
* Skip the remaining dividers if we're sure to
* have found the definitive divider, we can't
* improve a 0 deviation.
*/
if (ctx.min_deviation == 0)
goto skip_remaining_dividers;
}
}
skip_remaining_dividers:
/*
* If a solution is found with an even divider, prefer
* this one.