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.zan...@intel.com>
Suggested-by: Paulo Zanoni <paulo.r.zan...@intel.com>
Signed-off-by: Damien Lespiau <damien.lesp...@intel.com>
---
drivers/gpu/drm/i915/intel_ddi.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index f6b3ccc..42c1487 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -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.
--
2.1.0
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