From 267db663458a8077a087674fb85ea95f540d8671 Mon Sep 17 00:00:00 2001 From: Damien Lespiau Date: Thu, 25 Jun 2015 16:19:24 +0100 Subject: [PATCH] drm/i915/skl: Prefer even dividers for SKL DPLLs Currently, if an odd divider improves the deviation (minimizes it), we take that divider. The recommendation is to prefer even dividers. v2: Move the check at the right place after having inverted the two for loops in the previous patch. Signed-off-by: Damien Lespiau Reviewed-by: Paulo Zanoni Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/intel_ddi.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c index 6e964ef7dfda..f6b3ccc4ab66 100644 --- a/drivers/gpu/drm/i915/intel_ddi.c +++ b/drivers/gpu/drm/i915/intel_ddi.c @@ -1317,6 +1317,13 @@ skl_ddi_calculate_wrpll(int clock /* in Hz */, p); } } + + /* + * If a solution is found with an even divider, prefer + * this one. + */ + if (d == 0 && ctx.p) + break; } if (!ctx.p) { -- 2.11.0