From: Ville Syrjälä Date: Tue, 26 May 2015 17:22:40 +0000 (+0300) Subject: drm/i915: Bump CHV PFI credits to 63 when cdclk>=czclk X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=fcc0008fd02330f1c539a8dd831b00ca9b998cd8;p=linux-beck.git drm/i915: Bump CHV PFI credits to 63 when cdclk>=czclk Switch from using 31 PFI credits to 63 PFI credits when cdclk>=czclk on CHV. The spec lists both 31 and 63 as "suggested" values, but based on feedback from hardware folks we should actually be using 63. Originally I picked the 31 basically by flipping a coin. Signed-off-by: Ville Syrjälä Reviewed-by: Clint Taylor Signed-off-by: Daniel Vetter --- diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index c4ccc376ae44..193ba79e5a41 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -6055,7 +6055,7 @@ static void vlv_program_pfi_credits(struct drm_i915_private *dev_priv) if (DIV_ROUND_CLOSEST(dev_priv->cdclk_freq, 1000) >= dev_priv->rps.cz_freq) { /* CHV suggested value is 31 or 63 */ if (IS_CHERRYVIEW(dev_priv)) - credits = PFI_CREDIT_31; + credits = PFI_CREDIT_63; else credits = PFI_CREDIT(15); } else {