From f4ab408c4b55fcbc447cf0288456613bad824626 Mon Sep 17 00:00:00 2001 From: Tom O'Rourke Date: Wed, 19 Nov 2014 14:21:53 -0800 Subject: [PATCH] drm/i915: Keep min freq above floor on HSW/BDW Set the min_freq_softlimit to max(RPe, 450MHz). Setting a floor can ensure a minimum experience level. The 450MHz value came from a power and performance study of various types of workloads (3D, Media, GPGPU, idle, etc). v2: rebased Signed-off-by: Tom O'Rourke Reviewed-by: Chris Wilson Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/intel_pm.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c index eb2a0a8..6d0795d 100644 --- a/drivers/gpu/drm/i915/intel_pm.c +++ b/drivers/gpu/drm/i915/intel_pm.c @@ -4643,7 +4643,8 @@ static void gen6_init_rps_frequencies(struct drm_device *dev) if (dev_priv->rps.min_freq_softlimit == 0) { if (IS_HASWELL(dev) || IS_BROADWELL(dev)) dev_priv->rps.min_freq_softlimit = - dev_priv->rps.efficient_freq; + /* max(RPe, 450 MHz) */ + max(dev_priv->rps.efficient_freq, (u8) 9); else dev_priv->rps.min_freq_softlimit = dev_priv->rps.min_freq; -- 2.7.4