From a7f6e231150c93c4e15f258f0d4b1ffe97da3971 Mon Sep 17 00:00:00 2001 From: Deepak S Date: Sat, 9 May 2015 18:04:44 +0530 Subject: [PATCH] drm/i915/vlv: Remove wait for for punit to updates freq. MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit When GPU is idle on VLV, Request freq to punit should be good enough to get the voltage back to VNN. Also, make sure gfx clock force applies before requesting the freq fot vlv. v2: Do forcewake before setting idle frequency (ville) Update function comments to match the code (Deepak) v3: Fix get/put across idle frequency Request. (Ville) Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=75244 suggested-by: Jesse Barnes Signed-off-by: Deepak S Reviewed-by: Ville Syrjälä Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/intel_pm.c | 41 +++++++++------------------------ 1 file changed, 11 insertions(+), 30 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c index f08264ca1d30..d22bba98d83f 100644 --- a/drivers/gpu/drm/i915/intel_pm.c +++ b/drivers/gpu/drm/i915/intel_pm.c @@ -4097,51 +4097,32 @@ static void valleyview_set_rps(struct drm_device *dev, u8 val) trace_intel_gpu_freq_change(intel_gpu_freq(dev_priv, val)); } -/* vlv_set_rps_idle: Set the frequency to Rpn if Gfx clocks are down +/* vlv_set_rps_idle: Set the frequency to idle, if Gfx clocks are down * * * If Gfx is Idle, then - * 1. Mask Turbo interrupts - * 2. Bring up Gfx clock - * 3. Change the freq to Rpn and wait till P-Unit updates freq - * 4. Clear the Force GFX CLK ON bit so that Gfx can down - * 5. Unmask Turbo interrupts + * 1. Forcewake Media well. + * 2. Request idle freq. + * 3. Release Forcewake of Media well. */ static void vlv_set_rps_idle(struct drm_i915_private *dev_priv) { struct drm_device *dev = dev_priv->dev; u32 val = dev_priv->rps.idle_freq; - /* CHV and latest VLV don't need to force the gfx clock */ - if (IS_CHERRYVIEW(dev) || dev->pdev->revision >= 0xd) { + /* CHV don't need to force the gfx clock */ + if (IS_CHERRYVIEW(dev)) { valleyview_set_rps(dev_priv->dev, val); return; } - /* - * When we are idle. Drop to min voltage state. - */ - if (dev_priv->rps.cur_freq <= val) return; - /* Mask turbo interrupt so that they will not come in between */ - I915_WRITE(GEN6_PMINTRMSK, - gen6_sanitize_rps_pm_mask(dev_priv, ~0)); - - vlv_force_gfx_clock(dev_priv, true); - - dev_priv->rps.cur_freq = val; - - vlv_punit_write(dev_priv, PUNIT_REG_GPU_FREQ_REQ, val); - - if (wait_for(((vlv_punit_read(dev_priv, PUNIT_REG_GPU_FREQ_STS)) - & GENFREQSTATUS) == 0, 100)) - DRM_ERROR("timed out waiting for Punit\n"); - - gen6_set_rps_thresholds(dev_priv, val); - vlv_force_gfx_clock(dev_priv, false); - - I915_WRITE(GEN6_PMINTRMSK, gen6_rps_pm_mask(dev_priv, val)); + /* Wake up the media well, as that takes a lot less + * power than the Render well. */ + intel_uncore_forcewake_get(dev_priv, FORCEWAKE_MEDIA); + valleyview_set_rps(dev_priv->dev, val); + intel_uncore_forcewake_put(dev_priv, FORCEWAKE_MEDIA); } void gen6_rps_busy(struct drm_i915_private *dev_priv) -- 2.20.1