From 6bcda4f0dfcbe78349b5b283af892913299c8b2a Mon Sep 17 00:00:00 2001 From: =?utf8?q?Ville=20Syrj=C3=A4l=C3=A4?= Date: Tue, 7 Oct 2014 17:41:22 +0300 Subject: [PATCH] drm/i915: Cache HPLL frequency on VLV/CHV MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit We need the HPLL frequency when calculating cdclk. Currently we read that out from the hardware every single time, which isn't going to fly very well if the device is runtime suspended. So cache the HPLL frequency in dev_priv and use the cached value. Signed-off-by: Ville Syrjälä Reference: https://bugs.freedesktop.org/show_bug.cgi?id=82939 Reviewed-by: Imre Deak Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/i915_drv.h | 1 + drivers/gpu/drm/i915/intel_display.c | 14 +++++++------- 2 files changed, 8 insertions(+), 7 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index 2dc888ca3394..8fb8eba08dc6 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -1613,6 +1613,7 @@ struct drm_i915_private { unsigned int fsb_freq, mem_freq, is_ddr3; unsigned int vlv_cdclk_freq; + unsigned int hpll_freq; /** * wq - Driver workqueue for GEM. diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index cb0f32fd3b5c..3f4a5b83bea4 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -4756,10 +4756,9 @@ static void valleyview_set_cdclk(struct drm_device *dev, int cdclk) mutex_unlock(&dev_priv->rps.hw_lock); if (cdclk == 400000) { - u32 divider, vco; + u32 divider; - vco = valleyview_get_vco(dev_priv); - divider = DIV_ROUND_CLOSEST(vco << 1, cdclk) - 1; + divider = DIV_ROUND_CLOSEST(dev_priv->hpll_freq << 1, cdclk) - 1; mutex_lock(&dev_priv->dpio_lock); /* adjust cdclk divider */ @@ -4838,8 +4837,7 @@ static void cherryview_set_cdclk(struct drm_device *dev, int cdclk) static int valleyview_calc_cdclk(struct drm_i915_private *dev_priv, int max_pixclk) { - int vco = valleyview_get_vco(dev_priv); - int freq_320 = (vco << 1) % 320000 != 0 ? 333333 : 320000; + int freq_320 = (dev_priv->hpll_freq << 1) % 320000 != 0 ? 333333 : 320000; /* FIXME: Punit isn't quite ready yet */ if (IS_CHERRYVIEW(dev_priv->dev)) @@ -5544,7 +5542,6 @@ static int intel_crtc_compute_config(struct intel_crtc *crtc, static int valleyview_get_display_clock_speed(struct drm_device *dev) { struct drm_i915_private *dev_priv = dev->dev_private; - int vco = valleyview_get_vco(dev_priv); u32 val; int divider; @@ -5552,6 +5549,9 @@ static int valleyview_get_display_clock_speed(struct drm_device *dev) if (IS_CHERRYVIEW(dev)) return 400000; + if (dev_priv->hpll_freq == 0) + dev_priv->hpll_freq = valleyview_get_vco(dev_priv); + mutex_lock(&dev_priv->dpio_lock); val = vlv_cck_read(dev_priv, CCK_DISPLAY_CLOCK_CONTROL); mutex_unlock(&dev_priv->dpio_lock); @@ -5562,7 +5562,7 @@ static int valleyview_get_display_clock_speed(struct drm_device *dev) (divider << DISPLAY_FREQUENCY_STATUS_SHIFT), "cdclk change in progress\n"); - return DIV_ROUND_CLOSEST(vco << 1, divider + 1); + return DIV_ROUND_CLOSEST(dev_priv->hpll_freq << 1, divider + 1); } static int i945_get_display_clock_speed(struct drm_device *dev) -- 2.20.1