drm/i915: add SW tracking to FBC enabling

Currently, calling intel_fbc_enabled() will trigger a register read.
And we call it a lot of times, even when FBC is disabled, so saving a
few cycles would be a good thing.

Another reason for this patch is because we currently call
intel_fbc_enabled() while the HW is runtime suspended, so the read
makes no sense and triggers a WARN. This happens even if FBC is
disabled by default. Of course one could argue that we just shouldn't
be calling intel_fbc_enabled() while the driver is runtime suspended,
and I agree that's a good argument, but I still think that the reason
explained in the first paragraph already justifies the patch.
This problem can easily be reproduced with many subtests of
igt/pm_rpm, and it is a regression introduced by:

    commit c5ad011d7d256ecbe173324029e992817194d2b0
    Author: Rodrigo Vivi <rodrigo.vivi@intel.com>
    Date:   Mon Aug 4 03:51:38 2014 -0700
        drm/i915: FBC flush nuke for BDW

Testcase: igt/pm_rpm/cursor (and others)
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

2 files changed, 24 insertions, 11 deletions

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 5fce16c9d647..999bd57cab65 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -662,6 +662,10 @@ struct i915_fbc {
 
         bool false_color;
 
+        /* Tracks whether the HW is actually enabled, not whether the feature is
+         * possible. */
+        bool enabled;
+
         struct intel_fbc_work {
                 struct delayed_work work;
                 struct drm_crtc *crtc;
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 2ca9fdba7cb7..6b416201240f 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -71,6 +71,8 @@ static void i8xx_disable_fbc(struct drm_device *dev)
         struct drm_i915_private *dev_priv = dev->dev_private;
         u32 fbc_ctl;
 
+        dev_priv->fbc.enabled = false;
+
         /* Disable compression */
         fbc_ctl = I915_READ(FBC_CONTROL);
         if ((fbc_ctl & FBC_CTL_EN) == 0)
@@ -99,6 +101,8 @@ static void i8xx_enable_fbc(struct drm_crtc *crtc)
         int i;
         u32 fbc_ctl;
 
+        dev_priv->fbc.enabled = true;
+
         cfb_pitch = dev_priv->fbc.size / FBC_LL_SIZE;
         if (fb->pitches[0] < cfb_pitch)
                 cfb_pitch = fb->pitches[0];
@@ -153,6 +157,8 @@ static void g4x_enable_fbc(struct drm_crtc *crtc)
         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
         u32 dpfc_ctl;
 
+        dev_priv->fbc.enabled = true;
+
         dpfc_ctl = DPFC_CTL_PLANE(intel_crtc->plane) | DPFC_SR_EN;
         if (drm_format_plane_cpp(fb->pixel_format, 0) == 2)
                 dpfc_ctl |= DPFC_CTL_LIMIT_2X;
@@ -173,6 +179,8 @@ static void g4x_disable_fbc(struct drm_device *dev)
         struct drm_i915_private *dev_priv = dev->dev_private;
         u32 dpfc_ctl;
 
+        dev_priv->fbc.enabled = false;
+
         /* Disable compression */
         dpfc_ctl = I915_READ(DPFC_CONTROL);
         if (dpfc_ctl & DPFC_CTL_EN) {
@@ -224,6 +232,8 @@ static void ironlake_enable_fbc(struct drm_crtc *crtc)
         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
         u32 dpfc_ctl;
 
+        dev_priv->fbc.enabled = true;
+
         dpfc_ctl = DPFC_CTL_PLANE(intel_crtc->plane);
         if (drm_format_plane_cpp(fb->pixel_format, 0) == 2)
                 dev_priv->fbc.threshold++;
@@ -264,6 +274,8 @@ static void ironlake_disable_fbc(struct drm_device *dev)
         struct drm_i915_private *dev_priv = dev->dev_private;
         u32 dpfc_ctl;
 
+        dev_priv->fbc.enabled = false;
+
         /* Disable compression */
         dpfc_ctl = I915_READ(ILK_DPFC_CONTROL);
         if (dpfc_ctl & DPFC_CTL_EN) {
@@ -290,6 +302,8 @@ static void gen7_enable_fbc(struct drm_crtc *crtc)
         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
         u32 dpfc_ctl;
 
+        dev_priv->fbc.enabled = true;
+
         dpfc_ctl = IVB_DPFC_CTL_PLANE(intel_crtc->plane);
         if (drm_format_plane_cpp(fb->pixel_format, 0) == 2)
                 dev_priv->fbc.threshold++;
@@ -339,16 +353,7 @@ bool intel_fbc_enabled(struct drm_device *dev)
 {
         struct drm_i915_private *dev_priv = dev->dev_private;
 
-        /* If it wasn't never enabled by kernel parameter or platform default
-         * we can avoid reading registers so many times in vain
-         */
-        if (!i915.enable_fbc)
-                return false;
-
-        if (!dev_priv->display.fbc_enabled)
-                return false;
-
-        return dev_priv->display.fbc_enabled(dev);
+        return dev_priv->fbc.enabled;
 }
 
 void gen8_fbc_sw_flush(struct drm_device *dev, u32 value)
@@ -7360,8 +7365,10 @@ void intel_fini_runtime_pm(struct drm_i915_private *dev_priv)
 
 static void intel_init_fbc(struct drm_i915_private *dev_priv)
 {
-        if (!HAS_FBC(dev_priv))
+        if (!HAS_FBC(dev_priv)) {
+                dev_priv->fbc.enabled = false;
                 return;
+        }
 
         if (INTEL_INFO(dev_priv)->gen >= 7) {
                 dev_priv->display.fbc_enabled = ironlake_fbc_enabled;
@@ -7383,6 +7390,8 @@ static void intel_init_fbc(struct drm_i915_private *dev_priv)
                 /* This value was pulled out of someone's hat */
                 I915_WRITE(FBC_CONTROL, 500 << FBC_CTL_INTERVAL_SHIFT);
         }
+
+        dev_priv->fbc.enabled = dev_priv->display.fbc_enabled(dev_priv->dev);
 }
 
 /* Set up chip specific power management-related functions */