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Commit 6fe72865 authored by Ville Syrjälä's avatar Ville Syrjälä Committed by Daniel Vetter
Browse files

drm/i915: Streamline VLV forcewake handling 



It occured to me that when we're trying to wake up both render
and media wells on VLV, we might end up calling the low level
force_wake_get/put two times even though one call would be
enough. Make that happen by figuring out which wells really
need to be woken up based on the forcewake counts.

Signed-off-by: default avatarVille Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: default avatarDeepak S <deepak.s@intel.com>
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
parent fc9d83f7

drivers/gpu/drm/i915/intel_uncore.c

+29 −41
Original line number Diff line number Diff line
@@ -257,16 +257,16 @@ void vlv_force_wake_get(struct drm_i915_private *dev_priv, 
	unsigned long irqflags;



	spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);

	if (FORCEWAKE_RENDER & fw_engine) {

		if (dev_priv->uncore.fw_rendercount++ == 0)

			dev_priv->uncore.funcs.force_wake_get(dev_priv,

							FORCEWAKE_RENDER);

	}

	if (FORCEWAKE_MEDIA & fw_engine) {

		if (dev_priv->uncore.fw_mediacount++ == 0)

			dev_priv->uncore.funcs.force_wake_get(dev_priv,

							FORCEWAKE_MEDIA);

	}



	if (fw_engine & FORCEWAKE_RENDER &&

	    dev_priv->uncore.fw_rendercount++ != 0)

		fw_engine &= ~FORCEWAKE_RENDER;

	if (fw_engine & FORCEWAKE_MEDIA &&

	    dev_priv->uncore.fw_mediacount++ != 0)

		fw_engine &= ~FORCEWAKE_MEDIA;



	if (fw_engine)

		dev_priv->uncore.funcs.force_wake_get(dev_priv, fw_engine);



	spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);

}
@@ -278,19 +278,15 @@ void vlv_force_wake_put(struct drm_i915_private *dev_priv, 


	spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);



	if (FORCEWAKE_RENDER & fw_engine) {

		WARN_ON(dev_priv->uncore.fw_rendercount == 0);

		if (--dev_priv->uncore.fw_rendercount == 0)

			dev_priv->uncore.funcs.force_wake_put(dev_priv,

							FORCEWAKE_RENDER);

	}

	if (fw_engine & FORCEWAKE_RENDER &&

	    --dev_priv->uncore.fw_rendercount != 0)

		fw_engine &= ~FORCEWAKE_RENDER;

	if (fw_engine & FORCEWAKE_MEDIA &&

	    --dev_priv->uncore.fw_mediacount != 0)

		fw_engine &= ~FORCEWAKE_MEDIA;



	if (FORCEWAKE_MEDIA & fw_engine) {

		WARN_ON(dev_priv->uncore.fw_mediacount == 0);

		if (--dev_priv->uncore.fw_mediacount == 0)

			dev_priv->uncore.funcs.force_wake_put(dev_priv,

							FORCEWAKE_MEDIA);

	}

	if (fw_engine)

		dev_priv->uncore.funcs.force_wake_put(dev_priv, fw_engine);



	spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);

}
@@ -516,27 +512,19 @@ gen6_read##x(struct drm_i915_private *dev_priv, off_t reg, bool trace) { \ 
static u##x \

vlv_read##x(struct drm_i915_private *dev_priv, off_t reg, bool trace) { \

	unsigned fwengine = 0; \

	unsigned fwcount; \

	REG_READ_HEADER(x); \

	if (FORCEWAKE_VLV_RENDER_RANGE_OFFSET(reg)) { \

		if (dev_priv->uncore.fw_rendercount == 0) \

			fwengine = FORCEWAKE_RENDER; \

		fwcount = dev_priv->uncore.fw_rendercount;    \

	}                                               \

	else if (FORCEWAKE_VLV_MEDIA_RANGE_OFFSET(reg)) {       \

	} else if (FORCEWAKE_VLV_MEDIA_RANGE_OFFSET(reg)) { \

		if (dev_priv->uncore.fw_mediacount == 0) \

			fwengine = FORCEWAKE_MEDIA; \

		fwcount = dev_priv->uncore.fw_mediacount;     \

	}  \

	if (fwengine != 0) {		\

		if (fwcount == 0) \

			(dev_priv)->uncore.funcs.force_wake_get(dev_priv, \

								fwengine); \

	if (fwengine) \

		dev_priv->uncore.funcs.force_wake_get(dev_priv, fwengine); \

	val = __raw_i915_read##x(dev_priv, reg); \

		if (fwcount == 0) \

			(dev_priv)->uncore.funcs.force_wake_put(dev_priv, \

							fwengine); \

	} else { \

		val = __raw_i915_read##x(dev_priv, reg); \

	} \

	if (fwengine) \

		dev_priv->uncore.funcs.force_wake_put(dev_priv, fwengine); \

	REG_READ_FOOTER; \

}