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Commit 79f5b2c7 authored by Daniel Vetter's avatar Daniel Vetter
Browse files

drm/i915: make enable/disable_gt_powersave locking consistent 



The enable functions grabbed dev->struct_mutex themselves, whereas
the disable functions expected dev->struct_mutex to be held by the
caller. Move the locking out to the (currently only) callsite of
intel_enable_gt_powersave to make this more consistent.

Originally this was prep work for future patches, but I've chased down
a totally wrong alley. Still, I think this is a sensible
clarification.

Reviewed-by: default avatarEugeni Dodonov <eugeni.dodonov@intel.com>
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
parent 8090c6b9

drivers/gpu/drm/i915/intel_display.c

+2 −0
Original line number Diff line number Diff line
@@ -7174,7 +7174,9 @@ void intel_modeset_init_hw(struct drm_device *dev) 
{

	intel_init_clock_gating(dev);



	mutex_lock(&dev->struct_mutex);

	intel_enable_gt_powersave(dev);

	mutex_unlock(&dev->struct_mutex);



	if (IS_IVYBRIDGE(dev))

		ivb_pch_pwm_override(dev);

drivers/gpu/drm/i915/intel_pm.c

+13 −19
Original line number Diff line number Diff line
@@ -2349,8 +2349,9 @@ int intel_enable_rc6(const struct drm_device *dev) 
	return (INTEL_RC6_ENABLE | INTEL_RC6p_ENABLE);

}



static void gen6_enable_rps(struct drm_i915_private *dev_priv)

static void gen6_enable_rps(struct drm_device *dev)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	struct intel_ring_buffer *ring;

	u32 rp_state_cap;

	u32 gt_perf_status;
@@ -2359,6 +2360,8 @@ static void gen6_enable_rps(struct drm_i915_private *dev_priv) 
	int rc6_mode;

	int i;



	WARN_ON(!mutex_is_locked(&dev->struct_mutex));



	/* Here begins a magic sequence of register writes to enable

	 * auto-downclocking.

	 *
@@ -2366,7 +2369,6 @@ static void gen6_enable_rps(struct drm_i915_private *dev_priv) 
	 * userspace...

	 */

	I915_WRITE(GEN6_RC_STATE, 0);

	mutex_lock(&dev_priv->dev->struct_mutex);



	/* Clear the DBG now so we don't confuse earlier errors */

	if ((gtfifodbg = I915_READ(GTFIFODBG))) {
@@ -2491,15 +2493,17 @@ static void gen6_enable_rps(struct drm_i915_private *dev_priv) 
	I915_WRITE(GEN6_PMINTRMSK, 0);



	gen6_gt_force_wake_put(dev_priv);

	mutex_unlock(&dev_priv->dev->struct_mutex);

}



static void gen6_update_ring_freq(struct drm_i915_private *dev_priv)

static void gen6_update_ring_freq(struct drm_device *dev)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	int min_freq = 15;

	int gpu_freq, ia_freq, max_ia_freq;

	int scaling_factor = 180;



	WARN_ON(!mutex_is_locked(&dev->struct_mutex));



	max_ia_freq = cpufreq_quick_get_max(0);

	/*

	 * Default to measured freq if none found, PCU will ensure we don't go
@@ -2511,8 +2515,6 @@ static void gen6_update_ring_freq(struct drm_i915_private *dev_priv) 
	/* Convert from kHz to MHz */

	max_ia_freq /= 1000;



	mutex_lock(&dev_priv->dev->struct_mutex);



	/*

	 * For each potential GPU frequency, load a ring frequency we'd like

	 * to use for memory access.  We do this by specifying the IA frequency
@@ -2543,8 +2545,6 @@ static void gen6_update_ring_freq(struct drm_i915_private *dev_priv) 
			continue;

		}

	}



	mutex_unlock(&dev_priv->dev->struct_mutex);

}



static void ironlake_teardown_rc6(struct drm_device *dev)
@@ -2615,12 +2615,11 @@ void ironlake_enable_rc6(struct drm_device *dev) 
	if (!intel_enable_rc6(dev))

		return;



	mutex_lock(&dev->struct_mutex);

	WARN_ON(!mutex_is_locked(&dev->struct_mutex));



	ret = ironlake_setup_rc6(dev);

	if (ret) {

		mutex_unlock(&dev->struct_mutex);

	if (ret)

		return;

	}



	/*

	 * GPU can automatically power down the render unit if given a page
@@ -2629,7 +2628,6 @@ void ironlake_enable_rc6(struct drm_device *dev) 
	ret = intel_ring_begin(ring, 6);

	if (ret) {

		ironlake_teardown_rc6(dev);

		mutex_unlock(&dev->struct_mutex);

		return;

	}
@@ -2654,13 +2652,11 @@ void ironlake_enable_rc6(struct drm_device *dev) 
	if (ret) {

		DRM_ERROR("failed to enable ironlake power power savings\n");

		ironlake_teardown_rc6(dev);

		mutex_unlock(&dev->struct_mutex);

		return;

	}



	I915_WRITE(PWRCTXA, dev_priv->pwrctx->gtt_offset | PWRCTX_EN);

	I915_WRITE(RSTDBYCTL, I915_READ(RSTDBYCTL) & ~RCX_SW_EXIT);

	mutex_unlock(&dev->struct_mutex);

}



static unsigned long intel_pxfreq(u32 vidfreq)
@@ -3237,8 +3233,6 @@ void intel_disable_gt_powersave(struct drm_device *dev) 


void intel_enable_gt_powersave(struct drm_device *dev)

{

	struct drm_i915_private *dev_priv = dev->dev_private;



	if (IS_IRONLAKE_M(dev)) {

		ironlake_enable_drps(dev);

		ironlake_enable_rc6(dev);
@@ -3246,8 +3240,8 @@ void intel_enable_gt_powersave(struct drm_device *dev) 
	}



	if ((IS_GEN6(dev) || IS_GEN7(dev)) && !IS_VALLEYVIEW(dev)) {

		gen6_enable_rps(dev_priv);

		gen6_update_ring_freq(dev_priv);

		gen6_enable_rps(dev);

		gen6_update_ring_freq(dev);

	}

}