Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 47339cd9 authored by Daniel Vetter's avatar Daniel Vetter
Browse files

drm/i915: Extract intel_fifo_underrun.c 



Prep work for some nice documentation. Requires that we export the
display irq enable/disable functions on ilk/ibx. But we already export
them for vlv/i915. So not more inconsistency.

v2: Rebase on top of skl stage 1.

Reviewed-by: default avatarPaulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@intel.com>
parent cacc6c83

drivers/gpu/drm/i915/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -45,6 +45,7 @@ i915-y += intel_renderstate_gen6.o \ 
# modesetting core code

i915-y += intel_bios.o \

	  intel_display.o \

	  intel_fifo_underrun.o \

	  intel_frontbuffer.o \

	  intel_modes.o \

	  intel_overlay.o \

drivers/gpu/drm/i915/i915_drv.h

+11 −0
Original line number Diff line number Diff line
@@ -2312,6 +2312,17 @@ i915_disable_pipestat(struct drm_i915_private *dev_priv, enum pipe pipe, 


void valleyview_enable_display_irqs(struct drm_i915_private *dev_priv);

void valleyview_disable_display_irqs(struct drm_i915_private *dev_priv);

void

ironlake_enable_display_irq(struct drm_i915_private *dev_priv, u32 mask);

void

ironlake_disable_display_irq(struct drm_i915_private *dev_priv, u32 mask);

void ibx_display_interrupt_update(struct drm_i915_private *dev_priv,

				  uint32_t interrupt_mask,

				  uint32_t enabled_irq_mask);

#define ibx_enable_display_interrupt(dev_priv, bits) \

	ibx_display_interrupt_update((dev_priv), (bits), (bits))

#define ibx_disable_display_interrupt(dev_priv, bits) \

	ibx_display_interrupt_update((dev_priv), (bits), 0)



/* i915_gem.c */

int i915_gem_init_ioctl(struct drm_device *dev, void *data,

drivers/gpu/drm/i915/i915_irq.c

+5 −292
Original line number Diff line number Diff line
@@ -139,7 +139,7 @@ static const u32 hpd_status_i915[] = { /* i915 and valleyview are the same */ 
} while (0)



/* For display hotplug interrupt */

static void

void

ironlake_enable_display_irq(struct drm_i915_private *dev_priv, u32 mask)

{

	assert_spin_locked(&dev_priv->irq_lock);
@@ -154,7 +154,7 @@ ironlake_enable_display_irq(struct drm_i915_private *dev_priv, u32 mask) 
	}

}



static void

void

ironlake_disable_display_irq(struct drm_i915_private *dev_priv, u32 mask)

{

	assert_spin_locked(&dev_priv->irq_lock);
@@ -238,24 +238,6 @@ void gen6_disable_pm_irq(struct drm_i915_private *dev_priv, uint32_t mask) 
	snb_update_pm_irq(dev_priv, mask, 0);

}



static bool ivb_can_enable_err_int(struct drm_device *dev)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	struct intel_crtc *crtc;

	enum pipe pipe;



	assert_spin_locked(&dev_priv->irq_lock);



	for_each_pipe(dev_priv, pipe) {

		crtc = to_intel_crtc(dev_priv->pipe_to_crtc_mapping[pipe]);



		if (crtc->cpu_fifo_underrun_disabled)

			return false;

	}



	return true;

}



/**

  * bdw_update_pm_irq - update GT interrupt 2

  * @dev_priv: driver private
@@ -296,128 +278,13 @@ void gen8_disable_pm_irq(struct drm_i915_private *dev_priv, uint32_t mask) 
	bdw_update_pm_irq(dev_priv, mask, 0);

}



static bool cpt_can_enable_serr_int(struct drm_device *dev)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	enum pipe pipe;

	struct intel_crtc *crtc;



	assert_spin_locked(&dev_priv->irq_lock);



	for_each_pipe(dev_priv, pipe) {

		crtc = to_intel_crtc(dev_priv->pipe_to_crtc_mapping[pipe]);



		if (crtc->pch_fifo_underrun_disabled)

			return false;

	}



	return true;

}



void i9xx_check_fifo_underruns(struct drm_device *dev)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	struct intel_crtc *crtc;



	spin_lock_irq(&dev_priv->irq_lock);



	for_each_intel_crtc(dev, crtc) {

		u32 reg = PIPESTAT(crtc->pipe);

		u32 pipestat;



		if (crtc->cpu_fifo_underrun_disabled)

			continue;



		pipestat = I915_READ(reg) & 0xffff0000;

		if ((pipestat & PIPE_FIFO_UNDERRUN_STATUS) == 0)

			continue;



		I915_WRITE(reg, pipestat | PIPE_FIFO_UNDERRUN_STATUS);

		POSTING_READ(reg);



		DRM_ERROR("pipe %c underrun\n", pipe_name(crtc->pipe));

	}



	spin_unlock_irq(&dev_priv->irq_lock);

}



static void i9xx_set_fifo_underrun_reporting(struct drm_device *dev,

					     enum pipe pipe,

					     bool enable, bool old)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	u32 reg = PIPESTAT(pipe);

	u32 pipestat = I915_READ(reg) & 0xffff0000;



	assert_spin_locked(&dev_priv->irq_lock);



	if (enable) {

		I915_WRITE(reg, pipestat | PIPE_FIFO_UNDERRUN_STATUS);

		POSTING_READ(reg);

	} else {

		if (old && pipestat & PIPE_FIFO_UNDERRUN_STATUS)

			DRM_ERROR("pipe %c underrun\n", pipe_name(pipe));

	}

}



static void ironlake_set_fifo_underrun_reporting(struct drm_device *dev,

						 enum pipe pipe, bool enable)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	uint32_t bit = (pipe == PIPE_A) ? DE_PIPEA_FIFO_UNDERRUN :

					  DE_PIPEB_FIFO_UNDERRUN;



	if (enable)

		ironlake_enable_display_irq(dev_priv, bit);

	else

		ironlake_disable_display_irq(dev_priv, bit);

}



static void ivybridge_set_fifo_underrun_reporting(struct drm_device *dev,

						  enum pipe pipe,

						  bool enable, bool old)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	if (enable) {

		I915_WRITE(GEN7_ERR_INT, ERR_INT_FIFO_UNDERRUN(pipe));



		if (!ivb_can_enable_err_int(dev))

			return;



		ironlake_enable_display_irq(dev_priv, DE_ERR_INT_IVB);

	} else {

		ironlake_disable_display_irq(dev_priv, DE_ERR_INT_IVB);



		if (old &&

		    I915_READ(GEN7_ERR_INT) & ERR_INT_FIFO_UNDERRUN(pipe)) {

			DRM_ERROR("uncleared fifo underrun on pipe %c\n",

				  pipe_name(pipe));

		}

	}

}



static void broadwell_set_fifo_underrun_reporting(struct drm_device *dev,

						  enum pipe pipe, bool enable)

{

	struct drm_i915_private *dev_priv = dev->dev_private;



	assert_spin_locked(&dev_priv->irq_lock);



	if (enable)

		dev_priv->de_irq_mask[pipe] &= ~GEN8_PIPE_FIFO_UNDERRUN;

	else

		dev_priv->de_irq_mask[pipe] |= GEN8_PIPE_FIFO_UNDERRUN;

	I915_WRITE(GEN8_DE_PIPE_IMR(pipe), dev_priv->de_irq_mask[pipe]);

	POSTING_READ(GEN8_DE_PIPE_IMR(pipe));

}



/**

 * ibx_display_interrupt_update - update SDEIMR

 * @dev_priv: driver private

 * @interrupt_mask: mask of interrupt bits to update

 * @enabled_irq_mask: mask of interrupt bits to enable

 */

static void ibx_display_interrupt_update(struct drm_i915_private *dev_priv,

void ibx_display_interrupt_update(struct drm_i915_private *dev_priv,

				  uint32_t interrupt_mask,

				  uint32_t enabled_irq_mask)

{
@@ -433,160 +300,6 @@ static void ibx_display_interrupt_update(struct drm_i915_private *dev_priv, 
	I915_WRITE(SDEIMR, sdeimr);

	POSTING_READ(SDEIMR);

}

#define ibx_enable_display_interrupt(dev_priv, bits) \

	ibx_display_interrupt_update((dev_priv), (bits), (bits))

#define ibx_disable_display_interrupt(dev_priv, bits) \

	ibx_display_interrupt_update((dev_priv), (bits), 0)



static void ibx_set_fifo_underrun_reporting(struct drm_device *dev,

					    enum transcoder pch_transcoder,

					    bool enable)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	uint32_t bit = (pch_transcoder == TRANSCODER_A) ?

		       SDE_TRANSA_FIFO_UNDER : SDE_TRANSB_FIFO_UNDER;



	if (enable)

		ibx_enable_display_interrupt(dev_priv, bit);

	else

		ibx_disable_display_interrupt(dev_priv, bit);

}



static void cpt_set_fifo_underrun_reporting(struct drm_device *dev,

					    enum transcoder pch_transcoder,

					    bool enable, bool old)

{

	struct drm_i915_private *dev_priv = dev->dev_private;



	if (enable) {

		I915_WRITE(SERR_INT,

			   SERR_INT_TRANS_FIFO_UNDERRUN(pch_transcoder));



		if (!cpt_can_enable_serr_int(dev))

			return;



		ibx_enable_display_interrupt(dev_priv, SDE_ERROR_CPT);

	} else {

		ibx_disable_display_interrupt(dev_priv, SDE_ERROR_CPT);



		if (old && I915_READ(SERR_INT) &

		    SERR_INT_TRANS_FIFO_UNDERRUN(pch_transcoder)) {

			DRM_ERROR("uncleared pch fifo underrun on pch transcoder %c\n",

				  transcoder_name(pch_transcoder));

		}

	}

}



/**

 * intel_set_cpu_fifo_underrun_reporting - enable/disable FIFO underrun messages

 * @dev: drm device

 * @pipe: pipe

 * @enable: true if we want to report FIFO underrun errors, false otherwise

 *

 * This function makes us disable or enable CPU fifo underruns for a specific

 * pipe. Notice that on some Gens (e.g. IVB, HSW), disabling FIFO underrun

 * reporting for one pipe may also disable all the other CPU error interruts for

 * the other pipes, due to the fact that there's just one interrupt mask/enable

 * bit for all the pipes.

 *

 * Returns the previous state of underrun reporting.

 */

static bool __intel_set_cpu_fifo_underrun_reporting(struct drm_device *dev,

						    enum pipe pipe, bool enable)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	struct drm_crtc *crtc = dev_priv->pipe_to_crtc_mapping[pipe];

	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);

	bool old;



	assert_spin_locked(&dev_priv->irq_lock);



	old = !intel_crtc->cpu_fifo_underrun_disabled;

	intel_crtc->cpu_fifo_underrun_disabled = !enable;



	if (HAS_GMCH_DISPLAY(dev))

		i9xx_set_fifo_underrun_reporting(dev, pipe, enable, old);

	else if (IS_GEN5(dev) || IS_GEN6(dev))

		ironlake_set_fifo_underrun_reporting(dev, pipe, enable);

	else if (IS_GEN7(dev))

		ivybridge_set_fifo_underrun_reporting(dev, pipe, enable, old);

	else if (IS_GEN8(dev) || IS_GEN9(dev))

		broadwell_set_fifo_underrun_reporting(dev, pipe, enable);



	return old;

}



bool intel_set_cpu_fifo_underrun_reporting(struct drm_device *dev,

					   enum pipe pipe, bool enable)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	unsigned long flags;

	bool ret;



	spin_lock_irqsave(&dev_priv->irq_lock, flags);

	ret = __intel_set_cpu_fifo_underrun_reporting(dev, pipe, enable);

	spin_unlock_irqrestore(&dev_priv->irq_lock, flags);



	return ret;

}



static bool __cpu_fifo_underrun_reporting_enabled(struct drm_device *dev,

						  enum pipe pipe)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	struct drm_crtc *crtc = dev_priv->pipe_to_crtc_mapping[pipe];

	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);



	return !intel_crtc->cpu_fifo_underrun_disabled;

}



/**

 * intel_set_pch_fifo_underrun_reporting - enable/disable FIFO underrun messages

 * @dev: drm device

 * @pch_transcoder: the PCH transcoder (same as pipe on IVB and older)

 * @enable: true if we want to report FIFO underrun errors, false otherwise

 *

 * This function makes us disable or enable PCH fifo underruns for a specific

 * PCH transcoder. Notice that on some PCHs (e.g. CPT/PPT), disabling FIFO

 * underrun reporting for one transcoder may also disable all the other PCH

 * error interruts for the other transcoders, due to the fact that there's just

 * one interrupt mask/enable bit for all the transcoders.

 *

 * Returns the previous state of underrun reporting.

 */

bool intel_set_pch_fifo_underrun_reporting(struct drm_device *dev,

					   enum transcoder pch_transcoder,

					   bool enable)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	struct drm_crtc *crtc = dev_priv->pipe_to_crtc_mapping[pch_transcoder];

	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);

	unsigned long flags;

	bool old;



	/*

	 * NOTE: Pre-LPT has a fixed cpu pipe -> pch transcoder mapping, but LPT

	 * has only one pch transcoder A that all pipes can use. To avoid racy

	 * pch transcoder -> pipe lookups from interrupt code simply store the

	 * underrun statistics in crtc A. Since we never expose this anywhere

	 * nor use it outside of the fifo underrun code here using the "wrong"

	 * crtc on LPT won't cause issues.

	 */



	spin_lock_irqsave(&dev_priv->irq_lock, flags);



	old = !intel_crtc->pch_fifo_underrun_disabled;

	intel_crtc->pch_fifo_underrun_disabled = !enable;



	if (HAS_PCH_IBX(dev))

		ibx_set_fifo_underrun_reporting(dev, pch_transcoder, enable);

	else

		cpt_set_fifo_underrun_reporting(dev, pch_transcoder, enable, old);



	spin_unlock_irqrestore(&dev_priv->irq_lock, flags);

	return old;

}





static void

__i915_enable_pipestat(struct drm_i915_private *dev_priv, enum pipe pipe,

drivers/gpu/drm/i915/intel_drv.h

+6 −2
Original line number Diff line number Diff line
@@ -755,12 +755,17 @@ static inline unsigned int intel_num_planes(struct intel_crtc *crtc) 
	return INTEL_INFO(crtc->base.dev)->num_sprites[crtc->pipe] + 1;

}



/* i915_irq.c */

/* intel_fifo_underrun.c */

bool intel_set_cpu_fifo_underrun_reporting(struct drm_device *dev,

					   enum pipe pipe, bool enable);

bool intel_set_pch_fifo_underrun_reporting(struct drm_device *dev,

					   enum transcoder pch_transcoder,

					   bool enable);

void i9xx_check_fifo_underruns(struct drm_device *dev);

bool __cpu_fifo_underrun_reporting_enabled(struct drm_device *dev,

					   enum pipe pipe);



/* i915_irq.c */

void gen5_enable_gt_irq(struct drm_i915_private *dev_priv, uint32_t mask);

void gen5_disable_gt_irq(struct drm_i915_private *dev_priv, uint32_t mask);

void gen6_enable_pm_irq(struct drm_i915_private *dev_priv, uint32_t mask);
@@ -779,7 +784,6 @@ static inline bool intel_irqs_enabled(struct drm_i915_private *dev_priv) 
}



int intel_get_crtc_scanline(struct intel_crtc *crtc);

void i9xx_check_fifo_underruns(struct drm_device *dev);

void gen8_irq_power_well_post_enable(struct drm_i915_private *dev_priv);



/* intel_crt.c */

drivers/gpu/drm/i915/intel_fifo_underrun.c

0 → 100644
+311 −0
Original line number Diff line number Diff line 
/*

 * Copyright © 2014 Intel Corporation

 *

 * Permission is hereby granted, free of charge, to any person obtaining a

 * copy of this software and associated documentation files (the "Software"),

 * to deal in the Software without restriction, including without limitation

 * the rights to use, copy, modify, merge, publish, distribute, sublicense,

 * and/or sell copies of the Software, and to permit persons to whom the

 * Software is furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice (including the next

 * paragraph) shall be included in all copies or substantial portions of the

 * Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL

 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING

 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS

 * IN THE SOFTWARE.

 *

 * Authors:

 *    Daniel Vetter <daniel.vetter@ffwll.ch>

 *

 */



#include "i915_drv.h"

#include "intel_drv.h"



static bool ivb_can_enable_err_int(struct drm_device *dev)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	struct intel_crtc *crtc;

	enum pipe pipe;



	assert_spin_locked(&dev_priv->irq_lock);



	for_each_pipe(dev_priv, pipe) {

		crtc = to_intel_crtc(dev_priv->pipe_to_crtc_mapping[pipe]);



		if (crtc->cpu_fifo_underrun_disabled)

			return false;

	}



	return true;

}



static bool cpt_can_enable_serr_int(struct drm_device *dev)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	enum pipe pipe;

	struct intel_crtc *crtc;



	assert_spin_locked(&dev_priv->irq_lock);



	for_each_pipe(dev_priv, pipe) {

		crtc = to_intel_crtc(dev_priv->pipe_to_crtc_mapping[pipe]);



		if (crtc->pch_fifo_underrun_disabled)

			return false;

	}



	return true;

}



void i9xx_check_fifo_underruns(struct drm_device *dev)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	struct intel_crtc *crtc;



	spin_lock_irq(&dev_priv->irq_lock);



	for_each_intel_crtc(dev, crtc) {

		u32 reg = PIPESTAT(crtc->pipe);

		u32 pipestat;



		if (crtc->cpu_fifo_underrun_disabled)

			continue;



		pipestat = I915_READ(reg) & 0xffff0000;

		if ((pipestat & PIPE_FIFO_UNDERRUN_STATUS) == 0)

			continue;



		I915_WRITE(reg, pipestat | PIPE_FIFO_UNDERRUN_STATUS);

		POSTING_READ(reg);



		DRM_ERROR("pipe %c underrun\n", pipe_name(crtc->pipe));

	}



	spin_unlock_irq(&dev_priv->irq_lock);

}



static void i9xx_set_fifo_underrun_reporting(struct drm_device *dev,

					     enum pipe pipe,

					     bool enable, bool old)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	u32 reg = PIPESTAT(pipe);

	u32 pipestat = I915_READ(reg) & 0xffff0000;



	assert_spin_locked(&dev_priv->irq_lock);



	if (enable) {

		I915_WRITE(reg, pipestat | PIPE_FIFO_UNDERRUN_STATUS);

		POSTING_READ(reg);

	} else {

		if (old && pipestat & PIPE_FIFO_UNDERRUN_STATUS)

			DRM_ERROR("pipe %c underrun\n", pipe_name(pipe));

	}

}



static void ironlake_set_fifo_underrun_reporting(struct drm_device *dev,

						 enum pipe pipe, bool enable)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	uint32_t bit = (pipe == PIPE_A) ? DE_PIPEA_FIFO_UNDERRUN :

					  DE_PIPEB_FIFO_UNDERRUN;



	if (enable)

		ironlake_enable_display_irq(dev_priv, bit);

	else

		ironlake_disable_display_irq(dev_priv, bit);

}



static void ivybridge_set_fifo_underrun_reporting(struct drm_device *dev,

						  enum pipe pipe,

						  bool enable, bool old)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	if (enable) {

		I915_WRITE(GEN7_ERR_INT, ERR_INT_FIFO_UNDERRUN(pipe));



		if (!ivb_can_enable_err_int(dev))

			return;



		ironlake_enable_display_irq(dev_priv, DE_ERR_INT_IVB);

	} else {

		ironlake_disable_display_irq(dev_priv, DE_ERR_INT_IVB);



		if (old &&

		    I915_READ(GEN7_ERR_INT) & ERR_INT_FIFO_UNDERRUN(pipe)) {

			DRM_ERROR("uncleared fifo underrun on pipe %c\n",

				  pipe_name(pipe));

		}

	}

}



static void broadwell_set_fifo_underrun_reporting(struct drm_device *dev,

						  enum pipe pipe, bool enable)

{

	struct drm_i915_private *dev_priv = dev->dev_private;



	assert_spin_locked(&dev_priv->irq_lock);



	if (enable)

		dev_priv->de_irq_mask[pipe] &= ~GEN8_PIPE_FIFO_UNDERRUN;

	else

		dev_priv->de_irq_mask[pipe] |= GEN8_PIPE_FIFO_UNDERRUN;

	I915_WRITE(GEN8_DE_PIPE_IMR(pipe), dev_priv->de_irq_mask[pipe]);

	POSTING_READ(GEN8_DE_PIPE_IMR(pipe));

}



static void ibx_set_fifo_underrun_reporting(struct drm_device *dev,

					    enum transcoder pch_transcoder,

					    bool enable)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	uint32_t bit = (pch_transcoder == TRANSCODER_A) ?

		       SDE_TRANSA_FIFO_UNDER : SDE_TRANSB_FIFO_UNDER;



	if (enable)

		ibx_enable_display_interrupt(dev_priv, bit);

	else

		ibx_disable_display_interrupt(dev_priv, bit);

}



static void cpt_set_fifo_underrun_reporting(struct drm_device *dev,

					    enum transcoder pch_transcoder,

					    bool enable, bool old)

{

	struct drm_i915_private *dev_priv = dev->dev_private;



	if (enable) {

		I915_WRITE(SERR_INT,

			   SERR_INT_TRANS_FIFO_UNDERRUN(pch_transcoder));



		if (!cpt_can_enable_serr_int(dev))

			return;



		ibx_enable_display_interrupt(dev_priv, SDE_ERROR_CPT);

	} else {

		ibx_disable_display_interrupt(dev_priv, SDE_ERROR_CPT);



		if (old && I915_READ(SERR_INT) &

		    SERR_INT_TRANS_FIFO_UNDERRUN(pch_transcoder)) {

			DRM_ERROR("uncleared pch fifo underrun on pch transcoder %c\n",

				  transcoder_name(pch_transcoder));

		}

	}

}



/**

 * intel_set_cpu_fifo_underrun_reporting - enable/disable FIFO underrun messages

 * @dev: drm device

 * @pipe: pipe

 * @enable: true if we want to report FIFO underrun errors, false otherwise

 *

 * This function makes us disable or enable CPU fifo underruns for a specific

 * pipe. Notice that on some Gens (e.g. IVB, HSW), disabling FIFO underrun

 * reporting for one pipe may also disable all the other CPU error interruts for

 * the other pipes, due to the fact that there's just one interrupt mask/enable

 * bit for all the pipes.

 *

 * Returns the previous state of underrun reporting.

 */

static bool __intel_set_cpu_fifo_underrun_reporting(struct drm_device *dev,

						    enum pipe pipe, bool enable)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	struct drm_crtc *crtc = dev_priv->pipe_to_crtc_mapping[pipe];

	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);

	bool old;



	assert_spin_locked(&dev_priv->irq_lock);



	old = !intel_crtc->cpu_fifo_underrun_disabled;

	intel_crtc->cpu_fifo_underrun_disabled = !enable;



	if (HAS_GMCH_DISPLAY(dev))

		i9xx_set_fifo_underrun_reporting(dev, pipe, enable, old);

	else if (IS_GEN5(dev) || IS_GEN6(dev))

		ironlake_set_fifo_underrun_reporting(dev, pipe, enable);

	else if (IS_GEN7(dev))

		ivybridge_set_fifo_underrun_reporting(dev, pipe, enable, old);

	else if (IS_GEN8(dev) || IS_GEN9(dev))

		broadwell_set_fifo_underrun_reporting(dev, pipe, enable);



	return old;

}



bool intel_set_cpu_fifo_underrun_reporting(struct drm_device *dev,

					   enum pipe pipe, bool enable)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	unsigned long flags;

	bool ret;



	spin_lock_irqsave(&dev_priv->irq_lock, flags);

	ret = __intel_set_cpu_fifo_underrun_reporting(dev, pipe, enable);

	spin_unlock_irqrestore(&dev_priv->irq_lock, flags);



	return ret;

}



bool __cpu_fifo_underrun_reporting_enabled(struct drm_device *dev,

					   enum pipe pipe)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	struct drm_crtc *crtc = dev_priv->pipe_to_crtc_mapping[pipe];

	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);



	return !intel_crtc->cpu_fifo_underrun_disabled;

}



/**

 * intel_set_pch_fifo_underrun_reporting - enable/disable FIFO underrun messages

 * @dev: drm device

 * @pch_transcoder: the PCH transcoder (same as pipe on IVB and older)

 * @enable: true if we want to report FIFO underrun errors, false otherwise

 *

 * This function makes us disable or enable PCH fifo underruns for a specific

 * PCH transcoder. Notice that on some PCHs (e.g. CPT/PPT), disabling FIFO

 * underrun reporting for one transcoder may also disable all the other PCH

 * error interruts for the other transcoders, due to the fact that there's just

 * one interrupt mask/enable bit for all the transcoders.

 *

 * Returns the previous state of underrun reporting.

 */

bool intel_set_pch_fifo_underrun_reporting(struct drm_device *dev,

					   enum transcoder pch_transcoder,

					   bool enable)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	struct drm_crtc *crtc = dev_priv->pipe_to_crtc_mapping[pch_transcoder];

	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);

	unsigned long flags;

	bool old;



	/*

	 * NOTE: Pre-LPT has a fixed cpu pipe -> pch transcoder mapping, but LPT

	 * has only one pch transcoder A that all pipes can use. To avoid racy

	 * pch transcoder -> pipe lookups from interrupt code simply store the

	 * underrun statistics in crtc A. Since we never expose this anywhere

	 * nor use it outside of the fifo underrun code here using the "wrong"

	 * crtc on LPT won't cause issues.

	 */



	spin_lock_irqsave(&dev_priv->irq_lock, flags);



	old = !intel_crtc->pch_fifo_underrun_disabled;

	intel_crtc->pch_fifo_underrun_disabled = !enable;



	if (HAS_PCH_IBX(dev))

		ibx_set_fifo_underrun_reporting(dev, pch_transcoder, enable);

	else

		cpt_set_fifo_underrun_reporting(dev, pch_transcoder, enable, old);



	spin_unlock_irqrestore(&dev_priv->irq_lock, flags);

	return old;

}