text: /*
   * Copyright (C) 2013 Red Hat
   * Author: Rob Clark <robdclark@gmail.com>
   *
   * This program is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 as published by
   * the Free Software Foundation.
   *
   * This program is distributed in the hope that it will be useful, but WITHOUT
   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
   * more details.
   *
   * You should have received a copy of the GNU General Public License along with
   * this program.  If not, see <http://www.gnu.org/licenses/>.
   */
  
  #include <drm/drm_print.h>
  
  #include "msm_drv.h"
  #include "mdp4_kms.h"
  
  void mdp4_set_irqmask(struct mdp_kms *mdp_kms, uint32_t irqmask,
  		uint32_t old_irqmask)
  {
  	mdp4_write(to_mdp4_kms(mdp_kms), REG_MDP4_INTR_CLEAR,
  		irqmask ^ (irqmask & old_irqmask));
  	mdp4_write(to_mdp4_kms(mdp_kms), REG_MDP4_INTR_ENABLE, irqmask);
  }
  
  static void mdp4_irq_error_handler(struct mdp_irq *irq, uint32_t irqstatus)
  {
  	struct mdp4_kms *mdp4_kms = container_of(irq, struct mdp4_kms, error_handler);
  	static DEFINE_RATELIMIT_STATE(rs, 5*HZ, 1);
  	extern bool dumpstate;
  
  	DRM_ERROR_RATELIMITED("errors: %08x\n", irqstatus);
  
  	if (dumpstate && __ratelimit(&rs)) {
  		struct drm_printer p = drm_info_printer(mdp4_kms->dev->dev);
  		drm_state_dump(mdp4_kms->dev, &p);
  	}
  }
  
  void mdp4_irq_preinstall(struct msm_kms *kms)
  {
  	struct mdp4_kms *mdp4_kms = to_mdp4_kms(to_mdp_kms(kms));
  	mdp4_enable(mdp4_kms);
  	mdp4_write(mdp4_kms, REG_MDP4_INTR_CLEAR, 0xffffffff);
  	mdp4_write(mdp4_kms, REG_MDP4_INTR_ENABLE, 0x00000000);
  	mdp4_disable(mdp4_kms);
  }
  
  int mdp4_irq_postinstall(struct msm_kms *kms)
  {
  	struct mdp_kms *mdp_kms = to_mdp_kms(kms);
  	struct mdp4_kms *mdp4_kms = to_mdp4_kms(mdp_kms);
  	struct mdp_irq *error_handler = &mdp4_kms->error_handler;
  
  	error_handler->irq = mdp4_irq_error_handler;
  	error_handler->irqmask = MDP4_IRQ_PRIMARY_INTF_UDERRUN |
  			MDP4_IRQ_EXTERNAL_INTF_UDERRUN;
  
  	mdp_irq_register(mdp_kms, error_handler);
  
  	return 0;
  }
  
  void mdp4_irq_uninstall(struct msm_kms *kms)
  {
  	struct mdp4_kms *mdp4_kms = to_mdp4_kms(to_mdp_kms(kms));
  	mdp4_enable(mdp4_kms);
  	mdp4_write(mdp4_kms, REG_MDP4_INTR_ENABLE, 0x00000000);
  	mdp4_disable(mdp4_kms);
  }
  
  irqreturn_t mdp4_irq(struct msm_kms *kms)
  {
  	struct mdp_kms *mdp_kms = to_mdp_kms(kms);
  	struct mdp4_kms *mdp4_kms = to_mdp4_kms(mdp_kms);
  	struct drm_device *dev = mdp4_kms->dev;
  	struct msm_drm_private *priv = dev->dev_private;
  	unsigned int id;
  	uint32_t status, enable;
  
  	enable = mdp4_read(mdp4_kms, REG_MDP4_INTR_ENABLE);
  	status = mdp4_read(mdp4_kms, REG_MDP4_INTR_STATUS) & enable;
  	mdp4_write(mdp4_kms, REG_MDP4_INTR_CLEAR, status);
  
  	VERB("status=%08x", status);
  
  	mdp_dispatch_irqs(mdp_kms, status);
  
  	for (id = 0; id < priv->num_crtcs; id++)
  		if (status & mdp4_crtc_vblank(priv->crtcs[id]))
  			drm_handle_vblank(dev, id);
  
  	return IRQ_HANDLED;
  }
  
  int mdp4_enable_vblank(struct msm_kms *kms, struct drm_crtc *crtc)
  {
  	struct mdp4_kms *mdp4_kms = to_mdp4_kms(to_mdp_kms(kms));
  
  	mdp4_enable(mdp4_kms);
  	mdp_update_vblank_mask(to_mdp_kms(kms),
  			mdp4_crtc_vblank(crtc), true);
  	mdp4_disable(mdp4_kms);
  
  	return 0;
  }
  
  void mdp4_disable_vblank(struct msm_kms *kms, struct drm_crtc *crtc)
  {
  	struct mdp4_kms *mdp4_kms = to_mdp4_kms(to_mdp_kms(kms));
  
  	mdp4_enable(mdp4_kms);
  	mdp_update_vblank_mask(to_mdp_kms(kms),
  			mdp4_crtc_vblank(crtc), false);
  	mdp4_disable(mdp4_kms);
  }
  