mdp4_irq.c 4.9 KB

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  1. /*
  2. * Copyright (C) 2013 Red Hat
  3. * Author: Rob Clark <robdclark@gmail.com>
  4. *
  5. * This program is free software; you can redistribute it and/or modify it
  6. * under the terms of the GNU General Public License version 2 as published by
  7. * the Free Software Foundation.
  8. *
  9. * This program is distributed in the hope that it will be useful, but WITHOUT
  10. * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11. * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
  12. * more details.
  13. *
  14. * You should have received a copy of the GNU General Public License along with
  15. * this program. If not, see <http://www.gnu.org/licenses/>.
  16. */
  17. #include "msm_drv.h"
  18. #include "mdp4_kms.h"
  19. struct mdp4_irq_wait {
  20. struct mdp4_irq irq;
  21. int count;
  22. };
  23. static DECLARE_WAIT_QUEUE_HEAD(wait_event);
  24. static DEFINE_SPINLOCK(list_lock);
  25. static void update_irq(struct mdp4_kms *mdp4_kms)
  26. {
  27. struct mdp4_irq *irq;
  28. uint32_t irqmask = mdp4_kms->vblank_mask;
  29. BUG_ON(!spin_is_locked(&list_lock));
  30. list_for_each_entry(irq, &mdp4_kms->irq_list, node)
  31. irqmask |= irq->irqmask;
  32. mdp4_write(mdp4_kms, REG_MDP4_INTR_ENABLE, irqmask);
  33. }
  34. static void update_irq_unlocked(struct mdp4_kms *mdp4_kms)
  35. {
  36. unsigned long flags;
  37. spin_lock_irqsave(&list_lock, flags);
  38. update_irq(mdp4_kms);
  39. spin_unlock_irqrestore(&list_lock, flags);
  40. }
  41. static void mdp4_irq_error_handler(struct mdp4_irq *irq, uint32_t irqstatus)
  42. {
  43. DRM_ERROR("errors: %08x\n", irqstatus);
  44. }
  45. void mdp4_irq_preinstall(struct msm_kms *kms)
  46. {
  47. struct mdp4_kms *mdp4_kms = to_mdp4_kms(kms);
  48. mdp4_write(mdp4_kms, REG_MDP4_INTR_CLEAR, 0xffffffff);
  49. }
  50. int mdp4_irq_postinstall(struct msm_kms *kms)
  51. {
  52. struct mdp4_kms *mdp4_kms = to_mdp4_kms(kms);
  53. struct mdp4_irq *error_handler = &mdp4_kms->error_handler;
  54. INIT_LIST_HEAD(&mdp4_kms->irq_list);
  55. error_handler->irq = mdp4_irq_error_handler;
  56. error_handler->irqmask = MDP4_IRQ_PRIMARY_INTF_UDERRUN |
  57. MDP4_IRQ_EXTERNAL_INTF_UDERRUN;
  58. mdp4_irq_register(mdp4_kms, error_handler);
  59. return 0;
  60. }
  61. void mdp4_irq_uninstall(struct msm_kms *kms)
  62. {
  63. struct mdp4_kms *mdp4_kms = to_mdp4_kms(kms);
  64. mdp4_write(mdp4_kms, REG_MDP4_INTR_ENABLE, 0x00000000);
  65. }
  66. irqreturn_t mdp4_irq(struct msm_kms *kms)
  67. {
  68. struct mdp4_kms *mdp4_kms = to_mdp4_kms(kms);
  69. struct drm_device *dev = mdp4_kms->dev;
  70. struct msm_drm_private *priv = dev->dev_private;
  71. struct mdp4_irq *handler, *n;
  72. unsigned long flags;
  73. unsigned int id;
  74. uint32_t status;
  75. status = mdp4_read(mdp4_kms, REG_MDP4_INTR_STATUS);
  76. mdp4_write(mdp4_kms, REG_MDP4_INTR_CLEAR, status);
  77. VERB("status=%08x", status);
  78. for (id = 0; id < priv->num_crtcs; id++)
  79. if (status & mdp4_crtc_vblank(priv->crtcs[id]))
  80. drm_handle_vblank(dev, id);
  81. spin_lock_irqsave(&list_lock, flags);
  82. mdp4_kms->in_irq = true;
  83. list_for_each_entry_safe(handler, n, &mdp4_kms->irq_list, node) {
  84. if (handler->irqmask & status) {
  85. spin_unlock_irqrestore(&list_lock, flags);
  86. handler->irq(handler, handler->irqmask & status);
  87. spin_lock_irqsave(&list_lock, flags);
  88. }
  89. }
  90. mdp4_kms->in_irq = false;
  91. update_irq(mdp4_kms);
  92. spin_unlock_irqrestore(&list_lock, flags);
  93. return IRQ_HANDLED;
  94. }
  95. int mdp4_enable_vblank(struct msm_kms *kms, struct drm_crtc *crtc)
  96. {
  97. struct mdp4_kms *mdp4_kms = to_mdp4_kms(kms);
  98. unsigned long flags;
  99. spin_lock_irqsave(&list_lock, flags);
  100. mdp4_kms->vblank_mask |= mdp4_crtc_vblank(crtc);
  101. update_irq(mdp4_kms);
  102. spin_unlock_irqrestore(&list_lock, flags);
  103. return 0;
  104. }
  105. void mdp4_disable_vblank(struct msm_kms *kms, struct drm_crtc *crtc)
  106. {
  107. struct mdp4_kms *mdp4_kms = to_mdp4_kms(kms);
  108. unsigned long flags;
  109. spin_lock_irqsave(&list_lock, flags);
  110. mdp4_kms->vblank_mask &= ~mdp4_crtc_vblank(crtc);
  111. update_irq(mdp4_kms);
  112. spin_unlock_irqrestore(&list_lock, flags);
  113. }
  114. static void wait_irq(struct mdp4_irq *irq, uint32_t irqstatus)
  115. {
  116. struct mdp4_irq_wait *wait =
  117. container_of(irq, struct mdp4_irq_wait, irq);
  118. wait->count--;
  119. wake_up_all(&wait_event);
  120. }
  121. void mdp4_irq_wait(struct mdp4_kms *mdp4_kms, uint32_t irqmask)
  122. {
  123. struct mdp4_irq_wait wait = {
  124. .irq = {
  125. .irq = wait_irq,
  126. .irqmask = irqmask,
  127. },
  128. .count = 1,
  129. };
  130. mdp4_irq_register(mdp4_kms, &wait.irq);
  131. wait_event(wait_event, (wait.count <= 0));
  132. mdp4_irq_unregister(mdp4_kms, &wait.irq);
  133. }
  134. void mdp4_irq_register(struct mdp4_kms *mdp4_kms, struct mdp4_irq *irq)
  135. {
  136. unsigned long flags;
  137. bool needs_update = false;
  138. spin_lock_irqsave(&list_lock, flags);
  139. if (!irq->registered) {
  140. irq->registered = true;
  141. list_add(&irq->node, &mdp4_kms->irq_list);
  142. needs_update = !mdp4_kms->in_irq;
  143. }
  144. spin_unlock_irqrestore(&list_lock, flags);
  145. if (needs_update)
  146. update_irq_unlocked(mdp4_kms);
  147. }
  148. void mdp4_irq_unregister(struct mdp4_kms *mdp4_kms, struct mdp4_irq *irq)
  149. {
  150. unsigned long flags;
  151. bool needs_update = false;
  152. spin_lock_irqsave(&list_lock, flags);
  153. if (irq->registered) {
  154. irq->registered = false;
  155. list_del(&irq->node);
  156. needs_update = !mdp4_kms->in_irq;
  157. }
  158. spin_unlock_irqrestore(&list_lock, flags);
  159. if (needs_update)
  160. update_irq_unlocked(mdp4_kms);
  161. }