drivers/gpu/drm/radeon/radeon_irq_kms.c

   1 /*
   2  * Copyright 2008 Advanced Micro Devices, Inc.
   3  * Copyright 2008 Red Hat Inc.
   4  * Copyright 2009 Jerome Glisse.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  22  * OTHER DEALINGS IN THE SOFTWARE.
  23  *
  24  * Authors: Dave Airlie
  25  *          Alex Deucher
  26  *          Jerome Glisse
  27  */
  28 #include "drmP.h"
  29 #include "radeon_drm.h"
  30 #include "radeon_reg.h"
  31 #include "radeon.h"
  32 #include "atom.h"
  33
  34 irqreturn_t radeon_driver_irq_handler_kms(DRM_IRQ_ARGS)
  35 {
  36         struct drm_device *dev = (struct drm_device *) arg;
  37         struct radeon_device *rdev = dev->dev_private;
  38
  39         return radeon_irq_process(rdev);
  40 }
  41
  42 /*
  43  * Handle hotplug events outside the interrupt handler proper.
  44  */
  45 static void radeon_hotplug_work_func(struct work_struct *work)
  46 {
  47         struct radeon_device *rdev = container_of(work, struct radeon_device,
  48                                                   hotplug_work);
  49         struct drm_device *dev = rdev->ddev;
  50         struct drm_mode_config *mode_config = &dev->mode_config;
  51         struct drm_connector *connector;
  52
  53         if (mode_config->num_connector) {
  54                 list_for_each_entry(connector, &mode_config->connector_list, head)
  55                         radeon_connector_hotplug(connector);
  56         }
  57         /* Just fire off a uevent and let userspace tell us what to do */
  58         drm_sysfs_hotplug_event(dev);
  59 }
  60
  61 void radeon_driver_irq_preinstall_kms(struct drm_device *dev)
  62 {
  63         struct radeon_device *rdev = dev->dev_private;
  64         unsigned i;
  65
  66         INIT_WORK(&rdev->hotplug_work, radeon_hotplug_work_func);
  67
  68         /* Disable *all* interrupts */
  69         rdev->irq.sw_int = false;
  70         for (i = 0; i < 2; i++) {
  71                 rdev->irq.crtc_vblank_int[i] = false;
  72         }
  73         radeon_irq_set(rdev);
  74         /* Clear bits */
  75         radeon_irq_process(rdev);
  76 }
  77
  78 int radeon_driver_irq_postinstall_kms(struct drm_device *dev)
  79 {
  80         struct radeon_device *rdev = dev->dev_private;
  81
  82         dev->max_vblank_count = 0x001fffff;
  83         rdev->irq.sw_int = true;
  84         radeon_irq_set(rdev);
  85         return 0;
  86 }
  87
  88 void radeon_driver_irq_uninstall_kms(struct drm_device *dev)
  89 {
  90         struct radeon_device *rdev = dev->dev_private;
  91         unsigned i;
  92
  93         if (rdev == NULL) {
  94                 return;
  95         }
  96         /* Disable *all* interrupts */
  97         rdev->irq.sw_int = false;
  98         for (i = 0; i < 2; i++) {
  99                 rdev->irq.crtc_vblank_int[i] = false;
 100                 rdev->irq.hpd[i] = false;
 101         }
 102         radeon_irq_set(rdev);
 103 }
 104
 105 int radeon_irq_kms_init(struct radeon_device *rdev)
 106 {
 107         int r = 0;
 108         int num_crtc = 2;
 109
 110         if (rdev->flags & RADEON_SINGLE_CRTC)
 111                 num_crtc = 1;
 112         spin_lock_init(&rdev->irq.sw_lock);
 113         r = drm_vblank_init(rdev->ddev, num_crtc);
 114         if (r) {
 115                 return r;
 116         }
 117         /* enable msi */
 118         rdev->msi_enabled = 0;
 119         /* MSIs don't seem to work on my rs780;
 120          * not sure about rs880 or other rs780s.
 121          * Needs more investigation.
 122          */
 123         if ((rdev->family >= CHIP_RV380) &&
 124             (rdev->family != CHIP_RS780) &&
 125             (rdev->family != CHIP_RS880)) {
 126                 int ret = pci_enable_msi(rdev->pdev);
 127                 if (!ret) {
 128                         rdev->msi_enabled = 1;
 129                         DRM_INFO("radeon: using MSI.\n");
 130                 }
 131         }
 132         rdev->irq.installed = true;
 133         r = drm_irq_install(rdev->ddev);
 134         if (r) {
 135                 rdev->irq.installed = false;
 136                 return r;
 137         }
 138         DRM_INFO("radeon: irq initialized.\n");
 139         return 0;
 140 }
 141
 142 void radeon_irq_kms_fini(struct radeon_device *rdev)
 143 {
 144         drm_vblank_cleanup(rdev->ddev);
 145         if (rdev->irq.installed) {
 146                 drm_irq_uninstall(rdev->ddev);
 147                 rdev->irq.installed = false;
 148                 if (rdev->msi_enabled)
 149                         pci_disable_msi(rdev->pdev);
 150         }
 151 }
 152
 153 void radeon_irq_kms_sw_irq_get(struct radeon_device *rdev)
 154 {
 155         unsigned long irqflags;
 156
 157         spin_lock_irqsave(&rdev->irq.sw_lock, irqflags);
 158         if (rdev->ddev->irq_enabled && (++rdev->irq.sw_refcount == 1)) {
 159                 rdev->irq.sw_int = true;
 160                 radeon_irq_set(rdev);
 161         }
 162         spin_unlock_irqrestore(&rdev->irq.sw_lock, irqflags);
 163 }
 164
 165 void radeon_irq_kms_sw_irq_put(struct radeon_device *rdev)
 166 {
 167         unsigned long irqflags;
 168
 169         spin_lock_irqsave(&rdev->irq.sw_lock, irqflags);
 170         BUG_ON(rdev->ddev->irq_enabled && rdev->irq.sw_refcount <= 0);
 171         if (rdev->ddev->irq_enabled && (--rdev->irq.sw_refcount == 0)) {
 172                 rdev->irq.sw_int = false;
 173                 radeon_irq_set(rdev);
 174         }
 175         spin_unlock_irqrestore(&rdev->irq.sw_lock, irqflags);
 176 }
 177