include/drm/drm_irq.h

   1 /*
   2  * Copyright 2016 Intel Corp.
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  19  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  20  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  21  * OTHER DEALINGS IN THE SOFTWARE.
  22  */
  23
  24 #ifndef _DRM_IRQ_H_
  25 #define _DRM_IRQ_H_
  26
  27 #include <linux/seqlock.h>
  28
  29 /**
  30  * struct drm_pending_vblank_event - pending vblank event tracking
  31  */
  32 struct drm_pending_vblank_event {
  33         /**
  34          * @base: Base structure for tracking pending DRM events.
  35          */
  36         struct drm_pending_event base;
  37         /**
  38          * @pipe: drm_crtc_index() of the &drm_crtc this event is for.
  39          */
  40         unsigned int pipe;
  41         /**
  42          * @event: Actual event which will be sent to userspace.
  43          */
  44         struct drm_event_vblank event;
  45 };
  46
  47 /**
  48  * struct drm_vblank_crtc - vblank tracking for a CRTC
  49  *
  50  * This structure tracks the vblank state for one CRTC.
  51  *
  52  * Note that for historical reasons - the vblank handling code is still shared
  53  * with legacy/non-kms drivers - this is a free-standing structure not directly
  54  * connected to struct &drm_crtc. But all public interface functions are taking
  55  * a struct &drm_crtc to hide this implementation detail.
  56  */
  57 struct drm_vblank_crtc {
  58         /**
  59          * @dev: Pointer to the &drm_device.
  60          */
  61         struct drm_device *dev;
  62         /**
  63          * @queue: Wait queue for vblank waiters.
  64          */
  65         wait_queue_head_t queue;        /**< VBLANK wait queue */
  66         /**
  67          * @disable_timer: Disable timer for the delayed vblank disabling
  68          * hysteresis logic. Vblank disabling is controlled through the
  69          * drm_vblank_offdelay module option and the setting of the
  70          * max_vblank_count value in the &drm_device structure.
  71          */
  72         struct timer_list disable_timer;
  73
  74         /**
  75          * @seqlock: Protect vblank count and time.
  76          */
  77         seqlock_t seqlock;              /* protects vblank count and time */
  78
  79         /**
  80          * @count: Current software vblank counter.
  81          */
  82         u32 count;
  83         /**
  84          * @time: Vblank timestamp corresponding to @count.
  85          */
  86         struct timeval time;
  87
  88         /**
  89          * @refcount: Number of users/waiters of the vblank interrupt. Only when
  90          * this refcount reaches 0 can the hardware interrupt be disabled using
  91          * @disable_timer.
  92          */
  93         atomic_t refcount;              /* number of users of vblank interruptsper crtc */
  94         /**
  95          * @last: Protected by dev->vbl_lock, used for wraparound handling.
  96          */
  97         u32 last;
  98         /**
  99          * @inmodeset: Tracks whether the vblank is disabled due to a modeset.
 100          * For legacy driver bit 2 additionally tracks whether an additional
 101          * temporary vblank reference has been acquired to paper over the
 102          * hardware counter resetting/jumping. KMS drivers should instead just
 103          * call drm_crtc_vblank_off() and drm_crtc_vblank_on(), which explicitly
 104          * save and restore the vblank count.
 105          */
 106         unsigned int inmodeset;         /* Display driver is setting mode */
 107         /**
 108          * @pipe: drm_crtc_index() of the &drm_crtc corresponding to this
 109          * structure.
 110          */
 111         unsigned int pipe;
 112         /**
 113          * @framedur_ns: Frame/Field duration in ns, used by
 114          * drm_calc_vbltimestamp_from_scanoutpos() and computed by
 115          * drm_calc_timestamping_constants().
 116          */
 117         int framedur_ns;
 118         /**
 119          * @linedur_ns: Line duration in ns, used by
 120          * drm_calc_vbltimestamp_from_scanoutpos() and computed by
 121          * drm_calc_timestamping_constants().
 122          */
 123         int linedur_ns;
 124         /**
 125          * @enabled: Tracks the enabling state of the corresponding &drm_crtc to
 126          * avoid double-disabling and hence corrupting saved state. Needed by
 127          * drivers not using atomic KMS, since those might go through their CRTC
 128          * disabling functions multiple times.
 129          */
 130         bool enabled;
 131 };
 132
 133 int drm_irq_install(struct drm_device *dev, int irq);
 134 int drm_irq_uninstall(struct drm_device *dev);
 135
 136 int drm_vblank_init(struct drm_device *dev, unsigned int num_crtcs);
 137 u32 drm_crtc_vblank_count(struct drm_crtc *crtc);
 138 u32 drm_crtc_vblank_count_and_time(struct drm_crtc *crtc,
 139                                    struct timeval *vblanktime);
 140 void drm_crtc_send_vblank_event(struct drm_crtc *crtc,
 141                                struct drm_pending_vblank_event *e);
 142 void drm_crtc_arm_vblank_event(struct drm_crtc *crtc,
 143                               struct drm_pending_vblank_event *e);
 144 bool drm_handle_vblank(struct drm_device *dev, unsigned int pipe);
 145 bool drm_crtc_handle_vblank(struct drm_crtc *crtc);
 146 int drm_crtc_vblank_get(struct drm_crtc *crtc);
 147 void drm_crtc_vblank_put(struct drm_crtc *crtc);
 148 void drm_wait_one_vblank(struct drm_device *dev, unsigned int pipe);
 149 void drm_crtc_wait_one_vblank(struct drm_crtc *crtc);
 150 void drm_crtc_vblank_off(struct drm_crtc *crtc);
 151 void drm_crtc_vblank_reset(struct drm_crtc *crtc);
 152 void drm_crtc_vblank_on(struct drm_crtc *crtc);
 153 void drm_vblank_cleanup(struct drm_device *dev);
 154 u32 drm_accurate_vblank_count(struct drm_crtc *crtc);
 155 u32 drm_vblank_no_hw_counter(struct drm_device *dev, unsigned int pipe);
 156
 157 int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
 158                                           unsigned int pipe, int *max_error,
 159                                           struct timeval *vblank_time,
 160                                           unsigned flags,
 161                                           const struct drm_display_mode *mode);
 162 void drm_calc_timestamping_constants(struct drm_crtc *crtc,
 163                                      const struct drm_display_mode *mode);
 164
 165 /**
 166  * drm_crtc_vblank_waitqueue - get vblank waitqueue for the CRTC
 167  * @crtc: which CRTC's vblank waitqueue to retrieve
 168  *
 169  * This function returns a pointer to the vblank waitqueue for the CRTC.
 170  * Drivers can use this to implement vblank waits using wait_event() and related
 171  * functions.
 172  */
 173 static inline wait_queue_head_t *drm_crtc_vblank_waitqueue(struct drm_crtc *crtc)
 174 {
 175         return &crtc->dev->vblank[drm_crtc_index(crtc)].queue;
 176 }
 177
 178 #endif