drivers/gpu/drm/msm/msm_kms.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright (c) 2016-2018, The Linux Foundation. All rights reserved.
   4  * Copyright (C) 2013 Red Hat
   5  * Author: Rob Clark <robdclark@gmail.com>
   6  */
   7
   8 #ifndef __MSM_KMS_H__
   9 #define __MSM_KMS_H__
  10
  11 #include <linux/clk.h>
  12 #include <linux/regulator/consumer.h>
  13
  14 #include "msm_drv.h"
  15
  16 #define MAX_PLANE       4
  17
  18 /* As there are different display controller blocks depending on the
  19  * snapdragon version, the kms support is split out and the appropriate
  20  * implementation is loaded at runtime.  The kms module is responsible
  21  * for constructing the appropriate planes/crtcs/encoders/connectors.
  22  */
  23 struct msm_kms_funcs {
  24         /* hw initialization: */
  25         int (*hw_init)(struct msm_kms *kms);
  26         /* irq handling: */
  27         void (*irq_preinstall)(struct msm_kms *kms);
  28         int (*irq_postinstall)(struct msm_kms *kms);
  29         void (*irq_uninstall)(struct msm_kms *kms);
  30         irqreturn_t (*irq)(struct msm_kms *kms);
  31         int (*enable_vblank)(struct msm_kms *kms, struct drm_crtc *crtc);
  32         void (*disable_vblank)(struct msm_kms *kms, struct drm_crtc *crtc);
  33
  34         /*
  35          * Atomic commit handling:
  36          *
  37          * Note that in the case of async commits, the funcs which take
  38          * a crtc_mask (ie. ->flush_commit(), and ->complete_commit())
  39          * might not be evenly balanced with ->prepare_commit(), however
  40          * each crtc that effected by a ->prepare_commit() (potentially
  41          * multiple times) will eventually (at end of vsync period) be
  42          * flushed and completed.
  43          *
  44          * This has some implications about tracking of cleanup state,
  45          * for example SMP blocks to release after commit completes.  Ie.
  46          * cleanup state should be also duplicated in the various
  47          * duplicate_state() methods, as the current cleanup state at
  48          * ->complete_commit() time may have accumulated cleanup work
  49          * from multiple commits.
  50          */
  51
  52         /**
  53          * Enable/disable power/clks needed for hw access done in other
  54          * commit related methods.
  55          *
  56          * If mdp4 is migrated to runpm, we could probably drop these
  57          * and use runpm directly.
  58          */
  59         void (*enable_commit)(struct msm_kms *kms);
  60         void (*disable_commit)(struct msm_kms *kms);
  61
  62         /**
  63          * If the kms backend supports async commit, it should implement
  64          * this method to return the time of the next vsync.  This is
  65          * used to determine a time slightly before vsync, for the async
  66          * commit timer to run and complete an async commit.
  67          */
  68         ktime_t (*vsync_time)(struct msm_kms *kms, struct drm_crtc *crtc);
  69
  70         /**
  71          * Prepare for atomic commit.  This is called after any previous
  72          * (async or otherwise) commit has completed.
  73          */
  74         void (*prepare_commit)(struct msm_kms *kms, struct drm_atomic_state *state);
  75
  76         /**
  77          * Flush an atomic commit.  This is called after the hardware
  78          * updates have already been pushed down to effected planes/
  79          * crtcs/encoders/connectors.
  80          */
  81         void (*flush_commit)(struct msm_kms *kms, unsigned crtc_mask);
  82
  83         /**
  84          * Wait for any in-progress flush to complete on the specified
  85          * crtcs.  This should not block if there is no in-progress
  86          * commit (ie. don't just wait for a vblank), as it will also
  87          * be called before ->prepare_commit() to ensure any potential
  88          * "async" commit has completed.
  89          */
  90         void (*wait_flush)(struct msm_kms *kms, unsigned crtc_mask);
  91
  92         /**
  93          * Clean up after commit is completed.  This is called after
  94          * ->wait_flush(), to give the backend a chance to do any
  95          * post-commit cleanup.
  96          */
  97         void (*complete_commit)(struct msm_kms *kms, unsigned crtc_mask);
  98
  99         /*
 100          * Format handling:
 101          */
 102
 103         /* get msm_format w/ optional format modifiers from drm_mode_fb_cmd2 */
 104         const struct msm_format *(*get_format)(struct msm_kms *kms,
 105                                         const uint32_t format,
 106                                         const uint64_t modifiers);
 107         /* do format checking on format modified through fb_cmd2 modifiers */
 108         int (*check_modified_format)(const struct msm_kms *kms,
 109                         const struct msm_format *msm_fmt,
 110                         const struct drm_mode_fb_cmd2 *cmd,
 111                         struct drm_gem_object **bos);
 112
 113         /* misc: */
 114         long (*round_pixclk)(struct msm_kms *kms, unsigned long rate,
 115                         struct drm_encoder *encoder);
 116         int (*set_split_display)(struct msm_kms *kms,
 117                         struct drm_encoder *encoder,
 118                         struct drm_encoder *slave_encoder,
 119                         bool is_cmd_mode);
 120         void (*set_encoder_mode)(struct msm_kms *kms,
 121                                  struct drm_encoder *encoder,
 122                                  bool cmd_mode);
 123         /* cleanup: */
 124         void (*destroy)(struct msm_kms *kms);
 125 #ifdef CONFIG_DEBUG_FS
 126         /* debugfs: */
 127         int (*debugfs_init)(struct msm_kms *kms, struct drm_minor *minor);
 128 #endif
 129 };
 130
 131 struct msm_kms;
 132
 133 /*
 134  * A per-crtc timer for pending async atomic flushes.  Scheduled to expire
 135  * shortly before vblank to flush pending async updates.
 136  */
 137 struct msm_pending_timer {
 138         struct hrtimer timer;
 139         struct kthread_work work;
 140         struct kthread_worker *worker;
 141         struct msm_kms *kms;
 142         unsigned crtc_idx;
 143 };
 144
 145 struct msm_kms {
 146         const struct msm_kms_funcs *funcs;
 147         struct drm_device *dev;
 148
 149         /* irq number to be passed on to drm_irq_install */
 150         int irq;
 151
 152         /* mapper-id used to request GEM buffer mapped for scanout: */
 153         struct msm_gem_address_space *aspace;
 154
 155         /*
 156          * For async commit, where ->flush_commit() and later happens
 157          * from the crtc's pending_timer close to end of the frame:
 158          */
 159         struct mutex commit_lock[MAX_CRTCS];
 160         unsigned pending_crtc_mask;
 161         struct msm_pending_timer pending_timers[MAX_CRTCS];
 162 };
 163
 164 static inline int msm_kms_init(struct msm_kms *kms,
 165                 const struct msm_kms_funcs *funcs)
 166 {
 167         unsigned i, ret;
 168
 169         for (i = 0; i < ARRAY_SIZE(kms->commit_lock); i++)
 170                 mutex_init(&kms->commit_lock[i]);
 171
 172         kms->funcs = funcs;
 173
 174         for (i = 0; i < ARRAY_SIZE(kms->pending_timers); i++) {
 175                 ret = msm_atomic_init_pending_timer(&kms->pending_timers[i], kms, i);
 176                 if (ret) {
 177                         return ret;
 178                 }
 179         }
 180
 181         return 0;
 182 }
 183
 184 static inline void msm_kms_destroy(struct msm_kms *kms)
 185 {
 186         unsigned i;
 187
 188         for (i = 0; i < ARRAY_SIZE(kms->pending_timers); i++)
 189                 msm_atomic_destroy_pending_timer(&kms->pending_timers[i]);
 190 }
 191
 192 struct msm_kms *mdp4_kms_init(struct drm_device *dev);
 193 struct msm_kms *mdp5_kms_init(struct drm_device *dev);
 194 struct msm_kms *dpu_kms_init(struct drm_device *dev);
 195
 196 struct msm_mdss_funcs {
 197         int (*enable)(struct msm_mdss *mdss);
 198         int (*disable)(struct msm_mdss *mdss);
 199         void (*destroy)(struct drm_device *dev);
 200 };
 201
 202 struct msm_mdss {
 203         struct drm_device *dev;
 204         const struct msm_mdss_funcs *funcs;
 205 };
 206
 207 int mdp5_mdss_init(struct drm_device *dev);
 208 int dpu_mdss_init(struct drm_device *dev);
 209
 210 #define for_each_crtc_mask(dev, crtc, crtc_mask) \
 211         drm_for_each_crtc(crtc, dev) \
 212                 for_each_if (drm_crtc_mask(crtc) & (crtc_mask))
 213
 214 #define for_each_crtc_mask_reverse(dev, crtc, crtc_mask) \
 215         drm_for_each_crtc_reverse(crtc, dev) \
 216                 for_each_if (drm_crtc_mask(crtc) & (crtc_mask))
 217
 218 #endif /* __MSM_KMS_H__ */