linux/drivers/gpu/drm/msm/disp/mdp5/mdp5_pipe.c
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   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Copyright (C) 2016 Red Hat
   4 * Author: Rob Clark <robdclark@gmail.com>
   5 */
   6
   7#include "mdp5_kms.h"
   8
   9int mdp5_pipe_assign(struct drm_atomic_state *s, struct drm_plane *plane,
  10                     uint32_t caps, uint32_t blkcfg,
  11                     struct mdp5_hw_pipe **hwpipe,
  12                     struct mdp5_hw_pipe **r_hwpipe)
  13{
  14        struct msm_drm_private *priv = s->dev->dev_private;
  15        struct mdp5_kms *mdp5_kms = to_mdp5_kms(to_mdp_kms(priv->kms));
  16        struct mdp5_global_state *new_global_state, *old_global_state;
  17        struct mdp5_hw_pipe_state *old_state, *new_state;
  18        int i, j;
  19
  20        new_global_state = mdp5_get_global_state(s);
  21        if (IS_ERR(new_global_state))
  22                return PTR_ERR(new_global_state);
  23
  24        /* grab old_state after mdp5_get_global_state(), since now we hold lock: */
  25        old_global_state = mdp5_get_existing_global_state(mdp5_kms);
  26
  27        old_state = &old_global_state->hwpipe;
  28        new_state = &new_global_state->hwpipe;
  29
  30        for (i = 0; i < mdp5_kms->num_hwpipes; i++) {
  31                struct mdp5_hw_pipe *cur = mdp5_kms->hwpipes[i];
  32
  33                /* skip if already in-use.. check both new and old state,
  34                 * since we cannot immediately re-use a pipe that is
  35                 * released in the current update in some cases:
  36                 *  (1) mdp5 can have SMP (non-double-buffered)
  37                 *  (2) hw pipe previously assigned to different CRTC
  38                 *      (vblanks might not be aligned)
  39                 */
  40                if (new_state->hwpipe_to_plane[cur->idx] ||
  41                                old_state->hwpipe_to_plane[cur->idx])
  42                        continue;
  43
  44                /* skip if doesn't support some required caps: */
  45                if (caps & ~cur->caps)
  46                        continue;
  47
  48                /*
  49                 * don't assign a cursor pipe to a plane that isn't going to
  50                 * be used as a cursor
  51                 */
  52                if (cur->caps & MDP_PIPE_CAP_CURSOR &&
  53                                plane->type != DRM_PLANE_TYPE_CURSOR)
  54                        continue;
  55
  56                /* possible candidate, take the one with the
  57                 * fewest unneeded caps bits set:
  58                 */
  59                if (!(*hwpipe) || (hweight_long(cur->caps & ~caps) <
  60                                   hweight_long((*hwpipe)->caps & ~caps))) {
  61                        bool r_found = false;
  62
  63                        if (r_hwpipe) {
  64                                for (j = i + 1; j < mdp5_kms->num_hwpipes;
  65                                     j++) {
  66                                        struct mdp5_hw_pipe *r_cur =
  67                                                        mdp5_kms->hwpipes[j];
  68
  69                                        /* reject different types of hwpipes */
  70                                        if (r_cur->caps != cur->caps)
  71                                                continue;
  72
  73                                        /* respect priority, eg. VIG0 > VIG1 */
  74                                        if (cur->pipe > r_cur->pipe)
  75                                                continue;
  76
  77                                        *r_hwpipe = r_cur;
  78                                        r_found = true;
  79                                        break;
  80                                }
  81                        }
  82
  83                        if (!r_hwpipe || r_found)
  84                                *hwpipe = cur;
  85                }
  86        }
  87
  88        if (!(*hwpipe))
  89                return -ENOMEM;
  90
  91        if (r_hwpipe && !(*r_hwpipe))
  92                return -ENOMEM;
  93
  94        if (mdp5_kms->smp) {
  95                int ret;
  96
  97                /* We don't support SMP and 2 hwpipes/plane together */
  98                WARN_ON(r_hwpipe);
  99
 100                DBG("%s: alloc SMP blocks", (*hwpipe)->name);
 101                ret = mdp5_smp_assign(mdp5_kms->smp, &new_global_state->smp,
 102                                (*hwpipe)->pipe, blkcfg);
 103                if (ret)
 104                        return -ENOMEM;
 105
 106                (*hwpipe)->blkcfg = blkcfg;
 107        }
 108
 109        DBG("%s: assign to plane %s for caps %x",
 110                        (*hwpipe)->name, plane->name, caps);
 111        new_state->hwpipe_to_plane[(*hwpipe)->idx] = plane;
 112
 113        if (r_hwpipe) {
 114                DBG("%s: assign to right of plane %s for caps %x",
 115                    (*r_hwpipe)->name, plane->name, caps);
 116                new_state->hwpipe_to_plane[(*r_hwpipe)->idx] = plane;
 117        }
 118
 119        return 0;
 120}
 121
 122void mdp5_pipe_release(struct drm_atomic_state *s, struct mdp5_hw_pipe *hwpipe)
 123{
 124        struct msm_drm_private *priv = s->dev->dev_private;
 125        struct mdp5_kms *mdp5_kms = to_mdp5_kms(to_mdp_kms(priv->kms));
 126        struct mdp5_global_state *state = mdp5_get_global_state(s);
 127        struct mdp5_hw_pipe_state *new_state = &state->hwpipe;
 128
 129        if (!hwpipe)
 130                return;
 131
 132        if (WARN_ON(!new_state->hwpipe_to_plane[hwpipe->idx]))
 133                return;
 134
 135        DBG("%s: release from plane %s", hwpipe->name,
 136                new_state->hwpipe_to_plane[hwpipe->idx]->name);
 137
 138        if (mdp5_kms->smp) {
 139                DBG("%s: free SMP blocks", hwpipe->name);
 140                mdp5_smp_release(mdp5_kms->smp, &state->smp, hwpipe->pipe);
 141        }
 142
 143        new_state->hwpipe_to_plane[hwpipe->idx] = NULL;
 144}
 145
 146void mdp5_pipe_destroy(struct mdp5_hw_pipe *hwpipe)
 147{
 148        kfree(hwpipe);
 149}
 150
 151struct mdp5_hw_pipe *mdp5_pipe_init(enum mdp5_pipe pipe,
 152                uint32_t reg_offset, uint32_t caps)
 153{
 154        struct mdp5_hw_pipe *hwpipe;
 155
 156        hwpipe = kzalloc(sizeof(*hwpipe), GFP_KERNEL);
 157        if (!hwpipe)
 158                return ERR_PTR(-ENOMEM);
 159
 160        hwpipe->name = pipe2name(pipe);
 161        hwpipe->pipe = pipe;
 162        hwpipe->reg_offset = reg_offset;
 163        hwpipe->caps = caps;
 164        hwpipe->flush_mask = mdp_ctl_flush_mask_pipe(pipe);
 165
 166        return hwpipe;
 167}
 168