LXR linux/drivers/gpu/drm/msm/mdp/mdp5/mdp5

   1/*
   2 * Copyright (C) 2017 The Linux Foundation. All rights reserved.
   3 *
   4 * This program is free software; you can redistribute it and/or modify it
   5 * under the terms of the GNU General Public License version 2 as published by
   6 * the Free Software Foundation.
   7 *
   8 * This program is distributed in the hope that it will be useful, but WITHOUT
   9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11 * more details.
  12 *
  13 * You should have received a copy of the GNU General Public License along with
  14 * this program.  If not, see <http://www.gnu.org/licenses/>.
  15 */
  16
  17#include "mdp5_kms.h"
  18
  19/*
  20 * As of now, there are only 2 combinations possible for source split:
  21 *
  22 * Left | Right
  23 * -----|------
  24 *  LM0 | LM1
  25 *  LM2 | LM5
  26 *
  27 */
  28static int lm_right_pair[] = { 1, -1, 5, -1, -1, -1 };
  29
  30static int get_right_pair_idx(struct mdp5_kms *mdp5_kms, int lm)
  31{
  32        int i;
  33        int pair_lm;
  34
  35        pair_lm = lm_right_pair[lm];
  36        if (pair_lm < 0)
  37                return -EINVAL;
  38
  39        for (i = 0; i < mdp5_kms->num_hwmixers; i++) {
  40                struct mdp5_hw_mixer *mixer = mdp5_kms->hwmixers[i];
  41
  42                if (mixer->lm == pair_lm)
  43                        return mixer->idx;
  44        }
  45
  46        return -1;
  47}
  48
  49int mdp5_mixer_assign(struct drm_atomic_state *s, struct drm_crtc *crtc,
  50                      uint32_t caps, struct mdp5_hw_mixer **mixer,
  51                      struct mdp5_hw_mixer **r_mixer)
  52{
  53        struct msm_drm_private *priv = s->dev->dev_private;
  54        struct mdp5_kms *mdp5_kms = to_mdp5_kms(to_mdp_kms(priv->kms));
  55        struct mdp5_state *state = mdp5_get_state(s);
  56        struct mdp5_hw_mixer_state *new_state;
  57        int i;
  58
  59        if (IS_ERR(state))
  60                return PTR_ERR(state);
  61
  62        new_state = &state->hwmixer;
  63
  64        for (i = 0; i < mdp5_kms->num_hwmixers; i++) {
  65                struct mdp5_hw_mixer *cur = mdp5_kms->hwmixers[i];
  66
  67                /*
  68                 * skip if already in-use by a different CRTC. If there is a
  69                 * mixer already assigned to this CRTC, it means this call is
  70                 * a request to get an additional right mixer. Assume that the
  71                 * existing mixer is the 'left' one, and try to see if we can
  72                 * get its corresponding 'right' pair.
  73                 */
  74                if (new_state->hwmixer_to_crtc[cur->idx] &&
  75                    new_state->hwmixer_to_crtc[cur->idx] != crtc)
  76                        continue;
  77
  78                /* skip if doesn't support some required caps: */
  79                if (caps & ~cur->caps)
  80                        continue;
  81
  82                if (r_mixer) {
  83                        int pair_idx;
  84
  85                        pair_idx = get_right_pair_idx(mdp5_kms, cur->lm);
  86                        if (pair_idx < 0)
  87                                return -EINVAL;
  88
  89                        if (new_state->hwmixer_to_crtc[pair_idx])
  90                                continue;
  91
  92                        *r_mixer = mdp5_kms->hwmixers[pair_idx];
  93                }
  94
  95                /*
  96                 * prefer a pair-able LM over an unpairable one. We can
  97                 * switch the CRTC from Normal mode to Source Split mode
  98                 * without requiring a full modeset if we had already
  99                 * assigned this CRTC a pair-able LM.
 100                 *
 101                 * TODO: There will be assignment sequences which would
 102                 * result in the CRTC requiring a full modeset, even
 103                 * if we have the LM resources to prevent it. For a platform
 104                 * with a few displays, we don't run out of pair-able LMs
 105                 * so easily. For now, ignore the possibility of requiring
 106                 * a full modeset.
 107                 */
 108                if (!(*mixer) || cur->caps & MDP_LM_CAP_PAIR)
 109                        *mixer = cur;
 110        }
 111
 112        if (!(*mixer))
 113                return -ENOMEM;
 114
 115        if (r_mixer && !(*r_mixer))
 116                return -ENOMEM;
 117
 118        DBG("assigning Layer Mixer %d to crtc %s", (*mixer)->lm, crtc->name);
 119
 120        new_state->hwmixer_to_crtc[(*mixer)->idx] = crtc;
 121        if (r_mixer) {
 122                DBG("assigning Right Layer Mixer %d to crtc %s", (*r_mixer)->lm,
 123                    crtc->name);
 124                new_state->hwmixer_to_crtc[(*r_mixer)->idx] = crtc;
 125        }
 126
 127        return 0;
 128}
 129
 130void mdp5_mixer_release(struct drm_atomic_state *s, struct mdp5_hw_mixer *mixer)
 131{
 132        struct mdp5_state *state = mdp5_get_state(s);
 133        struct mdp5_hw_mixer_state *new_state = &state->hwmixer;
 134
 135        if (!mixer)
 136                return;
 137
 138        if (WARN_ON(!new_state->hwmixer_to_crtc[mixer->idx]))
 139                return;
 140
 141        DBG("%s: release from crtc %s", mixer->name,
 142            new_state->hwmixer_to_crtc[mixer->idx]->name);
 143
 144        new_state->hwmixer_to_crtc[mixer->idx] = NULL;
 145}
 146
 147void mdp5_mixer_destroy(struct mdp5_hw_mixer *mixer)
 148{
 149        kfree(mixer);
 150}
 151
 152static const char * const mixer_names[] = {
 153        "LM0", "LM1", "LM2", "LM3", "LM4", "LM5",
 154};
 155
 156struct mdp5_hw_mixer *mdp5_mixer_init(const struct mdp5_lm_instance *lm)
 157{
 158        struct mdp5_hw_mixer *mixer;
 159
 160        mixer = kzalloc(sizeof(*mixer), GFP_KERNEL);
 161        if (!mixer)
 162                return ERR_PTR(-ENOMEM);
 163
 164        mixer->name = mixer_names[lm->id];
 165        mixer->lm = lm->id;
 166        mixer->caps = lm->caps;
 167        mixer->pp = lm->pp;
 168        mixer->dspp = lm->dspp;
 169        mixer->flush_mask = mdp_ctl_flush_mask_lm(lm->id);
 170
 171        return mixer;
 172}
 173