1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2017 The Linux Foundation. All rights reserved.
4 */
5
6 #include "mdp5_kms.h"
7
8 /*
9 * As of now, there are only 2 combinations possible for source split:
10 *
11 * Left | Right
12 * -----|------
13 * LM0 | LM1
14 * LM2 | LM5
15 *
16 */
17 static int lm_right_pair[] = { 1, -1, 5, -1, -1, -1 };
18
get_right_pair_idx(struct mdp5_kms * mdp5_kms,int lm)19 static int get_right_pair_idx(struct mdp5_kms *mdp5_kms, int lm)
20 {
21 int i;
22 int pair_lm;
23
24 pair_lm = lm_right_pair[lm];
25 if (pair_lm < 0)
26 return -EINVAL;
27
28 for (i = 0; i < mdp5_kms->num_hwmixers; i++) {
29 struct mdp5_hw_mixer *mixer = mdp5_kms->hwmixers[i];
30
31 if (mixer->lm == pair_lm)
32 return mixer->idx;
33 }
34
35 return -1;
36 }
37
mdp5_mixer_assign(struct drm_atomic_state * s,struct drm_crtc * crtc,uint32_t caps,struct mdp5_hw_mixer ** mixer,struct mdp5_hw_mixer ** r_mixer)38 int mdp5_mixer_assign(struct drm_atomic_state *s, struct drm_crtc *crtc,
39 uint32_t caps, struct mdp5_hw_mixer **mixer,
40 struct mdp5_hw_mixer **r_mixer)
41 {
42 struct msm_drm_private *priv = s->dev->dev_private;
43 struct mdp5_kms *mdp5_kms = to_mdp5_kms(to_mdp_kms(priv->kms));
44 struct mdp5_global_state *global_state = mdp5_get_global_state(s);
45 struct mdp5_hw_mixer_state *new_state;
46 int i;
47
48 if (IS_ERR(global_state))
49 return PTR_ERR(global_state);
50
51 new_state = &global_state->hwmixer;
52
53 for (i = 0; i < mdp5_kms->num_hwmixers; i++) {
54 struct mdp5_hw_mixer *cur = mdp5_kms->hwmixers[i];
55
56 /*
57 * skip if already in-use by a different CRTC. If there is a
58 * mixer already assigned to this CRTC, it means this call is
59 * a request to get an additional right mixer. Assume that the
60 * existing mixer is the 'left' one, and try to see if we can
61 * get its corresponding 'right' pair.
62 */
63 if (new_state->hwmixer_to_crtc[cur->idx] &&
64 new_state->hwmixer_to_crtc[cur->idx] != crtc)
65 continue;
66
67 /* skip if doesn't support some required caps: */
68 if (caps & ~cur->caps)
69 continue;
70
71 if (r_mixer) {
72 int pair_idx;
73
74 pair_idx = get_right_pair_idx(mdp5_kms, cur->lm);
75 if (pair_idx < 0)
76 return -EINVAL;
77
78 if (new_state->hwmixer_to_crtc[pair_idx])
79 continue;
80
81 *r_mixer = mdp5_kms->hwmixers[pair_idx];
82 }
83
84 /*
85 * prefer a pair-able LM over an unpairable one. We can
86 * switch the CRTC from Normal mode to Source Split mode
87 * without requiring a full modeset if we had already
88 * assigned this CRTC a pair-able LM.
89 *
90 * TODO: There will be assignment sequences which would
91 * result in the CRTC requiring a full modeset, even
92 * if we have the LM resources to prevent it. For a platform
93 * with a few displays, we don't run out of pair-able LMs
94 * so easily. For now, ignore the possibility of requiring
95 * a full modeset.
96 */
97 if (!(*mixer) || cur->caps & MDP_LM_CAP_PAIR)
98 *mixer = cur;
99 }
100
101 if (!(*mixer))
102 return -ENOMEM;
103
104 if (r_mixer && !(*r_mixer))
105 return -ENOMEM;
106
107 DBG("assigning Layer Mixer %d to crtc %s", (*mixer)->lm, crtc->name);
108
109 new_state->hwmixer_to_crtc[(*mixer)->idx] = crtc;
110 if (r_mixer) {
111 DBG("assigning Right Layer Mixer %d to crtc %s", (*r_mixer)->lm,
112 crtc->name);
113 new_state->hwmixer_to_crtc[(*r_mixer)->idx] = crtc;
114 }
115
116 return 0;
117 }
118
mdp5_mixer_release(struct drm_atomic_state * s,struct mdp5_hw_mixer * mixer)119 int mdp5_mixer_release(struct drm_atomic_state *s, struct mdp5_hw_mixer *mixer)
120 {
121 struct mdp5_global_state *global_state = mdp5_get_global_state(s);
122 struct mdp5_hw_mixer_state *new_state;
123
124 if (!mixer)
125 return 0;
126
127 if (IS_ERR(global_state))
128 return PTR_ERR(global_state);
129
130 new_state = &global_state->hwmixer;
131
132 if (WARN_ON(!new_state->hwmixer_to_crtc[mixer->idx]))
133 return -EINVAL;
134
135 DBG("%s: release from crtc %s", mixer->name,
136 new_state->hwmixer_to_crtc[mixer->idx]->name);
137
138 new_state->hwmixer_to_crtc[mixer->idx] = NULL;
139
140 return 0;
141 }
142
mdp5_mixer_destroy(struct mdp5_hw_mixer * mixer)143 void mdp5_mixer_destroy(struct mdp5_hw_mixer *mixer)
144 {
145 kfree(mixer);
146 }
147
148 static const char * const mixer_names[] = {
149 "LM0", "LM1", "LM2", "LM3", "LM4", "LM5",
150 };
151
mdp5_mixer_init(const struct mdp5_lm_instance * lm)152 struct mdp5_hw_mixer *mdp5_mixer_init(const struct mdp5_lm_instance *lm)
153 {
154 struct mdp5_hw_mixer *mixer;
155
156 mixer = kzalloc(sizeof(*mixer), GFP_KERNEL);
157 if (!mixer)
158 return ERR_PTR(-ENOMEM);
159
160 mixer->name = mixer_names[lm->id];
161 mixer->lm = lm->id;
162 mixer->caps = lm->caps;
163 mixer->pp = lm->pp;
164 mixer->dspp = lm->dspp;
165 mixer->flush_mask = mdp_ctl_flush_mask_lm(lm->id);
166
167 return mixer;
168 }
169