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
mdp5_pipe_assign(struct drm_atomic_state * s,struct drm_plane * plane,uint32_t caps,uint32_t blkcfg,struct mdp5_hw_pipe ** hwpipe,struct mdp5_hw_pipe ** r_hwpipe)9 int 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
mdp5_pipe_release(struct drm_atomic_state * s,struct mdp5_hw_pipe * hwpipe)122 int 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;
127 struct mdp5_hw_pipe_state *new_state;
128
129 if (!hwpipe)
130 return 0;
131
132 state = mdp5_get_global_state(s);
133 if (IS_ERR(state))
134 return PTR_ERR(state);
135
136 new_state = &state->hwpipe;
137
138 if (WARN_ON(!new_state->hwpipe_to_plane[hwpipe->idx]))
139 return -EINVAL;
140
141 DBG("%s: release from plane %s", hwpipe->name,
142 new_state->hwpipe_to_plane[hwpipe->idx]->name);
143
144 if (mdp5_kms->smp) {
145 DBG("%s: free SMP blocks", hwpipe->name);
146 mdp5_smp_release(mdp5_kms->smp, &state->smp, hwpipe->pipe);
147 }
148
149 new_state->hwpipe_to_plane[hwpipe->idx] = NULL;
150
151 return 0;
152 }
153
mdp5_pipe_init(struct drm_device * dev,enum mdp5_pipe pipe,uint32_t reg_offset,uint32_t caps)154 struct mdp5_hw_pipe *mdp5_pipe_init(struct drm_device *dev,
155 enum mdp5_pipe pipe,
156 uint32_t reg_offset, uint32_t caps)
157 {
158 struct mdp5_hw_pipe *hwpipe;
159
160 hwpipe = devm_kzalloc(dev->dev, sizeof(*hwpipe), GFP_KERNEL);
161 if (!hwpipe)
162 return ERR_PTR(-ENOMEM);
163
164 hwpipe->name = pipe2name(pipe);
165 hwpipe->pipe = pipe;
166 hwpipe->reg_offset = reg_offset;
167 hwpipe->caps = caps;
168 hwpipe->flush_mask = mdp_ctl_flush_mask_pipe(pipe);
169
170 return hwpipe;
171 }
172