2 * Copyright (c) 2014, The Linux Foundation. All rights reserved.
3 * Copyright (C) 2013 Red Hat
4 * Author: Rob Clark <robdclark@gmail.com>
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 as published by
8 * the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 * You should have received a copy of the GNU General Public License along with
16 * this program. If not, see <http://www.gnu.org/licenses/>.
19 #ifndef __MDP5_SMP_H__
20 #define __MDP5_SMP_H__
22 #include <drm/drm_print.h>
27 * SMP - Shared Memory Pool:
29 * SMP blocks are shared between all the clients, where each plane in
30 * a scanout buffer is a SMP client. Ie. scanout of 3 plane I420 on
31 * pipe VIG0 => 3 clients: VIG0_Y, VIG0_CB, VIG0_CR.
33 * Based on the size of the attached scanout buffer, a certain # of
34 * blocks must be allocated to that client out of the shared pool.
36 * In some hw, some blocks are statically allocated for certain pipes
37 * and CANNOT be re-allocated (eg: MMB0 and MMB1 both tied to RGB0).
42 * On atomic updates that modify SMP configuration, the state is cloned
43 * (copied) and modified. For test-only, or in cases where atomic
44 * update fails (or if we hit ww_mutex deadlock/backoff condition) the
45 * new state is simply thrown away.
47 * Because the SMP registers are not double buffered, updates are a
50 * 1) in _prepare_commit() we configure things (via read-modify-write)
51 * for the newly assigned pipes, so we don't take away blocks
52 * assigned to pipes that are still scanning out
53 * 2) in _complete_commit(), after vblank/etc, we clear things for the
54 * released clients, since at that point old pipes are no longer
57 struct mdp5_smp_state {
58 /* global state of what blocks are in use: */
59 mdp5_smp_state_t state;
61 /* per client state of what blocks they are using: */
62 mdp5_smp_state_t client_state[MAX_CLIENTS];
64 /* assigned pipes (hw updated at _prepare_commit()): */
65 unsigned long assigned;
67 /* released pipes (hw updated at _complete_commit()): */
68 unsigned long released;
75 * SMP module prototypes:
76 * mdp5_smp_init() returns a SMP @handler,
77 * which is then used to call the other mdp5_smp_*(handler, ...) functions.
80 struct mdp5_smp *mdp5_smp_init(struct mdp5_kms *mdp5_kms,
81 const struct mdp5_smp_block *cfg);
82 void mdp5_smp_destroy(struct mdp5_smp *smp);
84 void mdp5_smp_dump(struct mdp5_smp *smp, struct drm_printer *p);
86 uint32_t mdp5_smp_calculate(struct mdp5_smp *smp,
87 const struct mdp_format *format,
88 u32 width, bool hdecim);
90 int mdp5_smp_assign(struct mdp5_smp *smp, struct mdp5_smp_state *state,
91 enum mdp5_pipe pipe, uint32_t blkcfg);
92 void mdp5_smp_release(struct mdp5_smp *smp, struct mdp5_smp_state *state,
95 void mdp5_smp_prepare_commit(struct mdp5_smp *smp, struct mdp5_smp_state *state);
96 void mdp5_smp_complete_commit(struct mdp5_smp *smp, struct mdp5_smp_state *state);
98 #endif /* __MDP5_SMP_H__ */