xref: /linux/drivers/gpu/drm/msm/disp/mdp5/mdp5_smp.h (revision 2b0cfa6e49566c8fa6759734cf821aa6e8271a9e)
1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * Copyright (c) 2014, The Linux Foundation. All rights reserved.
4  * Copyright (C) 2013 Red Hat
5  * Author: Rob Clark <robdclark@gmail.com>
6  */
7 
8 #ifndef __MDP5_SMP_H__
9 #define __MDP5_SMP_H__
10 
11 #include <drm/drm_print.h>
12 
13 #include "msm_drv.h"
14 
15 /*
16  * SMP - Shared Memory Pool:
17  *
18  * SMP blocks are shared between all the clients, where each plane in
19  * a scanout buffer is a SMP client.  Ie. scanout of 3 plane I420 on
20  * pipe VIG0 => 3 clients: VIG0_Y, VIG0_CB, VIG0_CR.
21  *
22  * Based on the size of the attached scanout buffer, a certain # of
23  * blocks must be allocated to that client out of the shared pool.
24  *
25  * In some hw, some blocks are statically allocated for certain pipes
26  * and CANNOT be re-allocated (eg: MMB0 and MMB1 both tied to RGB0).
27  *
28  *
29  * Atomic SMP State:
30  *
31  * On atomic updates that modify SMP configuration, the state is cloned
32  * (copied) and modified.  For test-only, or in cases where atomic
33  * update fails (or if we hit ww_mutex deadlock/backoff condition) the
34  * new state is simply thrown away.
35  *
36  * Because the SMP registers are not double buffered, updates are a
37  * two step process:
38  *
39  * 1) in _prepare_commit() we configure things (via read-modify-write)
40  *    for the newly assigned pipes, so we don't take away blocks
41  *    assigned to pipes that are still scanning out
42  * 2) in _complete_commit(), after vblank/etc, we clear things for the
43  *    released clients, since at that point old pipes are no longer
44  *    scanning out.
45  */
46 struct mdp5_smp_state {
47 	/* global state of what blocks are in use: */
48 	mdp5_smp_state_t state;
49 
50 	/* per client state of what blocks they are using: */
51 	mdp5_smp_state_t client_state[MAX_CLIENTS];
52 
53 	/* assigned pipes (hw updated at _prepare_commit()): */
54 	unsigned long assigned;
55 
56 	/* released pipes (hw updated at _complete_commit()): */
57 	unsigned long released;
58 };
59 
60 struct mdp5_kms;
61 struct mdp5_smp;
62 
63 /*
64  * SMP module prototypes:
65  * mdp5_smp_init() returns a SMP @handler,
66  * which is then used to call the other mdp5_smp_*(handler, ...) functions.
67  */
68 
69 struct mdp5_smp *mdp5_smp_init(struct mdp5_kms *mdp5_kms,
70 		const struct mdp5_smp_block *cfg);
71 
72 void mdp5_smp_dump(struct mdp5_smp *smp, struct drm_printer *p);
73 
74 uint32_t mdp5_smp_calculate(struct mdp5_smp *smp,
75 		const struct mdp_format *format,
76 		u32 width, bool hdecim);
77 
78 int mdp5_smp_assign(struct mdp5_smp *smp, struct mdp5_smp_state *state,
79 		enum mdp5_pipe pipe, uint32_t blkcfg);
80 void mdp5_smp_release(struct mdp5_smp *smp, struct mdp5_smp_state *state,
81 		enum mdp5_pipe pipe);
82 
83 void mdp5_smp_prepare_commit(struct mdp5_smp *smp, struct mdp5_smp_state *state);
84 void mdp5_smp_complete_commit(struct mdp5_smp *smp, struct mdp5_smp_state *state);
85 
86 #endif /* __MDP5_SMP_H__ */
87