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 void mdp5_smp_destroy(struct mdp5_smp *smp); 72 73 void mdp5_smp_dump(struct mdp5_smp *smp, struct drm_printer *p); 74 75 uint32_t mdp5_smp_calculate(struct mdp5_smp *smp, 76 const struct mdp_format *format, 77 u32 width, bool hdecim); 78 79 int mdp5_smp_assign(struct mdp5_smp *smp, struct mdp5_smp_state *state, 80 enum mdp5_pipe pipe, uint32_t blkcfg); 81 void mdp5_smp_release(struct mdp5_smp *smp, struct mdp5_smp_state *state, 82 enum mdp5_pipe pipe); 83 84 void mdp5_smp_prepare_commit(struct mdp5_smp *smp, struct mdp5_smp_state *state); 85 void mdp5_smp_complete_commit(struct mdp5_smp *smp, struct mdp5_smp_state *state); 86 87 #endif /* __MDP5_SMP_H__ */ 88