LXR linux/drivers/gpu/drm/msm/disp/mdp5/mdp5

   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 */
  46struct 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
  60struct mdp5_kms;
  61struct 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
  69struct mdp5_smp *mdp5_smp_init(struct mdp5_kms *mdp5_kms,
  70                const struct mdp5_smp_block *cfg);
  71void  mdp5_smp_destroy(struct mdp5_smp *smp);
  72
  73void mdp5_smp_dump(struct mdp5_smp *smp, struct drm_printer *p);
  74
  75uint32_t mdp5_smp_calculate(struct mdp5_smp *smp,
  76                const struct mdp_format *format,
  77                u32 width, bool hdecim);
  78
  79int mdp5_smp_assign(struct mdp5_smp *smp, struct mdp5_smp_state *state,
  80                enum mdp5_pipe pipe, uint32_t blkcfg);
  81void mdp5_smp_release(struct mdp5_smp *smp, struct mdp5_smp_state *state,
  82                enum mdp5_pipe pipe);
  83
  84void mdp5_smp_prepare_commit(struct mdp5_smp *smp, struct mdp5_smp_state *state);
  85void mdp5_smp_complete_commit(struct mdp5_smp *smp, struct mdp5_smp_state *state);
  86
  87#endif /* __MDP5_SMP_H__ */
  88