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