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