/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright ( c ) 2014 , The Linux Foundation . All rights reserved .
* Copyright ( C ) 2013 Red Hat
* Author : Rob Clark < robdclark @ gmail . com >
*/
#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);
struct mdp5_global_state;
void mdp5_smp_dump(struct mdp5_smp *smp, struct drm_printer *p,
struct mdp5_global_state *global_state);
uint32_t mdp5_smp_calculate(struct mdp5_smp *smp,
const struct msm_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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