linux/drivers/gpu/drm/amd/display/dc/dml2/dml21/src/dml2_top/dml_top_mcache.c

// SPDX-License-Identifier: MIT
//
// Copyright 2024 Advanced Micro Devices, Inc.


#include "dml2_debug.h"

#include "dml_top_mcache.h"
#include "lib_float_math.h"

#include "dml2_internal_shared_types.h"

/*
* Takes an input set of mcache boundaries and finds the appropriate setting of cache programming.
* Returns true if a valid set of programming can be made, and false otherwise. "Valid" means
* that the horizontal viewport does not span more than 2 cache slices.
*
* It optionally also can apply a constant shift to all the cache boundaries.
*/
static const uint32_t MCACHE_ID_UNASSIGNED = …;
static const uint32_t SPLIT_LOCATION_UNDEFINED = …;

static bool calculate_first_second_splitting(const int *mcache_boundaries, int num_boundaries, int shift,
	int pipe_h_vp_start, int pipe_h_vp_end, int *first_offset, int *second_offset)
{ … }

/*
* For a given set of pipe start/end x positions, checks to see it can support the input mcache splitting.
* It also attempts to "optimize" by finding a shift if the default 0 shift does not work.
*/
static bool find_shift_for_valid_cache_id_assignment(int *mcache_boundaries, unsigned int num_boundaries,
	int *pipe_vp_startx, int *pipe_vp_endx, unsigned int pipe_count, int shift_granularity, int *shift)
{ … }

/*
* Counts the number of elements inside input array within the given span length.
* Formally, what is the size of the largest subset of the array where the largest and smallest element
* differ no more than the span.
*/
static unsigned int count_elements_in_span(int *array, unsigned int array_size, unsigned int span)
{ … }

static bool calculate_h_split_for_scaling_transform(int full_vp_width, int h_active, int num_pipes,
	enum dml2_scaling_transform scaling_transform, int *pipe_vp_x_start, int *pipe_vp_x_end)
{ … }

bool dml2_top_mcache_validate_admissability(struct top_mcache_validate_admissability_in_out *params)
{ … }

static void reset_mcache_allocations(struct dml2_hubp_pipe_mcache_regs *per_plane_pipe_mcache_regs)
{ … }

bool dml2_top_mcache_build_mcache_programming(struct dml2_build_mcache_programming_in_out *params)
{ … }

void dml2_top_mcache_assign_global_mcache_ids(struct top_mcache_assign_global_mcache_ids_in_out *params)
{ … }

bool dml2_top_mcache_calc_mcache_count_and_offsets(struct top_mcache_calc_mcache_count_and_offsets_in_out *params)
{ … }