drivers/gpu/drm/amd/display/dc/dml/calcs/dcn_calc_math.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/amd/display/dc/dml/calcs/dcn_calc_math.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/amd/display/dc/dml/calcs/dcn_calc_math.c
Extension
.c
Size
3662 bytes
Lines
146
Domain
Driver Families
Bucket
drivers/gpu
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

#include "os_types.h"
#include "dcn_calc_math.h"

#define isNaN(number) ((number) != (number))

/*
 * NOTE:
 *   This file is gcc-parseable HW gospel, coming straight from HW engineers.
 *
 * It doesn't adhere to Linux kernel style and sometimes will do things in odd
 * ways. Unless there is something clearly wrong with it the code should
 * remain as-is as it provides us with a guarantee from HW that it is correct.
 */

float dcn_bw_mod(const float arg1, const float arg2)
{
	if (isNaN(arg1))
		return arg2;
	if (isNaN(arg2))
		return arg1;
	return arg1 - arg1 * ((int) (arg1 / arg2));
}

float dcn_bw_min2(const float arg1, const float arg2)
{
	if (isNaN(arg1))
		return arg2;
	if (isNaN(arg2))
		return arg1;
	return arg1 < arg2 ? arg1 : arg2;
}

unsigned int dcn_bw_max(const unsigned int arg1, const unsigned int arg2)
{
	return arg1 > arg2 ? arg1 : arg2;
}
float dcn_bw_max2(const float arg1, const float arg2)
{
	if (isNaN(arg1))
		return arg2;
	if (isNaN(arg2))
		return arg1;
	return arg1 > arg2 ? arg1 : arg2;
}

float dcn_bw_floor2(const float arg, const float significance)
{
	ASSERT(significance != 0);

	return ((int) (arg / significance)) * significance;
}
float dcn_bw_floor(const float arg)
{
	return (float)((int)(arg));
}

float dcn_bw_ceil(const float arg)
{
	return (float)((int)(arg + 0.99999f));
}

float dcn_bw_ceil2(const float arg, const float significance)
{
	ASSERT(significance != 0);

	return ((int) (arg / significance + 0.99999)) * significance;
}

float dcn_bw_max3(float v1, float v2, float v3)
{
	return v3 > dcn_bw_max2(v1, v2) ? v3 : dcn_bw_max2(v1, v2);
}

float dcn_bw_max5(float v1, float v2, float v3, float v4, float v5)
{
	return dcn_bw_max3(v1, v2, v3) > dcn_bw_max2(v4, v5) ? dcn_bw_max3(v1, v2, v3) : dcn_bw_max2(v4, v5);
}

float dcn_bw_pow(float a, float exp)
{
	float temp;
	/*ASSERT(exp == (int)exp);*/
	if ((int)exp == 0)
		return 1;
	temp = dcn_bw_pow(a, (float)((int)(exp / 2)));
	if (((int)exp % 2) == 0) {
		return temp * temp;
	} else {
		if ((int)exp > 0)
			return a * temp * temp;

Annotation

Implementation Notes