drivers/gpu/drm/amd/display/dmub/src/dmub_dcn30.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/amd/display/dmub/src/dmub_dcn30.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/amd/display/dmub/src/dmub_dcn30.c
Extension
.c
Size
6734 bytes
Lines
204
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 "../dmub_srv.h"
#include "dmub_reg.h"
#include "dmub_dcn20.h"
#include "dmub_dcn30.h"

#include "sienna_cichlid_ip_offset.h"
#include "dcn/dcn_3_0_0_offset.h"
#include "dcn/dcn_3_0_0_sh_mask.h"

#define BASE_INNER(seg) DCN_BASE__INST0_SEG##seg
#define CTX dmub
#define REGS dmub->regs

/* Registers. */

const struct dmub_srv_common_regs dmub_srv_dcn30_regs = {
#define DMUB_SR(reg) REG_OFFSET(reg),
	{
		DMUB_COMMON_REGS()
		DMCUB_INTERNAL_REGS()
	},
#undef DMUB_SR

#define DMUB_SF(reg, field) FD_MASK(reg, field),
	{ DMUB_COMMON_FIELDS() },
#undef DMUB_SF

#define DMUB_SF(reg, field) FD_SHIFT(reg, field),
	{ DMUB_COMMON_FIELDS() },
#undef DMUB_SF
};

/* Shared functions. */

static void dmub_dcn30_get_fb_base_offset(struct dmub_srv *dmub,
					  uint64_t *fb_base,
					  uint64_t *fb_offset)
{
	uint32_t tmp;

	if (dmub->soc_fb_info.fb_base || dmub->soc_fb_info.fb_offset) {
		*fb_base = dmub->soc_fb_info.fb_base;
		*fb_offset = dmub->soc_fb_info.fb_offset;
		return;
	}

	REG_GET(DCN_VM_FB_LOCATION_BASE, FB_BASE, &tmp);
	*fb_base = (uint64_t)tmp << 24;

	REG_GET(DCN_VM_FB_OFFSET, FB_OFFSET, &tmp);
	*fb_offset = (uint64_t)tmp << 24;
}

static inline void dmub_dcn30_translate_addr(const union dmub_addr *addr_in,
					     uint64_t fb_base,
					     uint64_t fb_offset,
					     union dmub_addr *addr_out)
{
	addr_out->quad_part = addr_in->quad_part - fb_base + fb_offset;
}

void dmub_dcn30_backdoor_load(struct dmub_srv *dmub,
			      const struct dmub_window *cw0,
			      const struct dmub_window *cw1)
{
	union dmub_addr offset;
	uint64_t fb_base, fb_offset;

	dmub_dcn30_get_fb_base_offset(dmub, &fb_base, &fb_offset);

	REG_UPDATE(DMCUB_SEC_CNTL, DMCUB_SEC_RESET, 1);

	/* MEM_CTNL read/write space doesn't exist. */

	dmub_dcn30_translate_addr(&cw0->offset, fb_base, fb_offset, &offset);

	REG_WRITE(DMCUB_REGION3_CW0_OFFSET, offset.u.low_part);
	REG_WRITE(DMCUB_REGION3_CW0_OFFSET_HIGH, offset.u.high_part);
	REG_WRITE(DMCUB_REGION3_CW0_BASE_ADDRESS, cw0->region.base);
	REG_SET_2(DMCUB_REGION3_CW0_TOP_ADDRESS, 0,
		  DMCUB_REGION3_CW0_TOP_ADDRESS, cw0->region.top,
		  DMCUB_REGION3_CW0_ENABLE, 1);

	dmub_dcn30_translate_addr(&cw1->offset, fb_base, fb_offset, &offset);

	REG_WRITE(DMCUB_REGION3_CW1_OFFSET, offset.u.low_part);
	REG_WRITE(DMCUB_REGION3_CW1_OFFSET_HIGH, offset.u.high_part);
	REG_WRITE(DMCUB_REGION3_CW1_BASE_ADDRESS, cw1->region.base);
	REG_SET_2(DMCUB_REGION3_CW1_TOP_ADDRESS, 0,
		  DMCUB_REGION3_CW1_TOP_ADDRESS, cw1->region.top,

Annotation

Implementation Notes