drivers/gpu/drm/radeon/uvd_v4_2.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/radeon/uvd_v4_2.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/radeon/uvd_v4_2.c
Extension
.c
Size
2538 bytes
Lines
79
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 <linux/firmware.h>

#include "radeon.h"
#include "radeon_asic.h"
#include "cikd.h"

/**
 * uvd_v4_2_resume - memory controller programming
 *
 * @rdev: radeon_device pointer
 *
 * Let the UVD memory controller know it's offsets
 */
int uvd_v4_2_resume(struct radeon_device *rdev)
{
	uint64_t addr;
	uint32_t size;

	/* program the VCPU memory controller bits 0-27 */

	/* skip over the header of the new firmware format */
	if (rdev->uvd.fw_header_present)
		addr = (rdev->uvd.gpu_addr + 0x200) >> 3;
	else
		addr = rdev->uvd.gpu_addr >> 3;

	size = RADEON_GPU_PAGE_ALIGN(rdev->uvd_fw->size + 4) >> 3;
	WREG32(UVD_VCPU_CACHE_OFFSET0, addr);
	WREG32(UVD_VCPU_CACHE_SIZE0, size);

	addr += size;
	size = RADEON_UVD_HEAP_SIZE >> 3;
	WREG32(UVD_VCPU_CACHE_OFFSET1, addr);
	WREG32(UVD_VCPU_CACHE_SIZE1, size);

	addr += size;
	size = (RADEON_UVD_STACK_SIZE +
	       (RADEON_UVD_SESSION_SIZE * rdev->uvd.max_handles)) >> 3;
	WREG32(UVD_VCPU_CACHE_OFFSET2, addr);
	WREG32(UVD_VCPU_CACHE_SIZE2, size);

	/* bits 28-31 */
	addr = (rdev->uvd.gpu_addr >> 28) & 0xF;
	WREG32(UVD_LMI_ADDR_EXT, (addr << 12) | (addr << 0));

	/* bits 32-39 */
	addr = (rdev->uvd.gpu_addr >> 32) & 0xFF;
	WREG32(UVD_LMI_EXT40_ADDR, addr | (0x9 << 16) | (0x1 << 31));

	if (rdev->uvd.fw_header_present)
		WREG32(UVD_GP_SCRATCH4, rdev->uvd.max_handles);

	return 0;
}

Annotation

Implementation Notes