drivers/gpu/drm/amd/amdgpu/hdp_v5_0.c
Source file repositories/reference/linux-study-clean/drivers/gpu/drm/amd/amdgpu/hdp_v5_0.c
File Facts
- System
- Linux kernel
- Corpus path
drivers/gpu/drm/amd/amdgpu/hdp_v5_0.c- Extension
.c- Size
- 8135 bytes
- Lines
- 215
- 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.
- 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.
- Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.
Dependency Surface
amdgpu.hhdp_v5_0.hhdp/hdp_5_0_0_offset.hhdp/hdp_5_0_0_sh_mask.huapi/linux/kfd_ioctl.h
Detected Declarations
function filesfunction hdp_v5_0_update_mem_power_gatingfunction hdp_v5_0_update_medium_grain_clock_gatingfunction hdp_v5_0_update_clock_gatingfunction hdp_v5_0_get_clockgating_statefunction hdp_v5_0_init_registers
Annotated Snippet
if (adev->cg_flags & AMD_CG_SUPPORT_HDP_LS) {
hdp_mem_pwr_cntl = REG_SET_FIELD(hdp_mem_pwr_cntl,
HDP_MEM_POWER_CTRL,
IPH_MEM_POWER_LS_EN, 1);
hdp_mem_pwr_cntl = REG_SET_FIELD(hdp_mem_pwr_cntl,
HDP_MEM_POWER_CTRL,
RC_MEM_POWER_LS_EN, 1);
} else if (adev->cg_flags & AMD_CG_SUPPORT_HDP_DS) {
hdp_mem_pwr_cntl = REG_SET_FIELD(hdp_mem_pwr_cntl,
HDP_MEM_POWER_CTRL,
IPH_MEM_POWER_DS_EN, 1);
hdp_mem_pwr_cntl = REG_SET_FIELD(hdp_mem_pwr_cntl,
HDP_MEM_POWER_CTRL,
RC_MEM_POWER_DS_EN, 1);
} else if (adev->cg_flags & AMD_CG_SUPPORT_HDP_SD) {
hdp_mem_pwr_cntl = REG_SET_FIELD(hdp_mem_pwr_cntl,
HDP_MEM_POWER_CTRL,
IPH_MEM_POWER_SD_EN, 1);
/* RC should not use shut down mode, fallback to ds or ls if allowed */
if (adev->cg_flags & AMD_CG_SUPPORT_HDP_DS)
hdp_mem_pwr_cntl = REG_SET_FIELD(hdp_mem_pwr_cntl,
HDP_MEM_POWER_CTRL,
RC_MEM_POWER_DS_EN, 1);
else if (adev->cg_flags & AMD_CG_SUPPORT_HDP_LS)
hdp_mem_pwr_cntl = REG_SET_FIELD(hdp_mem_pwr_cntl,
HDP_MEM_POWER_CTRL,
RC_MEM_POWER_LS_EN, 1);
}
/* confirmed that IPH_MEM_POWER_CTRL_EN and RC_MEM_POWER_CTRL_EN have to
* be set for SRAM LS/DS/SD */
if (adev->cg_flags & (AMD_CG_SUPPORT_HDP_LS | AMD_CG_SUPPORT_HDP_DS |
AMD_CG_SUPPORT_HDP_SD)) {
hdp_mem_pwr_cntl = REG_SET_FIELD(hdp_mem_pwr_cntl, HDP_MEM_POWER_CTRL,
IPH_MEM_POWER_CTRL_EN, 1);
hdp_mem_pwr_cntl = REG_SET_FIELD(hdp_mem_pwr_cntl, HDP_MEM_POWER_CTRL,
RC_MEM_POWER_CTRL_EN, 1);
WREG32_SOC15(HDP, 0, mmHDP_MEM_POWER_CTRL, hdp_mem_pwr_cntl);
}
}
/* disable IPH & RC clock override after clock/power mode changing */
hdp_clk_cntl = REG_SET_FIELD(hdp_clk_cntl, HDP_CLK_CNTL,
IPH_MEM_CLK_SOFT_OVERRIDE, 0);
hdp_clk_cntl = REG_SET_FIELD(hdp_clk_cntl, HDP_CLK_CNTL,
RC_MEM_CLK_SOFT_OVERRIDE, 0);
WREG32_SOC15(HDP, 0, mmHDP_CLK_CNTL, hdp_clk_cntl);
}
static void hdp_v5_0_update_medium_grain_clock_gating(struct amdgpu_device *adev,
bool enable)
{
uint32_t hdp_clk_cntl;
if (!(adev->cg_flags & AMD_CG_SUPPORT_HDP_MGCG))
return;
hdp_clk_cntl = RREG32_SOC15(HDP, 0, mmHDP_CLK_CNTL);
if (enable) {
hdp_clk_cntl &=
~(uint32_t)
(HDP_CLK_CNTL__IPH_MEM_CLK_SOFT_OVERRIDE_MASK |
HDP_CLK_CNTL__RC_MEM_CLK_SOFT_OVERRIDE_MASK |
HDP_CLK_CNTL__DBUS_CLK_SOFT_OVERRIDE_MASK |
HDP_CLK_CNTL__DYN_CLK_SOFT_OVERRIDE_MASK |
HDP_CLK_CNTL__XDP_REG_CLK_SOFT_OVERRIDE_MASK |
HDP_CLK_CNTL__HDP_REG_CLK_SOFT_OVERRIDE_MASK);
} else {
hdp_clk_cntl |= HDP_CLK_CNTL__IPH_MEM_CLK_SOFT_OVERRIDE_MASK |
HDP_CLK_CNTL__RC_MEM_CLK_SOFT_OVERRIDE_MASK |
HDP_CLK_CNTL__DBUS_CLK_SOFT_OVERRIDE_MASK |
HDP_CLK_CNTL__DYN_CLK_SOFT_OVERRIDE_MASK |
HDP_CLK_CNTL__XDP_REG_CLK_SOFT_OVERRIDE_MASK |
HDP_CLK_CNTL__HDP_REG_CLK_SOFT_OVERRIDE_MASK;
}
WREG32_SOC15(HDP, 0, mmHDP_CLK_CNTL, hdp_clk_cntl);
}
static void hdp_v5_0_update_clock_gating(struct amdgpu_device *adev,
bool enable)
{
hdp_v5_0_update_mem_power_gating(adev, enable);
hdp_v5_0_update_medium_grain_clock_gating(adev, enable);
}
static void hdp_v5_0_get_clockgating_state(struct amdgpu_device *adev,
u64 *flags)
{
Annotation
- Immediate include surface: `amdgpu.h`, `hdp_v5_0.h`, `hdp/hdp_5_0_0_offset.h`, `hdp/hdp_5_0_0_sh_mask.h`, `uapi/linux/kfd_ioctl.h`.
- Detected declarations: `function files`, `function hdp_v5_0_update_mem_power_gating`, `function hdp_v5_0_update_medium_grain_clock_gating`, `function hdp_v5_0_update_clock_gating`, `function hdp_v5_0_get_clockgating_state`, `function hdp_v5_0_init_registers`.
- Atlas domain: Driver Families / drivers/gpu.
- Implementation status: source implementation candidate.
Implementation Notes
- This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
- Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
- Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.