forked from Minki/linux
3bace35914
The hwmgr handles all hardware related calls, including clock/power gating control, DPM, read and parse PPTable, etc. v5: squash in fixes v4: implement acpi's atcs function use cgs interface v3: fix code style error and add big-endian mode support. v2: use cgs interface directly in hwmgr sub-module Signed-off-by: Rex Zhu <Rex.Zhu@amd.com> Signed-off-by: Jammy Zhou <Jammy.Zhou@amd.com> Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
77 lines
1.9 KiB
C
77 lines
1.9 KiB
C
#include <linux/errno.h>
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#include "linux/delay.h"
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#include "hwmgr.h"
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#include "amd_acpi.h"
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bool acpi_atcs_functions_supported(void *device, uint32_t index)
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{
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int32_t result;
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struct atcs_verify_interface output_buf = {0};
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int32_t temp_buffer = 1;
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result = cgs_call_acpi_method(device, CGS_ACPI_METHOD_ATCS,
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ATCS_FUNCTION_VERIFY_INTERFACE,
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&temp_buffer,
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&output_buf,
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1,
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sizeof(temp_buffer),
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sizeof(output_buf));
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return result == 0 ? (output_buf.function_bits & (1 << (index - 1))) != 0 : false;
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}
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int acpi_pcie_perf_request(void *device, uint8_t perf_req, bool advertise)
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{
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struct atcs_pref_req_input atcs_input;
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struct atcs_pref_req_output atcs_output;
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u32 retry = 3;
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int result;
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struct cgs_system_info info = {0};
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if (!acpi_atcs_functions_supported(device, ATCS_FUNCTION_PCIE_PERFORMANCE_REQUEST))
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return -EINVAL;
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info.size = sizeof(struct cgs_system_info);
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info.info_id = CGS_SYSTEM_INFO_ADAPTER_BDF_ID;
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result = cgs_query_system_info(device, &info);
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if (result != 0)
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return -EINVAL;
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atcs_input.client_id = (uint16_t)info.value;
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atcs_input.size = sizeof(struct atcs_pref_req_input);
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atcs_input.valid_flags_mask = ATCS_VALID_FLAGS_MASK;
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atcs_input.flags = ATCS_WAIT_FOR_COMPLETION;
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if (advertise)
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atcs_input.flags |= ATCS_ADVERTISE_CAPS;
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atcs_input.req_type = ATCS_PCIE_LINK_SPEED;
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atcs_input.perf_req = perf_req;
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atcs_output.size = sizeof(struct atcs_pref_req_input);
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while (retry--) {
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result = cgs_call_acpi_method(device,
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CGS_ACPI_METHOD_ATCS,
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ATCS_FUNCTION_PCIE_PERFORMANCE_REQUEST,
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&atcs_input,
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&atcs_output,
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0,
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sizeof(atcs_input),
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sizeof(atcs_output));
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if (result != 0)
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return -EIO;
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switch (atcs_output.ret_val) {
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case ATCS_REQUEST_REFUSED:
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default:
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return -EINVAL;
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case ATCS_REQUEST_COMPLETE:
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return 0;
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case ATCS_REQUEST_IN_PROGRESS:
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udelay(10);
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break;
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}
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}
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return 0;
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}
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