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drm/amd/pm/si: Notify the SMC when switching to AC

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There are some platforms that don't have a dedicated
GPIO line to manage the AC/DC switch. In this case,
the SI SMC automatically notices when switching to DC,
but needs to be notified when switching to AC.

Fixup and use si_notify_hw_of_powersource() which was
previously hidden behind an "#if 0".

This fixes some SI laptop GPUs to be able to use their
performance power states after switching from DC to AC.

Some affected GPUs are:
FirePro W4170M - Dell Precision M2800
Radeon HD 8790M - Dell Latitude E6540

Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Co-developed-by: Timur Kristóf <timur.kristof@gmail.com>
Signed-off-by: Timur Kristóf <timur.kristof@gmail.com>
Signed-off-by: Jeremy Klarenbeek <jeremy.klarenbeek99@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Jeremy Klarenbeek
2026-05-19 10:41:58 +02:00
committed by Alex Deucher
parent e6c5d36756
commit 2d071f6457
1 changed files with 10 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files

17
drivers/gpu/drm/amd/pm/legacy-dpm/si_dpm.c
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@@ -3888,16 +3888,18 @@ static void si_notify_hardware_vpu_recovery_event(struct amdgpu_device *adev)
}
#endif
#if 0
static int si_notify_hw_of_powersource(struct amdgpu_device *adev, bool ac_power)
static void si_notify_hw_of_powersource(void *handle)
{
if (ac_power)
return (amdgpu_si_send_msg_to_smc(adev, PPSMC_MSG_RunningOnAC) == PPSMC_Result_OK) ?
0 : -EINVAL;
struct amdgpu_device *adev = (struct amdgpu_device *)handle;
return 0;
/* Check if the platform already manages the AC/DC switch via dedicated GPIO. */
if (adev->pm.dpm.platform_caps & ATOM_PP_PLATFORM_CAP_HARDWAREDC)
return;
/* The SMU automatically notices DC, but needs to be notified when switching to AC. */
if (adev->pm.ac_power)
amdgpu_si_send_msg_to_smc(adev, PPSMC_MSG_RunningOnAC);
}
#endif
static PPSMC_Result si_send_msg_to_smc_with_parameter(struct amdgpu_device *adev,
PPSMC_Msg msg, u32 parameter)
@@ -8163,6 +8165,7 @@ static const struct amd_pm_funcs si_dpm_funcs = {
.get_vce_clock_state = amdgpu_get_vce_clock_state,
.read_sensor = &si_dpm_read_sensor,
.pm_compute_clocks = amdgpu_legacy_dpm_compute_clocks,
.notify_ac_dc = si_notify_hw_of_powersource,
};
static const struct amdgpu_irq_src_funcs si_dpm_irq_funcs = {