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drm/amd/pm/si: Fix AC/DC switch notification

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There were two mistakes in the previous implementation:

The check for ATOM_PP_PLATFORM_CAP_HARDWAREDC should be
inverted. We recently learned that the kernel should send
PPSMC_MSG_RunningOnAC when the flag is set, and not the
other way around.

The clocks also need to be recomputed, because the code in
the si_apply_state_adjust_rules() function selects different
limits on AC and DC.

Fixes: 2d071f6457 ("drm/amd/pm/si: Notify the SMC when switching to AC")
Tested-by: Jeremy Klarenbeek <jeremy.klarenbeek99@gmail.com>
Signed-off-by: Timur Kristóf <timur.kristof@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 358dd0a9ce)
Cc: stable@vger.kernel.org
This commit is contained in:
Timur Kristóf
2026-07-17 17:40:16 -04:00
committed by Alex Deucher
parent f8922d5a94
commit 86b6cf8387
1 changed files with 9 additions and 6 deletions
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drivers/gpu/drm/amd/pm/legacy-dpm/si_dpm.c
+9 -6
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@@ -3892,13 +3892,16 @@ static void si_notify_hw_of_powersource(void *handle)
{
struct amdgpu_device *adev = (struct amdgpu_device *)handle;
/* 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)
/*
* Check if the platform already manages the AC/DC switch via dedicated GPIO.
* Otherwise SMU automatically notices DC, but needs to be notified of AC.
*/
if (adev->pm.ac_power &&
(adev->pm.dpm.platform_caps & ATOM_PP_PLATFORM_CAP_HARDWAREDC))
amdgpu_si_send_msg_to_smc(adev, PPSMC_MSG_RunningOnAC);
/* Recompute clocks with updated max_limits. */
amdgpu_legacy_dpm_compute_clocks(adev);
}
static PPSMC_Result si_send_msg_to_smc_with_parameter(struct amdgpu_device *adev,