[PATCH] drm/amdgpu/pm: Fix the power source flag error

[Ma, Jun]

Hi Lijo,

On 1/17/2024 5:41 PM, Lazar, Lijo wrote:
> On 1/17/2024 2:22 PM, Ma Jun wrote:
>> The power source flag should be updated when
>> [1] System receives an interrupt indicating that the power source
>> has changed.
>> [2] System resumes from suspend or runtime suspend
>>
>> Signed-off-by: Ma Jun <Jun.Ma2 at amd.com>
>> ---
>>   drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c     | 24 +++++++++++--------
>>   .../gpu/drm/amd/pm/swsmu/smu11/smu_v11_0.c    |  2 ++
>>   .../gpu/drm/amd/pm/swsmu/smu13/smu_v13_0.c    |  2 ++
>>   3 files changed, 18 insertions(+), 10 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c b/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
>> index c16703868e5c..e16d22e30a8a 100644
>> --- a/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
>> +++ b/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
>> @@ -24,6 +24,7 @@
>>   
>>   #include <linux/firmware.h>
>>   #include <linux/pci.h>
>> +#include <linux/power_supply.h>
>>   #include <linux/reboot.h>
>>   
>>   #include "amdgpu.h"
>> @@ -793,6 +794,17 @@ static int smu_apply_default_config_table_settings(struct smu_context *smu)
>>   	return smu_set_config_table(smu, &adev->pm.config_table);
>>   }
>>   
>> +static void smu_update_power_source(struct amdgpu_device *adev)
>> +{
>> +	if (power_supply_is_system_supplied() > 0)
>> +		adev->pm.ac_power = true;
>> +	else
>> +		adev->pm.ac_power = false;
>> +
>> +	if (is_support_sw_smu(adev))
>> +		smu_set_ac_dc(adev->powerplay.pp_handle);
>> +}
>> +
>>   static int smu_late_init(void *handle)
>>   {
>>   	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
>> @@ -817,16 +829,8 @@ static int smu_late_init(void *handle)
>>   	 * handle the switch automatically. Driver involvement
>>   	 * is unnecessary.
>>   	 */
>> -	if (!smu->dc_controlled_by_gpio) {
>> -		ret = smu_set_power_source(smu,
>> -					   adev->pm.ac_power ? SMU_POWER_SOURCE_AC :
>> -					   SMU_POWER_SOURCE_DC);
>> -		if (ret) {
>> -			dev_err(adev->dev, "Failed to switch to %s mode!\n",
>> -				adev->pm.ac_power ? "AC" : "DC");
>> -			return ret;
>> -		}
>> -	}
> 
> For this part of the change - driver already updates FW with the initial 
> detected power state or the last detected power state before going for 
> suspend. Isn't that good enough?
> 

The power source may change during system suspend, so it's necessary to detect the
power source again before system reads the power related data, such as max_power_limit.

Regards,
Ma Jun


> Thanks,
> Lijo
> 
>> +	if (!smu->dc_controlled_by_gpio)
>> +		smu_update_power_source(adev);
>>   
>>   	if ((amdgpu_ip_version(adev, MP1_HWIP, 0) == IP_VERSION(13, 0, 1)) ||
>>   	    (amdgpu_ip_version(adev, MP1_HWIP, 0) == IP_VERSION(13, 0, 3)))
>> diff --git a/drivers/gpu/drm/amd/pm/swsmu/smu11/smu_v11_0.c b/drivers/gpu/drm/amd/pm/swsmu/smu11/smu_v11_0.c
>> index 2e7f8d5cfc28..8047150fddd4 100644
>> --- a/drivers/gpu/drm/amd/pm/swsmu/smu11/smu_v11_0.c
>> +++ b/drivers/gpu/drm/amd/pm/swsmu/smu11/smu_v11_0.c
>> @@ -1442,10 +1442,12 @@ static int smu_v11_0_irq_process(struct amdgpu_device *adev,
>>   			case 0x3:
>>   				dev_dbg(adev->dev, "Switched to AC mode!\n");
>>   				schedule_work(&smu->interrupt_work);
>> +				adev->pm.ac_power = true;
>>   				break;
>>   			case 0x4:
>>   				dev_dbg(adev->dev, "Switched to DC mode!\n");
>>   				schedule_work(&smu->interrupt_work);
>> +				adev->pm.ac_power = false;
>>   				break;
>>   			case 0x7:
>>   				/*
>> diff --git a/drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0.c b/drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0.c
>> index 771a3d457c33..c486182ff275 100644
>> --- a/drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0.c
>> +++ b/drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0.c
>> @@ -1379,10 +1379,12 @@ static int smu_v13_0_irq_process(struct amdgpu_device *adev,
>>   			case 0x3:
>>   				dev_dbg(adev->dev, "Switched to AC mode!\n");
>>   				smu_v13_0_ack_ac_dc_interrupt(smu);
>> +				adev->pm.ac_power = true;
>>   				break;
>>   			case 0x4:
>>   				dev_dbg(adev->dev, "Switched to DC mode!\n");
>>   				smu_v13_0_ack_ac_dc_interrupt(smu);
>> +				adev->pm.ac_power = false;
>>   				break;
>>   			case 0x7:
>>   				/*
>