[PATCH V2 2/7] drm/amd/pm: record the RPM and PWM based fan speed settings

[Lazar, Lijo]

On 8/12/2021 9:31 AM, Evan Quan wrote:
> As the relationship "PWM = RPM / smu->fan_max_rpm" between fan speed
> PWM and RPM is not true for SMU11 ASICs. So, both the RPM and PWM
> settings need to be saved.
> 
> Change-Id: I318c134d442273d518b805339cdf383e151b935d
> Signed-off-by: Evan Quan <evan.quan at amd.com>
> --
> v1->v2:
>    - coding style and logging prints optimization (Guchun)
>    - reuse existing flags (Lijo)
> ---
>   drivers/gpu/drm/amd/pm/inc/amdgpu_smu.h   |  3 +++
>   drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c | 22 ++++++++++++++++------
>   2 files changed, 19 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/gpu/drm/amd/pm/inc/amdgpu_smu.h b/drivers/gpu/drm/amd/pm/inc/amdgpu_smu.h
> index 183654f8b564..29934a5af44e 100644
> --- a/drivers/gpu/drm/amd/pm/inc/amdgpu_smu.h
> +++ b/drivers/gpu/drm/amd/pm/inc/amdgpu_smu.h
> @@ -34,6 +34,8 @@
>   #define SMU_FW_NAME_LEN			0x24
>   
>   #define SMU_DPM_USER_PROFILE_RESTORE (1 << 0)
> +#define SMU_CUSTOM_FAN_SPEED_RPM     (1 << 1)
> +#define SMU_CUSTOM_FAN_SPEED_PWM     (1 << 2)
>   
>   // Power Throttlers
>   #define SMU_THROTTLER_PPT0_BIT			0
> @@ -230,6 +232,7 @@ struct smu_user_dpm_profile {
>   	uint32_t fan_mode;
>   	uint32_t power_limit;
>   	uint32_t fan_speed_percent;
> +	uint32_t fan_speed_rpm;
>   	uint32_t flags;
>   	uint32_t user_od;
>   
> diff --git a/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c b/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
> index e33e67310030..131ad0dfefbe 100644
> --- a/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
> +++ b/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
> @@ -413,7 +413,13 @@ static void smu_restore_dpm_user_profile(struct smu_context *smu)
>   		if (!ret && smu->user_dpm_profile.fan_speed_percent) {
>   			ret = smu_set_fan_speed_percent(smu, smu->user_dpm_profile.fan_speed_percent);
>   			if (ret)
> -				dev_err(smu->adev->dev, "Failed to set manual fan speed\n");
> +				dev_err(smu->adev->dev, "Failed to set manual fan speed in percent\n");
> +		}
> +
> +		if (!ret && smu->user_dpm_profile.fan_speed_rpm) {
> +			ret = smu_set_fan_speed_rpm(smu, smu->user_dpm_profile.fan_speed_rpm);
> +			if (ret)
> +				dev_err(smu->adev->dev, "Failed to set manual fan speed in rpm\n");
>   		}
>   	}
>   
> @@ -2179,7 +2185,6 @@ static int smu_set_gfx_cgpg(struct smu_context *smu, bool enabled)
>   static int smu_set_fan_speed_rpm(void *handle, uint32_t speed)
>   {
>   	struct smu_context *smu = handle;
> -	u32 percent;
>   	int ret = 0;
>   
>   	if (!smu->pm_enabled || !smu->adev->pm.dpm_enabled)
> @@ -2190,8 +2195,8 @@ static int smu_set_fan_speed_rpm(void *handle, uint32_t speed)
>   	if (smu->ppt_funcs->set_fan_speed_rpm) {
>   		ret = smu->ppt_funcs->set_fan_speed_rpm(smu, speed);
>   		if (!ret && smu->user_dpm_profile.flags & SMU_DPM_USER_PROFILE_RESTORE) {
> -			percent = speed * 100 / smu->fan_max_rpm;
> -			smu->user_dpm_profile.fan_speed_percent = percent;
> +			smu->user_dpm_profile.flags |= SMU_CUSTOM_FAN_SPEED_RPM;
> +			smu->user_dpm_profile.fan_speed_rpm = speed;

Sorry, missed this when you posted v1. Either RPM or PWM mode is allowed 
at a time, is that right? If so, shall we make the pwm to 0 and reset 
PWM flag when RPM is set and vice versa? This helps during restore where 
one is not overwritten with the other.

Thanks,
Lijo

>   		}
>   	}
>   
> @@ -2552,8 +2557,11 @@ static int smu_set_fan_control_mode(struct smu_context *smu, int value)
>   
>   	/* reset user dpm fan speed */
>   	if (!ret && value != AMD_FAN_CTRL_MANUAL &&
> -			!(smu->user_dpm_profile.flags & SMU_DPM_USER_PROFILE_RESTORE))
> +			!(smu->user_dpm_profile.flags & SMU_DPM_USER_PROFILE_RESTORE)) {
>   		smu->user_dpm_profile.fan_speed_percent = 0;
> +		smu->user_dpm_profile.fan_speed_rpm = 0;
> +		smu->user_dpm_profile.flags &= ~(SMU_CUSTOM_FAN_SPEED_RPM | SMU_CUSTOM_FAN_SPEED_PWM);
> +	}
>   
>   	return ret;
>   }
> @@ -2604,8 +2612,10 @@ static int smu_set_fan_speed_percent(void *handle, u32 speed)
>   		if (speed > 100)
>   			speed = 100;
>   		ret = smu->ppt_funcs->set_fan_speed_percent(smu, speed);
> -		if (!ret && !(smu->user_dpm_profile.flags & SMU_DPM_USER_PROFILE_RESTORE))
> +		if (!ret && !(smu->user_dpm_profile.flags & SMU_DPM_USER_PROFILE_RESTORE)) {
> +			smu->user_dpm_profile.flags |= SMU_CUSTOM_FAN_SPEED_PWM;
>   			smu->user_dpm_profile.fan_speed_percent = speed;
> +		}
>   	}
>   
>   	mutex_unlock(&smu->mutex);
>