[RFC 4/6] drm/xe/vrsr: Refactor d3cold.allowed to a enum

[Rodrigo Vivi]

On Mon, Feb 24, 2025 at 10:18:47PM +0530, Anshuman Gupta wrote:
> Add xe_d3_state enum to add support for VRAM Self Refresh
> d3cold state.
> 
> Signed-off-by: Anshuman Gupta <anshuman.gupta at intel.com>
> ---
>  drivers/gpu/drm/xe/xe_device_types.h | 5 +++--
>  drivers/gpu/drm/xe/xe_pm.c           | 6 +++---
>  drivers/gpu/drm/xe/xe_pm.h           | 6 ++++++
>  3 files changed, 12 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/xe/xe_device_types.h b/drivers/gpu/drm/xe/xe_device_types.h
> index da7946b75cd5..937461939ecc 100644
> --- a/drivers/gpu/drm/xe/xe_device_types.h
> +++ b/drivers/gpu/drm/xe/xe_device_types.h
> @@ -19,6 +19,7 @@
>  #include "xe_memirq_types.h"
>  #include "xe_oa_types.h"
>  #include "xe_platform_types.h"
> +#include "xe_pm.h"
>  #include "xe_pmu_types.h"
>  #include "xe_pt_types.h"
>  #include "xe_sriov_types.h"
> @@ -488,8 +489,8 @@ struct xe_device {
>  		/** @d3cold.capable: Indicates if root port is d3cold capable */
>  		bool capable;
>  
> -		/** @d3cold.allowed: Indicates if d3cold is a valid device state */
> -		bool allowed;
> +		/** @d3cold.allowed: Indicates d3cold target state */
> +		enum xe_d3_state allowed;

let's also rename the variable name to 'target_state'

or xe->d3cold.allowed = XE_D3HOT //becomes strange

xe->d3.target_state = XE_D3HOT sounds better imho

>  
>  		/** @d3cold.vrsr_capable: Indicates if d3cold VRAM Self Refresh is supported */
>  		bool vrsr_capable;
> diff --git a/drivers/gpu/drm/xe/xe_pm.c b/drivers/gpu/drm/xe/xe_pm.c
> index 32583651988f..81e67b5693dc 100644
> --- a/drivers/gpu/drm/xe/xe_pm.c
> +++ b/drivers/gpu/drm/xe/xe_pm.c
> @@ -859,7 +859,7 @@ void xe_pm_d3cold_allowed_toggle(struct xe_device *xe)
>  	int i;
>  
>  	if (!xe->d3cold.capable) {
> -		xe->d3cold.allowed = false;
> +		xe->d3cold.allowed = XE_D3HOT;
>  		return;
>  	}
>  
> @@ -874,9 +874,9 @@ void xe_pm_d3cold_allowed_toggle(struct xe_device *xe)
>  	mutex_lock(&xe->d3cold.lock);
>  
>  	if (total_vram_used_mb < xe->d3cold.vram_threshold)
> -		xe->d3cold.allowed = true;
> +		xe->d3cold.allowed = XE_D3COLD_OFF;
>  	else
> -		xe->d3cold.allowed = false;
> +		xe->d3cold.allowed = XE_D3HOT;
>  
>  	mutex_unlock(&xe->d3cold.lock);
>  }
> diff --git a/drivers/gpu/drm/xe/xe_pm.h b/drivers/gpu/drm/xe/xe_pm.h
> index c9f176912b46..b7b74757ce21 100644
> --- a/drivers/gpu/drm/xe/xe_pm.h
> +++ b/drivers/gpu/drm/xe/xe_pm.h
> @@ -12,6 +12,12 @@
>  
>  struct xe_device;
>  
> +enum xe_d3_state {
> +	XE_D3HOT = 0,
> +	XE_D3COLD_OFF,
> +	XE_D3COLD_VRSR,
> +};
> +
>  int xe_pm_suspend(struct xe_device *xe);
>  int xe_pm_resume(struct xe_device *xe);
>  
> -- 
> 2.34.1
>