On Thu, 16 Jun 2022, Anshuman Gupta wrote:
> DGFX cards support both Add in Card(AIC) and Mother Board Down(MBD)
> configs. MBD config requires HOST BIOS GPIO toggling support
> in order to enable/disable VRAM SR using ACPI OpRegion.
>
> i915 requires to check OpRegion PCON MBD Config bits to
> discover whether Gfx Card is MBD config before enabling
> VRSR.
>
> BSpec: 53440
> Cc: Jani Nikula
> Cc: Rodrigo Vivi
> Signed-off-by: Anshuman Gupta
> ---
> drivers/gpu/drm/i915/display/intel_opregion.c | 43 +++
> drivers/gpu/drm/i915/display/intel_opregion.h | 6 +++
> 2 files changed, 49 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_opregion.c
> b/drivers/gpu/drm/i915/display/intel_opregion.c
> index 11d8c5bb23ac..c8cdcde89dfc 100644
> --- a/drivers/gpu/drm/i915/display/intel_opregion.c
> +++ b/drivers/gpu/drm/i915/display/intel_opregion.c
> @@ -53,6 +53,8 @@
> #define MBOX_ASLE_EXTBIT(4) /* Mailbox #5 */
> #define MBOX_BACKLIGHT BIT(5) /* Mailbox #2 (valid from v3.x)
> */
>
> +#define PCON_DG1_MBD_CONFIG BIT(9)
> +#define PCON_DG1_MBD_CONFIG_FIELD_VALID BIT(10)
> #define PCON_DGFX_BIOS_SUPPORTS_VRSR BIT(11)
> #define PCON_DGFX_BIOS_SUPPORTS_VRSR_FIELD_VALID BIT(12)
> #define PCON_HEADLESS_SKUBIT(13)
> @@ -1255,6 +1257,44 @@ void intel_opregion_unregister(struct drm_i915_private
> *i915)
> opregion->lid_state = NULL;
> }
>
> +static bool intel_opregion_dg1_mbd_config(struct drm_i915_private *i915)
> +{
> + struct intel_opregion *opregion = >opregion;
> +
> + if (!IS_DG1(i915))
> + return false;
> +
> + if (!opregion)
Like in previous patch, opregion is always non-NULL. Check for
!opregion->header.
> + return false;
> +
> + if (opregion->header->pcon & PCON_DG1_MBD_CONFIG_FIELD_VALID)
> + return opregion->header->pcon & PCON_DG1_MBD_CONFIG;
> + else
> + return false;
> +}
> +
> +/**
> + * intel_opregion_vram_sr_required().
> + * @i915 i915 device priv data.
> + *
> + * It checks whether a DGFX card is Mother Board Down config depending
> + * on respective discrete platform.
> + *
> + * Returns:
> + * It returns a boolean whether opregion vram_sr support is required.
> + */
> +bool
> +intel_opregion_vram_sr_required(struct drm_i915_private *i915)
> +{
> + if (!IS_DGFX(i915))
> + return false;
> +
> + if (IS_DG1(i915))
> + return intel_opregion_dg1_mbd_config(i915);
Only check for IS_DG1() here or in the function being called, not both.
> +
> + return false;
> +}
> +
> /**
> * intel_opregion_bios_supports_vram_sr() get HOST BIOS VRAM Self
> * Refresh capability support.
> @@ -1298,6 +1338,9 @@ void intel_opregion_vram_sr(struct drm_i915_private
> *i915, bool enable)
> if (!opregion)
> return;
>
> + if (!intel_opregion_vram_sr_required(i915))
> + return;
Feels like maybe this patch should be combined with the previous patch
due to this dependency.
> +
> if (drm_WARN(>drm, !opregion->asle, "ASLE MAILBOX3 is not
> available\n"))
> return;
>
> diff --git a/drivers/gpu/drm/i915/display/intel_opregion.h
> b/drivers/gpu/drm/i915/display/intel_opregion.h
> index 73c9d81d5ee6..ad40c97f9565 100644
> --- a/drivers/gpu/drm/i915/display/intel_opregion.h
> +++ b/drivers/gpu/drm/i915/display/intel_opregion.h
> @@ -77,6 +77,7 @@ int intel_opregion_get_panel_type(struct drm_i915_private
> *dev_priv);
> struct edid *intel_opregion_get_edid(struct intel_connector *connector);
> bool intel_opregion_bios_supports_vram_sr(struct drm_i915_private *i915);
> void intel_opregion_vram_sr(struct drm_i915_private *i915, bool enable);
> +bool intel_opregion_vram_sr_required(struct drm_i915_private *i915);
>
> bool intel_opregion_headless_sku(struct drm_i915_private *i915);
>
> @@ -145,6 +146,11 @@ static void intel_opregion_vram_sr(struct
> drm_i915_private *i915, bool enable)
> {
> }
>
> +static bool intel_opregion_vram_sr_required(struct drm_i915_private *i915)
static inline.
BR,
Jani.
> +{
> + return false;
> +}
> +
> #endif /* CONFIG_ACPI */
>
> #endif
--
Jani Nikula, Intel Open Source Graphics Center
