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drm/i915/opregion: add function to check if headless sku

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Export headless sku bit (bit 13) from opregion->header->pcon as an
interface to check if our device is headless configuration.

This is mainly targeted for hybrid gfx systems. E.g. when display
is not supposed to be connected discrete graphics card it's
opregion can inform this is headless graphics card.

v3: Dummy version is now static inline function
v2: Check also opregion version

Bspec: 53441
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Jouni Högander <jouni.hogander@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220610085429.52935-2-jouni.hogander@intel.com
This commit is contained in:
Jouni Högander 2022-06-10 11:54:27 +03:00 committed by Jani Nikula
parent 8d2ba05b09
commit eb2983c09f
2 changed files with 21 additions and 0 deletions
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14
drivers/gpu/drm/i915/display/intel_opregion.c
View file

@ -53,6 +53,8 @@
#define MBOX_ASLE_EXT BIT(4) /* Mailbox #5 */
#define MBOX_BACKLIGHT BIT(5) /* Mailbox #2 (valid from v3.x) */
#define PCON_HEADLESS_SKU BIT(13)
struct opregion_header {
u8 signature[16];
u32 size;
@ -1135,6 +1137,18 @@ struct edid *intel_opregion_get_edid(struct intel_connector *intel_connector)
return new_edid;
}
bool intel_opregion_headless_sku(struct drm_i915_private *i915)
{
struct intel_opregion *opregion = &i915->opregion;
struct opregion_header *header = opregion->header;
if (!header || header->over.major < 2 ||
(header->over.major == 2 && header->over.minor < 3))
return false;
return opregion->header->pcon & PCON_HEADLESS_SKU;
}
void intel_opregion_register(struct drm_i915_private *i915)
{
struct intel_opregion *opregion = &i915->opregion;

7
drivers/gpu/drm/i915/display/intel_opregion.h
View file

@ -76,6 +76,8 @@ int intel_opregion_notify_adapter(struct drm_i915_private *dev_priv,
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_headless_sku(struct drm_i915_private *i915);
#else /* CONFIG_ACPI*/
static inline int intel_opregion_setup(struct drm_i915_private *dev_priv)
@ -127,6 +129,11 @@ intel_opregion_get_edid(struct intel_connector *connector)
return NULL;
}
static inline bool intel_opregion_headless_sku(struct drm_i915_private *i915)
{
return false;
}
#endif /* CONFIG_ACPI */
#endif