@@ -222,11 +222,23 @@ static u32 acpi_display_type(struct intel_connector *connector)
return display_type;
}
+/*
+ * Ref: ACPI Spec 6.3
+ * https://uefi.org/sites/default/files/resources/ACPI_6_3_final_Jan30.pdf
+ * Pages 1119 - 1123 describe, what I believe, a standard way of
+ * identifying / addressing "display panels" in the ACPI. It provides
+ * a way for the ACPI to define devices for the display panels attached
+ * to the system. It thus provides a way for the BIOS to export any panel
+ * specific properties to the system via ACPI (like device trees).
+ */
void intel_acpi_device_id_update(struct drm_i915_private *dev_priv)
{
struct drm_device *drm_dev = &dev_priv->drm;
struct intel_connector *connector;
struct drm_connector_list_iter conn_iter;
+ struct device *dev = &drm_dev->pdev->dev;
+ struct acpi_device *conn_dev;
+ u64 conn_addr;
u8 display_index[16] = {};
/* Populate the ACPI IDs for all connectors for a given drm_device */
@@ -242,6 +254,18 @@ void intel_acpi_device_id_update(struct drm_i915_private *dev_priv)
device_id |= display_index[type]++ << ACPI_DISPLAY_INDEX_SHIFT;
connector->acpi_device_id = device_id;
+
+ /* Build the _ADR to look for */
+ conn_addr = device_id | ACPI_DEVICE_ID_SCHEME |
+ ACPI_BIOS_CAN_DETECT;
+
+ DRM_DEV_INFO(dev, "Checking connector ACPI node at _ADR=%llX\n",
+ conn_addr);
+
+ /* Look up the connector device, under the PCI device */
+ conn_dev = acpi_find_child_device(ACPI_COMPANION(dev),
+ conn_addr, false);
+ connector->acpi_handle = conn_dev ? conn_dev->handle : NULL;
}
drm_connector_list_iter_end(&conn_iter);
}
@@ -407,6 +407,9 @@ struct intel_connector {
/* ACPI device id for ACPI and driver cooperation */
u32 acpi_device_id;
+ /* ACPI handle corresponding to this connector display, if found */
+ void *acpi_handle;
+
/* Reads out the current hw, returning true if the connector is enabled
* and active (i.e. dpms ON state). */
bool (*get_hw_state)(struct intel_connector *);
@@ -45,6 +45,7 @@
#include "i915_debugfs.h"
#include "i915_drv.h"
#include "i915_trace.h"
+#include "intel_acpi.h"
#include "intel_atomic.h"
#include "intel_audio.h"
#include "intel_connector.h"
@@ -6623,6 +6624,8 @@ intel_dp_add_properties(struct intel_dp *intel_dp, struct drm_connector *connect
connector->state->scaling_mode = DRM_MODE_SCALE_ASPECT;
+ /* Lookup the ACPI node corresponding to the connector */
+ intel_acpi_device_id_update(dev_priv);
}
}
Lookup and attach ACPI nodes for intel connectors. The lookup is done in compliance with ACPI Spec 6.3 https://uefi.org/sites/default/files/resources/ACPI_6_3_final_Jan30.pdf (Ref: Pages 1119 - 1123). This can be useful for any connector specific platform properties. (This will be used for privacy screen in next patch). Signed-off-by: Rajat Jain <rajatja@google.com> --- v4: Same as v3 v3: fold the code into existing acpi_device_id_update() function v2: formed by splitting the original patch into ACPI lookup, and privacy screen property. Also move it into i915 now that I found existing code in i915 that can be re-used. drivers/gpu/drm/i915/display/intel_acpi.c | 24 +++++++++++++++++++ .../drm/i915/display/intel_display_types.h | 3 +++ drivers/gpu/drm/i915/display/intel_dp.c | 3 +++ 3 files changed, 30 insertions(+)