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Message-Id: <20200305011943.214146-2-rajatja@google.com>
Date: Wed, 4 Mar 2020 17:19:42 -0800
From: Rajat Jain <rajatja@...gle.com>
To: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Maxime Ripard <mripard@...nel.org>,
Sean Paul <sean@...rly.run>, David Airlie <airlied@...ux.ie>,
Daniel Vetter <daniel@...ll.ch>,
Jani Nikula <jani.nikula@...ux.intel.com>,
Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
Rodrigo Vivi <rodrigo.vivi@...el.com>,
"Ville Syrjälä"
<ville.syrjala@...ux.intel.com>,
Chris Wilson <chris@...is-wilson.co.uk>,
Imre Deak <imre.deak@...el.com>,
"José Roberto de Souza" <jose.souza@...el.com>,
linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
intel-gfx@...ts.freedesktop.org, gregkh@...uxfoundation.org,
mathewk@...gle.com, Daniel Thompson <daniel.thompson@...aro.org>,
Jonathan Corbet <corbet@....net>, Pavel Machek <pavel@...x.de>,
seanpaul@...gle.com, Duncan Laurie <dlaurie@...gle.com>,
jsbarnes@...gle.com, Thierry Reding <thierry.reding@...il.com>,
mpearson@...ovo.com, Nitin Joshi1 <njoshi1@...ovo.com>,
Sugumaran Lacshiminarayanan <slacshiminar@...ovo.com>,
Tomoki Maruichi <maruichit@...ovo.com>
Cc: Rajat Jain <rajatja@...gle.com>, rajatxjain@...il.com
Subject: [PATCH v6 2/3] drm/i915: Lookup and attach ACPI device node for connectors
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@...gle.com>
---
v6: Addressed minor comments from Jani at
https://lkml.org/lkml/2020/1/24/1143
- local variable renamed.
- used drm_dbg_kms()
- used acpi_device_handle()
- Used opaque type acpi_handle instead of void*
v5: same as v4
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 | 5 ++++
drivers/gpu/drm/i915/display/intel_dp.c | 3 +++
3 files changed, 32 insertions(+)
diff --git a/drivers/gpu/drm/i915/display/intel_acpi.c b/drivers/gpu/drm/i915/display/intel_acpi.c
index 3e6831cca4ac1..870c1ad98df92 100644
--- a/drivers/gpu/drm/i915/display/intel_acpi.c
+++ b/drivers/gpu/drm/i915/display/intel_acpi.c
@@ -222,11 +222,22 @@ 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 *dev = &dev_priv->drm;
struct intel_connector *connector;
struct drm_connector_list_iter conn_iter;
+ 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 +253,19 @@ 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_dbg_kms(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->pdev->dev),
+ conn_addr, false);
+ connector->acpi_handle = acpi_device_handle(conn_dev);
}
drm_connector_list_iter_end(&conn_iter);
}
diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
index 5e00e611f077f..d70612cc1ba2a 100644
--- a/drivers/gpu/drm/i915/display/intel_display_types.h
+++ b/drivers/gpu/drm/i915/display/intel_display_types.h
@@ -411,9 +411,14 @@ struct intel_connector {
*/
struct intel_encoder *encoder;
+#ifdef CONFIG_ACPI
/* ACPI device id for ACPI and driver cooperation */
u32 acpi_device_id;
+ /* ACPI handle corresponding to this connector display, if found */
+ acpi_handle acpi_handle;
+#endif
+
/* 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 *);
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index 0a417cd2af2bc..171821113d362 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -44,6 +44,7 @@
#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"
@@ -6868,6 +6869,8 @@ 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);
}
}
--
2.25.0.265.gbab2e86ba0-goog
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