From: Rajat Jain <rajatja@google.com>
To: "Maarten Lankhorst" <maarten.lankhorst@linux.intel.com>,
"Maxime Ripard" <mripard@kernel.org>,
"Sean Paul" <sean@poorly.run>, "David Airlie" <airlied@linux.ie>,
"Daniel Vetter" <daniel@ffwll.ch>,
"Jani Nikula" <jani.nikula@linux.intel.com>,
"Joonas Lahtinen" <joonas.lahtinen@linux.intel.com>,
"Rodrigo Vivi" <rodrigo.vivi@intel.com>,
"Ville Syrjälä" <ville.syrjala@linux.intel.com>,
"Chris Wilson" <chris@chris-wilson.co.uk>,
"Imre Deak" <imre.deak@intel.com>,
"José Roberto de Souza" <jose.souza@intel.com>,
linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
intel-gfx@lists.freedesktop.org, gregkh@linuxfoundation.org,
mathewk@google.com,
"Daniel Thompson" <daniel.thompson@linaro.org>,
"Jonathan Corbet" <corbet@lwn.net>,
"Pavel Machek" <pavel@denx.de>,
seanpaul@google.com, "Duncan Laurie" <dlaurie@google.com>,
jsbarnes@google.com, "Thierry Reding" <thierry.reding@gmail.com>
Cc: Rajat Jain <rajatja@google.com>, rajatxjain@gmail.com
Subject: [PATCH v5 2/3] drm/i915: Lookup and attach ACPI device node for connectors
Date: Fri, 20 Dec 2019 12:03:52 -0800 [thread overview]
Message-ID: <20191220200353.252399-2-rajatja@google.com> (raw)
In-Reply-To: <20191220200353.252399-1-rajatja@google.com>
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>
---
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 | 3 +++
drivers/gpu/drm/i915/display/intel_dp.c | 3 +++
3 files changed, 30 insertions(+)
diff --git a/drivers/gpu/drm/i915/display/intel_acpi.c b/drivers/gpu/drm/i915/display/intel_acpi.c
index e21fb14d5e07..101a56c08996 100644
--- a/drivers/gpu/drm/i915/display/intel_acpi.c
+++ b/drivers/gpu/drm/i915/display/intel_acpi.c
@@ -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);
}
diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
index 1a7334dbe802..0a4a04116091 100644
--- a/drivers/gpu/drm/i915/display/intel_display_types.h
+++ b/drivers/gpu/drm/i915/display/intel_display_types.h
@@ -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 *);
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index b05b2191b919..93cece8e2516 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -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);
}
}
--
2.24.1.735.g03f4e72817-goog
next prev parent reply other threads:[~2019-12-20 20:04 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-20 20:03 [PATCH v5 1/3] drm/i915: Move the code to populate ACPI device ID into intel_acpi Rajat Jain
2019-12-20 20:03 ` Rajat Jain [this message]
2020-01-24 11:37 ` [PATCH v5 2/3] drm/i915: Lookup and attach ACPI device node for connectors Jani Nikula
2020-01-24 20:23 ` Rajat Jain
2019-12-20 20:03 ` [PATCH v5 3/3] drm/i915: Add support for integrated privacy screens Rajat Jain
2020-01-21 7:25 ` Rajat Jain
2020-01-25 0:11 ` [v5,3/3] " Guenter Roeck
2020-01-28 1:33 ` Rajat Jain
2020-01-24 11:03 ` [PATCH v5 1/3] drm/i915: Move the code to populate ACPI device ID into intel_acpi Jani Nikula
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20191220200353.252399-2-rajatja@google.com \
--to=rajatja@google.com \
--cc=airlied@linux.ie \
--cc=chris@chris-wilson.co.uk \
--cc=corbet@lwn.net \
--cc=daniel.thompson@linaro.org \
--cc=daniel@ffwll.ch \
--cc=dlaurie@google.com \
--cc=dri-devel@lists.freedesktop.org \
--cc=gregkh@linuxfoundation.org \
--cc=imre.deak@intel.com \
--cc=intel-gfx@lists.freedesktop.org \
--cc=jani.nikula@linux.intel.com \
--cc=joonas.lahtinen@linux.intel.com \
--cc=jose.souza@intel.com \
--cc=jsbarnes@google.com \
--cc=linux-kernel@vger.kernel.org \
--cc=maarten.lankhorst@linux.intel.com \
--cc=mathewk@google.com \
--cc=mripard@kernel.org \
--cc=pavel@denx.de \
--cc=rajatxjain@gmail.com \
--cc=rodrigo.vivi@intel.com \
--cc=sean@poorly.run \
--cc=seanpaul@google.com \
--cc=thierry.reding@gmail.com \
--cc=ville.syrjala@linux.intel.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).