| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-Id: <20200826182456.322681-16-lyude@redhat.com>
Date: Wed, 26 Aug 2020 14:24:51 -0400
From: Lyude Paul <lyude@...hat.com>
To: dri-devel@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org,
nouveau@...ts.freedesktop.org
Cc: Sean Paul <sean@...rly.run>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Maxime Ripard <mripard@...nel.org>,
Thomas Zimmermann <tzimmermann@...e.de>,
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>,
José Roberto de Souza <jose.souza@...el.com>,
Manasi Navare <manasi.d.navare@...el.com>,
Uma Shankar <uma.shankar@...el.com>,
Gwan-gyeong Mun <gwan-gyeong.mun@...el.com>,
Imre Deak <imre.deak@...el.com>,
Wambui Karuga <wambui.karugax@...il.com>,
Lucas De Marchi <lucas.demarchi@...el.com>,
linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v5 15/20] drm/i915/dp: Extract drm_dp_read_sink_count_cap()
Since other drivers are also going to need to be aware of the sink count
in order to do proper dongle detection, we might as well steal i915's
DP_SINK_COUNT helpers and move them into DRM helpers so that other
dirvers can use them as well.
Note that this also starts using intel_dp_has_sink_count() in
intel_dp_detect_dpcd(), which is a functional change.
v5:
* Change name from drm_dp_has_sink_count() to
drm_dp_read_sink_count_cap()
Signed-off-by: Lyude Paul <lyude@...hat.com>
Reviewed-by: Sean Paul <sean@...rly.run>
---
drivers/gpu/drm/drm_dp_helper.c | 22 ++++++++++++++++++++++
drivers/gpu/drm/i915/display/intel_dp.c | 21 ++++++++++++---------
include/drm/drm_dp_helper.h | 8 +++++++-
3 files changed, 41 insertions(+), 10 deletions(-)
diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
index f3643894ad951..65ff21ae0c271 100644
--- a/drivers/gpu/drm/drm_dp_helper.c
+++ b/drivers/gpu/drm/drm_dp_helper.c
@@ -726,6 +726,28 @@ void drm_dp_set_subconnector_property(struct drm_connector *connector,
}
EXPORT_SYMBOL(drm_dp_set_subconnector_property);
+/**
+ * drm_dp_read_sink_count_cap() - Check whether a given connector has a valid sink
+ * count
+ * @connector: The DRM connector to check
+ * @dpcd: A cached copy of the connector's DPCD RX capabilities
+ * @desc: A cached copy of the connector's DP descriptor
+ *
+ * Returns: %True if the (e)DP connector has a valid sink count that should
+ * be probed, %false otherwise.
+ */
+bool drm_dp_read_sink_count_cap(struct drm_connector *connector,
+ const u8 dpcd[DP_RECEIVER_CAP_SIZE],
+ const struct drm_dp_desc *desc)
+{
+ /* Some eDP panels don't set a valid value for the sink count */
+ return connector->connector_type != DRM_MODE_CONNECTOR_eDP &&
+ dpcd[DP_DPCD_REV] >= DP_DPCD_REV_11 &&
+ dpcd[DP_DOWNSTREAMPORT_PRESENT] & DP_DWN_STRM_PORT_PRESENT &&
+ !drm_dp_has_quirk(desc, 0, DP_DPCD_QUIRK_NO_SINK_COUNT);
+}
+EXPORT_SYMBOL(drm_dp_read_sink_count_cap);
+
/*
* I2C-over-AUX implementation
*/
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index 9c4b806af8c79..38318ae935f88 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -4634,6 +4634,16 @@ intel_edp_init_dpcd(struct intel_dp *intel_dp)
return true;
}
+static bool
+intel_dp_has_sink_count(struct intel_dp *intel_dp)
+{
+ if (!intel_dp->attached_connector)
+ return false;
+
+ return drm_dp_read_sink_count_cap(&intel_dp->attached_connector->base,
+ intel_dp->dpcd,
+ &intel_dp->desc);
+}
static bool
intel_dp_get_dpcd(struct intel_dp *intel_dp)
@@ -4653,13 +4663,7 @@ intel_dp_get_dpcd(struct intel_dp *intel_dp)
intel_dp_set_common_rates(intel_dp);
}
- /*
- * Some eDP panels do not set a valid value for sink count, that is why
- * it don't care about read it here and in intel_edp_init_dpcd().
- */
- if (!intel_dp_is_edp(intel_dp) &&
- !drm_dp_has_quirk(&intel_dp->desc, 0,
- DP_DPCD_QUIRK_NO_SINK_COUNT)) {
+ if (intel_dp_has_sink_count(intel_dp)) {
u8 count;
ssize_t r;
@@ -5939,9 +5943,8 @@ intel_dp_detect_dpcd(struct intel_dp *intel_dp)
return connector_status_connected;
/* If we're HPD-aware, SINK_COUNT changes dynamically */
- if (intel_dp->dpcd[DP_DPCD_REV] >= 0x11 &&
+ if (intel_dp_has_sink_count(intel_dp) &&
intel_dp->downstream_ports[0] & DP_DS_PORT_HPD) {
-
return intel_dp->sink_count ?
connector_status_connected : connector_status_disconnected;
}
diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
index b8716b200666f..4c56ce4dc54fc 100644
--- a/include/drm/drm_dp_helper.h
+++ b/include/drm/drm_dp_helper.h
@@ -1631,6 +1631,11 @@ void drm_dp_set_subconnector_property(struct drm_connector *connector,
const u8 *dpcd,
const u8 port_cap[4]);
+struct drm_dp_desc;
+bool drm_dp_read_sink_count_cap(struct drm_connector *connector,
+ const u8 dpcd[DP_RECEIVER_CAP_SIZE],
+ const struct drm_dp_desc *desc);
+
void drm_dp_remote_aux_init(struct drm_dp_aux *aux);
void drm_dp_aux_init(struct drm_dp_aux *aux);
int drm_dp_aux_register(struct drm_dp_aux *aux);
@@ -1689,7 +1694,8 @@ enum drm_dp_quirk {
* @DP_DPCD_QUIRK_NO_SINK_COUNT:
*
* The device does not set SINK_COUNT to a non-zero value.
- * The driver should ignore SINK_COUNT during detection.
+ * The driver should ignore SINK_COUNT during detection. Note that
+ * drm_dp_read_sink_count_cap() automatically checks for this quirk.
*/
DP_DPCD_QUIRK_NO_SINK_COUNT,
/**
--
2.26.2
Powered by blists - more mailing lists