[PATCH] drm: Use a nondestructive mode for output detect when polling
Chris Wilson
chris at chris-wilson.co.uk
Thu Sep 9 15:51:02 PDT 2010
Destructive load-detection is very expensive and due to failings
elsewhere can trigger system wide stalls of up to 600ms. A simple
first step to correcting this is not to invoke such an expensive
and destructive load-detection operation automatically.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=29536
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=16265
Reported-by: Bruno Prémont <bonbons at linux-vserver.org>
Tested-by: Sitsofe Wheeler <sitsofe at yahoo.com>
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: stable at kernel.org
---
drivers/gpu/drm/drm_crtc_helper.c | 4 ++--
drivers/gpu/drm/drm_sysfs.c | 2 +-
drivers/gpu/drm/i915/intel_crt.c | 7 ++++++-
drivers/gpu/drm/i915/intel_dp.c | 3 ++-
drivers/gpu/drm/i915/intel_dvo.c | 4 +++-
drivers/gpu/drm/i915/intel_hdmi.c | 3 ++-
drivers/gpu/drm/i915/intel_lvds.c | 8 ++++++--
drivers/gpu/drm/i915/intel_sdvo.c | 6 ++++--
drivers/gpu/drm/i915/intel_tv.c | 12 ++++++------
drivers/gpu/drm/nouveau/nouveau_connector.c | 8 +++++---
drivers/gpu/drm/radeon/radeon_connectors.c | 20 +++++++++++++++-----
drivers/gpu/drm/vmwgfx/vmwgfx_ldu.c | 3 ++-
include/drm/drm_crtc.h | 3 ++-
13 files changed, 56 insertions(+), 27 deletions(-)
diff --git a/drivers/gpu/drm/drm_crtc_helper.c b/drivers/gpu/drm/drm_crtc_helper.c
index e92ecda..1c2af65 100644
--- a/drivers/gpu/drm/drm_crtc_helper.c
+++ b/drivers/gpu/drm/drm_crtc_helper.c
@@ -100,7 +100,7 @@ int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
if (connector->funcs->force)
connector->funcs->force(connector);
} else
- connector->status = connector->funcs->detect(connector);
+ connector->status = connector->funcs->detect(connector, false);
if (connector->status == connector_status_disconnected) {
DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n",
@@ -859,7 +859,7 @@ static void output_poll_execute(struct work_struct *work)
!(connector->polled & DRM_CONNECTOR_POLL_HPD))
continue;
- status = connector->funcs->detect(connector);
+ status = connector->funcs->detect(connector, true);
if (old_status != status)
changed = true;
}
diff --git a/drivers/gpu/drm/drm_sysfs.c b/drivers/gpu/drm/drm_sysfs.c
index 86118a7..85da4c4 100644
--- a/drivers/gpu/drm/drm_sysfs.c
+++ b/drivers/gpu/drm/drm_sysfs.c
@@ -159,7 +159,7 @@ static ssize_t status_show(struct device *device,
struct drm_connector *connector = to_drm_connector(device);
enum drm_connector_status status;
- status = connector->funcs->detect(connector);
+ status = connector->funcs->detect(connector, true);
return snprintf(buf, PAGE_SIZE, "%s\n",
drm_get_connector_status_name(status));
}
diff --git a/drivers/gpu/drm/i915/intel_crt.c b/drivers/gpu/drm/i915/intel_crt.c
index 4b77351..0350e5d 100644
--- a/drivers/gpu/drm/i915/intel_crt.c
+++ b/drivers/gpu/drm/i915/intel_crt.c
@@ -400,7 +400,9 @@ intel_crt_load_detect(struct drm_crtc *crtc, struct intel_encoder *intel_encoder
return status;
}
-static enum drm_connector_status intel_crt_detect(struct drm_connector *connector)
+static enum drm_connector_status
+intel_crt_detect(struct drm_connector *connector,
+ bool nondestructive)
{
struct drm_device *dev = connector->dev;
struct drm_encoder *encoder = intel_attached_encoder(connector);
@@ -419,6 +421,9 @@ static enum drm_connector_status intel_crt_detect(struct drm_connector *connecto
if (intel_crt_detect_ddc(encoder))
return connector_status_connected;
+ if (nondestructive)
+ return connector->status;
+
/* for pre-945g platforms use load detect */
if (encoder->crtc && encoder->crtc->enabled) {
status = intel_crt_load_detect(encoder->crtc, intel_encoder);
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 51d1429..e1a2a05 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -1386,7 +1386,8 @@ ironlake_dp_detect(struct drm_connector *connector)
* \return false if DP port is disconnected.
*/
static enum drm_connector_status
-intel_dp_detect(struct drm_connector *connector)
+intel_dp_detect(struct drm_connector *connector,
+ bool nondestructive)
{
struct drm_encoder *encoder = intel_attached_encoder(connector);
struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
diff --git a/drivers/gpu/drm/i915/intel_dvo.c b/drivers/gpu/drm/i915/intel_dvo.c
index a399f4b..f0de1ad 100644
--- a/drivers/gpu/drm/i915/intel_dvo.c
+++ b/drivers/gpu/drm/i915/intel_dvo.c
@@ -221,7 +221,9 @@ static void intel_dvo_mode_set(struct drm_encoder *encoder,
*
* Unimplemented.
*/
-static enum drm_connector_status intel_dvo_detect(struct drm_connector *connector)
+static enum drm_connector_status
+intel_dvo_detect(struct drm_connector *connector,
+ bool nondestructive)
{
struct drm_encoder *encoder = intel_attached_encoder(connector);
struct intel_dvo *intel_dvo = enc_to_intel_dvo(encoder);
diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
index ccd4c97..2ea123d 100644
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -139,7 +139,8 @@ static bool intel_hdmi_mode_fixup(struct drm_encoder *encoder,
}
static enum drm_connector_status
-intel_hdmi_detect(struct drm_connector *connector)
+intel_hdmi_detect(struct drm_connector *connector,
+ bool nondestructive)
{
struct drm_encoder *encoder = intel_attached_encoder(connector);
struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(encoder);
diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c
index 4fbb016..fb1bed8 100644
--- a/drivers/gpu/drm/i915/intel_lvds.c
+++ b/drivers/gpu/drm/i915/intel_lvds.c
@@ -445,7 +445,9 @@ static void intel_lvds_mode_set(struct drm_encoder *encoder,
* connected and closed means disconnected. We also send hotplug events as
* needed, using lid status notification from the input layer.
*/
-static enum drm_connector_status intel_lvds_detect(struct drm_connector *connector)
+static enum drm_connector_status
+intel_lvds_detect(struct drm_connector *connector,
+ bool nondestructive)
{
struct drm_device *dev = connector->dev;
enum drm_connector_status status = connector_status_connected;
@@ -540,7 +542,9 @@ static int intel_lid_notify(struct notifier_block *nb, unsigned long val,
* the LID nofication event.
*/
if (connector)
- connector->status = connector->funcs->detect(connector);
+ connector->status = connector->funcs->detect(connector,
+ true);
+
/* Don't force modeset on machines where it causes a GPU lockup */
if (dmi_check_system(intel_no_modeset_on_lid))
return NOTIFY_OK;
diff --git a/drivers/gpu/drm/i915/intel_sdvo.c b/drivers/gpu/drm/i915/intel_sdvo.c
index e3b7a7e..db6b6d4 100644
--- a/drivers/gpu/drm/i915/intel_sdvo.c
+++ b/drivers/gpu/drm/i915/intel_sdvo.c
@@ -1417,7 +1417,7 @@ intel_analog_is_connected(struct drm_device *dev)
if (!analog_connector)
return false;
- if (analog_connector->funcs->detect(analog_connector) ==
+ if (analog_connector->funcs->detect(analog_connector, true) ==
connector_status_disconnected)
return false;
@@ -1486,7 +1486,9 @@ intel_sdvo_hdmi_sink_detect(struct drm_connector *connector)
return status;
}
-static enum drm_connector_status intel_sdvo_detect(struct drm_connector *connector)
+static enum drm_connector_status
+intel_sdvo_detect(struct drm_connector *connector,
+ bool nondestructive)
{
uint16_t response;
struct drm_encoder *encoder = intel_attached_encoder(connector);
diff --git a/drivers/gpu/drm/i915/intel_tv.c b/drivers/gpu/drm/i915/intel_tv.c
index c671f60..d20b550 100644
--- a/drivers/gpu/drm/i915/intel_tv.c
+++ b/drivers/gpu/drm/i915/intel_tv.c
@@ -1341,7 +1341,8 @@ static void intel_tv_find_better_format(struct drm_connector *connector)
* we have a pipe programmed in order to probe the TV.
*/
static enum drm_connector_status
-intel_tv_detect(struct drm_connector *connector)
+intel_tv_detect(struct drm_connector *connector,
+ bool nondestructive)
{
struct drm_display_mode mode;
struct drm_encoder *encoder = intel_attached_encoder(connector);
@@ -1353,7 +1354,7 @@ intel_tv_detect(struct drm_connector *connector)
if (encoder->crtc && encoder->crtc->enabled) {
type = intel_tv_detect_type(intel_tv);
- } else {
+ } else if (nondestructive) {
struct drm_crtc *crtc;
int dpms_mode;
@@ -1364,10 +1365,9 @@ intel_tv_detect(struct drm_connector *connector)
intel_release_load_detect_pipe(&intel_tv->base, connector,
dpms_mode);
} else
- type = -1;
- }
-
- intel_tv->type = type;
+ return connector_status_unknown;
+ } else
+ return connector->status;
if (type < 0)
return connector_status_disconnected;
diff --git a/drivers/gpu/drm/nouveau/nouveau_connector.c b/drivers/gpu/drm/nouveau/nouveau_connector.c
index a1473ff..67d515c 100644
--- a/drivers/gpu/drm/nouveau/nouveau_connector.c
+++ b/drivers/gpu/drm/nouveau/nouveau_connector.c
@@ -168,7 +168,8 @@ nouveau_connector_set_encoder(struct drm_connector *connector,
}
static enum drm_connector_status
-nouveau_connector_detect(struct drm_connector *connector)
+nouveau_connector_detect(struct drm_connector *connector,
+ bool nondestructive)
{
struct drm_device *dev = connector->dev;
struct nouveau_connector *nv_connector = nouveau_connector(connector);
@@ -246,7 +247,8 @@ detect_analog:
}
static enum drm_connector_status
-nouveau_connector_detect_lvds(struct drm_connector *connector)
+nouveau_connector_detect_lvds(struct drm_connector *connector,
+ bool nondestructive)
{
struct drm_device *dev = connector->dev;
struct drm_nouveau_private *dev_priv = dev->dev_private;
@@ -267,7 +269,7 @@ nouveau_connector_detect_lvds(struct drm_connector *connector)
/* Try retrieving EDID via DDC */
if (!dev_priv->vbios.fp_no_ddc) {
- status = nouveau_connector_detect(connector);
+ status = nouveau_connector_detect(connector, nondestructive);
if (status == connector_status_connected)
goto out;
}
diff --git a/drivers/gpu/drm/radeon/radeon_connectors.c b/drivers/gpu/drm/radeon/radeon_connectors.c
index 1a5ee39..3d27637 100644
--- a/drivers/gpu/drm/radeon/radeon_connectors.c
+++ b/drivers/gpu/drm/radeon/radeon_connectors.c
@@ -481,7 +481,9 @@ static int radeon_lvds_mode_valid(struct drm_connector *connector,
return MODE_OK;
}
-static enum drm_connector_status radeon_lvds_detect(struct drm_connector *connector)
+static enum drm_connector_status
+radeon_lvds_detect(struct drm_connector *connector,
+ bool nondestructive)
{
struct radeon_connector *radeon_connector = to_radeon_connector(connector);
struct drm_encoder *encoder = radeon_best_single_encoder(connector);
@@ -594,7 +596,9 @@ static int radeon_vga_mode_valid(struct drm_connector *connector,
return MODE_OK;
}
-static enum drm_connector_status radeon_vga_detect(struct drm_connector *connector)
+static enum drm_connector_status
+radeon_vga_detect(struct drm_connector *connector,
+ bool nondestructive)
{
struct radeon_connector *radeon_connector = to_radeon_connector(connector);
struct drm_encoder *encoder;
@@ -691,7 +695,9 @@ static int radeon_tv_mode_valid(struct drm_connector *connector,
return MODE_OK;
}
-static enum drm_connector_status radeon_tv_detect(struct drm_connector *connector)
+static enum drm_connector_status
+radeon_tv_detect(struct drm_connector *connector,
+ bool nondestructive)
{
struct drm_encoder *encoder;
struct drm_encoder_helper_funcs *encoder_funcs;
@@ -748,7 +754,9 @@ static int radeon_dvi_get_modes(struct drm_connector *connector)
* we have to check if this analog encoder is shared with anyone else (TV)
* if its shared we have to set the other connector to disconnected.
*/
-static enum drm_connector_status radeon_dvi_detect(struct drm_connector *connector)
+static enum drm_connector_status
+radeon_dvi_detect(struct drm_connector *connector,
+ bool nondestructive)
{
struct radeon_connector *radeon_connector = to_radeon_connector(connector);
struct drm_encoder *encoder = NULL;
@@ -972,7 +980,9 @@ static int radeon_dp_get_modes(struct drm_connector *connector)
return ret;
}
-static enum drm_connector_status radeon_dp_detect(struct drm_connector *connector)
+static enum drm_connector_status
+radeon_dp_detect(struct drm_connector *connector,
+ bool nondestructive)
{
struct radeon_connector *radeon_connector = to_radeon_connector(connector);
enum drm_connector_status ret = connector_status_disconnected;
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_ldu.c b/drivers/gpu/drm/vmwgfx/vmwgfx_ldu.c
index 2ff5cf7..a527c91 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_ldu.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_ldu.c
@@ -335,7 +335,8 @@ static void vmw_ldu_connector_restore(struct drm_connector *connector)
}
static enum drm_connector_status
- vmw_ldu_connector_detect(struct drm_connector *connector)
+ vmw_ldu_connector_detect(struct drm_connector *connector,
+ bool nondestructive)
{
if (vmw_connector_to_ldu(connector)->pref_active)
return connector_status_connected;
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index c9f3cc5..5536223 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -386,7 +386,8 @@ struct drm_connector_funcs {
void (*dpms)(struct drm_connector *connector, int mode);
void (*save)(struct drm_connector *connector);
void (*restore)(struct drm_connector *connector);
- enum drm_connector_status (*detect)(struct drm_connector *connector);
+ enum drm_connector_status (*detect)(struct drm_connector *connector,
+ bool nondestructive);
int (*fill_modes)(struct drm_connector *connector, uint32_t max_width, uint32_t max_height);
int (*set_property)(struct drm_connector *connector, struct drm_property *property,
uint64_t val);
--
1.7.1
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