Revert "drm/i915: Check live status before reading edid"

commit 23f889bdf6ee5cfff012d8b09f6bec920c691696 upstream.

This reverts commit 237ed86c693d8a8e4db476976aeb30df4deac74b.

Our current implementation of live status check (repeat 9 times
with 10ms delays between each attempt as a workaround for
buggy displays) imposes a rather serious penalty, time wise,
on intel_hdmi_detect().  Since we we already skip live status
checks on platforms before gen 7, and since we seem to have
coped quite well before the live status check was introduced
for newer platforms too, the previous behaviour is probably
preferable, at least unless someone can point to a use-case
that the live status check improves (apart from "Bspec says so".)

Signed-off-by: David Weinehall <david.weinehall@linux.intel.com>
Fixes: 237ed86c693d ("drm/i915: Check live status before reading edid")
Fixes: f8d03ea0053b ("drm/i915: increase the tries for HDMI hotplug live status checking")
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=97139
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=94014
Acked-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20160817124748.31208-1-david.weinehall@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index ebbd23407a80cb4a1228661a6cd22fd362539af2..0f8367da0663f23560dea3e0ff416ddf16f39029 100644 (file)
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -4648,7 +4648,7 @@ static bool bxt_digital_port_connected(struct drm_i915_private *dev_priv,
  *
  * Return %true if @port is connected, %false otherwise.
  */
-bool intel_digital_port_connected(struct drm_i915_private *dev_priv,
+static bool intel_digital_port_connected(struct drm_i915_private *dev_priv,
                                         struct intel_digital_port *port)
 {
        if (HAS_PCH_IBX(dev_priv))

diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 41442e6195959006a31136e707b3cd33e62bb1f5..722aa159cd28a3154e6bccb6e69b8c478b5bc21b 100644 (file)
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1231,8 +1231,6 @@ void intel_edp_drrs_disable(struct intel_dp *intel_dp);
 void intel_edp_drrs_invalidate(struct drm_device *dev,
                unsigned frontbuffer_bits);
 void intel_edp_drrs_flush(struct drm_device *dev, unsigned frontbuffer_bits);
-bool intel_digital_port_connected(struct drm_i915_private *dev_priv,
-                                        struct intel_digital_port *port);
 void hsw_dp_set_ddi_pll_sel(struct intel_crtc_state *pipe_config);
 
 /* intel_dp_mst.c */

diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
index dff69fef47e0108c4a45b71ab67a85c3fb7c1aab..3b92cad8bef2fe345606cac8254b835852f938c3 100644 (file)
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -1331,19 +1331,18 @@ intel_hdmi_unset_edid(struct drm_connector *connector)
 }
 
 static bool
-intel_hdmi_set_edid(struct drm_connector *connector, bool force)
+intel_hdmi_set_edid(struct drm_connector *connector)
 {
        struct drm_i915_private *dev_priv = to_i915(connector->dev);
        struct intel_hdmi *intel_hdmi = intel_attached_hdmi(connector);
-       struct edid *edid = NULL;
+       struct edid *edid;
        bool connected = false;
 
        intel_display_power_get(dev_priv, POWER_DOMAIN_GMBUS);
 
-       if (force)
-               edid = drm_get_edid(connector,
-                                   intel_gmbus_get_adapter(dev_priv,
-                                   intel_hdmi->ddc_bus));
+       edid = drm_get_edid(connector,
+                           intel_gmbus_get_adapter(dev_priv,
+                           intel_hdmi->ddc_bus));
 
        intel_display_power_put(dev_priv, POWER_DOMAIN_GMBUS);
 
@@ -1371,37 +1370,16 @@ static enum drm_connector_status
 intel_hdmi_detect(struct drm_connector *connector, bool force)
 {
        enum drm_connector_status status;
-       struct intel_hdmi *intel_hdmi = intel_attached_hdmi(connector);
        struct drm_i915_private *dev_priv = to_i915(connector->dev);
-       bool live_status = false;
-       unsigned int try;
 
        DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n",
                      connector->base.id, connector->name);
 
        intel_display_power_get(dev_priv, POWER_DOMAIN_GMBUS);
 
-       for (try = 0; !live_status && try < 9; try++) {
-               if (try)
-                       msleep(10);
-               live_status = intel_digital_port_connected(dev_priv,
-                               hdmi_to_dig_port(intel_hdmi));
-       }
-
-       if (!live_status) {
-               DRM_DEBUG_KMS("HDMI live status down\n");
-               /*
-                * Live status register is not reliable on all intel platforms.
-                * So consider live_status only for certain platforms, for
-                * others, read EDID to determine presence of sink.
-                */
-               if (INTEL_INFO(dev_priv)->gen < 7 || IS_IVYBRIDGE(dev_priv))
-                       live_status = true;
-       }
-
        intel_hdmi_unset_edid(connector);
 
-       if (intel_hdmi_set_edid(connector, live_status)) {
+       if (intel_hdmi_set_edid(connector)) {
                struct intel_hdmi *intel_hdmi = intel_attached_hdmi(connector);
 
                hdmi_to_dig_port(intel_hdmi)->base.type = INTEL_OUTPUT_HDMI;
@@ -1427,7 +1405,7 @@ intel_hdmi_force(struct drm_connector *connector)
        if (connector->status != connector_status_connected)
                return;
 
-       intel_hdmi_set_edid(connector, true);
+       intel_hdmi_set_edid(connector);
        hdmi_to_dig_port(intel_hdmi)->base.type = INTEL_OUTPUT_HDMI;
 }