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Subject[PATCH 3/3 v2] drm/i915: hot plug/unplug notification to HDMI audio driver
On monitor hot plug/unplug, update ELD and set/clear SDVO_AUDIO_ENABLE
or DP_AUDIO_OUTPUT_ENABLE accordingly. So that the audio driver will
receive hot plug events and take action to refresh its device state and
ELD contents.

A new callback ->hotplug() is added to struct drm_connector_funcs which
will be called immediately after ->detect() knowing that the monitor is
either plugged or unplugged.

It's noticed that X may not call ->mode_set() at monitor hot plug, so it's
necessary to call drm_edid_to_eld() earlier at ->detect() time rather than
in intel_ddc_get_modes(), so that intel_write_eld() can see the new ELD
in ->hotplug.

The call sequence on hot plug is
(the difference part lies in ->mode_set vs ->hotplug)

- KMS console
->detect
drm_edid_to_eld
->mode_set
intel_write_eld
set SDVO_AUDIO_ENABLE/DP_AUDIO_OUTPUT_ENABLE
- X
->detect
drm_edid_to_eld
->hotplug
intel_write_eld
set SDVO_AUDIO_ENABLE/DP_AUDIO_OUTPUT_ENABLE

On hot remove, the call sequence is

->hotplug
clear SDVO_AUDIO_ENABLE/DP_AUDIO_OUTPUT_ENABLE

cc: Wang Zhenyu <zhenyu.z.wang@intel.com>
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
---
drivers/gpu/drm/drm_crtc_helper.c | 5 ++-
drivers/gpu/drm/i915/intel_dp.c | 44 +++++++++++++++++++++------
drivers/gpu/drm/i915/intel_hdmi.c | 31 +++++++++++++++++++
drivers/gpu/drm/i915/intel_modes.c | 2 -
include/drm/drm_crtc.h | 1
5 files changed, 71 insertions(+), 12 deletions(-)
--- linux.orig/drivers/gpu/drm/i915/intel_dp.c 2011-11-21 11:26:09.000000000 +0800
+++ linux/drivers/gpu/drm/i915/intel_dp.c 2011-11-21 14:12:21.000000000 +0800
@@ -28,6 +28,7 @@
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/export.h>
+#include <drm/drm_edid.h>
#include "drmP.h"
#include "drm.h"
#include "drm_crtc.h"
@@ -1970,20 +1971,44 @@ intel_dp_detect(struct drm_connector *co
if (status != connector_status_connected)
return status;

- if (intel_dp->force_audio) {
- intel_dp->has_audio = intel_dp->force_audio > 0;
- } else {
- edid = intel_dp_get_edid(connector, &intel_dp->adapter);
- if (edid) {
- intel_dp->has_audio = drm_detect_monitor_audio(edid);
- connector->display_info.raw_edid = NULL;
- kfree(edid);
- }
+ edid = intel_dp_get_edid(connector, &intel_dp->adapter);
+ if (edid) {
+ intel_dp->has_audio = drm_detect_monitor_audio(edid);
+ drm_edid_to_eld(connector, edid);
+ connector->display_info.raw_edid = NULL;
+ kfree(edid);
}

+ if (intel_dp->force_audio)
+ intel_dp->has_audio = intel_dp->force_audio > 0;
+
return connector_status_connected;
}

+static void intel_dp_hotplug(struct drm_connector *connector)
+{
+ struct intel_dp *intel_dp = intel_attached_dp(connector);
+ struct drm_device *dev = intel_dp->base.base.dev;
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ struct drm_crtc *crtc = intel_dp->base.base.crtc;
+
+ DRM_DEBUG_DRIVER("DisplayPort hotplug status %d crtc %p eld %#x\n",
+ connector->status,
+ crtc,
+ (unsigned int)connector->eld[0]);
+
+ if (connector->status == connector_status_disconnected) {
+ intel_dp->DP &= ~DP_AUDIO_OUTPUT_ENABLE;
+ } else if (connector->status == connector_status_connected && crtc) {
+ intel_write_eld(&intel_dp->base.base, &crtc->mode);
+ intel_dp->DP |= DP_AUDIO_OUTPUT_ENABLE;
+ } else {
+ return;
+ }
+ I915_WRITE(intel_dp->output_reg, intel_dp->DP);
+ POSTING_READ(intel_dp->output_reg);
+}
+
static int intel_dp_get_modes(struct drm_connector *connector)
{
struct intel_dp *intel_dp = intel_attached_dp(connector);
@@ -2143,6 +2168,7 @@ static const struct drm_connector_funcs
.detect = intel_dp_detect,
.fill_modes = drm_helper_probe_single_connector_modes,
.set_property = intel_dp_set_property,
+ .hotplug = intel_dp_hotplug,
.destroy = intel_dp_destroy,
};

--- linux.orig/drivers/gpu/drm/i915/intel_hdmi.c 2011-11-21 11:26:09.000000000 +0800
+++ linux/drivers/gpu/drm/i915/intel_hdmi.c 2011-11-21 14:12:26.000000000 +0800
@@ -337,6 +337,7 @@ intel_hdmi_detect(struct drm_connector *
status = connector_status_connected;
intel_hdmi->has_hdmi_sink = drm_detect_hdmi_monitor(edid);
intel_hdmi->has_audio = drm_detect_monitor_audio(edid);
+ drm_edid_to_eld(connector, edid);
}
connector->display_info.raw_edid = NULL;
kfree(edid);
@@ -350,6 +351,35 @@ intel_hdmi_detect(struct drm_connector *
return status;
}

+static void intel_hdmi_hotplug(struct drm_connector *connector)
+{
+ struct intel_hdmi *intel_hdmi = intel_attached_hdmi(connector);
+ struct drm_i915_private *dev_priv = connector->dev->dev_private;
+ struct drm_crtc *crtc = intel_hdmi->base.base.crtc;
+ u32 temp;
+
+ DRM_DEBUG_DRIVER("HDMI hotplug status %d crtc %p eld %#x\n",
+ connector->status,
+ crtc,
+ (unsigned int)connector->eld[0]);
+
+ if (connector->status == connector_status_disconnected) {
+ temp = I915_READ(intel_hdmi->sdvox_reg) & ~SDVO_AUDIO_ENABLE;
+ } else if (connector->status == connector_status_connected && crtc) {
+ /*
+ * It's for X only, which may not call ->mode_set on hot plug.
+ * KMS console has NULL crtc at this time and will
+ * call ->mode_set to enable HDMI audio a bit later.
+ */
+ intel_write_eld(&intel_hdmi->base.base, &crtc->mode);
+ temp = I915_READ(intel_hdmi->sdvox_reg) | SDVO_AUDIO_ENABLE;
+ } else {
+ return;
+ }
+ I915_WRITE(intel_hdmi->sdvox_reg, temp);
+ POSTING_READ(intel_hdmi->sdvox_reg);
+}
+
static int intel_hdmi_get_modes(struct drm_connector *connector)
{
struct intel_hdmi *intel_hdmi = intel_attached_hdmi(connector);
@@ -459,6 +489,7 @@ static const struct drm_connector_funcs
.detect = intel_hdmi_detect,
.fill_modes = drm_helper_probe_single_connector_modes,
.set_property = intel_hdmi_set_property,
+ .hotplug = intel_hdmi_hotplug,
.destroy = intel_hdmi_destroy,
};

--- linux.orig/drivers/gpu/drm/drm_crtc_helper.c 2011-11-21 11:26:09.000000000 +0800
+++ linux/drivers/gpu/drm/drm_crtc_helper.c 2011-11-21 11:26:14.000000000 +0800
@@ -903,8 +903,11 @@ static void output_poll_execute(struct w
connector->base.id,
drm_get_connector_name(connector),
old_status, connector->status);
- if (old_status != connector->status)
+ if (old_status != connector->status) {
changed = true;
+ connector->funcs->hotplug(connector);
+ }
+
}

mutex_unlock(&dev->mode_config.mutex);
--- linux.orig/include/drm/drm_crtc.h 2011-11-21 11:26:09.000000000 +0800
+++ linux/include/drm/drm_crtc.h 2011-11-21 11:26:14.000000000 +0800
@@ -419,6 +419,7 @@ struct drm_connector_funcs {
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);
+ void (*hotplug)(struct drm_connector *connector);
void (*destroy)(struct drm_connector *connector);
void (*force)(struct drm_connector *connector);
};
--- linux.orig/drivers/gpu/drm/i915/intel_modes.c 2011-11-21 11:26:09.000000000 +0800
+++ linux/drivers/gpu/drm/i915/intel_modes.c 2011-11-21 11:26:14.000000000 +0800
@@ -26,7 +26,6 @@
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/fb.h>
-#include <drm/drm_edid.h>
#include "drmP.h"
#include "intel_drv.h"
#include "i915_drv.h"
@@ -75,7 +74,6 @@ int intel_ddc_get_modes(struct drm_conne
if (edid) {
drm_mode_connector_update_edid_property(connector, edid);
ret = drm_add_edid_modes(connector, edid);
- drm_edid_to_eld(connector, edid);
connector->display_info.raw_edid = NULL;
kfree(edid);
}

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