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SubjectRe: [PATCH 3/3 v2] drm/i915: hot plug/unplug notification to HDMI audio driver
On Wed, Nov 23, 2011 at 02:25:14AM +0800, Keith Packard wrote:
> On Tue, 22 Nov 2011 15:40:55 +0800, Wu Fengguang <fengguang.wu@intel.com> wrote:
>
> > So the v3 patch will behave equally well on KMS console, gnome desktop
> > and bare X. Shall we just use it, or go back and use the original
> > ->hot_remove patch?
>
> I'm not sure why we need any change to the core DRM code. The HDMI and
> DP drivers will be told when to turn the monitors on and off, and that's

Yeah, The DP driver will be notified via the intel_dp_hot_plug() hook
if I understand it right.

> the appropriate time to control whether audio is routed to them.

However ->hot_plug() is called too early to be useful for this case.

What I need is a hot plug hook that knows whether the monitor is
plugged or removed, which is only possible if the hook is called
after ->detect().

Or, we can avoid adding the ->hotplug() hook and just add the call
directly to intel_hdmi_detect() and intel_dp_detect().

The below patch does this and eliminates the DRM callback :-)

> Hotplug is considered simply a notification to user space that
> something has changed -- user space is in charge of configuring
> which outputs are in use.

Yeah, and here is another notification to the audio driver demanded by
the HD audio spec.

Thanks,
Fengguang
---
Subject: drm/i915: hot plug/remove notification to HDMI audio driver
Date: Fri Nov 11 13:49:04 CST 2011
On monitor hot plug/unplug, 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.

After intel_dp_detect() knows whether the monitor is plugged or
removed, it will call intel_dp_hotplug_audio() to notify the audio
driver of the event.

It's noticed that bare metal 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 intel_dp_hotplug_audio().

The call sequence on hot plug is

- KMS console, full blown X (eg. gnome desktop)
->detect
drm_edid_to_eld
->mode_set
intel_write_eld
set SDVO_AUDIO_ENABLE/DP_AUDIO_OUTPUT_ENABLE
- bare metal X (eg. fluxbox)
->detect
drm_edid_to_eld
intel_dp_hotplug_audio()
intel_write_eld
set SDVO_AUDIO_ENABLE/DP_AUDIO_OUTPUT_ENABLE

On hot remove, the call sequence is

->detect
intel_dp_hotplug_audio()
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/i915/intel_dp.c | 47 ++++++++++++++++++++-------
drivers/gpu/drm/i915/intel_hdmi.c | 32 ++++++++++++++++++
drivers/gpu/drm/i915/intel_modes.c | 2 -
3 files changed, 68 insertions(+), 13 deletions(-)
--- linux.orig/drivers/gpu/drm/i915/intel_dp.c 2011-11-23 15:16:10.000000000 +0800
+++ linux/drivers/gpu/drm/i915/intel_dp.c 2011-11-23 16:20:25.000000000 +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"
@@ -1940,6 +1941,27 @@ intel_dp_get_edid_modes(struct drm_conne
return ret;
}

+static void intel_dp_hotplug_audio(struct drm_connector *connector,
+ enum drm_connector_status status)
+{
+ 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("hotplug status %d crtc %p eld %#x\n",
+ status, crtc, (unsigned int)connector->eld[0]);
+
+ if (status == connector_status_disconnected)
+ intel_dp->DP &= ~DP_AUDIO_OUTPUT_ENABLE;
+ else if (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);
+}

/**
* Uses CRT_HOTPLUG_EN and CRT_HOTPLUG_STAT to detect DP connection.
@@ -1968,20 +1990,23 @@ intel_dp_detect(struct drm_connector *co
intel_dp->dpcd[6], intel_dp->dpcd[7]);

if (status != connector_status_connected)
- return status;
+ goto out;

- 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);
}

- return connector_status_connected;
+ if (intel_dp->force_audio)
+ intel_dp->has_audio = intel_dp->force_audio > 0;
+out:
+ if (status != connector->status)
+ intel_dp_hotplug_audio(connector, status);
+
+ return status;
}

static int intel_dp_get_modes(struct drm_connector *connector)
--- linux.orig/drivers/gpu/drm/i915/intel_hdmi.c 2011-11-23 15:16:10.000000000 +0800
+++ linux/drivers/gpu/drm/i915/intel_hdmi.c 2011-11-23 16:20:25.000000000 +0800
@@ -319,6 +319,34 @@ static bool intel_hdmi_mode_fixup(struct
return true;
}

+static void intel_hdmi_hotplug_audio(struct drm_connector *connector,
+ enum drm_connector_status status)
+{
+ 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("hotplug status %d crtc %p eld %#x\n",
+ status, crtc, (unsigned int)connector->eld[0]);
+
+ if (status == connector_status_disconnected)
+ temp = I915_READ(intel_hdmi->sdvox_reg) & ~SDVO_AUDIO_ENABLE;
+ else if (status == connector_status_connected && crtc) {
+ /*
+ * It's for bare metal X (eg. fluxbox) only, which may not call
+ * ->mode_set on hot plug. KMS console and full blown X (eg.
+ * gnome desktop) will see NULL crtc at this time and 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 enum drm_connector_status
intel_hdmi_detect(struct drm_connector *connector, bool force)
{
@@ -337,6 +365,7 @@ 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);
@@ -347,6 +376,9 @@ intel_hdmi_detect(struct drm_connector *
intel_hdmi->has_audio = intel_hdmi->force_audio > 0;
}

+ if (status != connector->status)
+ intel_hdmi_hotplug_audio(connector, status);
+
return status;
}

--- linux.orig/drivers/gpu/drm/i915/intel_modes.c 2011-11-23 15:16:10.000000000 +0800
+++ linux/drivers/gpu/drm/i915/intel_modes.c 2011-11-23 15:16:11.000000000 +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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