[Intel-gfx] HDMI monitor hot remove handling
Wu Fengguang
fengguang.wu at intel.com
Mon Nov 14 03:54:02 CET 2011
On Mon, Nov 14, 2011 at 10:05:05AM +0800, Zhenyu Wang wrote:
> On 2011.11.11 16:50:41 +0800, Wu Fengguang wrote:
> > > > > I still think you should do those in hot_plug(), to call detect() for current
> > > > > status, write eld and set specific audio enable/disable bit for all audio stuff.
> > > > > Just my sense, you may send RFC patch for other's comment.
> >
> > > yeah, mode_set() will only be in normal mode setting path and taking current
> > > monitor's audio capability, but not on hot removal path. And if connector's DPMS off,
> > > does audio need to care? I think no, as user might still like to hear sound, right? ;)
> > >
> > > So looks currently nobody cares for hot removal, you need to set that by
> > > yourself somewhere.
> >
> > Zhenyu, according to your comments, here is the patch, tested OK on
> > HDMI :) DP not tested yet.
>
> Well, I don't think I suggested a new hook for hot removal. ;)
Yes, sorry.
> You know that hot_plug() hook is intel encoder thing, which is the place
> I think you can do audio config stuff.
The problem is, ->hot_plug() is called at the very beginning, before
->detect() is called. If doing the hot remove notifications in
->hot_plug(), the patch will add an _extra_ loop to call into
->detect().
Why not insert the functionalities somewhere after ->detect() is
called and we already know it's a hot removal event? That avoids
adding duplicate ->detect() calls.
Thanks,
Fengguang
> >
> > This notifies the audio driver of the HDMI/DP monitor hot removal
> > event.
> >
> > - clear SDVO_AUDIO_ENABLE/DP_AUDIO_OUTPUT_ENABLE
> > - clear ELD Valid bit
> >
> > Signed-off-by: Wu Fengguang <fengguang.wu at intel.com>
> > ---
> > drivers/gpu/drm/drm_crtc_helper.c | 4 ++++
> > drivers/gpu/drm/i915/intel_dp.c | 19 +++++++++++++++++++
> > drivers/gpu/drm/i915/intel_drv.h | 4 ++++
> > drivers/gpu/drm/i915/intel_hdmi.c | 17 +++++++++++++++++
> > include/drm/drm_crtc.h | 1 +
> > 5 files changed, 45 insertions(+)
> >
> > --- linux.orig/drivers/gpu/drm/i915/intel_dp.c 2011-11-11 16:42:58.000000000 +0800
> > +++ linux/drivers/gpu/drm/i915/intel_dp.c 2011-11-11 16:42:59.000000000 +0800
> > @@ -1984,6 +1984,24 @@ intel_dp_detect(struct drm_connector *co
> > return connector_status_connected;
> > }
> >
> > +static void intel_dp_hot_remove(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;
> > + struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
> > +
> > + intel_dp->DP &= ~DP_AUDIO_OUTPUT_ENABLE;
> > + I915_WRITE(intel_dp->output_reg, intel_dp->DP);
> > + POSTING_READ(intel_dp->output_reg);
> > + intel_wait_for_vblank(dev, intel_crtc->pipe);
> > +
> > + connector->eld[0] = 0;
> > + if (dev_priv->display.write_eld)
> > + dev_priv->display.write_eld(connector, crtc);
> > +}
> > +
> > static int intel_dp_get_modes(struct drm_connector *connector)
> > {
> > struct intel_dp *intel_dp = intel_attached_dp(connector);
> > @@ -2143,6 +2161,7 @@ static const struct drm_connector_funcs
> > .detect = intel_dp_detect,
> > .fill_modes = drm_helper_probe_single_connector_modes,
> > .set_property = intel_dp_set_property,
> > + .hot_remove = intel_dp_hot_remove,
> > .destroy = intel_dp_destroy,
> > };
> >
> > --- linux.orig/drivers/gpu/drm/i915/intel_drv.h 2011-11-11 16:42:58.000000000 +0800
> > +++ linux/drivers/gpu/drm/i915/intel_drv.h 2011-11-11 16:42:59.000000000 +0800
> > @@ -382,6 +382,10 @@ extern void intel_fb_restore_mode(struct
> > extern void intel_init_clock_gating(struct drm_device *dev);
> > extern void intel_write_eld(struct drm_encoder *encoder,
> > struct drm_display_mode *mode);
> > +extern void intel_hotplug_status(struct drm_device *dev,
> > + struct drm_connector *connector,
> > + struct drm_crtc *crtc,
> > + enum drm_connector_status status);
> > extern void intel_cpt_verify_modeset(struct drm_device *dev, int pipe);
> >
> > #endif /* __INTEL_DRV_H__ */
> > --- linux.orig/drivers/gpu/drm/i915/intel_hdmi.c 2011-11-11 16:42:58.000000000 +0800
> > +++ linux/drivers/gpu/drm/i915/intel_hdmi.c 2011-11-11 16:42:59.000000000 +0800
> > @@ -352,6 +352,22 @@ intel_hdmi_detect(struct drm_connector *
> > return status;
> > }
> >
> > +static void intel_hdmi_hot_remove(struct drm_connector *connector)
> > +{
> > + struct intel_hdmi *intel_hdmi = intel_attached_hdmi(connector);
> > + struct drm_i915_private *dev_priv = connector->dev->dev_private;
> > + u32 temp;
> > +
> > + temp = I915_READ(intel_hdmi->sdvox_reg);
> > + I915_WRITE(intel_hdmi->sdvox_reg, temp & ~SDVO_AUDIO_ENABLE);
> > + POSTING_READ(intel_hdmi->sdvox_reg);
> > +
> > + connector->eld[0] = 0;
> > + if (dev_priv->display.write_eld)
> > + dev_priv->display.write_eld(connector,
> > + intel_hdmi->base.base.crtc);
> > +}
> > +
> > static int intel_hdmi_get_modes(struct drm_connector *connector)
> > {
> > struct intel_hdmi *intel_hdmi = intel_attached_hdmi(connector);
> > @@ -461,6 +477,7 @@ static const struct drm_connector_funcs
> > .detect = intel_hdmi_detect,
> > .fill_modes = drm_helper_probe_single_connector_modes,
> > .set_property = intel_hdmi_set_property,
> > + .hot_remove = intel_hdmi_hot_remove,
> > .destroy = intel_hdmi_destroy,
> > };
> >
> > --- linux.orig/drivers/gpu/drm/drm_crtc_helper.c 2011-11-11 16:42:58.000000000 +0800
> > +++ linux/drivers/gpu/drm/drm_crtc_helper.c 2011-11-11 16:42:59.000000000 +0800
> > @@ -907,6 +907,10 @@ static void output_poll_execute(struct w
> > old_status, connector->status);
> > if (old_status != connector->status)
> > changed = true;
> > + if (old_status == connector_status_connected &&
> > + connector->status == connector_status_disconnected)
> > + connector->funcs->hot_remove(connector);
> > +
> > }
> >
> > mutex_unlock(&dev->mode_config.mutex);
> > --- linux.orig/include/drm/drm_crtc.h 2011-11-11 16:42:58.000000000 +0800
> > +++ linux/include/drm/drm_crtc.h 2011-11-11 16:42:59.000000000 +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 (*hot_remove)(struct drm_connector *connector);
> > void (*destroy)(struct drm_connector *connector);
> > void (*force)(struct drm_connector *connector);
> > };
>
> --
> Open Source Technology Center, Intel ltd.
>
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