Xingchao,
We have the drm_i915_display_funcs.write_eld() for such
functionalities.
Thanks,
Fengguang
On Wed, Sep 05, 2012 at 01:06:16PM +0800, Wang Xingchao wrote:
> ELD infomation should update immediately when detected HDMI hot plug event.
> The related ELD_VALID bit should be set/clear to generate unsolicited event
> to notify Alsa driver this change.
>
> Signed-off-by: Wang Xingchao <xingchao.wang at intel.com>
> ---
> drivers/gpu/drm/i915/intel_hdmi.c | 28 ++++++++++++++++++++++++++++
> 1 file changed, 28 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
> index e4c37bb..1d9aaa9 100644
> --- a/drivers/gpu/drm/i915/intel_hdmi.c
> +++ b/drivers/gpu/drm/i915/intel_hdmi.c
> @@ -719,6 +719,10 @@ intel_hdmi_detect(struct drm_connector *connector, bool force)
> struct drm_i915_private *dev_priv = connector->dev->dev_private;
> struct edid *edid;
> enum drm_connector_status status = connector_status_disconnected;
> + enum drm_connector_status old_status = connector->status;
> + int aud_cntrl_st2;
> + uint32_t eldv;
> + int i;
>
> if (IS_G4X(connector->dev) && !g4x_hdmi_connected(intel_hdmi))
> return status;
> @@ -747,6 +751,30 @@ intel_hdmi_detect(struct drm_connector *connector, bool force)
> (intel_hdmi->force_audio == HDMI_AUDIO_ON);
> }
>
> + if (status != old_status) {
> + if (HAS_PCH_IBX(connector->dev))
> + aud_cntrl_st2 = IBX_AUD_CNTL_ST2;
> + else if (IS_HASWELL(connector->dev))
> + aud_cntrl_st2 = HSW_AUD_PIN_ELD_CP_VLD;
> + else
> + aud_cntrl_st2 = CPT_AUD_CNTRL_ST2;
> +
> + eldv = (AUDIO_ELD_VALID_A |
> + AUDIO_ELD_VALID_B |
> + AUDIO_ELD_VALID_C) ;
> + if (status == connector_status_connected) {
> + DRM_DEBUG_KMS("[CONNECTOR:%d:%s] Pluged In\n", connector->base.id,
> + drm_get_connector_name(connector));
> + I915_WRITE(aud_cntrl_st2, eldv);
> + } else {
> + i = I915_READ(aud_cntrl_st2);
> + i &= ~eldv;
> + I915_WRITE(aud_cntrl_st2, i);
> + DRM_DEBUG_KMS("[CONNECTOR:%d:%s] Pluged Out\n", connector->base.id,
> + drm_get_connector_name(connector));
> + }
> + }
> +
> return status;
> }
>
> --
> 1.7.9.5
