[Intel-gfx] [PATCH] drm/i915: HDMI/DP - ELD info refresh support for Haswell

[Rodrigo Vivi]

Hi Wang,

I would prefer to use defined HSW_AUD_PIN_ELD_CP_VLD directly at
read/write macros instead of creating an variable aud_cntrl_st2.
But this is minor, the other question I have here, why are you doing
this only for pipe A instead of pipe in use?

On Mon, Jan 7, 2013 at 3:20 AM, Wang Xingchao <xingchao.wang at intel.com> wrote:
> ELD info should be updated dynamically according to hot plug event.
> For haswell chip, clear/set the eld valid bit and output enable bit
> from callback intel_disable/eanble_ddi().
>
> Signed-off-by: Wang Xingchao <xingchao.wang at intel.com>
> ---
>  drivers/gpu/drm/i915/intel_ddi.c |   20 ++++++++++++++++++++
>  1 file changed, 20 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
> index f02b3fe..a80125f 100644
> --- a/drivers/gpu/drm/i915/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/intel_ddi.c
> @@ -1274,10 +1274,15 @@ static void intel_ddi_post_disable(struct intel_encoder *intel_encoder)
>  static void intel_enable_ddi(struct intel_encoder *intel_encoder)
>  {
>         struct drm_encoder *encoder = &intel_encoder->base;
> +       struct drm_crtc *crtc = encoder->crtc;
> +       struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
> +       int pipe = intel_crtc->pipe;
>         struct drm_device *dev = encoder->dev;
>         struct drm_i915_private *dev_priv = dev->dev_private;
>         enum port port = intel_ddi_get_encoder_port(intel_encoder);
>         int type = intel_encoder->type;
> +       int aud_cntrl_st2 = HSW_AUD_PIN_ELD_CP_VLD;
> +       int tmp;
>
>         if (type == INTEL_OUTPUT_HDMI) {
>                 /* In HDMI/DVI mode, the port width, and swing/emphasis values
> @@ -1290,18 +1295,33 @@ static void intel_enable_ddi(struct intel_encoder *intel_encoder)
>
>                 ironlake_edp_backlight_on(intel_dp);
>         }
> +
> +       tmp = I915_READ(aud_cntrl_st2);
> +       tmp |= ((AUDIO_OUTPUT_ENABLE_A | AUDIO_ELD_VALID_A) << (pipe * 4));
> +       I915_WRITE(aud_cntrl_st2, tmp);
>  }
>
>  static void intel_disable_ddi(struct intel_encoder *intel_encoder)
>  {
>         struct drm_encoder *encoder = &intel_encoder->base;
> +       struct drm_crtc *crtc = encoder->crtc;
> +       struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
> +       int pipe = intel_crtc->pipe;
>         int type = intel_encoder->type;
> +       int aud_cntrl_st2 = HSW_AUD_PIN_ELD_CP_VLD;
> +       struct drm_device *dev = encoder->dev;
> +       struct drm_i915_private *dev_priv = dev->dev_private;
> +       int tmp;
>
>         if (type == INTEL_OUTPUT_EDP) {
>                 struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
>
>                 ironlake_edp_backlight_off(intel_dp);
>         }
> +
> +       tmp = I915_READ(aud_cntrl_st2);
> +       tmp &= ~((AUDIO_OUTPUT_ENABLE_A | AUDIO_ELD_VALID_A) << (pipe * 4));
> +       I915_WRITE(aud_cntrl_st2, tmp);
>  }
>
>  int intel_ddi_get_cdclk_freq(struct drm_i915_private *dev_priv)
> --
> 1.7.9.5
>
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-- 
Rodrigo Vivi
Blog: http://blog.vivi.eng.br