[Intel-gfx] [PATCH] [VPG HSW-A] drm/i915:Added HDMI Audio codec disable sequence for HSW.

[Lin, Mengdong]

Hi Daniel and Mukesh,

This patch is submitted on behalf of Arora Mukesh. Please have a review.

And the 2nd version of patch is also submitted with subject: [PATCH v2] drm/i915/hsw: Add display Audio codec disable sequence for Haswell. Please also have a review.
http://lists.freedesktop.org/archives/intel-gfx/2013-August/032488.html

In the new patch, I did some modification to this original patch, to apply to both HDMI and DP port:
- rename the function from hsw_hdmi_audio_disable() to intel_disable_audio()
- let intel_disable_ddi() call this new function for both HDMI and DP port.
- remove redundant device check, since only Haswell and its successors use DDI port operations in intel_ddi.c

Thanks
Mengdong

> -----Original Message-----
> From: intel-gfx-bounces+mengdong.lin=intel.com at lists.freedesktop.org
> [mailto:intel-gfx-bounces+mengdong.lin=intel.com at lists.freedesktop.org] On
> Behalf Of mengdong.lin at intel.com
> Sent: Friday, August 30, 2013 7:48 AM
> To: intel-gfx at lists.freedesktop.org
> Cc: Arora, MukeshX
> Subject: [Intel-gfx] [PATCH] [VPG HSW-A] drm/i915:Added HDMI Audio codec
> disable sequence for HSW.
> 
> From: Mukesh <mukeshx.arora at intel.com>
> 
> The code implements hsw_hdmi_audio_disable func which sets the relevant
> registers for disabling the audio codec in a call to intel_disable_ddi func.This
> audio codec disbale sequence is implemented as per the recommendation of
> the Bspec.
> 
> Change-Id: If6eefbfe5ef821db547c759caa9ff5dc18980738
> Signed-off-by: Mukesh Arora <mukeshx.arora at intel.com>
> ---
>  drivers/gpu/drm/i915/intel_ddi.c | 41
> ++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 41 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
> index 0de236e..2718d9a 100644
> --- a/drivers/gpu/drm/i915/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/intel_ddi.c
> @@ -1119,6 +1119,43 @@ static void intel_ddi_post_disable(struct
> intel_encoder *intel_encoder)
>  	I915_WRITE(PORT_CLK_SEL(port), PORT_CLK_SEL_NONE);  }
> 
> +/* Sets the registers for  audio codec disable sequence as
> +* mentioned in the Haswell Bspec.
> +*/
> +void hsw_hdmi_audio_disable(struct drm_encoder *encoder) {
> +	u32 temp;
> +	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
> +	struct drm_device *dev = encoder->dev;
> +	struct drm_i915_private *dev_priv = dev->dev_private;
> +	int aud_config = HSW_AUD_CFG(intel_crtc->pipe);
> +
> +	/* HDMI audio disable sequence for Haswell*/
> +	if (intel_crtc->eld_vld) {
> +		/* disable timestamps */
> +		temp = I915_READ(aud_config);
> +		/* write 0 for HDMI */
> +		temp &= ~AUD_CONFIG_N_VALUE_INDEX;
> +		/* Set N_programming_enable */
> +		temp |= AUD_CONFIG_N_PROG_ENABLE;
> +		/* Set Upper_N_value and Lower_N_value
> +		(bits 27:20, 15:4) to all "0"s */
> +		temp &=
> ~(AUD_CONFIG_UPPER_N_VALUE|AUD_CONFIG_LOWER_N_VALUE);
> +		I915_WRITE(aud_config, temp);
> +		/* Disable ELDV and ELD buffer */
> +		temp = I915_READ(HSW_AUD_PIN_ELD_CP_VLD);
> +		temp &= ~(AUDIO_ELD_VALID_A << (intel_crtc->pipe * 4));
> +		I915_WRITE(HSW_AUD_PIN_ELD_CP_VLD, temp);
> +		/* Wait for 2 vertical blanks */
> +		intel_wait_for_vblank(dev, intel_crtc->pipe);
> +		intel_wait_for_vblank(dev, intel_crtc->pipe);
> +		/* Disable audio PD. This is optional as per Bspec.  */
> +		temp = I915_READ(HSW_AUD_PIN_ELD_CP_VLD);
> +		temp &= ~(AUDIO_OUTPUT_ENABLE_A << (intel_crtc->pipe * 4));
> +		I915_WRITE(HSW_AUD_PIN_ELD_CP_VLD, temp);
> +	}
> +
> +}
>  static void intel_enable_ddi(struct intel_encoder *intel_encoder)  {
>  	struct drm_encoder *encoder = &intel_encoder->base; @@ -1173,6
> +1210,10 @@ static void intel_disable_ddi(struct intel_encoder
> *intel_encoder)
>  		tmp &= ~((AUDIO_OUTPUT_ENABLE_A | AUDIO_ELD_VALID_A) <<
>  			 (pipe * 4));
>  		I915_WRITE(HSW_AUD_PIN_ELD_CP_VLD, tmp);
> +		if (IS_HASWELL(dev) && (type == INTEL_OUTPUT_HDMI)) {
> +			/*HDMI audio codec disable sequence.	*/
> +			hsw_hdmi_audio_disable(encoder);
> +		}
>  	}
> 
>  	if (type == INTEL_OUTPUT_EDP) {
> --
> 1.8.1.2
> 
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