[Intel-gfx] [v3 6/8] drm/i915/display: Implement infoframes readback for LSPCON

[Ville Syrjälä]

On Thu, Jun 11, 2020 at 12:42:30AM +0530, Uma Shankar wrote:
> Implemented Infoframes enabled readback for LSPCON devices.
> This will help align the implementation with state readback
> infrastructure.
> 
> Signed-off-by: Uma Shankar <uma.shankar at intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_lspcon.c | 63 ++++++++++++++++++++-
>  1 file changed, 61 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_lspcon.c b/drivers/gpu/drm/i915/display/intel_lspcon.c
> index 9034ce6f20b9..0ebe9a700291 100644
> --- a/drivers/gpu/drm/i915/display/intel_lspcon.c
> +++ b/drivers/gpu/drm/i915/display/intel_lspcon.c
> @@ -576,11 +576,70 @@ void lspcon_set_infoframes(struct intel_encoder *encoder,
>  				  buf, ret);
>  }
>  
> +static bool _lspcon_read_avi_infoframe_enabled_mca(struct drm_dp_aux *aux)
> +{
> +	int ret;
> +	u32 val = 0;
> +	u16 reg = LSPCON_MCA_AVI_IF_CTRL;
> +
> +	ret = drm_dp_dpcd_read(aux, reg, &val, 1);
> +	if (ret < 0) {
> +		DRM_ERROR("DPCD read failed, address 0x%x\n", reg);
> +		return false;
> +	}
> +
> +	if (val & LSPCON_MCA_AVI_IF_KICKOFF)
> +		return true;
> +
> +	return false;

return val & ...;

> +}
> +
> +static bool _lspcon_read_avi_infoframe_enabled_parade(struct drm_dp_aux *aux)
> +{
> +	int ret;
> +	u32 val = 0;
> +	u16 reg = LSPCON_PARADE_AVI_IF_CTRL;
> +
> +	ret = drm_dp_dpcd_read(aux, reg, &val, 1);
> +	if (ret < 0) {
> +		DRM_ERROR("DPCD read failed, address 0x%x\n", reg);
> +		return false;
> +	}
> +
> +	if (val & LSPCON_PARADE_AVI_IF_KICKOFF)
> +		return true;
> +
> +	return false;
> +}
> +
>  u32 lspcon_infoframes_enabled(struct intel_encoder *encoder,
>  			      const struct intel_crtc_state *pipe_config)
>  {
> -	/* FIXME actually read this from the hw */
> -	return 0;
> +	struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
> +	struct intel_lspcon *lspcon = enc_to_intel_lspcon(encoder);
> +	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
> +	bool infoframes_enabled;
> +	u32 mask = 0;
> +	u32 val;
> +
> +	if (lspcon->vendor == LSPCON_VENDOR_MCA)
> +		infoframes_enabled = _lspcon_read_avi_infoframe_enabled_mca(&intel_dp->aux);
> +	else
> +		infoframes_enabled = _lspcon_read_avi_infoframe_enabled_parade(&intel_dp->aux);
> +
> +	if (infoframes_enabled)
> +		return true;

This is supposed to return a bitmask of all enabled infoframes.

Also my question "how do we turn off infoframes once enabled?"
from https://patchwork.freedesktop.org/patch/351719/?series=72928&rev=1
still remains unanswered...

> +
> +	if (lspcon->hdr_supported) {
> +		val = intel_de_read(dev_priv,
> +				    HSW_TVIDEO_DIP_CTL(pipe_config->cpu_transcoder));
> +		mask |= VIDEO_DIP_ENABLE_GMP_HSW;
> +
> +		if (val & mask)
> +			return val & mask;
> +	}
> +
> +	return false;
>  }
>  
>  void lspcon_resume(struct intel_lspcon *lspcon)
> -- 
> 2.22.0

-- 
Ville Syrjälä
Intel