Re: [PATCH 12/15] drm/i915: Split DP/eDP/FDI and HDMI/DVI DDI buffer programming apart

[Daniel Vetter <daniel@ffwll.ch>]

On Tue, Dec 08, 2015 at 07:59:47PM +0200, ville.syrjala@linux.intel.com wrote:
> From: Ville Syrjälä <ville.syrjala@linux.intel.com>
> 
> DDI buffer prorgramming works quite differently depending on
> the mode of the DDI port (DP/eDP/FDI vs. HDMI/DVI). Let's split
> the function that does the programming into two matching variants
> as well.
> 
> Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
> ---
>  drivers/gpu/drm/i915/intel_ddi.c    | 94 ++++++++++++++++++++++---------------
>  drivers/gpu/drm/i915/intel_dp_mst.c |  4 +-
>  drivers/gpu/drm/i915/intel_drv.h    |  2 +-
>  3 files changed, 60 insertions(+), 40 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
> index f812607045d6..c47f45c0f4a2 100644
> --- a/drivers/gpu/drm/i915/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/intel_ddi.c
> @@ -397,37 +397,22 @@ skl_get_buf_trans_hdmi(struct drm_i915_private *dev_priv, int *n_entries)
>  
>  /*
>   * Starting with Haswell, DDI port buffers must be programmed with correct
> - * values in advance. The buffer values are different for FDI and DP modes,
> - * but the HDMI/DVI fields are shared among those. So we program the DDI
> - * in either FDI or DP modes only, as HDMI connections will work with both
> - * of those
> + * values in advance. This function programs the correct values for
> + * DP/eDP/FDI use cases.
>   */
> -void intel_prepare_ddi_buffers(struct intel_encoder *encoder)
> +void intel_prepare_dp_ddi_buffers(struct intel_encoder *encoder)
>  {
>  	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
>  	u32 iboost_bit = 0;
> -	int i, n_hdmi_entries, n_dp_entries, n_edp_entries, hdmi_default_entry,
> -	    size;
> -	int hdmi_level;
> -	enum port port;
> +	int i, n_dp_entries, n_edp_entries, size;
> +	enum port port = intel_ddi_get_encoder_port(encoder);
>  	const struct ddi_buf_trans *ddi_translations_fdi;
>  	const struct ddi_buf_trans *ddi_translations_dp;
>  	const struct ddi_buf_trans *ddi_translations_edp;
> -	const struct ddi_buf_trans *ddi_translations_hdmi;
>  	const struct ddi_buf_trans *ddi_translations;
>  
> -	port = intel_ddi_get_encoder_port(encoder);
> -	hdmi_level = dev_priv->vbt.ddi_port_info[port].hdmi_level_shift;
> -
> -	if (IS_BROXTON(dev_priv)) {
> -		if (encoder->type != INTEL_OUTPUT_HDMI)
> -			return;
> -
> -		/* Vswing programming for HDMI */
> -		bxt_ddi_vswing_sequence(dev_priv, hdmi_level, port,
> -					INTEL_OUTPUT_HDMI);
> +	if (IS_BROXTON(dev_priv))
>  		return;
> -	}
>  
>  	if (IS_SKYLAKE(dev_priv) || IS_KABYLAKE(dev_priv)) {
>  		ddi_translations_fdi = NULL;
> @@ -435,9 +420,6 @@ void intel_prepare_ddi_buffers(struct intel_encoder *encoder)
>  				skl_get_buf_trans_dp(dev_priv, &n_dp_entries);
>  		ddi_translations_edp =
>  				skl_get_buf_trans_edp(dev_priv, &n_edp_entries);
> -		ddi_translations_hdmi =
> -				skl_get_buf_trans_hdmi(dev_priv, &n_hdmi_entries);
> -		hdmi_default_entry = 8;
>  		/* If we're boosting the current, set bit 31 of trans1 */
>  		if (dev_priv->vbt.ddi_port_info[port].hdmi_boost_level ||
>  		    dev_priv->vbt.ddi_port_info[port].dp_boost_level)
> @@ -454,11 +436,8 @@ void intel_prepare_ddi_buffers(struct intel_encoder *encoder)
>  		ddi_translations_fdi = bdw_ddi_translations_fdi;
>  		ddi_translations_dp = bdw_ddi_translations_dp;
>  		ddi_translations_edp = bdw_ddi_translations_edp;
> -		ddi_translations_hdmi = bdw_ddi_translations_hdmi;
>  		n_edp_entries = ARRAY_SIZE(bdw_ddi_translations_edp);
>  		n_dp_entries = ARRAY_SIZE(bdw_ddi_translations_dp);
> -		n_hdmi_entries = ARRAY_SIZE(bdw_ddi_translations_hdmi);
> -		hdmi_default_entry = 7;
>  	} else if (IS_HASWELL(dev_priv)) {
>  		BUILD_BUG_ON(ARRAY_SIZE(hsw_ddi_translations_fdi) != 9);
>  		BUILD_BUG_ON(ARRAY_SIZE(hsw_ddi_translations_dp) != 9);
> @@ -466,20 +445,14 @@ void intel_prepare_ddi_buffers(struct intel_encoder *encoder)
>  		ddi_translations_fdi = hsw_ddi_translations_fdi;
>  		ddi_translations_dp = hsw_ddi_translations_dp;
>  		ddi_translations_edp = hsw_ddi_translations_dp;
> -		ddi_translations_hdmi = hsw_ddi_translations_hdmi;
>  		n_dp_entries = n_edp_entries = ARRAY_SIZE(hsw_ddi_translations_dp);
> -		n_hdmi_entries = ARRAY_SIZE(hsw_ddi_translations_hdmi);
> -		hdmi_default_entry = 6;
>  	} else {
>  		WARN(1, "ddi translation table missing\n");
>  		ddi_translations_edp = bdw_ddi_translations_dp;
>  		ddi_translations_fdi = bdw_ddi_translations_fdi;
>  		ddi_translations_dp = bdw_ddi_translations_dp;
> -		ddi_translations_hdmi = bdw_ddi_translations_hdmi;
>  		n_edp_entries = ARRAY_SIZE(bdw_ddi_translations_edp);
>  		n_dp_entries = ARRAY_SIZE(bdw_ddi_translations_dp);
> -		n_hdmi_entries = ARRAY_SIZE(bdw_ddi_translations_hdmi);
> -		hdmi_default_entry = 7;
>  	}
>  
>  	switch (encoder->type) {
> @@ -488,7 +461,6 @@ void intel_prepare_ddi_buffers(struct intel_encoder *encoder)
>  		size = n_edp_entries;
>  		break;
>  	case INTEL_OUTPUT_DISPLAYPORT:
> -	case INTEL_OUTPUT_HDMI:
>  		ddi_translations = ddi_translations_dp;
>  		size = n_dp_entries;
>  		break;
> @@ -506,10 +478,54 @@ void intel_prepare_ddi_buffers(struct intel_encoder *encoder)
>  		I915_WRITE(DDI_BUF_TRANS_HI(port, i),
>  			   ddi_translations[i].trans2);
>  	}
> +}
> +
> +/*
> + * Starting with Haswell, DDI port buffers must be programmed with correct
> + * values in advance. This function programs the correct values for
> + * HDMI/DVI use cases.
> + */
> +static void intel_prepare_hdmi_ddi_buffers(struct intel_encoder *encoder)
> +{
> +	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
> +	u32 iboost_bit = 0;
> +	int n_hdmi_entries, hdmi_default_entry, hdmi_level;
> +	enum port port = intel_ddi_get_encoder_port(encoder);
> +	const struct ddi_buf_trans *ddi_translations_hdmi;
>  
>  	if (encoder->type != INTEL_OUTPUT_HDMI)

WARN_ON?

>  		return;
>  
> +	hdmi_level = dev_priv->vbt.ddi_port_info[port].hdmi_level_shift;
> +
> +	if (IS_BROXTON(dev_priv)) {
> +		bxt_ddi_vswing_sequence(dev_priv, hdmi_level, port,
> +					INTEL_OUTPUT_HDMI);
> +		return;
> +	}
> +
> +	if (IS_SKYLAKE(dev_priv) || IS_KABYLAKE(dev_priv)) {
> +		ddi_translations_hdmi = skl_get_buf_trans_hdmi(dev_priv, &n_hdmi_entries);
> +		hdmi_default_entry = 8;
> +		/* If we're boosting the current, set bit 31 of trans1 */
> +		if (dev_priv->vbt.ddi_port_info[port].hdmi_boost_level ||
> +		    dev_priv->vbt.ddi_port_info[port].dp_boost_level)
> +			iboost_bit = 1<<31;
> +	} else if (IS_BROADWELL(dev_priv)) {
> +		ddi_translations_hdmi = bdw_ddi_translations_hdmi;
> +		n_hdmi_entries = ARRAY_SIZE(bdw_ddi_translations_hdmi);
> +		hdmi_default_entry = 7;
> +	} else if (IS_HASWELL(dev_priv)) {
> +		ddi_translations_hdmi = hsw_ddi_translations_hdmi;
> +		n_hdmi_entries = ARRAY_SIZE(hsw_ddi_translations_hdmi);
> +		hdmi_default_entry = 6;
> +	} else {
> +		WARN(1, "ddi translation table missing\n");
> +		ddi_translations_hdmi = bdw_ddi_translations_hdmi;
> +		n_hdmi_entries = ARRAY_SIZE(bdw_ddi_translations_hdmi);
> +		hdmi_default_entry = 7;
> +	}
> +
>  	/* Choose a good default if VBT is badly populated */
>  	if (hdmi_level == HDMI_LEVEL_SHIFT_UNKNOWN ||
>  	    hdmi_level >= n_hdmi_entries)
> @@ -555,7 +571,7 @@ void hsw_fdi_link_train(struct drm_crtc *crtc)
>  
>  	for_each_encoder_on_crtc(dev, crtc, encoder) {
>  		WARN_ON(encoder->type != INTEL_OUTPUT_ANALOG);
> -		intel_prepare_ddi_buffers(encoder);
> +		intel_prepare_dp_ddi_buffers(encoder);
>  	}
>  
>  	/* Set the FDI_RX_MISC pwrdn lanes and the 2 workarounds listed at the
> @@ -2376,8 +2392,6 @@ static void intel_ddi_pre_enable(struct intel_encoder *intel_encoder)
>  	enum port port = intel_ddi_get_encoder_port(intel_encoder);
>  	int type = intel_encoder->type;
>  
> -	intel_prepare_ddi_buffers(intel_encoder);
> -
>  	if (type == INTEL_OUTPUT_EDP) {
>  		struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
>  		intel_edp_panel_on(intel_dp);
> @@ -2388,6 +2402,8 @@ static void intel_ddi_pre_enable(struct intel_encoder *intel_encoder)
>  	if (type == INTEL_OUTPUT_DISPLAYPORT || type == INTEL_OUTPUT_EDP) {
>  		struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
>  
> +		intel_prepare_dp_ddi_buffers(intel_encoder);
> +
>  		intel_dp_set_link_params(intel_dp, crtc->config);
>  
>  		intel_ddi_init_dp_buf_reg(intel_encoder);
> @@ -2399,9 +2415,13 @@ static void intel_ddi_pre_enable(struct intel_encoder *intel_encoder)
>  	} else if (type == INTEL_OUTPUT_HDMI) {
>  		struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(encoder);
>  
> +		intel_prepare_hdmi_ddi_buffers(intel_encoder);
> +
>  		intel_hdmi->set_infoframes(encoder,
>  					   crtc->config->has_hdmi_sink,
>  					   &crtc->config->base.adjusted_mode);
> +	} else if (type == INTEL_OUTPUT_ANALOG) {
> +		intel_prepare_dp_ddi_buffers(intel_encoder);

Hm, I was hoping with an encoder split that we could use the vfunc hooks
instead of these massive if ladders everywhere ... too much trouble still?

Anyway, besides the WARN_ON request the patch looks correct, so with that
addressed Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
>  	}
>  }
>  
> diff --git a/drivers/gpu/drm/i915/intel_dp_mst.c b/drivers/gpu/drm/i915/intel_dp_mst.c
> index 73ac68e21b7e..d8e9b28bb2e0 100644
> --- a/drivers/gpu/drm/i915/intel_dp_mst.c
> +++ b/drivers/gpu/drm/i915/intel_dp_mst.c
> @@ -173,10 +173,10 @@ static void intel_mst_pre_enable_dp(struct intel_encoder *encoder)
>  	intel_mst->port = found->port;
>  
>  	if (intel_dp->active_mst_links == 0) {
> -		intel_prepare_ddi_buffers(&intel_dig_port->base);
> -
>  		intel_ddi_clk_select(&intel_dig_port->base, intel_crtc->config);
>  
> +		intel_prepare_dp_ddi_buffers(&intel_dig_port->base);
> +
>  		intel_dp_set_link_params(intel_dp, intel_crtc->config);
>  
>  		intel_ddi_init_dp_buf_reg(&intel_dig_port->base);
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index 9e5db3d71e12..f7ee4bc39b33 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -995,7 +995,7 @@ void intel_crt_init(struct drm_device *dev);
>  /* intel_ddi.c */
>  void intel_ddi_clk_select(struct intel_encoder *encoder,
>  			  const struct intel_crtc_state *pipe_config);
> -void intel_prepare_ddi_buffers(struct intel_encoder *encoder);
> +void intel_prepare_dp_ddi_buffers(struct intel_encoder *encoder);
>  void hsw_fdi_link_train(struct drm_crtc *crtc);
>  void intel_ddi_init(struct drm_device *dev, enum port port);
>  enum port intel_ddi_get_encoder_port(struct intel_encoder *intel_encoder);
> -- 
> 2.4.10
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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