Re: [PATCH] drm/i915: Per-DDI I_boost override

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Looks good.

Reviewed-by: David Weinehall <david.weinehall@xxxxxxxxxxxxxxx>

On Thu, Jun 18, 2015 at 02:23:37PM +0300, Antti Koskipaa wrote:
> An OEM may request increased I_boost beyond the recommended values
> by specifying an I_boost value to be applied to all swing entries for
> a port. These override values are specified in VBT.
> 
> Issue: VIZ-5676
> Signed-off-by: Antti Koskipaa <antti.koskipaa@xxxxxxxxxxxxxxx>
> ---
>  drivers/gpu/drm/i915/i915_drv.h   |  3 +++
>  drivers/gpu/drm/i915/intel_bios.c | 21 +++++++++++++++++++++
>  drivers/gpu/drm/i915/intel_bios.h |  9 +++++++++
>  drivers/gpu/drm/i915/intel_ddi.c  | 39 +++++++++++++++++++++++++++++++--------
>  4 files changed, 64 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 09a57a5..e17fd56 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -1402,6 +1402,9 @@ struct ddi_vbt_port_info {
>  	uint8_t supports_dvi:1;
>  	uint8_t supports_hdmi:1;
>  	uint8_t supports_dp:1;
> +
> +	uint8_t dp_boost_level;
> +	uint8_t hdmi_boost_level;
>  };
>  
>  enum psr_lines_to_wait {
> diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios.c
> index 198fc3c..06b5dc3 100644
> --- a/drivers/gpu/drm/i915/intel_bios.c
> +++ b/drivers/gpu/drm/i915/intel_bios.c
> @@ -946,6 +946,17 @@ err:
>  	memset(dev_priv->vbt.dsi.sequence, 0, sizeof(dev_priv->vbt.dsi.sequence));
>  }
>  
> +static u8 translate_iboost(u8 val)
> +{
> +	static const u8 mapping[] = { 1, 3, 7 }; /* See VBT spec */
> +
> +	if (val >= ARRAY_SIZE(mapping)) {
> +		DRM_DEBUG_KMS("Unsupported I_boost value found in VBT (%d), display may not work properly\n", val);
> +		return 0;
> +	}
> +	return mapping[val];
> +}
> +
>  static void parse_ddi_port(struct drm_i915_private *dev_priv, enum port port,
>  			   const struct bdb_header *bdb)
>  {
> @@ -1046,6 +1057,16 @@ static void parse_ddi_port(struct drm_i915_private *dev_priv, enum port port,
>  			      hdmi_level_shift);
>  		info->hdmi_level_shift = hdmi_level_shift;
>  	}
> +
> +	/* Parse the I_boost config for SKL and above */
> +	if (bdb->version >= 196 && (child->common.flags_1 & IBOOST_ENABLE)) {
> +		info->dp_boost_level = translate_iboost(child->common.iboost_level & 0xF);
> +		DRM_DEBUG_KMS("VBT (e)DP boost level for port %c: %d\n",
> +			      port_name(port), info->dp_boost_level);
> +		info->hdmi_boost_level = translate_iboost(child->common.iboost_level >> 4);
> +		DRM_DEBUG_KMS("VBT HDMI boost level for port %c: %d\n",
> +			      port_name(port), info->hdmi_boost_level);
> +	}
>  }
>  
>  static void parse_ddi_ports(struct drm_i915_private *dev_priv,
> diff --git a/drivers/gpu/drm/i915/intel_bios.h b/drivers/gpu/drm/i915/intel_bios.h
> index af0b476..8edd75c 100644
> --- a/drivers/gpu/drm/i915/intel_bios.h
> +++ b/drivers/gpu/drm/i915/intel_bios.h
> @@ -231,6 +231,10 @@ struct old_child_dev_config {
>  /* This one contains field offsets that are known to be common for all BDB
>   * versions. Notice that the meaning of the contents contents may still change,
>   * but at least the offsets are consistent. */
> +
> +/* Definitions for flags_1 */
> +#define IBOOST_ENABLE (1<<3)
> +
>  struct common_child_dev_config {
>  	u16 handle;
>  	u16 device_type;
> @@ -239,8 +243,13 @@ struct common_child_dev_config {
>  	u8 not_common2[2];
>  	u8 ddc_pin;
>  	u16 edid_ptr;
> +	u8 obsolete;
> +	u8 flags_1;
> +	u8 not_common3[13];
> +	u8 iboost_level;
>  } __packed;
>  
> +
>  /* This field changes depending on the BDB version, so the most reliable way to
>   * read it is by checking the BDB version and reading the raw pointer. */
>  union child_device_config {
> diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
> index 3abcb43..8e5e94c 100644
> --- a/drivers/gpu/drm/i915/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/intel_ddi.c
> @@ -434,6 +434,7 @@ static void intel_prepare_ddi_buffers(struct drm_device *dev, enum port port,
>  {
>  	struct drm_i915_private *dev_priv = dev->dev_private;
>  	u32 reg;
> +	u32 iboost_bit = 0;
>  	int i, n_hdmi_entries, n_dp_entries, n_edp_entries, hdmi_default_entry,
>  	    size;
>  	int hdmi_level = dev_priv->vbt.ddi_port_info[port].hdmi_level_shift;
> @@ -459,6 +460,10 @@ static void intel_prepare_ddi_buffers(struct drm_device *dev, enum port port,
>  		ddi_translations_hdmi =
>  				skl_get_buf_trans_hdmi(dev, &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)) {
>  		ddi_translations_fdi = bdw_ddi_translations_fdi;
>  		ddi_translations_dp = bdw_ddi_translations_dp;
> @@ -519,7 +524,7 @@ static void intel_prepare_ddi_buffers(struct drm_device *dev, enum port port,
>  	}
>  
>  	for (i = 0, reg = DDI_BUF_TRANS(port); i < size; i++) {
> -		I915_WRITE(reg, ddi_translations[i].trans1);
> +		I915_WRITE(reg, ddi_translations[i].trans1 | iboost_bit);
>  		reg += 4;
>  		I915_WRITE(reg, ddi_translations[i].trans2);
>  		reg += 4;
> @@ -534,7 +539,7 @@ static void intel_prepare_ddi_buffers(struct drm_device *dev, enum port port,
>  		hdmi_level = hdmi_default_entry;
>  
>  	/* Entry 9 is for HDMI: */
> -	I915_WRITE(reg, ddi_translations_hdmi[hdmi_level].trans1);
> +	I915_WRITE(reg, ddi_translations_hdmi[hdmi_level].trans1 | iboost_bit);
>  	reg += 4;
>  	I915_WRITE(reg, ddi_translations_hdmi[hdmi_level].trans2);
>  	reg += 4;
> @@ -1978,18 +1983,36 @@ void skl_ddi_set_iboost(struct drm_device *dev, u32 level,
>  	struct drm_i915_private *dev_priv = dev->dev_private;
>  	const struct ddi_buf_trans *ddi_translations;
>  	uint8_t iboost;
> +	uint8_t dp_iboost, hdmi_iboost;
>  	int n_entries;
>  	u32 reg;
> +	u32 iboost_bit = 0;
> +
> +	/* VBT may override standard boost values */
> +	dp_iboost = dev_priv->vbt.ddi_port_info[port].dp_boost_level;
> +	hdmi_iboost = dev_priv->vbt.ddi_port_info[port].hdmi_boost_level;
>  
>  	if (type == INTEL_OUTPUT_DISPLAYPORT) {
> -		ddi_translations = skl_get_buf_trans_dp(dev, &n_entries);
> -		iboost = ddi_translations[port].i_boost;
> +		if (dp_iboost) {
> +			iboost = dp_iboost;
> +		} else {
> +			ddi_translations = skl_get_buf_trans_dp(dev, &n_entries);
> +			iboost = ddi_translations[port].i_boost;
> +		}
>  	} else if (type == INTEL_OUTPUT_EDP) {
> -		ddi_translations = skl_get_buf_trans_edp(dev, &n_entries);
> -		iboost = ddi_translations[port].i_boost;
> +		if (dp_iboost) {
> +			iboost = dp_iboost;
> +		} else {
> +			ddi_translations = skl_get_buf_trans_edp(dev, &n_entries);
> +			iboost = ddi_translations[port].i_boost;
> +		}
>  	} else if (type == INTEL_OUTPUT_HDMI) {
> -		ddi_translations = skl_get_buf_trans_hdmi(dev, &n_entries);
> -		iboost = ddi_translations[port].i_boost;
> +		if (hdmi_iboost) {
> +			iboost = hdmi_iboost;
> +		} else {
> +			ddi_translations = skl_get_buf_trans_hdmi(dev, &n_entries);
> +			iboost = ddi_translations[port].i_boost;
> +		}
>  	} else {
>  		return;
>  	}
> -- 
> 1.8.3.2
> 
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