[Intel-gfx] [PATCH 07/15] drm/i915: Add BUILD_BUG_ON()s for DDI translation table sizes

[Daniel Vetter]

On Tue, Dec 08, 2015 at 07:59:42PM +0200, ville.syrjala at linux.intel.com wrote:
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> 
> The DDI translation tables are supposed to be of certain size,
> so let's add some compile time asserts to enforce that..
> 
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>

Not sure this is worth it really. Next patch seems more valuable. Not
against it, but imo needs someone to really rave about it.
-Daniel

> ---
>  drivers/gpu/drm/i915/intel_ddi.c | 15 +++++++++++++++
>  1 file changed, 15 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
> index 5d0b03d6d388..838cbbe33517 100644
> --- a/drivers/gpu/drm/i915/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/intel_ddi.c
> @@ -351,6 +351,10 @@ intel_dig_port_supports_hdmi(const struct intel_digital_port *intel_dig_port)
>  static const struct ddi_buf_trans *
>  skl_get_buf_trans_dp(struct drm_i915_private *dev_priv, int *n_entries)
>  {
> +	BUILD_BUG_ON(ARRAY_SIZE(skl_y_ddi_translations_dp) != 9);
> +	BUILD_BUG_ON(ARRAY_SIZE(skl_u_ddi_translations_dp) != 9);
> +	BUILD_BUG_ON(ARRAY_SIZE(skl_ddi_translations_dp) != 9);
> +
>  	if (IS_SKL_ULX(dev_priv)) {
>  		*n_entries = ARRAY_SIZE(skl_y_ddi_translations_dp);
>  		return skl_y_ddi_translations_dp;
> @@ -366,6 +370,10 @@ skl_get_buf_trans_dp(struct drm_i915_private *dev_priv, int *n_entries)
>  static const struct ddi_buf_trans *
>  skl_get_buf_trans_edp(struct drm_i915_private *dev_priv, int *n_entries)
>  {
> +	BUILD_BUG_ON(ARRAY_SIZE(skl_y_ddi_translations_edp) != 10);
> +	BUILD_BUG_ON(ARRAY_SIZE(skl_u_ddi_translations_edp) != 10);
> +	BUILD_BUG_ON(ARRAY_SIZE(skl_ddi_translations_edp) != 10);
> +
>  	if (dev_priv->edp_low_vswing) {
>  		if (IS_SKL_ULX(dev_priv)) {
>  			*n_entries = ARRAY_SIZE(skl_y_ddi_translations_edp);
> @@ -436,6 +444,10 @@ static void intel_prepare_ddi_buffers(struct drm_i915_private *dev_priv,
>  		    dev_priv->vbt.ddi_port_info[port].dp_boost_level)
>  			iboost_bit = 1<<31;
>  	} else if (IS_BROADWELL(dev_priv)) {
> +		BUILD_BUG_ON(ARRAY_SIZE(bdw_ddi_translations_fdi) != 9);
> +		BUILD_BUG_ON(ARRAY_SIZE(bdw_ddi_translations_dp) != 9);
> +		BUILD_BUG_ON(ARRAY_SIZE(bdw_ddi_translations_edp) != 9);
> +
>  		ddi_translations_fdi = bdw_ddi_translations_fdi;
>  		ddi_translations_dp = bdw_ddi_translations_dp;
>  		ddi_translations_edp = bdw_ddi_translations_edp;
> @@ -445,6 +457,9 @@ static void intel_prepare_ddi_buffers(struct drm_i915_private *dev_priv,
>  		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);
> +
>  		ddi_translations_fdi = hsw_ddi_translations_fdi;
>  		ddi_translations_dp = hsw_ddi_translations_dp;
>  		ddi_translations_edp = hsw_ddi_translations_dp;
> -- 
> 2.4.10
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch