Re: [PATCH v2] drm/i915/bios: add DP max link rate to VBT child device struct

["Ville Syrjälä" <ville.syrjala@linux.intel.com>]

On Thu, Jan 18, 2018 at 05:33:10PM +0200, Jani Nikula wrote:
> Update VBT defs to reflect revision 216. While at it, default the
> expected child device struct size to sizeof the size rather than a
> hardcoded value.
> 
> v2: Fix bit order (David)
> 
> Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
> Signed-off-by: Jani Nikula <jani.nikula@intel.com>
> ---
>  drivers/gpu/drm/i915/intel_bios.c     | 8 +++++---
>  drivers/gpu/drm/i915/intel_vbt_defs.h | 2 ++
>  2 files changed, 7 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios.c
> index 51108ffc28d1..b820d595ebc8 100644
> --- a/drivers/gpu/drm/i915/intel_bios.c
> +++ b/drivers/gpu/drm/i915/intel_bios.c
> @@ -1323,11 +1323,13 @@ parse_general_definitions(struct drm_i915_private *dev_priv,
>  		expected_size = LEGACY_CHILD_DEVICE_CONFIG_SIZE;
>  	} else if (bdb->version == 195) {
>  		expected_size = 37;
> -	} else if (bdb->version <= 197) {
> +	} else if (bdb->version <= 215) {
>  		expected_size = 38;
> +	} else if (bdb->version <= 216) {
> +		expected_size = 39;
>  	} else {
> -		expected_size = 38;
> -		BUILD_BUG_ON(sizeof(*child) < 38);
> +		expected_size = sizeof(*child);
> +		BUILD_BUG_ON(sizeof(*child) < 39);
>  		DRM_DEBUG_DRIVER("Expected child device config size for VBT version %u not known; assuming %u\n",
>  				 bdb->version, expected_size);
>  	}
> diff --git a/drivers/gpu/drm/i915/intel_vbt_defs.h b/drivers/gpu/drm/i915/intel_vbt_defs.h
> index e3d7745a9151..98dff6058d3c 100644
> --- a/drivers/gpu/drm/i915/intel_vbt_defs.h
> +++ b/drivers/gpu/drm/i915/intel_vbt_defs.h
> @@ -412,6 +412,8 @@ struct child_device_config {
>  	u16 dp_gpio_pin_num;					/* 195 */
>  	u8 dp_iboost_level:4;					/* 196 */
>  	u8 hdmi_iboost_level:4;					/* 196 */
> +	u8 dp_max_link_rate:2;					/* 216 CNL+ */

BTW is someone going to actually hook this up?

> +	u8 dp_max_link_rate_reserved:6;				/* 216 */
>  } __packed;
>  
>  struct bdb_general_definitions {
> -- 
> 2.11.0
> 
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-- 
Ville Syrjälä
Intel OTC
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