Re: [Intel-gfx] [PATCH v4] drm/i915/vbt: update DP max link rate table

From: "Ville Syrjälä" <ville.syrjala@linux.intel.com>
To: Lee Shawn C <shawn.c.lee@intel.com>
Cc: Cooper Chiou <cooper.chiou@intel.com>,
	intel-gfx@lists.freedesktop.org,
	William Tseng <william.tseng@intel.com>
Subject: Re: [Intel-gfx] [PATCH v4] drm/i915/vbt: update DP max link rate table
Date: Sat, 20 Feb 2021 12:23:26 +0200	[thread overview]
Message-ID: <YDDjHgrUpEyZbw+j@intel.com> (raw)
In-Reply-To: <20210218052333.16109-1-shawn.c.lee@intel.com>

On Thu, Feb 18, 2021 at 01:23:33PM +0800, Lee Shawn C wrote:
> According to Bspec #20124, max link rate table for DP was updated
> at BDB version 230. Max link rate can support upto UHBR.
> 
> After migrate to BDB v230, the definition for LBR, HBR2 and HBR3
> were changed. For backward compatibility. If BDB version was
> from 216 to 229. Driver have to follow original rule to configure
> DP max link rate value from VBT.
> 
> v2: split the mapping table to two for old and new BDB definition.
> v3: return link rate instead of assigning it.
> v4: remove the useless variable.
> 
> Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
> Cc: Imre Deak <imre.deak@intel.com>
> Cc: Jani Nikula <jani.nikula@linux.intel.com>
> Cc: Cooper Chiou <cooper.chiou@intel.com>
> Cc: William Tseng <william.tseng@intel.com>
> Signed-off-by: Lee Shawn C <shawn.c.lee@intel.com>
> ---
<snip>
> @@ -445,8 +456,8 @@ 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+ */
> -	u8 dp_max_link_rate_reserved:6;				/* 216 */
> +	u8 dp_max_link_rate:3;					/* 230 CNL+ */
> +	u8 dp_max_link_rate_reserved:5;				/* 230 */

I tweaked the comments here to say "216/230" to retain some hint
that version 216 already added some of this.

And now pushed. Thanks.

>  } __packed;
>  
>  struct bdb_general_definitions {
> -- 
> 2.17.1

-- 
Ville Syrjälä
Intel
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