Re: [PATCH v2 07/10] drm/i915/xe3lpd: Add C20 Phy consolidated programming table

[Matt Roper <matthew.d.roper@intel.com>]

On Thu, Oct 10, 2024 at 03:43:08PM -0700, Matt Atwood wrote:
> From: Suraj Kandpal <suraj.kandpal@intel.com>
> 
> From DISPLAY_VER() >= 30 C20 PHY consolidated programming table of
> DP and eDP been merged and now use the same rates and values. eDP
> over TypeC has also been introduced.
> Moreover it allows more granular and higher rates. Add new table to
> represent this change.
> 
> Bspec: 68961
> Signed-off-by: Suraj Kandpal <suraj.kandpal@intel.com>
> Signed-off-by: Matt Atwood <matthew.s.atwood@intel.com>
> Reviewed-by: Clint Taylor <Clinton.A.Taylor@intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_cx0_phy.c | 24 ++++++++++++++++++--
>  1 file changed, 22 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_cx0_phy.c b/drivers/gpu/drm/i915/display/intel_cx0_phy.c
> index f73d576fd99e..f1aea5ead41b 100644
> --- a/drivers/gpu/drm/i915/display/intel_cx0_phy.c
> +++ b/drivers/gpu/drm/i915/display/intel_cx0_phy.c
> @@ -1122,6 +1122,22 @@ static const struct intel_c20pll_state * const xe2hpd_c20_dp_tables[] = {
>  	NULL,
>  };
>  
> +static const struct intel_c20pll_state * const xe3lpd_c20_dp_edp_tables[] = {
> +	&mtl_c20_dp_rbr,
> +	&xe2hpd_c20_edp_r216,
> +	&xe2hpd_c20_edp_r243,
> +	&mtl_c20_dp_hbr1,
> +	&xe2hpd_c20_edp_r324,
> +	&xe2hpd_c20_edp_r432,
> +	&mtl_c20_dp_hbr2,
> +	&xe2hpd_c20_edp_r675,
> +	&mtl_c20_dp_hbr3,
> +	&mtl_c20_dp_uhbr10,
> +	&xe2hpd_c20_dp_uhbr13_5,
> +	&mtl_c20_dp_uhbr20,
> +	NULL,
> +};
> +
>  /*
>   * HDMI link rates with 38.4 MHz reference clock.
>   */
> @@ -2242,11 +2258,15 @@ intel_c20_pll_tables_get(struct intel_crtc_state *crtc_state,
>  	struct drm_i915_private *i915 = to_i915(encoder->base.dev);
>  
>  	if (intel_crtc_has_dp_encoder(crtc_state)) {
> -		if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_EDP))
> -			return xe2hpd_c20_edp_tables;
> +		if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_EDP)) {
> +			if (DISPLAY_VER_FULL(i915) == IP_VER(14, 1))

It might be a bit simpler to && the conditions here instead of nesting
if's.

> +				return xe2hpd_c20_edp_tables;
> +		}
>  
>  		if (DISPLAY_VER_FULL(i915) == IP_VER(14, 1))
>  			return xe2hpd_c20_dp_tables;
> +		else if (DISPLAY_VER(i915) >= 30)

Shouldn't this ladder be using the standard "newest platform first"
ordering?


Matt

> +			return xe3lpd_c20_dp_edp_tables;
>  		else
>  			return mtl_c20_dp_tables;
>  
> -- 
> 2.45.0
> 

-- 
Matt Roper
Graphics Software Engineer
Linux GPU Platform Enablement
Intel Corporation