[Intel-gfx] [PATCH v3 20/48] drm/i915/adl_p: Add cdclk support for ADL-P

[Kahola, Mika]

> -----Original Message-----
> From: Intel-gfx <intel-gfx-bounces at lists.freedesktop.org> On Behalf Of Matt
> Roper
> Sent: Saturday, May 8, 2021 5:28 AM
> To: intel-gfx at lists.freedesktop.org
> Subject: [Intel-gfx] [PATCH v3 20/48] drm/i915/adl_p: Add cdclk support for
> ADL-P
> 
> From: Anusha Srivatsa <anusha.srivatsa at intel.com>
> 
> ADL-P has 3 possible refclk frequencies: 19.2MHz, 24MHz and 38.4MHz
> 
> While we're at it, remove the drm_WARNs.  They've never actually helped us
> catch any problems, but it's very easy to forget to update them properly for
> new platforms.
> 
> BSpec: 55409, 49208
> Cc: Matt Roper <matthew.d.roper at intel.com>
> Cc: Clinton Taylor <clinton.a.taylor at intel.com>
> Cc: José Roberto de Souza <jose.souza at intel.com>
> Signed-off-by: Anusha Srivatsa <anusha.srivatsa at intel.com>
> Signed-off-by: Clinton Taylor <Clinton.A.Taylor at intel.com>
> Signed-off-by: Matt Roper <matthew.d.roper at intel.com>

Reviewed-by: Mika Kahola <mika.kahola at intel.com>

> ---
>  drivers/gpu/drm/i915/display/intel_cdclk.c | 41 +++++++++++++++-------
>  1 file changed, 28 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_cdclk.c
> b/drivers/gpu/drm/i915/display/intel_cdclk.c
> index 25ef077dc389..d40126061038 100644
> --- a/drivers/gpu/drm/i915/display/intel_cdclk.c
> +++ b/drivers/gpu/drm/i915/display/intel_cdclk.c
> @@ -1253,6 +1253,27 @@ static const struct intel_cdclk_vals
> rkl_cdclk_table[] = {
>  	{}
>  };
> 
> +static const struct intel_cdclk_vals adlp_cdclk_table[] = {
> +	{ .refclk = 19200, .cdclk = 172800, .divider = 3, .ratio = 27 },
> +	{ .refclk = 19200, .cdclk = 192000, .divider = 2, .ratio = 20 },
> +	{ .refclk = 19200, .cdclk = 307200, .divider = 2, .ratio = 32 },
> +	{ .refclk = 19200, .cdclk = 556800, .divider = 2, .ratio = 58 },
> +	{ .refclk = 19200, .cdclk = 652800, .divider = 2, .ratio = 68 },
> +
> +	{ .refclk = 24000, .cdclk = 176000, .divider = 3, .ratio = 22 },
> +	{ .refclk = 24000, .cdclk = 192000, .divider = 2, .ratio = 16 },
> +	{ .refclk = 24000, .cdclk = 312000, .divider = 2, .ratio = 26 },
> +	{ .refclk = 24000, .cdclk = 552000, .divider = 2, .ratio = 46 },
> +	{ .refclk = 24400, .cdclk = 648000, .divider = 2, .ratio = 54 },
> +
> +	{ .refclk = 38400, .cdclk = 179200, .divider = 3, .ratio = 14 },
> +	{ .refclk = 38400, .cdclk = 192000, .divider = 2, .ratio = 10 },
> +	{ .refclk = 38400, .cdclk = 307200, .divider = 2, .ratio = 16 },
> +	{ .refclk = 38400, .cdclk = 556800, .divider = 2, .ratio = 29 },
> +	{ .refclk = 38400, .cdclk = 652800, .divider = 2, .ratio = 34 },
> +	{}
> +};
> +
>  static int bxt_calc_cdclk(struct drm_i915_private *dev_priv, int min_cdclk)  {
>  	const struct intel_cdclk_vals *table = dev_priv->cdclk.table; @@ -
> 1428,18 +1449,12 @@ static void bxt_get_cdclk(struct drm_i915_private
> *dev_priv,
>  		div = 2;
>  		break;
>  	case BXT_CDCLK_CD2X_DIV_SEL_1_5:
> -		drm_WARN(&dev_priv->drm,
> -			 DISPLAY_VER(dev_priv) >= 10,
> -			 "Unsupported divider\n");
>  		div = 3;
>  		break;
>  	case BXT_CDCLK_CD2X_DIV_SEL_2:
>  		div = 4;
>  		break;
>  	case BXT_CDCLK_CD2X_DIV_SEL_4:
> -		drm_WARN(&dev_priv->drm,
> -			 DISPLAY_VER(dev_priv) >= 11 ||
> IS_CANNONLAKE(dev_priv),
> -			 "Unsupported divider\n");
>  		div = 8;
>  		break;
>  	default:
> @@ -1550,16 +1565,10 @@ static u32 bxt_cdclk_cd2x_div_sel(struct
> drm_i915_private *dev_priv,
>  	case 2:
>  		return BXT_CDCLK_CD2X_DIV_SEL_1;
>  	case 3:
> -		drm_WARN(&dev_priv->drm,
> -			 DISPLAY_VER(dev_priv) >= 10,
> -			 "Unsupported divider\n");
>  		return BXT_CDCLK_CD2X_DIV_SEL_1_5;
>  	case 4:
>  		return BXT_CDCLK_CD2X_DIV_SEL_2;
>  	case 8:
> -		drm_WARN(&dev_priv->drm,
> -			 DISPLAY_VER(dev_priv) >= 11 ||
> IS_CANNONLAKE(dev_priv),
> -			 "Unsupported divider\n");
>  		return BXT_CDCLK_CD2X_DIV_SEL_4;
>  	}
>  }
> @@ -2825,7 +2834,13 @@ u32 intel_read_rawclk(struct drm_i915_private
> *dev_priv)
>   */
>  void intel_init_cdclk_hooks(struct drm_i915_private *dev_priv)  {
> -	if (IS_ROCKETLAKE(dev_priv)) {
> +	if (IS_ALDERLAKE_P(dev_priv)) {
> +		dev_priv->display.set_cdclk = bxt_set_cdclk;
> +		dev_priv->display.bw_calc_min_cdclk =
> skl_bw_calc_min_cdclk;
> +		dev_priv->display.modeset_calc_cdclk =
> bxt_modeset_calc_cdclk;
> +		dev_priv->display.calc_voltage_level = tgl_calc_voltage_level;
> +		dev_priv->cdclk.table = adlp_cdclk_table;
> +	} else if (IS_ROCKETLAKE(dev_priv)) {
>  		dev_priv->display.set_cdclk = bxt_set_cdclk;
>  		dev_priv->display.bw_calc_min_cdclk =
> skl_bw_calc_min_cdclk;
>  		dev_priv->display.modeset_calc_cdclk =
> bxt_modeset_calc_cdclk;
> --
> 2.25.4
> 
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