[Intel-gfx] [PATCH v3 24/29] drm/i915/lnl: Add CDCLK table

[Matt Roper]

On Mon, Sep 11, 2023 at 09:48:32PM -0700, Lucas De Marchi wrote:
> From: Stanislav Lisovskiy <stanislav.lisovskiy at intel.com>
> 
> Add a new CDCLK table for Lunar Lake.
> 
> v2:
>   - Remove mdclk from the table as it's not needed (Matt Roper)
>   - Update waveform values to the latest from spec (Matt Roper)
>   - Rename functions and calculation to match by pixel rate (Lucas)
> v3: Keep only the table: as far as intel_pixel_rate_to_cdclk()
>     is concerned, the minimum cdclk should still be half the pixel
>     rate on Xe2 (bspec 68858:
>     "Pipe maximum pixel rate = 2 * CDCLK frequency * Pipe Ratio")
>     (Matt Roper)
> 
> Bspec: 68861, 68858
> Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy at intel.com>
> Signed-off-by: Lucas De Marchi <lucas.demarchi at intel.com>

Reviewed-by: Matt Roper <matthew.d.roper at intel.com>

> ---
>  drivers/gpu/drm/i915/display/intel_cdclk.c | 30 +++++++++++++++++++++-
>  1 file changed, 29 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_cdclk.c b/drivers/gpu/drm/i915/display/intel_cdclk.c
> index 656ff50def39..4cde78db83a1 100644
> --- a/drivers/gpu/drm/i915/display/intel_cdclk.c
> +++ b/drivers/gpu/drm/i915/display/intel_cdclk.c
> @@ -1382,6 +1382,31 @@ static const struct intel_cdclk_vals mtl_cdclk_table[] = {
>  	{}
>  };
>  
> +static const struct intel_cdclk_vals lnl_cdclk_table[] = {
> +	{ .refclk = 38400, .cdclk = 153600, .divider = 2, .ratio = 16, .waveform = 0xaaaa },
> +	{ .refclk = 38400, .cdclk = 172800, .divider = 2, .ratio = 16, .waveform = 0xad5a },
> +	{ .refclk = 38400, .cdclk = 192000, .divider = 2, .ratio = 16, .waveform = 0xb6b6 },
> +	{ .refclk = 38400, .cdclk = 211200, .divider = 2, .ratio = 16, .waveform = 0xdbb6 },
> +	{ .refclk = 38400, .cdclk = 230400, .divider = 2, .ratio = 16, .waveform = 0xeeee },
> +	{ .refclk = 38400, .cdclk = 249600, .divider = 2, .ratio = 16, .waveform = 0xf7de },
> +	{ .refclk = 38400, .cdclk = 268800, .divider = 2, .ratio = 16, .waveform = 0xfefe },
> +	{ .refclk = 38400, .cdclk = 288000, .divider = 2, .ratio = 16, .waveform = 0xfffe },
> +	{ .refclk = 38400, .cdclk = 307200, .divider = 2, .ratio = 16, .waveform = 0xffff },
> +	{ .refclk = 38400, .cdclk = 330000, .divider = 2, .ratio = 25, .waveform = 0xdbb6 },
> +	{ .refclk = 38400, .cdclk = 360000, .divider = 2, .ratio = 25, .waveform = 0xeeee },
> +	{ .refclk = 38400, .cdclk = 390000, .divider = 2, .ratio = 25, .waveform = 0xf7de },
> +	{ .refclk = 38400, .cdclk = 420000, .divider = 2, .ratio = 25, .waveform = 0xfefe },
> +	{ .refclk = 38400, .cdclk = 450000, .divider = 2, .ratio = 25, .waveform = 0xfffe },
> +	{ .refclk = 38400, .cdclk = 480000, .divider = 2, .ratio = 25, .waveform = 0xffff },
> +	{ .refclk = 38400, .cdclk = 487200, .divider = 2, .ratio = 29, .waveform = 0xfefe },
> +	{ .refclk = 38400, .cdclk = 522000, .divider = 2, .ratio = 29, .waveform = 0xfffe },
> +	{ .refclk = 38400, .cdclk = 556800, .divider = 2, .ratio = 29, .waveform = 0xffff },
> +	{ .refclk = 38400, .cdclk = 571200, .divider = 2, .ratio = 34, .waveform = 0xfefe },
> +	{ .refclk = 38400, .cdclk = 612000, .divider = 2, .ratio = 34, .waveform = 0xfffe },
> +	{ .refclk = 38400, .cdclk = 652800, .divider = 2, .ratio = 34, .waveform = 0xffff },
> +	{}
> +};
> +
>  static int bxt_calc_cdclk(struct drm_i915_private *dev_priv, int min_cdclk)
>  {
>  	const struct intel_cdclk_vals *table = dev_priv->display.cdclk.table;
> @@ -3591,7 +3616,10 @@ static const struct intel_cdclk_funcs i830_cdclk_funcs = {
>   */
>  void intel_init_cdclk_hooks(struct drm_i915_private *dev_priv)
>  {
> -	if (DISPLAY_VER(dev_priv) >= 14) {
> +	if (DISPLAY_VER(dev_priv) >= 20) {
> +		dev_priv->display.funcs.cdclk = &mtl_cdclk_funcs;
> +		dev_priv->display.cdclk.table = lnl_cdclk_table;
> +	} else if (DISPLAY_VER(dev_priv) >= 14) {
>  		dev_priv->display.funcs.cdclk = &mtl_cdclk_funcs;
>  		dev_priv->display.cdclk.table = mtl_cdclk_table;
>  	} else if (IS_DG2(dev_priv)) {
> -- 
> 2.40.1
> 

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