Commit 4f338ac0 authored Jun 10, 2019 by Lucas De Marchi

drm/i915/icl: use ranges for voltage level lookup

Spec shows voltage level 0 as 307.2, 312, or lower and suggests to use
range checks. Prepare for having other frequencies in these ranges by
not comparing the exact frequency.

v2: invert checks by comparing biggest cdclk first (suggested by Ville)

Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190610214819.9703-1-lucas.demarchi@intel.com

parent 09a32cb7

drivers/gpu/drm/i915/intel_cdclk.c

+5 −14

Original line number	Diff line number	Diff line
		@@ -1865,21 +1865,12 @@ static void icl_set_cdclk(struct drm_i915_private *dev_priv,

		static u8 icl_calc_voltage_level(int cdclk)
		{
		switch (cdclk) {
		case 50000:
		case 307200:
		case 312000:
		return 0;
		case 556800:
		case 552000:
		return 1;
		default:
		MISSING_CASE(cdclk);
		/* fall through */
		case 652800:
		case 648000:
		if (cdclk > 556800)
		return 2;
		}
		else if (cdclk > 312000)
		return 1;
		else
		return 0;
		}

		static void icl_get_cdclk(struct drm_i915_private *dev_priv,