[PATCH v2 1/3] drm/i915/icl: use ranges for voltage level lookup

[Lucas De Marchi <lucas.demarchi@intel.com>]

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>
---
 drivers/gpu/drm/i915/intel_cdclk.c | 19 +++++--------------
 1 file changed, 5 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_cdclk.c b/drivers/gpu/drm/i915/intel_cdclk.c
index 6988c6cbc362..465a72d185ad 100644
--- a/drivers/gpu/drm/i915/intel_cdclk.c
+++ b/drivers/gpu/drm/i915/intel_cdclk.c
@@ -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,
-- 
2.21.0

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