[Intel-gfx] [PATCH] drm/i915/icl: use ranges for voltage level lookup

[Lucas De Marchi]

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.

Signed-off-by: Lucas De Marchi <lucas.demarchi at intel.com>
---
 drivers/gpu/drm/i915/intel_cdclk.c | 21 +++++++++------------
 1 file changed, 9 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_cdclk.c b/drivers/gpu/drm/i915/intel_cdclk.c
index 6988c6cbc362..b175a2926caf 100644
--- a/drivers/gpu/drm/i915/intel_cdclk.c
+++ b/drivers/gpu/drm/i915/intel_cdclk.c
@@ -1865,21 +1865,18 @@ 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:
+	if (cdclk <= 312000)
 		return 0;
-	case 556800:
-	case 552000:
+
+	if (cdclk <= 556800)
 		return 1;
-	default:
-		MISSING_CASE(cdclk);
-		/* fall through */
-	case 652800:
-	case 648000:
+
+	if (cdclk <= 652800)
 		return 2;
-	}
+
+	MISSING_CASE(cdclk);
+
+	return 2;
 }
 
 static void icl_get_cdclk(struct drm_i915_private *dev_priv,
-- 
2.21.0