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

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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
This commit is contained in:
Lucas De Marchi 2019-06-10 14:48:19 -07:00
parent 09a32cb7b4
commit 4f338ac0b2
1 changed files with 5 additions and 14 deletions
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19
drivers/gpu/drm/i915/intel_cdclk.c
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@ -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,