drm/i915/ehl: Add voltage level requirement table

EHL has it own voltage level requirement depending on cd clock.

BSpec: 21809
Cc: Clint Taylor <Clinton.A.Taylor@intel.com>
Cc: Matt Roper <matthew.d.roper@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190626014053.30541-3-jose.souza@intel.com

diff --git a/drivers/gpu/drm/i915/display/intel_cdclk.c b/drivers/gpu/drm/i915/display/intel_cdclk.c
index 0dda644..0b8b8ae 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_cdclk.c
+++ b/drivers/gpu/drm/i915/display/intel_cdclk.c
@@ -1866,14 +1866,23 @@ static void icl_set_cdclk(struct drm_i915_private *dev_priv,
        dev_priv->cdclk.hw.voltage_level = cdclk_state->voltage_level;
 }
 
-static u8 icl_calc_voltage_level(int cdclk)
+static u8 icl_calc_voltage_level(struct drm_i915_private *dev_priv, int cdclk)
 {
-       if (cdclk > 556800)
-               return 2;
-       else if (cdclk > 312000)
-               return 1;
-       else
-               return 0;
+       if (IS_ELKHARTLAKE(dev_priv)) {
+               if (cdclk > 312000)
+                       return 2;
+               else if (cdclk > 180000)
+                       return 1;
+               else
+                       return 0;
+       } else {
+               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,
@@ -1924,7 +1933,7 @@ out:
         * at least what the CDCLK frequency requires.
         */
        cdclk_state->voltage_level =
-               icl_calc_voltage_level(cdclk_state->cdclk);
+               icl_calc_voltage_level(dev_priv, cdclk_state->cdclk);
 }
 
 static void icl_init_cdclk(struct drm_i915_private *dev_priv)
@@ -1959,7 +1968,8 @@ sanitize:
        sanitized_state.vco = icl_calc_cdclk_pll_vco(dev_priv,
                                                     sanitized_state.cdclk);
        sanitized_state.voltage_level =
-                               icl_calc_voltage_level(sanitized_state.cdclk);
+                               icl_calc_voltage_level(dev_priv,
+                                                      sanitized_state.cdclk);
 
        icl_set_cdclk(dev_priv, &sanitized_state, INVALID_PIPE);
 }
@@ -1970,7 +1980,8 @@ static void icl_uninit_cdclk(struct drm_i915_private *dev_priv)
 
        cdclk_state.cdclk = cdclk_state.bypass;
        cdclk_state.vco = 0;
-       cdclk_state.voltage_level = icl_calc_voltage_level(cdclk_state.cdclk);
+       cdclk_state.voltage_level = icl_calc_voltage_level(dev_priv,
+                                                          cdclk_state.cdclk);
 
        icl_set_cdclk(dev_priv, &cdclk_state, INVALID_PIPE);
 }
@@ -2561,7 +2572,7 @@ static int icl_modeset_calc_cdclk(struct intel_atomic_state *state)
        state->cdclk.logical.vco = vco;
        state->cdclk.logical.cdclk = cdclk;
        state->cdclk.logical.voltage_level =
-               max(icl_calc_voltage_level(cdclk),
+               max(icl_calc_voltage_level(dev_priv, cdclk),
                    cnl_compute_min_voltage_level(state));
 
        if (!state->active_crtcs) {
@@ -2571,7 +2582,7 @@ static int icl_modeset_calc_cdclk(struct intel_atomic_state *state)
                state->cdclk.actual.vco = vco;
                state->cdclk.actual.cdclk = cdclk;
                state->cdclk.actual.voltage_level =
-                       icl_calc_voltage_level(cdclk);
+                       icl_calc_voltage_level(dev_priv, cdclk);
        } else {
                state->cdclk.actual = state->cdclk.logical;
        }