drm/i915/pps: Split pps_init_delays() into distinct parts

[ Upstream commit 75bd0d5 ]

Split each of the hw/vbt/spec PPS delay initialization into
separate functions to make the whole thing less cluttered.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220510104242.6099-4-ville.syrjala@linux.intel.com
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Stable-dep-of: 607f417 ("drm/i915/dsi: filter invalid backlight and CABC ports")
Signed-off-by: Sasha Levin <sashal@kernel.org>

drivers/gpu/drm/i915/display/intel_pps.c

@@ -1159,53 +1159,83 @@ intel_pps_verify_state(struct intel_dp *intel_dp)
 	}
 }
 
-static void pps_init_delays(struct intel_dp *intel_dp)
+static void pps_init_delays_cur(struct intel_dp *intel_dp,
+				struct edp_power_seq *cur)
 {
 	struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
-	struct edp_power_seq cur, vbt, spec,
-		*final = &intel_dp->pps.pps_delays;
 
 	lockdep_assert_held(&dev_priv->pps_mutex);
 
-	/* already initialized? */
-	if (final->t11_t12 != 0)
-		return;
+	intel_pps_readout_hw_state(intel_dp, cur);
+
+	intel_pps_dump_state(intel_dp, "cur", cur);
+}
 
-	intel_pps_readout_hw_state(intel_dp, &cur);
+static void pps_init_delays_vbt(struct intel_dp *intel_dp,
+				struct edp_power_seq *vbt)
+{
+	struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
 
-	intel_pps_dump_state(intel_dp, "cur", &cur);
+	*vbt = dev_priv->vbt.edp.pps;
 
-	vbt = dev_priv->vbt.edp.pps;
 	/* On Toshiba Satellite P50-C-18C system the VBT T12 delay
 	 * of 500ms appears to be too short. Ocassionally the panel
 	 * just fails to power back on. Increasing the delay to 800ms
 	 * seems sufficient to avoid this problem.
 	 */
 	if (dev_priv->quirks & QUIRK_INCREASE_T12_DELAY) {
-		vbt.t11_t12 = max_t(u16, vbt.t11_t12, 1300 * 10);
+		vbt->t11_t12 = max_t(u16, vbt->t11_t12, 1300 * 10);
 		drm_dbg_kms(&dev_priv->drm,
 			    "Increasing T12 panel delay as per the quirk to %d\n",
-			    vbt.t11_t12);
+			    vbt->t11_t12);
 	}
+
 	/* T11_T12 delay is special and actually in units of 100ms, but zero
 	 * based in the hw (so we need to add 100 ms). But the sw vbt
 	 * table multiplies it with 1000 to make it in units of 100usec,
 	 * too. */
-	vbt.t11_t12 += 100 * 10;
+	vbt->t11_t12 += 100 * 10;
+
+	intel_pps_dump_state(intel_dp, "vbt", vbt);
+}
+
+static void pps_init_delays_spec(struct intel_dp *intel_dp,
+				 struct edp_power_seq *spec)
+{
+	struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
+
+	lockdep_assert_held(&dev_priv->pps_mutex);
 
 	/* Upper limits from eDP 1.3 spec. Note that we use the clunky units of
 	 * our hw here, which are all in 100usec. */
-	spec.t1_t3 = 210 * 10;
-	spec.t8 = 50 * 10; /* no limit for t8, use t7 instead */
-	spec.t9 = 50 * 10; /* no limit for t9, make it symmetric with t8 */
-	spec.t10 = 500 * 10;
+	spec->t1_t3 = 210 * 10;
+	spec->t8 = 50 * 10; /* no limit for t8, use t7 instead */
+	spec->t9 = 50 * 10; /* no limit for t9, make it symmetric with t8 */
+	spec->t10 = 500 * 10;
 	/* This one is special and actually in units of 100ms, but zero
 	 * based in the hw (so we need to add 100 ms). But the sw vbt
 	 * table multiplies it with 1000 to make it in units of 100usec,
 	 * too. */
-	spec.t11_t12 = (510 + 100) * 10;
+	spec->t11_t12 = (510 + 100) * 10;
+
+	intel_pps_dump_state(intel_dp, "spec", spec);
+}
+
+static void pps_init_delays(struct intel_dp *intel_dp)
+{
+	struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
+	struct edp_power_seq cur, vbt, spec,
+		*final = &intel_dp->pps.pps_delays;
+
+	lockdep_assert_held(&dev_priv->pps_mutex);
+
+	/* already initialized? */
+	if (final->t11_t12 != 0)
+		return;
 
-	intel_pps_dump_state(intel_dp, "vbt", &vbt);
+	pps_init_delays_cur(intel_dp, &cur);
+	pps_init_delays_vbt(intel_dp, &vbt);
+	pps_init_delays_spec(intel_dp, &spec);
 
 	/* Use the max of the register settings and vbt. If both are
 	 * unset, fall back to the spec limits. */