drm/i915: Enable fastboot across the board

There's nothing magical about vlv+ platforms vs. fastboot.
If it works somewhere it should work everywhere, assuming
we've not missed any crucial state checks. That seems unlikely
on older platforms with less state to check anyway.

Just enable fastboot across the board, and the remove the
remnants of the optional stuff (we already removed the
modparam for fastboot anyway).
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240209183809.16887-6-ville.syrjala@linux.intel.comReviewed-by: Mika Kahola <mika.kahola@intel.com>

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

@@ -4938,20 +4938,6 @@ pipe_config_pll_mismatch(bool fastset,
 	}
 }
 
-static bool fastboot_enabled(struct drm_i915_private *dev_priv)
-{
-	/* Enable fastboot by default on Skylake and newer */
-	if (DISPLAY_VER(dev_priv) >= 9)
-		return true;
-
-	/* Enable fastboot by default on VLV and CHV */
-	if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
-		return true;
-
-	/* Disabled by default on all others */
-	return false;
-}
-
 bool
 intel_pipe_config_compare(const struct intel_crtc_state *current_config,
 			  const struct intel_crtc_state *pipe_config,
@@ -4960,14 +4946,6 @@ intel_pipe_config_compare(const struct intel_crtc_state *current_config,
 	struct drm_i915_private *dev_priv = to_i915(current_config->uapi.crtc->dev);
 	struct intel_crtc *crtc = to_intel_crtc(pipe_config->uapi.crtc);
 	bool ret = true;
-	bool fixup_inherited = fastset &&
-		current_config->inherited && !pipe_config->inherited;
-
-	if (fixup_inherited && !fastboot_enabled(dev_priv)) {
-		drm_dbg_kms(&dev_priv->drm,
-			    "initial modeset and fastboot not set\n");
-		ret = false;
-	}
 
 #define PIPE_CONF_CHECK_X(name) do { \
 	if (current_config->name != pipe_config->name) { \