drm/i915/display: Allow users to disable PSR2

Some users are suffering with PSR2 issues that are under debug or
issues that were root caused to panel firmware bugs, to make life of
those users easier here adding a option to disable PSR2 with kernel
parameters so they can still benefit from PSR1 power savings.

Using the same enable_psr that is current used to turn the whole
feature on or off and allowing user to select up to what PSR version
it should enable.
Right now users only set this parameter to 0 when they want to disable
PSR1 and PSR2 or don't add it at all leaving it to per-chip behavior
so it should not cause a bad impact on users.

v2:
- changing enable_psr values (Ville and Rodrigo)

Link: https://gitlab.freedesktop.org/drm/intel/-/issues/4951
Cc: Jouni Högander <jouni.hogander@intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Reviewed-by: Jouni Högander <jouni.hogander@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220224202523.993560-1-jose.souza@intel.com

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

@@ -100,11 +100,15 @@ static bool psr_global_enabled(struct intel_dp *intel_dp)
 
 static bool psr2_global_enabled(struct intel_dp *intel_dp)
 {
+	struct drm_i915_private *i915 = dp_to_i915(intel_dp);
+
 	switch (intel_dp->psr.debug & I915_PSR_DEBUG_MODE_MASK) {
 	case I915_PSR_DEBUG_DISABLE:
 	case I915_PSR_DEBUG_FORCE_PSR1:
 		return false;
 	default:
+		if (i915->params.enable_psr == 1)
+			return false;
 		return true;
 	}
 }

drivers/gpu/drm/i915/i915_params.c

@@ -96,7 +96,7 @@ i915_param_named_unsafe(enable_hangcheck, bool, 0400,
 
 i915_param_named_unsafe(enable_psr, int, 0400,
 	"Enable PSR "
-	"(0=disabled, 1=enabled) "
+	"(0=disabled, 1=enable up to PSR1, 2=enable up to PSR2) "
 	"Default: -1 (use per-chip default)");
 
 i915_param_named(psr_safest_params, bool, 0400,