[PATCH] drm/i915/display: correct dual pps handling for MTL_PCH+

[Dnyaneshwar Bhadane]

On the PCH side the second PPS was introduced in ICP+.Add condition
On MTL_PCH and greater platform also having the second PPS.

Note that DG1/2 south block only has the single PPS, so need
to exclude the fake DG1/2 PCHs

Link: https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/11488
Signed-off-by: Dnyaneshwar Bhadane <dnyaneshwar.bhadane at intel.com>
---
 drivers/gpu/drm/i915/display/intel_backlight.c | 3 +++
 drivers/gpu/drm/i915/display/intel_pps.c       | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_backlight.c b/drivers/gpu/drm/i915/display/intel_backlight.c
index 071668bfe5d1..6c3333136737 100644
--- a/drivers/gpu/drm/i915/display/intel_backlight.c
+++ b/drivers/gpu/drm/i915/display/intel_backlight.c
@@ -1449,6 +1449,9 @@ bxt_setup_backlight(struct intel_connector *connector, enum pipe unused)
 
 static int cnp_num_backlight_controllers(struct drm_i915_private *i915)
 {
+	if (INTEL_PCH_TYPE(i915) >= PCH_MTL)
+		return 2;
+
 	if (INTEL_PCH_TYPE(i915) >= PCH_DG1)
 		return 1;
 
diff --git a/drivers/gpu/drm/i915/display/intel_pps.c b/drivers/gpu/drm/i915/display/intel_pps.c
index 42306bc4ba86..7ce926241e83 100644
--- a/drivers/gpu/drm/i915/display/intel_pps.c
+++ b/drivers/gpu/drm/i915/display/intel_pps.c
@@ -351,6 +351,9 @@ static int intel_num_pps(struct drm_i915_private *i915)
 	if (IS_GEMINILAKE(i915) || IS_BROXTON(i915))
 		return 2;
 
+	if (INTEL_PCH_TYPE(i915) >= PCH_MTL)
+		return 2;
+
 	if (INTEL_PCH_TYPE(i915) >= PCH_DG1)
 		return 1;
 
-- 
2.34.1