[PATCH v4 08/13] drm/i915/cmtg: Split CMTG support check from intel_cmtg_is_allowed()

[Animesh Manna <animesh.manna@intel.com>]

Introduce a dedicated hook to check whether CMTG is supported. This
helper is used in both the enable and disable sequences, while
intel_cmtg_is_allowed() is now used only in enable path.

Signed-off-by: Animesh Manna <animesh.manna@intel.com>
---
 drivers/gpu/drm/i915/display/intel_cmtg.c | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_cmtg.c b/drivers/gpu/drm/i915/display/intel_cmtg.c
index f9cfb639b9fd..c043fb4f9789 100644
--- a/drivers/gpu/drm/i915/display/intel_cmtg.c
+++ b/drivers/gpu/drm/i915/display/intel_cmtg.c
@@ -82,6 +82,18 @@ static void intel_cmtg_dump_config(struct intel_display *display,
 		    str_yes_no(cmtg_config->trans_b_secondary));
 }
 
+static bool intel_cmtg_is_supported(const struct intel_crtc_state *crtc_state)
+{
+	struct intel_display *display = to_intel_display(crtc_state);
+	enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
+
+	if ((cpu_transcoder == TRANSCODER_A || cpu_transcoder == TRANSCODER_B) &&
+	    DISPLAY_VER(display) == 35 && intel_crtc_has_type(crtc_state, INTEL_OUTPUT_EDP))
+		return true;
+
+	return false;
+}
+
 static bool intel_cmtg_transcoder_is_secondary(struct intel_display *display,
 					       enum transcoder trans)
 {
@@ -190,11 +202,9 @@ void intel_cmtg_sanitize(struct intel_display *display)
 bool intel_cmtg_is_allowed(const struct intel_crtc_state *crtc_state)
 {
 	struct intel_display *display = to_intel_display(crtc_state);
-	enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
 	struct i915_power_domains *power_domains = &display->power.domains;
 
-	if ((cpu_transcoder == TRANSCODER_A || cpu_transcoder == TRANSCODER_B) &&
-	    DISPLAY_VER(display) == 35 && intel_crtc_has_type(crtc_state, INTEL_OUTPUT_EDP) &&
+	if (intel_cmtg_is_supported(crtc_state) &&
 	    power_domains->target_dc_state == DC_STATE_EN_DC3CO)
 		return true;
 
-- 
2.29.0