[PATCH v6 11/26] drm/i915/psr: Move vblank length check to separate function

["Jouni Högander" <jouni.hogander@intel.com>]

We are about to add more complexity to vblank length check. It makes sense
to move it to separate function for sake of clarity.

Signed-off-by: Jouni Högander <jouni.hogander@intel.com>
---
 drivers/gpu/drm/i915/display/intel_psr.c | 18 +++++++++++++++---
 1 file changed, 15 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_psr.c b/drivers/gpu/drm/i915/display/intel_psr.c
index 3530e5f44096..23c3fed1f983 100644
--- a/drivers/gpu/drm/i915/display/intel_psr.c
+++ b/drivers/gpu/drm/i915/display/intel_psr.c
@@ -1243,6 +1243,20 @@ static int intel_psr_entry_setup_frames(struct intel_dp *intel_dp,
 	return entry_setup_frames;
 }
 
+static bool vblank_length_valid(struct intel_dp *intel_dp,
+				const struct intel_crtc_state *crtc_state)
+{
+	int vblank = crtc_state->hw.adjusted_mode.crtc_vblank_end -
+		crtc_state->hw.adjusted_mode.crtc_vblank_start;
+	int wake_lines = psr2_block_count_lines(intel_dp);
+
+	/* Vblank >= PSR2_CTL Block Count Number maximum line count */
+	if (vblank < wake_lines)
+		return false;
+
+	return true;
+}
+
 static bool intel_psr2_config_valid(struct intel_dp *intel_dp,
 				    struct intel_crtc_state *crtc_state)
 {
@@ -1333,9 +1347,7 @@ static bool intel_psr2_config_valid(struct intel_dp *intel_dp,
 	}
 
 	/* Vblank >= PSR2_CTL Block Count Number maximum line count */
-	if (crtc_state->hw.adjusted_mode.crtc_vblank_end -
-	    crtc_state->hw.adjusted_mode.crtc_vblank_start <
-	    psr2_block_count_lines(intel_dp)) {
+	if (!vblank_length_valid(intel_dp, crtc_state)) {
 		drm_dbg_kms(&dev_priv->drm,
 			    "PSR2 not enabled, too short vblank time\n");
 		return false;
-- 
2.34.1