drm/i915/psr: Add helpers for block count number handling

Add helpers to make it more clear how PSR2_CTL[Block Count Number]
is configured.

Signed-off-by: Jouni Högander <jouni.hogander@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230329150703.432072-5-jouni.hogander@intel.com

diff --git a/drivers/gpu/drm/i915/display/intel_psr.c b/drivers/gpu/drm/i915/display/intel_psr.c
index 98f48eb..07b0c01 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_psr.c
+++ b/drivers/gpu/drm/i915/display/intel_psr.c
@@ -519,6 +519,17 @@ static u32 intel_psr2_get_tp_time(struct intel_dp *intel_dp)
        return val;
 }
 
+static int psr2_block_count_lines(struct intel_dp *intel_dp)
+{
+       return intel_dp->psr.io_wake_lines < 9 &&
+               intel_dp->psr.fast_wake_lines < 9 ? 8 : 12;
+}
+
+static int psr2_block_count(struct intel_dp *intel_dp)
+{
+       return psr2_block_count_lines(intel_dp) / 4;
+}
+
 static void hsw_activate_psr2(struct intel_dp *intel_dp)
 {
        struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
@@ -536,11 +547,10 @@ static void hsw_activate_psr2(struct intel_dp *intel_dp)
        val |= intel_psr2_get_tp_time(intel_dp);
 
        if (DISPLAY_VER(dev_priv) >= 12) {
-               if (intel_dp->psr.io_wake_lines < 9 &&
-                   intel_dp->psr.fast_wake_lines < 9)
-                       val |= TGL_EDP_PSR2_BLOCK_COUNT_NUM_2;
-               else
+               if (psr2_block_count(intel_dp) > 2)
                        val |= TGL_EDP_PSR2_BLOCK_COUNT_NUM_3;
+               else
+                       val |= TGL_EDP_PSR2_BLOCK_COUNT_NUM_2;
        }
 
        /* Wa_22012278275:adl-p */