[PATCH v2] drm/i915/display: Adjust Added Wake Time with PKG_C_LATENCY

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

The PKG_C_LATENCY Added Wake Time field is not working.
When added wake time is needed, such as for flip queue
DSB execution, increase the PKG_C_LATENCY Pkg C Latency
field by the added wake time.

WA: 22020432604

v1: Initial version.
v2: Rebase and cosmetic changes.

Cc: Suraj Kandpal <suraj.kandpal@intel.com>
Signed-off-by: Animesh Manna <animesh.manna@intel.com>
---
 drivers/gpu/drm/i915/display/skl_watermark.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/skl_watermark.c b/drivers/gpu/drm/i915/display/skl_watermark.c
index d93f6786db0e..f6f7205e06eb 100644
--- a/drivers/gpu/drm/i915/display/skl_watermark.c
+++ b/drivers/gpu/drm/i915/display/skl_watermark.c
@@ -2894,6 +2894,12 @@ intel_program_dpkgc_latency(struct intel_atomic_state *state)
 			display->sagv.block_time_us;
 	}
 
+	/* Wa_22020432604 */
+	if (DISPLAY_VER(i915) == 30) {
+		latency += added_wake_time;
+		added_wake_time = 0;
+	}
+
 	clear = LNL_ADDED_WAKE_TIME_MASK | LNL_PKG_C_LATENCY_MASK;
 	val = REG_FIELD_PREP(LNL_PKG_C_LATENCY_MASK, latency) |
 		REG_FIELD_PREP(LNL_ADDED_WAKE_TIME_MASK, added_wake_time);
-- 
2.29.0