[PATCH v5 4/5] drm/i915/psr: Add IO buffer wake times for LunarLake and beyond

[Jouni Högander]

IO buffer wake time used for IO wake calculation is dependent on port clock
on LunarLake and beyond. Take this into account in get_io_buffer_wake_time.

Bspec: 65450

v2: add own io_wake_time helper for LunarLake

Signed-off-by: Jouni Högander <jouni.hogander at intel.com>
---
 drivers/gpu/drm/i915/display/intel_psr.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/display/intel_psr.c b/drivers/gpu/drm/i915/display/intel_psr.c
index 747761efa4be..e3daaf05d640 100644
--- a/drivers/gpu/drm/i915/display/intel_psr.c
+++ b/drivers/gpu/drm/i915/display/intel_psr.c
@@ -1165,11 +1165,23 @@ static int tgl_io_buffer_wake_time(void)
 	return 10;
 }
 
+static int lnl_io_buffer_wake_time(int port_clock)
+{
+	if (port_clock > 270000)
+		return 10;
+	else if (port_clock > 162000)
+		return 11;
+	else
+		return 15;
+}
+
 static int io_buffer_wake_time(const struct intel_crtc_state *crtc_state)
 {
 	struct drm_i915_private *i915 = to_i915(crtc_state->uapi.crtc->dev);
 
-	if (DISPLAY_VER(i915) >= 12)
+	if (DISPLAY_VER(i915) >= 20)
+		return lnl_io_buffer_wake_time(crtc_state->port_clock);
+	else if (DISPLAY_VER(i915) >= 12)
 		return tgl_io_buffer_wake_time();
 	else
 		return skl_io_buffer_wake_time();
-- 
2.34.1