[Intel-gfx] [PATCH v2 15/19] drm/i915: Introduce skl_watermark_max_latency()

[Ville Syrjala]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

The DSB code will want to know the maximum PkgC latency
it has to contend with. Add a helper to expose that
information.

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/display/skl_watermark.c | 14 ++++++++++++++
 drivers/gpu/drm/i915/display/skl_watermark.h |  2 ++
 2 files changed, 16 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/skl_watermark.c b/drivers/gpu/drm/i915/display/skl_watermark.c
index d1245c847f1c..a31adbca9dbc 100644
--- a/drivers/gpu/drm/i915/display/skl_watermark.c
+++ b/drivers/gpu/drm/i915/display/skl_watermark.c
@@ -3719,3 +3719,17 @@ void skl_watermark_debugfs_register(struct drm_i915_private *i915)
 		debugfs_create_file("i915_sagv_status", 0444, minor->debugfs_root, i915,
 				    &intel_sagv_status_fops);
 }
+
+unsigned int skl_watermark_max_latency(struct drm_i915_private *i915)
+{
+	int level;
+
+	for (level = i915->display.wm.num_levels - 1; level >= 0; level--) {
+		unsigned int latency = skl_wm_latency(i915, level, NULL);
+
+		if (latency)
+			return latency;
+	}
+
+	return 0;
+}
diff --git a/drivers/gpu/drm/i915/display/skl_watermark.h b/drivers/gpu/drm/i915/display/skl_watermark.h
index f91a3d4ddc07..edb61e33df83 100644
--- a/drivers/gpu/drm/i915/display/skl_watermark.h
+++ b/drivers/gpu/drm/i915/display/skl_watermark.h
@@ -46,6 +46,8 @@ void skl_watermark_ipc_update(struct drm_i915_private *i915);
 bool skl_watermark_ipc_enabled(struct drm_i915_private *i915);
 void skl_watermark_debugfs_register(struct drm_i915_private *i915);
 
+unsigned int skl_watermark_max_latency(struct drm_i915_private *i915);
+
 void skl_wm_init(struct drm_i915_private *i915);
 
 struct intel_dbuf_state {
-- 
2.39.3