[PATCH v4 09/15] media: intel: ipu-bridge: allow sensor-specific link frequencies

[Maurizio Casciano]

A bridge-specific firmware parser may have more accurate link-frequency
information than the generic ACPI hardware-ID table. Let it store link
frequencies in the per-sensor bridge data and prefer those values when
constructing the endpoint software node.

Existing bridges continue to use the hardware-ID table when no
sensor-specific frequencies are supplied.

Link: https://lore.kernel.org/linux-media/apFzAc5XfV9gQpXS@kekkonen.localdomain/
Signed-off-by: Maurizio Casciano <mauriziocasciano7@xxxxxxxxx>
Assisted-by: Codex:gpt-5.6-sol sparse
---
 drivers/media/pci/intel/ipu-bridge.c | 15 ++++++++++-----
 include/media/ipu-bridge.h           |  2 ++
 2 files changed, 12 insertions(+), 5 deletions(-)

diff --git a/drivers/media/pci/intel/ipu-bridge.c b/drivers/media/pci/intel/ipu-bridge.c
index 47317c423fad..5730a95767a2 100644
--- a/drivers/media/pci/intel/ipu-bridge.c
+++ b/drivers/media/pci/intel/ipu-bridge.c
@@ -520,11 +520,16 @@ static void ipu_bridge_create_fwnode_properties(
 					sensor->prop_names.remote_endpoint,
 					sensor->local_ref);
 
-	if (cfg->nr_link_freqs > 0)
-		sensor->ep_properties[3] = PROPERTY_ENTRY_U64_ARRAY_LEN(
-			sensor->prop_names.link_frequencies,
-			cfg->link_freqs,
-			cfg->nr_link_freqs);
+	if (sensor->nr_link_freqs > 0)
+		sensor->ep_properties[3] =
+			PROPERTY_ENTRY_U64_ARRAY_LEN(names->link_frequencies,
+						     sensor->link_freqs,
+						     sensor->nr_link_freqs);
+	else if (cfg->nr_link_freqs > 0)
+		sensor->ep_properties[3] =
+			PROPERTY_ENTRY_U64_ARRAY_LEN(names->link_frequencies,
+						     cfg->link_freqs,
+						     cfg->nr_link_freqs);
 
 	sensor->ipu_properties[0] = PROPERTY_ENTRY_U32_ARRAY_LEN(
 					sensor->prop_names.data_lanes,
diff --git a/include/media/ipu-bridge.h b/include/media/ipu-bridge.h
index 16fac765456e..2290a92361fe 100644
--- a/include/media/ipu-bridge.h
+++ b/include/media/ipu-bridge.h
@@ -135,10 +135,12 @@ struct ipu_sensor {
 
 	u8 link;
 	u8 lanes;
+	u8 nr_link_freqs;
 	u32 mclkspeed;
 	u32 rotation;
 	enum v4l2_fwnode_orientation orientation;
 	const char *vcm_type;
+	u64 link_freqs[MAX_NUM_LINK_FREQS];
 
 	struct ipu_property_names prop_names;
 	struct property_entry ep_properties[5];
-- 
2.53.0