[PATCH v11 1/8] drm/i915/bios: search for VBT #57 by default

Start searching for Vswing / Preemphasis Override Block during VBT
parsing at init_bdb_blocks().

Check for failure since pre-ICL GOPs do not contain the block. Check
also if VBT version is appropriately up-to-date.

v6->v7
- parse VBT#57 before blocks dependent on child device list (Jani)
- remove debug message (Suraj)

v3->v4
- add Bspec (Suraj)

Bspec: 32063
Signed-off-by: Michał Grzelak <[email protected]>
Reviewed-by: Suraj Kandpal <[email protected]>
---
 drivers/gpu/drm/i915/display/intel_bios.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_bios.c b/drivers/gpu/drm/i915/display/intel_bios.c
index 97cbae2e547e2..ece4df4a9d62a 100644
--- a/drivers/gpu/drm/i915/display/intel_bios.c
+++ b/drivers/gpu/drm/i915/display/intel_bios.c
@@ -200,6 +200,8 @@ static const struct {
 	  .min_size = sizeof(struct bdb_mipi_sequence) },
 	{ .section_id = BDB_COMPRESSION_PARAMETERS,
 	  .min_size = sizeof(struct bdb_compression_parameters), },
+	{ .section_id = BDB_VSWING_PREEMPH,
+	  .min_size = sizeof(struct bdb_vswing_preemph), },
 	{ .section_id = BDB_GENERIC_DTD,
 	  .min_size = sizeof(struct bdb_generic_dtd), },
 };
@@ -2203,6 +2205,21 @@ parse_compression_parameters(struct intel_display *display)
 	}
 }
 
+static void
+parse_vswing_preemph_override(struct intel_display *display)
+{
+	const struct bdb_vswing_preemph *block;
+
+	if (display->vbt.version < 218)
+		return;
+
+	block = bdb_find_section(display, BDB_VSWING_PREEMPH);
+
+	/* pre-ICL GOPs don't have VBT #57 */
+	if (!block)
+		return;
+}
+
 static u8 translate_iboost(struct intel_display *display, u8 val)
 {
 	static const u8 mapping[] = { 1, 3, 7 }; /* See VBT spec */
@@ -3291,6 +3308,7 @@ void intel_bios_init(struct intel_display *display)
 	parse_general_features(display);
 	parse_general_definitions(display);
 	parse_driver_features(display);
+	parse_vswing_preemph_override(display);
 
 	/* Depends on child device list */
 	parse_compression_parameters(display);
-- 
2.45.2