[PATCH 07/20] drm/amd/display: block passive dongle EDID Emulation for USB-C ports

[Bhawanpreet Lakha]

From: Samson Tam <Samson.Tam at amd.com>

[Why]
Emulating passive dongle on USB-C port causes issue on some asics.

[How]
Check for DP_IS_USB_C flag in bios parser and propagate it to
encoder features flags. If DP_IS_USB_C flag is set and it is trying to
emulate passive dongle, then return fail.

Change-Id: I32fde1170622fb3acd8b1fe8b86b3755e98b0c68
Signed-off-by: Samson Tam <Samson.Tam at amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng at amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet Lakha at amd.com>
---
 drivers/gpu/drm/amd/display/dc/bios/bios_parser2.c        | 2 ++
 drivers/gpu/drm/amd/display/dc/dcn10/dcn10_link_encoder.c | 2 ++
 drivers/gpu/drm/amd/display/dc/inc/hw/link_encoder.h      | 1 +
 drivers/gpu/drm/amd/display/include/bios_parser_types.h   | 3 ++-
 4 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/bios/bios_parser2.c b/drivers/gpu/drm/amd/display/dc/bios/bios_parser2.c
index fd5266a58297..12bc7ee66b18 100644
--- a/drivers/gpu/drm/amd/display/dc/bios/bios_parser2.c
+++ b/drivers/gpu/drm/amd/display/dc/bios/bios_parser2.c
@@ -1313,6 +1313,8 @@ static enum bp_result bios_parser_get_encoder_cap_info(
 			ATOM_ENCODER_CAP_RECORD_HBR3_EN) ? 1 : 0;
 	info->HDMI_6GB_EN = (record->encodercaps &
 			ATOM_ENCODER_CAP_RECORD_HDMI6Gbps_EN) ? 1 : 0;
+	info->DP_IS_USB_C = (record->encodercaps &
+			ATOM_ENCODER_CAP_RECORD_USB_C_TYPE) ? 1 : 0;
 
 	return BP_RESULT_OK;
 }
diff --git a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_link_encoder.c b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_link_encoder.c
index 0126a44ba012..e25ae43f8d32 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_link_encoder.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_link_encoder.c
@@ -726,6 +726,8 @@ void dcn10_link_encoder_construct(
 		enc10->base.features.flags.bits.IS_HBR3_CAPABLE =
 				bp_cap_info.DP_HBR3_EN;
 		enc10->base.features.flags.bits.HDMI_6GB_EN = bp_cap_info.HDMI_6GB_EN;
+		enc10->base.features.flags.bits.DP_IS_USB_C =
+				bp_cap_info.DP_IS_USB_C;
 	} else {
 		DC_LOG_WARNING("%s: Failed to get encoder_cap_info from VBIOS with error code %d!\n",
 				__func__,
diff --git a/drivers/gpu/drm/amd/display/dc/inc/hw/link_encoder.h b/drivers/gpu/drm/amd/display/dc/inc/hw/link_encoder.h
index c9d3e37e9531..ca162079a41b 100644
--- a/drivers/gpu/drm/amd/display/dc/inc/hw/link_encoder.h
+++ b/drivers/gpu/drm/amd/display/dc/inc/hw/link_encoder.h
@@ -59,6 +59,7 @@ struct encoder_feature_support {
 			uint32_t IS_TPS3_CAPABLE:1;
 			uint32_t IS_TPS4_CAPABLE:1;
 			uint32_t HDMI_6GB_EN:1;
+			uint32_t DP_IS_USB_C:1;
 		} bits;
 		uint32_t raw;
 	} flags;
diff --git a/drivers/gpu/drm/amd/display/include/bios_parser_types.h b/drivers/gpu/drm/amd/display/include/bios_parser_types.h
index 01bf01a34a08..c30437ae8395 100644
--- a/drivers/gpu/drm/amd/display/include/bios_parser_types.h
+++ b/drivers/gpu/drm/amd/display/include/bios_parser_types.h
@@ -307,7 +307,8 @@ struct bp_encoder_cap_info {
 	uint32_t DP_HBR2_EN:1;
 	uint32_t DP_HBR3_EN:1;
 	uint32_t HDMI_6GB_EN:1;
-	uint32_t RESERVED:30;
+	uint32_t DP_IS_USB_C:1;
+	uint32_t RESERVED:27;
 };
 
 #endif /*__DAL_BIOS_PARSER_TYPES_H__ */
-- 
2.17.1