lxrmrz732 at rocketmail.com
2025-Nov-16 00:21 UTC
[PATCH v3 0/2][RESEND] drm/nouveau: add and implement missing DCB connector values
From: Alex Ramirez <lxrmrz732 at rocketmail.com>
uconn.c's handling of display connectors was refactored for Linux v6.5,
causing a regression that issues a warning on boot for GeForce 8600m GT
(MacBookPro4,1)
and likely other legacy GPUs.
Several connector types used to be implicitly supported before v6.5 by a branch
in
[drm/nouveau/nouveau_connector.c:1353] that determined connector types using
encoder
bits, but these connectors have since been left entirely unhandled after the
refactor
due to the aforementioned kernel warning causing that branch to never be taken.
nv_connector->type is generally 0x0 (DCB_CONNECTOR_VGA) in the case of an
unknown
connector because the WARN_ON macro in
[drm/nouveau/nvkm/engine/disp/uconn.c:214]
causes nvkm_uconn_new to bail out before a suitable connector value is chosen;
it *seems* like the value is left undefined.
This patch set implements the missing DCB connector values per NVIDIA spec to
fix the
root cause of the warning and changes the WARN_ON macro in uconn.c to a printk
message
to more gracefully indicate unknown connector types, as was done pre-v6.5.
v2: Include better commit messages. My original submission was partially
blocked by a spam filter.
v3: Update NVIDIA documentation link according to Petr Vorel's suggestion.
Alex Ramirez (2):
drm/nouveau: add missing DCB connector types
drm/nouveau: implement missing DCB connector types; gracefully handle
unknown connectors
.../nouveau/include/nvkm/subdev/bios/conn.h | 84 ++++++++++++++-----
.../gpu/drm/nouveau/nvkm/engine/disp/uconn.c | 73 +++++++++++-----
2 files changed, 116 insertions(+), 41 deletions(-)
--
2.51.1
lxrmrz732 at rocketmail.com
2025-Nov-16 00:21 UTC
[PATCH v3 1/2][RESEND] drm/nouveau: add missing DCB connector types
From: Alex Ramirez <lxrmrz732 at rocketmail.com>
* Add missing DCB connectors in conn.h as per the NVIDIA DCB specification.
A lot of connector logic was rewritten for Linux v6.5; some display connector
types
went unaccounted-for which caused kernel warnings on devices with the
now-unsupported
DCB connectors. This patch adds all of the DCB connectors as defined by NVIDIA
to the
dcb_connector_type enum to bring back support for these connectors to the new
logic.
Fixes: 8b7d92cad953 ("drm/nouveau/kms/nv50-: create connectors based on
nvkm info")
Link:
https://download.nvidia.com/open-gpu-doc/DCB/1/DCB-4.0-Specification.html#_connector_table_entry
Signed-off-by: Alex Ramirez <lxrmrz732 at rocketmail.com>
---
.../nouveau/include/nvkm/subdev/bios/conn.h | 84 ++++++++++++++-----
1 file changed, 63 insertions(+), 21 deletions(-)
diff --git a/drivers/gpu/drm/nouveau/include/nvkm/subdev/bios/conn.h
b/drivers/gpu/drm/nouveau/include/nvkm/subdev/bios/conn.h
index d1beaad0c82b..538306522d9a 100644
--- a/drivers/gpu/drm/nouveau/include/nvkm/subdev/bios/conn.h
+++ b/drivers/gpu/drm/nouveau/include/nvkm/subdev/bios/conn.h
@@ -1,28 +1,70 @@
/* SPDX-License-Identifier: MIT */
#ifndef __NVBIOS_CONN_H__
#define __NVBIOS_CONN_H__
+
enum dcb_connector_type {
- DCB_CONNECTOR_VGA = 0x00,
- DCB_CONNECTOR_TV_0 = 0x10,
- DCB_CONNECTOR_TV_1 = 0x11,
- DCB_CONNECTOR_TV_3 = 0x13,
- DCB_CONNECTOR_DVI_I = 0x30,
- DCB_CONNECTOR_DVI_D = 0x31,
- DCB_CONNECTOR_DMS59_0 = 0x38,
- DCB_CONNECTOR_DMS59_1 = 0x39,
- DCB_CONNECTOR_LVDS = 0x40,
- DCB_CONNECTOR_LVDS_SPWG = 0x41,
- DCB_CONNECTOR_DP = 0x46,
- DCB_CONNECTOR_eDP = 0x47,
- DCB_CONNECTOR_mDP = 0x48,
- DCB_CONNECTOR_HDMI_0 = 0x60,
- DCB_CONNECTOR_HDMI_1 = 0x61,
- DCB_CONNECTOR_HDMI_C = 0x63,
- DCB_CONNECTOR_DMS59_DP0 = 0x64,
- DCB_CONNECTOR_DMS59_DP1 = 0x65,
- DCB_CONNECTOR_WFD = 0x70,
- DCB_CONNECTOR_USB_C = 0x71,
- DCB_CONNECTOR_NONE = 0xff
+ /* Analog outputs */
+ DCB_CONNECTOR_VGA = 0x00, // VGA 15-pin connector
+ DCB_CONNECTOR_DVI_A = 0x01, // DVI-A
+ DCB_CONNECTOR_POD_VGA = 0x02, // Pod - VGA 15-pin connector
+ DCB_CONNECTOR_TV_0 = 0x10, // TV - Composite Out
+ DCB_CONNECTOR_TV_1 = 0x11, // TV - S-Video Out
+ DCB_CONNECTOR_TV_2 = 0x12, // TV - S-Video Breakout - Composite
+ DCB_CONNECTOR_TV_3 = 0x13, // HDTV Component - YPrPb
+ DCB_CONNECTOR_TV_SCART = 0x14, // TV - SCART Connector
+ DCB_CONNECTOR_TV_SCART_D = 0x16, // TV - Composite SCART over D-connector
+ DCB_CONNECTOR_TV_DTERM = 0x17, // HDTV - D-connector (EIAJ4120)
+ DCB_CONNECTOR_POD_TV_3 = 0x18, // Pod - HDTV - YPrPb
+ DCB_CONNECTOR_POD_TV_1 = 0x19, // Pod - S-Video
+ DCB_CONNECTOR_POD_TV_0 = 0x1a, // Pod - Composite
+
+ /* DVI digital outputs */
+ DCB_CONNECTOR_DVI_I_TV_1 = 0x20, // DVI-I-TV-S-Video
+ DCB_CONNECTOR_DVI_I_TV_0 = 0x21, // DVI-I-TV-Composite
+ DCB_CONNECTOR_DVI_I_TV_2 = 0x22, // DVI-I-TV-S-Video Breakout-Composite
+ DCB_CONNECTOR_DVI_I = 0x30, // DVI-I
+ DCB_CONNECTOR_DVI_D = 0x31, // DVI-D
+ DCB_CONNECTOR_DVI_ADC = 0x32, // Apple Display Connector (ADC)
+ DCB_CONNECTOR_DMS59_0 = 0x38, // LFH-DVI-I-1
+ DCB_CONNECTOR_DMS59_1 = 0x39, // LFH-DVI-I-2
+ DCB_CONNECTOR_BNC = 0x3c, // BNC Connector [for SDI?]
+
+ /* LVDS / TMDS digital outputs */
+ DCB_CONNECTOR_LVDS = 0x40, // LVDS-SPWG-Attached [is this name correct?]
+ DCB_CONNECTOR_LVDS_SPWG = 0x41, // LVDS-OEM-Attached (non-removable)
+ DCB_CONNECTOR_LVDS_REM = 0x42, // LVDS-SPWG-Detached [following naming above]
+ DCB_CONNECTOR_LVDS_SPWG_REM = 0x43, // LVDS-OEM-Detached (removable)
+ DCB_CONNECTOR_TMDS = 0x45, // TMDS-OEM-Attached (non-removable)
+
+ /* DP digital outputs */
+ DCB_CONNECTOR_DP = 0x46, // DisplayPort External Connector
+ DCB_CONNECTOR_eDP = 0x47, // DisplayPort Internal Connector
+ DCB_CONNECTOR_mDP = 0x48, // DisplayPort (Mini) External Connector
+
+ /* Dock outputs (not used) */
+ DCB_CONNECTOR_DOCK_VGA_0 = 0x50, // VGA 15-pin if not docked
+ DCB_CONNECTOR_DOCK_VGA_1 = 0x51, // VGA 15-pin if docked
+ DCB_CONNECTOR_DOCK_DVI_I_0 = 0x52, // DVI-I if not docked
+ DCB_CONNECTOR_DOCK_DVI_I_1 = 0x53, // DVI-I if docked
+ DCB_CONNECTOR_DOCK_DVI_D_0 = 0x54, // DVI-D if not docked
+ DCB_CONNECTOR_DOCK_DVI_D_1 = 0x55, // DVI-D if docked
+ DCB_CONNECTOR_DOCK_DP_0 = 0x56, // DisplayPort if not docked
+ DCB_CONNECTOR_DOCK_DP_1 = 0x57, // DisplayPort if docked
+ DCB_CONNECTOR_DOCK_mDP_0 = 0x58, // DisplayPort (Mini) if not docked
+ DCB_CONNECTOR_DOCK_mDP_1 = 0x59, // DisplayPort (Mini) if docked
+
+ /* HDMI? digital outputs */
+ DCB_CONNECTOR_HDMI_0 = 0x60, // 3-Pin DIN Stereo Connector [for real?]
+ DCB_CONNECTOR_HDMI_1 = 0x61, // HDMI-A connector
+ DCB_CONNECTOR_SPDIF = 0x62, // Audio S/PDIF connector
+ DCB_CONNECTOR_HDMI_C = 0x63, // HDMI-C (Mini) connector
+
+ /* Misc. digital outputs */
+ DCB_CONNECTOR_DMS59_DP0 = 0x64, // LFH-DP-1
+ DCB_CONNECTOR_DMS59_DP1 = 0x65, // LFH-DP-2
+ DCB_CONNECTOR_WFD = 0x70, // Virtual connector for Wifi Display (WFD)
+ DCB_CONNECTOR_USB_C = 0x71, // [DP over USB-C; not present in docs]
+ DCB_CONNECTOR_NONE = 0xff // Skip Entry
};
struct nvbios_connT {
--
2.51.1
lxrmrz732 at rocketmail.com
2025-Nov-16 00:21 UTC
[PATCH v3 2/2][RESEND] drm/nouveau: implement missing DCB connector types; gracefully handle unknown connectors
From: Alex Ramirez <lxrmrz732 at rocketmail.com>
* Implement missing DCB connectors in uconn.c previously defined in conn.h.
* Replace kernel WARN_ON macro with printk message to more gracefully signify
an unknown connector was encountered.
With this patch, unknown connectors are explicitly marked with value 0
(DCB_CONNECTOR_VGA) to match the tested current behavior. Although 0xff
(DCB_CONNECTOR_NONE) may be more suitable, I don't want to introduce a
breaking change.
Fixes: 8b7d92cad953 ("drm/nouveau/kms/nv50-: create connectors based on
nvkm info")
Link:
https://download.nvidia.com/open-gpu-doc/DCB/1/DCB-4.0-Specification.html#_connector_table_entry
Signed-off-by: Alex Ramirez <lxrmrz732 at rocketmail.com>
---
.../gpu/drm/nouveau/nvkm/engine/disp/uconn.c | 73 ++++++++++++++-----
1 file changed, 53 insertions(+), 20 deletions(-)
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/disp/uconn.c
b/drivers/gpu/drm/nouveau/nvkm/engine/disp/uconn.c
index 2dab6612c4fc..d1fed2beee63 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/disp/uconn.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/disp/uconn.c
@@ -191,27 +191,60 @@ nvkm_uconn_new(const struct nvkm_oclass *oclass, void
*argv, u32 argc, struct nv
spin_lock(&disp->client.lock);
if (!conn->object.func) {
switch (conn->info.type) {
- case DCB_CONNECTOR_VGA : args->v0.type = NVIF_CONN_V0_VGA; break;
- case DCB_CONNECTOR_TV_0 :
- case DCB_CONNECTOR_TV_1 :
- case DCB_CONNECTOR_TV_3 : args->v0.type = NVIF_CONN_V0_TV; break;
- case DCB_CONNECTOR_DMS59_0 :
- case DCB_CONNECTOR_DMS59_1 :
- case DCB_CONNECTOR_DVI_I : args->v0.type = NVIF_CONN_V0_DVI_I; break;
- case DCB_CONNECTOR_DVI_D : args->v0.type = NVIF_CONN_V0_DVI_D; break;
- case DCB_CONNECTOR_LVDS : args->v0.type = NVIF_CONN_V0_LVDS; break;
- case DCB_CONNECTOR_LVDS_SPWG: args->v0.type = NVIF_CONN_V0_LVDS_SPWG;
break;
- case DCB_CONNECTOR_DMS59_DP0:
- case DCB_CONNECTOR_DMS59_DP1:
- case DCB_CONNECTOR_DP :
- case DCB_CONNECTOR_mDP :
- case DCB_CONNECTOR_USB_C : args->v0.type = NVIF_CONN_V0_DP; break;
- case DCB_CONNECTOR_eDP : args->v0.type = NVIF_CONN_V0_EDP; break;
- case DCB_CONNECTOR_HDMI_0 :
- case DCB_CONNECTOR_HDMI_1 :
- case DCB_CONNECTOR_HDMI_C : args->v0.type = NVIF_CONN_V0_HDMI; break;
+ /* VGA */
+ case DCB_CONNECTOR_DVI_A :
+ case DCB_CONNECTOR_POD_VGA :
+ case DCB_CONNECTOR_VGA : args->v0.type = NVIF_CONN_V0_VGA; break;
+
+ /* TV */
+ case DCB_CONNECTOR_TV_0 :
+ case DCB_CONNECTOR_TV_1 :
+ case DCB_CONNECTOR_TV_2 :
+ case DCB_CONNECTOR_TV_SCART :
+ case DCB_CONNECTOR_TV_SCART_D :
+ case DCB_CONNECTOR_TV_DTERM :
+ case DCB_CONNECTOR_POD_TV_3 :
+ case DCB_CONNECTOR_POD_TV_1 :
+ case DCB_CONNECTOR_POD_TV_0 :
+ case DCB_CONNECTOR_TV_3 : args->v0.type = NVIF_CONN_V0_TV; break;
+
+ /* DVI */
+ case DCB_CONNECTOR_DVI_I_TV_1 :
+ case DCB_CONNECTOR_DVI_I_TV_0 :
+ case DCB_CONNECTOR_DVI_I_TV_2 :
+ case DCB_CONNECTOR_DVI_ADC :
+ case DCB_CONNECTOR_DMS59_0 :
+ case DCB_CONNECTOR_DMS59_1 :
+ case DCB_CONNECTOR_DVI_I : args->v0.type = NVIF_CONN_V0_DVI_I; break;
+ case DCB_CONNECTOR_TMDS :
+ case DCB_CONNECTOR_DVI_D : args->v0.type = NVIF_CONN_V0_DVI_D; break;
+
+ /* LVDS */
+ case DCB_CONNECTOR_LVDS : args->v0.type = NVIF_CONN_V0_LVDS; break;
+ case DCB_CONNECTOR_LVDS_SPWG : args->v0.type = NVIF_CONN_V0_LVDS_SPWG;
break;
+
+ /* DP */
+ case DCB_CONNECTOR_DMS59_DP0 :
+ case DCB_CONNECTOR_DMS59_DP1 :
+ case DCB_CONNECTOR_DP :
+ case DCB_CONNECTOR_mDP :
+ case DCB_CONNECTOR_USB_C : args->v0.type = NVIF_CONN_V0_DP; break;
+ case DCB_CONNECTOR_eDP : args->v0.type = NVIF_CONN_V0_EDP; break;
+
+ /* HDMI */
+ case DCB_CONNECTOR_HDMI_0 :
+ case DCB_CONNECTOR_HDMI_1 :
+ case DCB_CONNECTOR_HDMI_C : args->v0.type = NVIF_CONN_V0_HDMI; break;
+
+ /*
+ * Dock & unused outputs.
+ * BNC, SPDIF, WFD, and detached LVDS go here.
+ */
default:
- WARN_ON(1);
+ nvkm_warn(&(disp->engine.subdev),
+ "unimplemented connector type 0x%02x\n",
+ conn->info.type);
+ args->v0.type = NVIF_CONN_V0_VGA;
ret = -EINVAL;
break;
}
--
2.51.1