7.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Timur Kristóf <redacted>

[ Upstream commit 880498a1943f865529819f778df3b9945ca57262 ]

When the DDC channel ID is set to CHANNEL_ID_UNKNOWN,
pass NULL to the AUX regs array.

This is necessary to support embedded connectors without DDC.

Fixes: 7c15fd86aaec ("drm/amd/display: dc/dce: add initial DCE6 support (v10)")
Link: https://gitlab.freedesktop.org/drm/amd/-/work_items/5192
Signed-off-by: Timur Kristóf <redacted>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 38a70e50b22a188ff601740d64dd75f46213121f)
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/gpu/drm/amd/display/dc/resource/dce60/dce60_resource.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/resource/dce60/dce60_resource.c b/drivers/gpu/drm/amd/display/dc/resource/dce60/dce60_resource.c
index 3d52973dd7f20..15f220671fbed 100644
--- a/drivers/gpu/drm/amd/display/dc/resource/dce60/dce60_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/resource/dce60/dce60_resource.c

@@ -753,7 +753,8 @@ static struct link_encoder *dce60_link_encoder_create(
 				     enc_init_data,
 				     &link_enc_feature,
 				     &link_enc_regs[link_regs_id],
-				     &link_enc_aux_regs[enc_init_data->channel - 1],
+				     enc_init_data->channel == CHANNEL_ID_UNKNOWN ?
+				     NULL : &link_enc_aux_regs[enc_init_data->channel - 1],
 				     enc_init_data->hpd_source >= ARRAY_SIZE(link_enc_hpd_regs) ?
 				     NULL : &link_enc_hpd_regs[enc_init_data->hpd_source]);
 	return &enc110->base;

-- 
2.53.0