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drm/amd/display: Properly handle additional cases where DCN is not supported

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[ Upstream commit 6fc547a5a2ef5ce05b16924106663ab92f8f87a7 ]

There could be boards with DCN listed in IP discovery, but no
display hardware actually wired up.  In this case the vbios
display table will not be populated.  Detect this case and
skip loading DM when we detect it.

v2: Mark DCN as harvested as well so other display checks
elsewhere in the driver are handled properly.

Cc: Aurabindo Pillai <aurabindo.pillai@amd.com>
Reviewed-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Alex Deucher 2023-01-25 14:35:16 -05:00 committed by Greg Kroah-Hartman
parent 5ca46a04a5
commit f1cb549bcd
1 changed files with 11 additions and 0 deletions
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11
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
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@ -4428,6 +4428,17 @@ DEVICE_ATTR_WO(s3_debug);
static int dm_early_init(void *handle)
{
struct amdgpu_device *adev = (struct amdgpu_device *)handle;
struct amdgpu_mode_info *mode_info = &adev->mode_info;
struct atom_context *ctx = mode_info->atom_context;
int index = GetIndexIntoMasterTable(DATA, Object_Header);
u16 data_offset;
/* if there is no object header, skip DM */
if (!amdgpu_atom_parse_data_header(ctx, index, NULL, NULL, NULL, &data_offset)) {
adev->harvest_ip_mask |= AMD_HARVEST_IP_DMU_MASK;
dev_info(adev->dev, "No object header, skipping DM\n");
return -ENOENT;
}
switch (adev->asic_type) {
#if defined(CONFIG_DRM_AMD_DC_SI)