[RFC PATCH] drm/amd/display: wire DCN42B mcache programming callback

[Pengpeng Hou]

DCN42B enables DML2 and DML21 by default and defines
dcn42b_prepare_mcache_programming(), but the resource function table only
wires the callback when CONFIG_DRM_AMD_DC_DML21 is defined.

There is no in-tree Kconfig symbol named DRM_AMD_DC_DML21, so the
preprocessor always removes the callback entry.  Sibling DCN42 and DCN401
resource tables wire their prepare_mcache_programming callbacks
unconditionally, and the core DC code already checks whether the callback
pointer is present before calling it.

Remove the stale guard so DCN42B exposes the callback relation that its
source and DML21 build world already provide.

This is an RFC patch draft from static conditional callback legality
auditing.  It needs AMD display maintainer review before submission as a
final fix.

Signed-off-by: Pengpeng Hou <pengpeng@xxxxxxxxxxx>
---
 drivers/gpu/drm/amd/display/dc/resource/dcn42b/dcn42b_resource.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/resource/dcn42b/dcn42b_resource.c b/drivers/gpu/drm/amd/display/dc/resource/dcn42b/dcn42b_resource.c
index 000000000000..000000000000 100644
--- a/drivers/gpu/drm/amd/display/dc/resource/dcn42b/dcn42b_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/resource/dcn42b/dcn42b_resource.c
@@ -1882,8 +1882,6 @@ static const struct resource_funcs dcn42b_res_pool_funcs = {
 	.add_phantom_pipes = dcn32_add_phantom_pipes,
 	.calculate_mall_ways_from_bytes = dcn32_calculate_mall_ways_from_bytes,
-#ifdef CONFIG_DRM_AMD_DC_DML21
 	.prepare_mcache_programming = dcn42b_prepare_mcache_programming,
-#endif
 	.build_pipe_pix_clk_params = dcn42b_build_pipe_pix_clk_params,
 	.get_power_profile = dcn401_get_power_profile,
 	.get_vstartup_for_pipe = dcn401_get_vstartup_for_pipe,
-- 
2.39.5