[PATCH v2 2/2] drm/amd/display: Fix DMUB errors introduced by DML2

[Rodrigo Siqueira]

When DML 2 was introduced, it changed part of the generic sequence of
DC, which caused issues on previous DCNs with DMUB support. This commit
ensures the new sequence only works for new DCNs from 3.5 and above.

Changes since V1:
- Harry: Use the attribute using_dml2 instead of check the DCN version.

Cc: Vitaly Prosyak <vprosyak at amd.com>
Cc: Roman Li <roman.li at amd.com>
Cc: Qingqing Zhuo <Qingqing.Zhuo at amd.com>
Cc: Daniel Wheeler <daniel.wheeler at amd.com>
Cc: Alex Deucher <Alexander.Deucher at amd.com>
Fixes: 7966f319c66d ("drm/amd/display: Introduce DML2")
Signed-off-by: Rodrigo Siqueira <Rodrigo.Siqueira at amd.com>
---
 drivers/gpu/drm/amd/display/dc/core/dc_resource.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_resource.c b/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
index 97f402123fbb..f9e472f08e21 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
@@ -321,10 +321,11 @@ struct resource_pool *dc_create_resource_pool(struct dc  *dc,
 				res_pool->ref_clocks.xtalin_clock_inKhz;
 			res_pool->ref_clocks.dchub_ref_clock_inKhz =
 				res_pool->ref_clocks.xtalin_clock_inKhz;
-			if (res_pool->hubbub && res_pool->hubbub->funcs->get_dchub_ref_freq)
-				res_pool->hubbub->funcs->get_dchub_ref_freq(res_pool->hubbub,
-					res_pool->ref_clocks.dccg_ref_clock_inKhz,
-					&res_pool->ref_clocks.dchub_ref_clock_inKhz);
+			if (dc->debug.using_dml2)
+				if (res_pool->hubbub && res_pool->hubbub->funcs->get_dchub_ref_freq)
+					res_pool->hubbub->funcs->get_dchub_ref_freq(res_pool->hubbub,
+										    res_pool->ref_clocks.dccg_ref_clock_inKhz,
+										    &res_pool->ref_clocks.dchub_ref_clock_inKhz);
 		} else
 			ASSERT_CRITICAL(false);
 	}
-- 
2.42.0