[PATCH] 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.

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..73cc6e1b0e65 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_version >= DCN_VERSION_3_5)
+				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