From: Wesley Chalmers <wesley.chalm...@amd.com>
[WHY]
DP specifies that an LTTPR device is only present if PHY_REPEATER_CNT is
0x80, 0x40, 0x20, 0x10, 0x08, 0x04, 0x02, or 0x01.
All other values should be considered no LTTPRs present.
[HOW]
Function dp_convert_to_count already does this check. Use it to determine
if PHY_REPEATER_CNT is a valid LTTPR count.
Signed-off-by: Wesley Chalmers <wesley.chalm...@amd.com>
Reviewed-by: Jun Lei <jun....@amd.com>
Acked-by: Anson Jacob <anson.ja...@amd.com>
---
drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
index c68b49a14f88..7e52bb3047bc 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
@@ -3699,8 +3699,7 @@ bool dp_retrieve_lttpr_cap(struct dc_link *link)
DP_LT_TUNABLE_PHY_REPEATER_FIELD_DATA_STRUCTURE_REV];
/* Attempt to train in LTTPR transparent mode if repeater count
exceeds 8. */
- is_lttpr_present = (link->dpcd_caps.lttpr_caps.phy_repeater_cnt
> 0 &&
- link->dpcd_caps.lttpr_caps.phy_repeater_cnt <
0xff &&
+ is_lttpr_present =
(dp_convert_to_count(link->dpcd_caps.lttpr_caps.phy_repeater_cnt) != 0 &&
link->dpcd_caps.lttpr_caps.max_lane_count > 0 &&
link->dpcd_caps.lttpr_caps.max_lane_count <= 4
&&
link->dpcd_caps.lttpr_caps.revision.raw >=
0x14);
--
2.25.1
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