linux-kernel - [PATCH 5.19 30/48] drm/amd/display: Assume an LTTPR is always present on fixed

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Mon, 10 Oct 2022 09:05:28 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, George Shen <George.Shen@....com>,
        Wayne Lin <wayne.lin@....com>,
        Michael Strauss <michael.strauss@....com>,
        Daniel Wheeler <daniel.wheeler@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.19 30/48] drm/amd/display: Assume an LTTPR is always present on fixed_vs links

From: Michael Strauss <michael.strauss@....com>

[ Upstream commit 29956d0fded036a570bd8e7d4ea4b1a1730307d2 ]

[WHY]
LTTPRs can in very rare instsances fail to increment DPCD LTTPR count.
This results in aux-i LTTPR requests to be sent to the wrong DPCD
address, which causes link training failure.

[HOW]
Override internal repeater count if fixed_vs flag is set for a given link

Reviewed-by: George Shen <George.Shen@....com>
Acked-by: Wayne Lin <wayne.lin@....com>
Signed-off-by: Michael Strauss <michael.strauss@....com>
Tested-by: Daniel Wheeler <daniel.wheeler@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c | 8 ++++++++
 1 file changed, 8 insertions(+)

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 a4fc9a6c850e..0c52506b367d 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
@@ -5211,6 +5211,14 @@ bool dp_retrieve_lttpr_cap(struct dc_link *link)
 				lttpr_dpcd_data[DP_PHY_REPEATER_128B132B_RATES -
 								DP_LT_TUNABLE_PHY_REPEATER_FIELD_DATA_STRUCTURE_REV];
 
+		/* If this chip cap is set, at least one retimer must exist in the chain
+		 * Override count to 1 if we receive a known bad count (0 or an invalid value) */
+		if (link->chip_caps & EXT_DISPLAY_PATH_CAPS__DP_FIXED_VS_EN &&
+				(dp_convert_to_count(link->dpcd_caps.lttpr_caps.phy_repeater_cnt) == 0)) {
+			ASSERT(0);
+			link->dpcd_caps.lttpr_caps.phy_repeater_cnt = 0x80;
+		}
+
 		/* Attempt to train in LTTPR transparent mode if repeater count exceeds 8. */
 		is_lttpr_present = (link->dpcd_caps.lttpr_caps.max_lane_count > 0 &&
 				link->dpcd_caps.lttpr_caps.max_lane_count <= 4 &&
-- 
2.35.1