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drm/amd/display: limit DPIA link rate to HBR3

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commit 0e69ef6ea82e8eece7d2b2b45a0da9670eaaefff upstream.

[Why]
DPIA doesn't support UHBR, driver should not enable UHBR
for dp tunneling

[How]
limit DPIA link rate to HBR3

Cc: Mario Limonciello <mario.limonciello@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Acked-by: Stylon Wang <stylon.wang@amd.com>
Signed-off-by: Peichen Huang <peichen.huang@amd.com>
Reviewed-by: Mustapha Ghaddar <Mustapha.Ghaddar@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Peichen Huang 2023-05-31 13:36:14 +08:00 • committed by Greg Kroah-Hartman
parent 10347b115d
commit 3d3fd58bfc
1 changed files with 5 additions and 0 deletions
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5
drivers/gpu/drm/amd/display/dc/core/dc_link.c
View file

@ -1141,6 +1141,11 @@ static bool detect_link_and_local_sink(struct dc_link *link,
(link->dpcd_caps.dongle_type !=
DISPLAY_DONGLE_DP_HDMI_CONVERTER))
converter_disable_audio = true;
/* limited link rate to HBR3 for DPIA until we implement USB4 V2 */
if (link->ep_type == DISPLAY_ENDPOINT_USB4_DPIA &&
link->reported_link_cap.link_rate > LINK_RATE_HIGH3)
link->reported_link_cap.link_rate = LINK_RATE_HIGH3;
break;
}