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| author | Peichen Huang <peichen.huang@amd.com> | 2023-05-31 13:36:14 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-08-16 18:27:22 +0200 |
| commit | 3d3fd58bfca151028859cc23757191fa2f65f679 (patch) | |
| tree | 6a3fa16fc7389d862582b29211c1985277a701bb /drivers/gpu | |
| parent | 10347b115da1029f4a25b69129294b3854144d6a (diff) | |
| download | linux-3d3fd58bfca151028859cc23757191fa2f65f679.tar.gz | |
drm/amd/display: limit DPIA link rate to HBR3
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>
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/core/dc_link.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link.c b/drivers/gpu/drm/amd/display/dc/core/dc_link.c index c2c6c4587a5c..bbaeb6c567d0 100644 --- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c +++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c @@ -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; } |