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drm/amd/display: Always write repeater mode regardless of LTTPR

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[WHY]
SCR for DP2.0 requires that LT be performed with PHY_REPEATER_MODE
programmed to 0x55 (Transparent) whenever PHY_REPEATER_CNT is any value
other than 0x80, 0x40, 0x20, 0x10, 0x08, 0x04, 0x02, or 0x01.

[HOW]
Write Non-Transparent (0xAA) to PHY_REPEATER_MODE when LTTPRs detected and Non-Transparent is
requested.
Write Transparent in all other cases.

Signed-off-by: Wesley Chalmers <Wesley.Chalmers@amd.com>
Reviewed-by: Jun Lei <Jun.Lei@amd.com>
Acked-by: Anson Jacob <Anson.Jacob@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Wesley Chalmers 2021-03-30 18:30:13 -04:00 committed by Alex Deucher
parent ac62875e9b
commit 2b7605d73b
1 changed files with 3 additions and 4 deletions
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7
drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
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@ -1618,11 +1618,10 @@ enum dc_status dpcd_configure_lttpr_mode(struct dc_link *link, struct link_train
{
enum dc_status status = DC_OK;
if (lt_settings->lttpr_mode == LTTPR_MODE_TRANSPARENT)
status = configure_lttpr_mode_transparent(link);
else if (lt_settings->lttpr_mode == LTTPR_MODE_NON_TRANSPARENT)
if (lt_settings->lttpr_mode == LTTPR_MODE_NON_TRANSPARENT)
status = configure_lttpr_mode_non_transparent(link, lt_settings);
else
status = configure_lttpr_mode_transparent(link);
return status;
}