drm/amd/display: Fix DPCD translation for LTTPR AUX_RD_INTERVAL

[ Upstream commit 2b6b7ab4b1cabfbee1af5d818efcab5d51d62c7e ]

[Why]
The translation between the DPCD value and the specified AUX_RD_INTERVAL
in the DP spec do not match.

[How]
Update values to match the spec.

Signed-off-by: George Shen <george.shen@amd.com>
Reviewed-by: Wenjing Liu <Wenjing.Liu@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>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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 17e6fd8..32b73ea 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
@@ -877,13 +877,13 @@ static uint32_t translate_training_aux_read_interval(uint32_t dpcd_aux_read_inte
 
        switch (dpcd_aux_read_interval) {
        case 0x01:
-               aux_rd_interval_us = 400;
+               aux_rd_interval_us = 4000;
                break;
        case 0x02:
-               aux_rd_interval_us = 4000;
+               aux_rd_interval_us = 8000;
                break;
        case 0x03:
-               aux_rd_interval_us = 8000;
+               aux_rd_interval_us = 12000;
                break;
        case 0x04:
                aux_rd_interval_us = 16000;