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drm/amd/display: Don't perform rate toggle on DP2-capable FIXED_VS retimers

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[WHY]
Only required if FIXED_VS retimer does not support DP2-capable.

[HOW]
Gate link rate toggle with DP 128b/132b LTTPR channel coding cap check.

Reviewed-by: Charlene Liu <charlene.liu@amd.com>
Acked-by: Hamza Mahfooz <hamza.mahfooz@amd.com>
Signed-off-by: Michael Strauss <michael.strauss@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Michael Strauss
2024-01-16 13:46:53 -05:00
committed by Alex Deucher
parent 5a2df8ecba
commit 70efd04220
1 changed files with 12 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files
drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_training_fixed_vs_pe_retimer.c
+12 -10
View File
@@ -270,19 +270,21 @@ enum link_training_result dp_perform_fixed_vs_pe_training_sequence(
rate = get_dpcd_link_rate(&lt_settings->link_settings);
/* Vendor specific: Toggle link rate */
toggle_rate = (rate == 0x6) ? 0xA : 0x6;
if (!link->dpcd_caps.lttpr_caps.main_link_channel_coding.bits.DP_128b_132b_SUPPORTED) {
/* Vendor specific: Toggle link rate */
toggle_rate = (rate == 0x6) ? 0xA : 0x6;
if (link->vendor_specific_lttpr_link_rate_wa == rate || link->vendor_specific_lttpr_link_rate_wa == 0) {
core_link_write_dpcd(
link,
DP_LINK_BW_SET,
&toggle_rate,
1);
if (link->vendor_specific_lttpr_link_rate_wa == rate || link->vendor_specific_lttpr_link_rate_wa == 0) {
core_link_write_dpcd(
link,
DP_LINK_BW_SET,
&toggle_rate,
1);
}
link->vendor_specific_lttpr_link_rate_wa = rate;
}
link->vendor_specific_lttpr_link_rate_wa = rate;
core_link_write_dpcd(link, DP_LINK_BW_SET, &rate, 1);
DC_LOG_HW_LINK_TRAINING("%s\n %x rate = %x\n %x lane = %x framing = %x\n %x spread = %x\n",