commit
eb28018943fed7639dfea1c9ec9c756ec692b99a upstream.
[WHY]
Handover from DMUB to driver does not perform link rate toggle.
It might cause link training failure for boot up.
[HOW]
Force toggle rate wa for first link train.
link->vendor_specific_lttpr_link_rate_wa should be zero then.
Cc: stable@vger.kernel.org # 6.1+
Reviewed-by: Michael Strauss <michael.strauss@amd.com>
Acked-by: Hamza Mahfooz <hamza.mahfooz@amd.com>
Signed-off-by: Zhongwei <zhongwei.zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
lt_settings->cr_pattern_time = 16000;
/* Fixed VS/PE specific: Toggle link rate */
lt_settings->cr_pattern_time = 16000;
/* Fixed VS/PE specific: Toggle link rate */
- apply_toggle_rate_wa = (link->vendor_specific_lttpr_link_rate_wa == target_rate);
+ apply_toggle_rate_wa = ((link->vendor_specific_lttpr_link_rate_wa == target_rate) || (link->vendor_specific_lttpr_link_rate_wa == 0));
target_rate = get_dpcd_link_rate(<_settings->link_settings);
toggle_rate = (target_rate == 0x6) ? 0xA : 0x6;
target_rate = get_dpcd_link_rate(<_settings->link_settings);
toggle_rate = (target_rate == 0x6) ? 0xA : 0x6;
/* Vendor specific: Toggle link rate */
toggle_rate = (rate == 0x6) ? 0xA : 0x6;
/* Vendor specific: Toggle link rate */
toggle_rate = (rate == 0x6) ? 0xA : 0x6;
- if (link->vendor_specific_lttpr_link_rate_wa == rate) {
+ 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,
core_link_write_dpcd(
link,
DP_LINK_BW_SET,
/* Vendor specific: Toggle link rate */
toggle_rate = (rate == 0x6) ? 0xA : 0x6;
/* Vendor specific: Toggle link rate */
toggle_rate = (rate == 0x6) ? 0xA : 0x6;
- if (link->vendor_specific_lttpr_link_rate_wa == rate) {
+ 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,
core_link_write_dpcd(
link,
DP_LINK_BW_SET,