samsung_sm8750/android_kernel_samsung_sm8750
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

drm/amd/display: Update CR AUX RD interval interpretation

Browse Source 
[ Upstream commit 6a7fde433231c18164c117592d3e18ced648ad58 ]

[Why]
DP spec updated to have the CR AUX RD interval match the EQ AUX RD
interval interpretation of DPCD 0000Eh/0220Eh for 8b/10b non-LTTPR mode
and LTTPR transparent mode cases.

[How]
Update interpretation of DPCD 0000Eh/0220Eh for CR AUX RD interval
during 8b/10b link training.

Reviewed-by: Michael Strauss <michael.strauss@amd.com>
Reviewed-by: Wenjing Liu <wenjing.liu@amd.com>
Signed-off-by: George Shen <george.shen@amd.com>
Signed-off-by: Zaeem Mohamed <zaeem.mohamed@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>
This commit is contained in:
George Shen
2025-01-10 11:35:46 -05:00
committed by Greg Kroah-Hartman
parent af2d36316a
commit c59c96b850
1 changed files with 5 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_training_8b_10b.c
View File

@@ -36,7 +36,8 @@
link->ctx->logger
static int32_t get_cr_training_aux_rd_interval(struct dc_link *link,
const struct dc_link_settings *link_settings)
const struct dc_link_settings *link_settings,
enum lttpr_mode lttpr_mode)
{
union training_aux_rd_interval training_rd_interval;
uint32_t wait_in_micro_secs = 100;
@@ -49,6 +50,8 @@ static int32_t get_cr_training_aux_rd_interval(struct dc_link *link,
DP_TRAINING_AUX_RD_INTERVAL,
(uint8_t *)&training_rd_interval,
sizeof(training_rd_interval));
if (lttpr_mode != LTTPR_MODE_NON_TRANSPARENT)
wait_in_micro_secs = 400;
if (training_rd_interval.bits.TRAINIG_AUX_RD_INTERVAL)
wait_in_micro_secs = training_rd_interval.bits.TRAINIG_AUX_RD_INTERVAL * 4000;
}
@@ -110,7 +113,6 @@ void decide_8b_10b_training_settings(
*/
lt_settings->link_settings.link_spread = link->dp_ss_off ?
LINK_SPREAD_DISABLED : LINK_SPREAD_05_DOWNSPREAD_30KHZ;
lt_settings->cr_pattern_time = get_cr_training_aux_rd_interval(link, link_setting);
lt_settings->eq_pattern_time = get_eq_training_aux_rd_interval(link, link_setting);
lt_settings->pattern_for_cr = decide_cr_training_pattern(link_setting);
lt_settings->pattern_for_eq = decide_eq_training_pattern(link, link_setting);
@@ -119,6 +121,7 @@ void decide_8b_10b_training_settings(
lt_settings->disallow_per_lane_settings = true;
lt_settings->always_match_dpcd_with_hw_lane_settings = true;
lt_settings->lttpr_mode = dp_decide_8b_10b_lttpr_mode(link);
lt_settings->cr_pattern_time = get_cr_training_aux_rd_interval(link, link_setting, lt_settings->lttpr_mode);
dp_hw_to_dpcd_lane_settings(lt_settings, lt_settings->hw_lane_settings, lt_settings->dpcd_lane_settings);
}