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drm/amd/display: add a debug option to force dp2 lt fallback method

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[why]
A debug option is needed to temporarily force dp2 new link training
fallback method for debugging purpose.

Reviewed-by: George Shen <George.Shen@amd.com>
Acked-by: Pavle Kotarac <Pavle.Kotarac@amd.com>
Signed-off-by: Wenjing Liu <wenjing.liu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Wenjing Liu 2021-11-26 14:18:59 -05:00 • committed by Alex Deucher
parent eb9e59ebfe
commit 800de20b1d
2 changed files with 7 additions and 3 deletions
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9
drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
View file

@ -100,6 +100,7 @@ static const struct dp_lt_fallback_entry dp_lt_fallbacks[] = {
#endif
static bool decide_fallback_link_setting(
struct dc_link *link,
struct dc_link_settings initial_link_settings,
struct dc_link_settings *current_link_setting,
enum link_training_result training_result);
@ -2609,7 +2610,7 @@ bool perform_link_training_with_retries(
uint32_t req_bw;
uint32_t link_bw;
decide_fallback_link_setting(*link_setting, &current_setting, status);
decide_fallback_link_setting(link, *link_setting, &current_setting, status);
/* Fail link training if reduced link bandwidth no longer meets
* stream requirements.
*/
@ -3124,7 +3125,7 @@ bool dp_verify_link_cap(
* based on the actual mode we're driving
*/
dp_disable_link_phy(link, link->connector_signal);
} while (!success && decide_fallback_link_setting(
} while (!success && decide_fallback_link_setting(link,
initial_link_settings, cur, status));
/* Link Training failed for all Link Settings
@ -3376,6 +3377,7 @@ static bool decide_fallback_link_setting_max_bw_policy(
* and no further fallback could be done
*/
static bool decide_fallback_link_setting(
struct dc_link *link,
struct dc_link_settings initial_link_settings,
struct dc_link_settings *current_link_setting,
enum link_training_result training_result)
@ -3383,7 +3385,8 @@ static bool decide_fallback_link_setting(
if (!current_link_setting)
return false;
#if defined(CONFIG_DRM_AMD_DC_DCN)
if (dp_get_link_encoding_format(&initial_link_settings) == DP_128b_132b_ENCODING)
if (dp_get_link_encoding_format(&initial_link_settings) == DP_128b_132b_ENCODING ||
link->dc->debug.force_dp2_lt_fallback_method)
return decide_fallback_link_setting_max_bw_policy(&initial_link_settings,
current_link_setting);
#endif

1
drivers/gpu/drm/amd/display/dc/dc.h
View file

@ -691,6 +691,7 @@ struct dc_debug_options {
/* TODO - remove once tested */
bool legacy_dp2_lt;
bool set_mst_en_for_sst;
bool force_dp2_lt_fallback_method;
#endif
union mem_low_power_enable_options enable_mem_low_power;
union root_clock_optimization_options root_clock_optimization;