From: Martin Tsai <martin.tsai@xxxxxxx>
[Why]
Some sprcified monitor scalar cannot recognize timing
change on demand. Once the link phy disable and enable
during a short period then the Sink protection mechanism
could keep the screen in blank and cannot be recoverred.
[How]
To add 100ms delay between enable link phy and link training.
Signed-off-by: Martin Tsai <martin.tsai@xxxxxxx>
Reviewed-by: Aric Cyr <Aric.Cyr@xxxxxxx>
Acked-by: Qingqing Zhuo <qingqing.zhuo@xxxxxxx>
---
drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c | 7 ++++---
drivers/gpu/drm/amd/display/dc/dc.h | 1 +
2 files changed, 5 insertions(+), 3 deletions(-)
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 08c3b32e188c..674f53aaf2b4 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
@@ -1559,9 +1559,10 @@ bool perform_link_training_with_retries(
pipe_ctx->clock_source->id,
link_setting);
- if (stream->sink_patches.dppowerup_delay > 0) {
- int delay_dp_power_up_in_ms = stream->sink_patches.dppowerup_delay;
-
+ if ((link && link->dc->debug.dppowerup_delay > 0) || stream->sink_patches.dppowerup_delay > 0) {
+ int delay_dp_power_up_in_ms =
+ (link->dc->debug.dppowerup_delay >= stream->sink_patches.dppowerup_delay) ?
+ link->dc->debug.dppowerup_delay : stream->sink_patches.dppowerup_delay;
msleep(delay_dp_power_up_in_ms);
}
diff --git a/drivers/gpu/drm/amd/display/dc/dc.h b/drivers/gpu/drm/amd/display/dc/dc.h
index 8cdbfa15874b..9138adf63f9f 100644
--- a/drivers/gpu/drm/amd/display/dc/dc.h
+++ b/drivers/gpu/drm/amd/display/dc/dc.h
@@ -498,6 +498,7 @@ struct dc_debug_options {
bool usbc_combo_phy_reset_wa;
bool disable_dsc;
bool enable_dram_clock_change_one_display_vactive;
+ unsigned int dppowerup_delay;
};
struct dc_debug_data {
--
2.17.1
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