From 85f96dc5c2e5bfcd47760f70f76b58b8168933b5 Mon Sep 17 00:00:00 2001
From: Meenakshikumar Somasundaram <meenakshikumar.somasundaram@amd.com>
Date: Thu, 4 Nov 2021 16:52:09 -0400
Subject: drm/amd/display: Add hpd pending flag to indicate detection of new
hpd
Git-commit: 6ef86fa8ccc8a3200fc89e8c9b50f1b90144b65c
Patch-mainline: v5.17-rc1
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225
[Why]
For dpia link, link->hpd_status indicates current state, but driver
fails to capture hpd transitions in certain scenarios such as during
link training.
[How]
Added link->hpd_pending flag that captures arrival of new hpd.
Reviewed-by: Jun Lei <Jun.Lei@amd.com>
Acked-by: Anson Jacob <Anson.Jacob@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Meenakshikumar Somasundaram <meenakshikumar.somasundaram@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
drivers/gpu/drm/amd/display/dc/core/dc_link.c | 6 +++---
.../drm/amd/display/dc/core/dc_link_dpia.c | 20 +++++++++----------
drivers/gpu/drm/amd/display/dc/dc_link.h | 1 +
3 files changed, 14 insertions(+), 13 deletions(-)
diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link.c b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
index 207ed5cf3270..e0168e6b3277 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
@@ -270,10 +270,10 @@ bool dc_link_detect_sink(struct dc_link *link, enum dc_connection_type *type)
/* Link may not have physical HPD pin. */
if (link->ep_type != DISPLAY_ENDPOINT_PHY) {
- if (link->hpd_status)
- *type = dc_connection_single;
- else
+ if (link->is_hpd_pending || !link->hpd_status)
*type = dc_connection_none;
+ else
+ *type = dc_connection_single;
return true;
}
diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_dpia.c b/drivers/gpu/drm/amd/display/dc/core/dc_link_dpia.c
index b1c9f77d6bf4..d72122593959 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link_dpia.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_dpia.c
@@ -94,17 +94,17 @@ static enum link_training_result dpia_configure_link(struct dc_link *link,
lt_settings);
status = dpcd_configure_channel_coding(link, lt_settings);
- if (status != DC_OK && !link->hpd_status)
+ if (status != DC_OK && link->is_hpd_pending)
return LINK_TRAINING_ABORT;
/* Configure lttpr mode */
status = dpcd_configure_lttpr_mode(link, lt_settings);
- if (status != DC_OK && !link->hpd_status)
+ if (status != DC_OK && link->is_hpd_pending)
return LINK_TRAINING_ABORT;
/* Set link rate, lane count and spread. */
status = dpcd_set_link_settings(link, lt_settings);
- if (status != DC_OK && !link->hpd_status)
+ if (status != DC_OK && link->is_hpd_pending)
return LINK_TRAINING_ABORT;
if (link->preferred_training_settings.fec_enable)
@@ -112,7 +112,7 @@ static enum link_training_result dpia_configure_link(struct dc_link *link,
else
fec_enable = true;
status = dp_set_fec_ready(link, fec_enable);
- if (status != DC_OK && !link->hpd_status)
+ if (status != DC_OK && link->is_hpd_pending)
return LINK_TRAINING_ABORT;
return LINK_TRAINING_SUCCESS;
@@ -388,7 +388,7 @@ static enum link_training_result dpia_training_cr_non_transparent(struct dc_link
}
/* Abort link training if clock recovery failed due to HPD unplug. */
- if (!link->hpd_status)
+ if (link->is_hpd_pending)
result = LINK_TRAINING_ABORT;
DC_LOG_HW_LINK_TRAINING("%s\n DPIA(%d) clock recovery\n"
@@ -490,7 +490,7 @@ static enum link_training_result dpia_training_cr_transparent(struct dc_link *li
}
/* Abort link training if clock recovery failed due to HPD unplug. */
- if (!link->hpd_status)
+ if (link->is_hpd_pending)
result = LINK_TRAINING_ABORT;
DC_LOG_HW_LINK_TRAINING("%s\n DPIA(%d) clock recovery\n"
@@ -675,7 +675,7 @@ static enum link_training_result dpia_training_eq_non_transparent(struct dc_link
}
/* Abort link training if equalization failed due to HPD unplug. */
- if (!link->hpd_status)
+ if (link->is_hpd_pending)
result = LINK_TRAINING_ABORT;
DC_LOG_HW_LINK_TRAINING("%s\n DPIA(%d) equalization\n"
@@ -758,7 +758,7 @@ static enum link_training_result dpia_training_eq_transparent(struct dc_link *li
}
/* Abort link training if equalization failed due to HPD unplug. */
- if (!link->hpd_status)
+ if (link->is_hpd_pending)
result = LINK_TRAINING_ABORT;
DC_LOG_HW_LINK_TRAINING("%s\n DPIA(%d) equalization\n"
@@ -892,10 +892,10 @@ static void dpia_training_abort(struct dc_link *link, uint32_t hop)
__func__,
link->link_id.enum_id - ENUM_ID_1,
link->lttpr_mode,
- link->hpd_status);
+ link->is_hpd_pending);
/* Abandon clean-up if sink unplugged. */
- if (!link->hpd_status)
+ if (link->is_hpd_pending)
return;
if (hop != DPRX)
diff --git a/drivers/gpu/drm/amd/display/dc/dc_link.h b/drivers/gpu/drm/amd/display/dc/dc_link.h
index a003f9efe31b..37af564c4b33 100644
--- a/drivers/gpu/drm/amd/display/dc/dc_link.h
+++ b/drivers/gpu/drm/amd/display/dc/dc_link.h
@@ -113,6 +113,7 @@ struct dc_link {
* DIG encoder. */
bool is_dig_mapping_flexible;
bool hpd_status; /* HPD status of link without physical HPD pin. */
+ bool is_hpd_pending; /* Indicates a new received hpd */
bool edp_sink_present;
--
2.38.1