From: Harry Wentland <harry.wentland@xxxxxxx>
[Why]
For debugging reasons it can be beneficial to disable any hotplug and DP shortpulse interrupt handling.
[How]
Expose a debugfs to set a flag to bypass HPD IRQ handling and skip IRQ handling if flag is set.
Signed-off-by: Harry Wentland <harry.wentland@xxxxxxx>
Acked-by: Bindu Ramamurthy <bindur12@xxxxxxx>
---
.../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 9 ++++-
.../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h | 3 +-
.../amd/display/amdgpu_dm/amdgpu_dm_debugfs.c | 35 +++++++++++++++++++
3 files changed, 45 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index 7dc7389e337f..e29cb2e956db 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -2553,11 +2553,14 @@ static void handle_hpd_irq(void *param)
struct drm_connector *connector = &aconnector->base;
struct drm_device *dev = connector->dev;
enum dc_connection_type new_connection_type = dc_connection_none;
-#ifdef CONFIG_DRM_AMD_DC_HDCP
struct amdgpu_device *adev = drm_to_adev(dev);
+#ifdef CONFIG_DRM_AMD_DC_HDCP
struct dm_connector_state *dm_con_state = to_dm_connector_state(connector->state);
#endif
+ if (adev->dm.disable_hpd_irq)
+ return;
+
/*
* In case of failure or MST no need to update connector status or notify the OS
* since (for MST case) MST does this in its own context.
@@ -2697,6 +2700,10 @@ static void handle_hpd_rx_irq(void *param)
memset(&hpd_irq_data, 0, sizeof(hpd_irq_data));
+ if (adev->dm.disable_hpd_irq)
+ return;
+
+
/*
* TODO:Temporary add mutex to protect hpd interrupt not have a gpio
* conflict, after implement i2c helper, this mutex should be
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
index 13f3db14b265..77e338b3ab6b 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
@@ -1,5 +1,5 @@
/*
- * Copyright 2015 Advanced Micro Devices, Inc.
+ * Copyright (C) 2015-2020 Advanced Micro Devices, Inc. All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
@@ -410,6 +410,7 @@ struct amdgpu_display_manager {
*/
struct amdgpu_encoder mst_encoders[AMDGPU_DM_MAX_CRTC];
bool force_timing_sync;
+ bool disable_hpd_irq;
bool dmcub_trace_event_en;
/**
* @da_list:
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
index 9a13f47022df..529545045a3e 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
@@ -3077,6 +3077,37 @@ static int force_timing_sync_get(void *data, u64 *val)
DEFINE_DEBUGFS_ATTRIBUTE(force_timing_sync_ops, force_timing_sync_get,
force_timing_sync_set, "%llu\n");
+
+/*
+ * Disables all HPD and HPD RX interrupt handling in the
+ * driver when set to 1. Default is 0.
+ */
+static int disable_hpd_set(void *data, u64 val)
+{
+ struct amdgpu_device *adev = data;
+
+ adev->dm.disable_hpd_irq = (bool)val;
+
+ return 0;
+}
+
+
+/*
+ * Returns 1 if HPD and HPRX interrupt handling is disabled,
+ * 0 otherwise.
+ */
+static int disable_hpd_get(void *data, u64 *val)
+{
+ struct amdgpu_device *adev = data;
+
+ *val = adev->dm.disable_hpd_irq;
+
+ return 0;
+}
+
+DEFINE_DEBUGFS_ATTRIBUTE(disable_hpd_ops, disable_hpd_get,
+ disable_hpd_set, "%llu\n");
+
/*
* Sets the DC visual confirm debug option from the given string.
* Example usage: echo 1 > /sys/kernel/debug/dri/0/amdgpu_visual_confirm
@@ -3213,4 +3244,8 @@ void dtn_debugfs_init(struct amdgpu_device *adev)
debugfs_create_file_unsafe("amdgpu_dm_dcc_en", 0644, root, adev,
&dcc_en_bits_fops);
+
+ debugfs_create_file_unsafe("amdgpu_dm_disable_hpd", 0644, root, adev,
+ &disable_hpd_ops);
+
}
--
2.25.1
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