Commit b972b4f9 authored by Harry Wentland's avatar Harry Wentland Committed by Alex Deucher

drm/amd/display: Add debugfs to repress HPD and HPR_RX IRQs

[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: default avatarHarry Wentland <harry.wentland@amd.com>
Acked-by: default avatarBindu Ramamurthy <bindur12@amd.com>
Tested-by: default avatarDaniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 83d76eeb
......@@ -2552,11 +2552,14 @@ 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.
......@@ -2696,6 +2699,10 @@ 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
......
/*
* 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:
......
......@@ -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);
}
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