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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: Harry Wentland <harry.wentland@amd.com> Acked-by: Bindu Ramamurthy <bindur12@amd.com> Tested-by: Daniel Wheeler <daniel.wheeler@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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3 changed files with 45 additions and 2 deletions
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@ -2552,11 +2552,14 @@ static void handle_hpd_irq(void *param)
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struct drm_connector *connector = &aconnector->base;
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struct drm_device *dev = connector->dev;
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enum dc_connection_type new_connection_type = dc_connection_none;
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#ifdef CONFIG_DRM_AMD_DC_HDCP
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struct amdgpu_device *adev = drm_to_adev(dev);
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#ifdef CONFIG_DRM_AMD_DC_HDCP
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struct dm_connector_state *dm_con_state = to_dm_connector_state(connector->state);
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#endif
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if (adev->dm.disable_hpd_irq)
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return;
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/*
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* In case of failure or MST no need to update connector status or notify the OS
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* since (for MST case) MST does this in its own context.
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@ -2696,6 +2699,10 @@ static void handle_hpd_rx_irq(void *param)
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memset(&hpd_irq_data, 0, sizeof(hpd_irq_data));
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if (adev->dm.disable_hpd_irq)
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return;
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/*
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* TODO:Temporary add mutex to protect hpd interrupt not have a gpio
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* conflict, after implement i2c helper, this mutex should be
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@ -1,5 +1,5 @@
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/*
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* Copyright 2015 Advanced Micro Devices, Inc.
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* Copyright (C) 2015-2020 Advanced Micro Devices, Inc. All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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@ -410,6 +410,7 @@ struct amdgpu_display_manager {
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*/
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struct amdgpu_encoder mst_encoders[AMDGPU_DM_MAX_CRTC];
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bool force_timing_sync;
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bool disable_hpd_irq;
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bool dmcub_trace_event_en;
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/**
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* @da_list:
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@ -3077,6 +3077,37 @@ static int force_timing_sync_get(void *data, u64 *val)
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DEFINE_DEBUGFS_ATTRIBUTE(force_timing_sync_ops, force_timing_sync_get,
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force_timing_sync_set, "%llu\n");
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/*
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* Disables all HPD and HPD RX interrupt handling in the
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* driver when set to 1. Default is 0.
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*/
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static int disable_hpd_set(void *data, u64 val)
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{
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struct amdgpu_device *adev = data;
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adev->dm.disable_hpd_irq = (bool)val;
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return 0;
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}
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/*
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* Returns 1 if HPD and HPRX interrupt handling is disabled,
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* 0 otherwise.
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*/
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static int disable_hpd_get(void *data, u64 *val)
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{
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struct amdgpu_device *adev = data;
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*val = adev->dm.disable_hpd_irq;
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return 0;
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}
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DEFINE_DEBUGFS_ATTRIBUTE(disable_hpd_ops, disable_hpd_get,
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disable_hpd_set, "%llu\n");
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/*
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* Sets the DC visual confirm debug option from the given string.
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* Example usage: echo 1 > /sys/kernel/debug/dri/0/amdgpu_visual_confirm
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@ -3213,4 +3244,8 @@ void dtn_debugfs_init(struct amdgpu_device *adev)
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debugfs_create_file_unsafe("amdgpu_dm_dcc_en", 0644, root, adev,
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&dcc_en_bits_fops);
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debugfs_create_file_unsafe("amdgpu_dm_disable_hpd", 0644, root, adev,
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&disable_hpd_ops);
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}
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