From 7e4aeed859d47474e40f43ef6ef3004ab52486be Mon Sep 17 00:00:00 2001 From: Fangzhi Zuo Date: Tue, 7 Dec 2021 13:47:51 -0500 Subject: drm/amd/display: Add Debugfs Entry to Force in SST Sequence It is to force SST sequence on MST capable receivers. v2: squash in compilation fix when CONFIG_DRM_AMD_DC_DCN is not set Signed-off-by: Fangzhi Zuo Reviewed-by: Aurabindo Pillai Signed-off-by: Alex Deucher --- .../drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c | 30 ++++++++++++++++++++++ 1 file changed, 30 insertions(+) (limited to 'drivers') 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 31c05eb5c64a..dc55a736e198 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 @@ -3237,6 +3237,32 @@ static int disable_hpd_get(void *data, u64 *val) DEFINE_DEBUGFS_ATTRIBUTE(disable_hpd_ops, disable_hpd_get, disable_hpd_set, "%llu\n"); +#if defined(CONFIG_DRM_AMD_DC_DCN) +/* + * Temporary w/a to force sst sequence in M42D DP2 mst receiver + * Example usage: echo 1 > /sys/kernel/debug/dri/0/amdgpu_dm_dp_set_mst_en_for_sst + */ +static int dp_force_sst_set(void *data, u64 val) +{ + struct amdgpu_device *adev = data; + + adev->dm.dc->debug.set_mst_en_for_sst = val; + + return 0; +} + +static int dp_force_sst_get(void *data, u64 *val) +{ + struct amdgpu_device *adev = data; + + *val = adev->dm.dc->debug.set_mst_en_for_sst; + + return 0; +} +DEFINE_DEBUGFS_ATTRIBUTE(dp_set_mst_en_for_sst_ops, dp_force_sst_get, + dp_force_sst_set, "%llu\n"); +#endif + /* * Sets the DC visual confirm debug option from the given string. * Example usage: echo 1 > /sys/kernel/debug/dri/0/amdgpu_visual_confirm @@ -3346,6 +3372,10 @@ void dtn_debugfs_init(struct amdgpu_device *adev) adev, &mst_topo_fops); debugfs_create_file("amdgpu_dm_dtn_log", 0644, root, adev, &dtn_log_fops); +#if defined(CONFIG_DRM_AMD_DC_DCN) + debugfs_create_file("amdgpu_dm_dp_set_mst_en_for_sst", 0644, root, adev, + &dp_set_mst_en_for_sst_ops); +#endif debugfs_create_file_unsafe("amdgpu_dm_visual_confirm", 0644, root, adev, &visual_confirm_fops); -- cgit v1.2.3