diff options
| author |   Aurabindo Pillai <aurabindo.pillai@amd.com> | 2021-03-23 17:51:56 -0400 |
|---|---|---|
| committer |   Alex Deucher <alexander.deucher@amd.com> | 2021-04-09 16:51:48 -0400 |
| commit | 37bedd9929b925b25a4b5397d7f32d3600067688 (patch) | |
| tree | cd1b40db2647f55cdd1492d2f9289535f3fd47e7 /drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c | |
| parent | drm/amd/display: Move vupdate keepout programming from DCN20 to DCN10 (diff) | |
| download | wireguard-linux-37bedd9929b925b25a4b5397d7f32d3600067688.tar.xz wireguard-linux-37bedd9929b925b25a4b5397d7f32d3600067688.zip | |
drm/amd/display: Add debugfs entry for LTTPR register status
[Why]
Functionality of LTTPR is reporter through the DPCD register
[How]
Expose a interface in debugfs to read the current status of
LTTPR as reported from the device's DPCD register
Signed-off-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Reviewed-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Acked-by: Qingqing Zhuo <qingqing.zhuo@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c')
| -rw-r--r-- | drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c | 66 |
1 files changed, 66 insertions, 0 deletions
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 5a9809e33af8..32f05aefda17 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 @@ -400,6 +400,70 @@ static ssize_t dp_phy_settings_read(struct file *f, char __user *buf, return result; } +static int dp_lttpr_status_show(struct seq_file *m, void *d) +{ + char *data; + struct amdgpu_dm_connector *connector = file_inode(m->file)->i_private; + struct dc_link *link = connector->dc_link; + uint32_t read_size = 1; + uint8_t repeater_count = 0; + + data = kzalloc(read_size, GFP_KERNEL); + if (!data) + return 0; + + dm_helpers_dp_read_dpcd(link->ctx, link, 0xF0002, data, read_size); + + switch ((uint8_t)*data) { + case 0x80: + repeater_count = 1; + break; + case 0x40: + repeater_count = 2; + break; + case 0x20: + repeater_count = 3; + break; + case 0x10: + repeater_count = 4; + break; + case 0x8: + repeater_count = 5; + break; + case 0x4: + repeater_count = 6; + break; + case 0x2: + repeater_count = 7; + break; + case 0x1: + repeater_count = 8; + break; + case 0x0: + repeater_count = 0; + break; + default: + repeater_count = (uint8_t)*data; + break; + } + + seq_printf(m, "phy repeater count: %d\n", repeater_count); + + dm_helpers_dp_read_dpcd(link->ctx, link, 0xF0003, data, read_size); + + if ((uint8_t)*data == 0x55) + seq_printf(m, "phy repeater mode: transparent\n"); + else if ((uint8_t)*data == 0xAA) + seq_printf(m, "phy repeater mode: non-transparent\n"); + else if ((uint8_t)*data == 0x00) + seq_printf(m, "phy repeater mode: non lttpr\n"); + else + seq_printf(m, "phy repeater mode: read error\n"); + + kfree(data); + return 0; +} + static ssize_t dp_phy_settings_write(struct file *f, const char __user *buf, size_t size, loff_t *pos) { @@ -2301,6 +2365,7 @@ DEFINE_SHOW_ATTRIBUTE(dp_dsc_fec_support); DEFINE_SHOW_ATTRIBUTE(dmub_fw_state); DEFINE_SHOW_ATTRIBUTE(dmub_tracebuffer); DEFINE_SHOW_ATTRIBUTE(output_bpc); +DEFINE_SHOW_ATTRIBUTE(dp_lttpr_status); #ifdef CONFIG_DRM_AMD_DC_HDCP DEFINE_SHOW_ATTRIBUTE(hdcp_sink_capability); #endif @@ -2421,6 +2486,7 @@ static const struct { } dp_debugfs_entries[] = { {"link_settings", &dp_link_settings_debugfs_fops}, {"phy_settings", &dp_phy_settings_debugfs_fop}, + {"lttpr_status", &dp_lttpr_status_fops}, {"test_pattern", &dp_phy_test_pattern_fops}, #ifdef CONFIG_DRM_AMD_DC_HDCP {"hdcp_sink_capability", &hdcp_sink_capability_fops}, |