diff options
| -rw-r--r-- | drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c | 73 |
1 files changed, 72 insertions, 1 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 f878575d17bb..e097a6059630 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 @@ -49,6 +49,10 @@ struct dmub_debugfs_trace_entry { uint32_t param1; }; +static inline const char *yesno(bool v) +{ + return v ? "yes" : "no"; +} /* parse_write_buffer_into_params - Helper function to parse debugfs write buffer into an array * @@ -980,6 +984,71 @@ static ssize_t dp_dpcd_data_read(struct file *f, char __user *buf, return read_size - r; } +/* function: Read link's DSC & FEC capabilities + * + * + * Access it with the following command (you need to specify + * connector like DP-1): + * + * cat /sys/kernel/debug/dri/0/DP-X/dp_dsc_fec_support + * + */ +static int dp_dsc_fec_support_show(struct seq_file *m, void *data) +{ + struct drm_connector *connector = m->private; + struct drm_modeset_acquire_ctx ctx; + struct drm_device *dev = connector->dev; + struct amdgpu_dm_connector *aconnector = to_amdgpu_dm_connector(connector); + int ret = 0; + bool try_again = false; + bool is_fec_supported = false; + bool is_dsc_supported = false; + struct dpcd_caps dpcd_caps; + + drm_modeset_acquire_init(&ctx, DRM_MODESET_ACQUIRE_INTERRUPTIBLE); + do { + try_again = false; + ret = drm_modeset_lock(&dev->mode_config.connection_mutex, &ctx); + if (ret) { + if (ret == -EDEADLK) { + ret = drm_modeset_backoff(&ctx); + if (!ret) { + try_again = true; + continue; + } + } + break; + } + if (connector->status != connector_status_connected) { + ret = -ENODEV; + break; + } + dpcd_caps = aconnector->dc_link->dpcd_caps; + if (aconnector->port) { + /* aconnector sets dsc_aux during get_modes call + * if MST connector has it means it can either + * enable DSC on the sink device or on MST branch + * its connected to. + */ + if (aconnector->dsc_aux) { + is_fec_supported = true; + is_dsc_supported = true; + } + } else { + is_fec_supported = dpcd_caps.fec_cap.raw & 0x1; + is_dsc_supported = dpcd_caps.dsc_caps.dsc_basic_caps.raw[0] & 0x1; + } + } while (try_again); + + drm_modeset_drop_locks(&ctx); + drm_modeset_acquire_fini(&ctx); + + seq_printf(m, "FEC_Sink_Support: %s\n", yesno(is_fec_supported)); + seq_printf(m, "DSC_Sink_Support: %s\n", yesno(is_dsc_supported)); + + return ret; +} + /* function: read DSC status on the connector * * The read function: dp_dsc_clock_en_read @@ -1838,6 +1907,7 @@ static ssize_t dp_dsc_slice_bpg_offset_read(struct file *f, char __user *buf, return result; } +DEFINE_SHOW_ATTRIBUTE(dp_dsc_fec_support); DEFINE_SHOW_ATTRIBUTE(dmub_fw_state); DEFINE_SHOW_ATTRIBUTE(dmub_tracebuffer); DEFINE_SHOW_ATTRIBUTE(output_bpc); @@ -1963,7 +2033,8 @@ static const struct { {"dsc_pic_width", &dp_dsc_pic_width_debugfs_fops}, {"dsc_pic_height", &dp_dsc_pic_height_debugfs_fops}, {"dsc_chunk_size", &dp_dsc_chunk_size_debugfs_fops}, - {"dsc_slice_bpg", &dp_dsc_slice_bpg_offset_debugfs_fops} + {"dsc_slice_bpg", &dp_dsc_slice_bpg_offset_debugfs_fops}, + {"dp_dsc_fec_support", &dp_dsc_fec_support_fops} }; #ifdef CONFIG_DRM_AMD_DC_HDCP |