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drm/amd/display: add HDCP caps debugfs

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Add debugfs to get HDCP capability. This is also useful for
kms_content_protection igt test.

Use:
	cat /sys/kernel/debug/dri/0/DP-1/hdcp_sink_capability
	cat /sys/kernel/debug/dri/0/HDMI-A-1/hdcp_sink_capability

Signed-off-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Reviewed-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Bhawanpreet Lakha 2020-02-24 14:55:53 -05:00 committed by Alex Deucher
parent fe8db3bcf2
commit 5f8693796c
3 changed files with 112 additions and 0 deletions
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61
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
View File

@ -838,6 +838,44 @@ static int vrr_range_show(struct seq_file *m, void *data)
return 0;
}
#ifdef CONFIG_DRM_AMD_DC_HDCP
/*
* Returns the HDCP capability of the Display (1.4 for now).
*
* NOTE* Not all HDMI displays report their HDCP caps even when they are capable.
* Since its rare for a display to not be HDCP 1.4 capable, we set HDMI as always capable.
*
* Example usage: cat /sys/kernel/debug/dri/0/DP-1/hdcp_sink_capability
* or cat /sys/kernel/debug/dri/0/HDMI-A-1/hdcp_sink_capability
*/
static int hdcp_sink_capability_show(struct seq_file *m, void *data)
{
struct drm_connector *connector = m->private;
struct amdgpu_dm_connector *aconnector = to_amdgpu_dm_connector(connector);
bool hdcp_cap, hdcp2_cap;
if (connector->status != connector_status_connected)
return -ENODEV;
seq_printf(m, "%s:%d HDCP version: ", connector->name, connector->base.id);
hdcp_cap = dc_link_is_hdcp14(aconnector->dc_link);
hdcp2_cap = dc_link_is_hdcp22(aconnector->dc_link);
if (hdcp_cap)
seq_printf(m, "%s ", "HDCP1.4");
if (hdcp2_cap)
seq_printf(m, "%s ", "HDCP2.2");
if (!hdcp_cap && !hdcp2_cap)
seq_printf(m, "%s ", "None");
seq_puts(m, "\n");
return 0;
}
#endif
/* function description
*
* generic SDP message access for testing
@ -964,6 +1002,9 @@ DEFINE_SHOW_ATTRIBUTE(dmub_fw_state);
DEFINE_SHOW_ATTRIBUTE(dmub_tracebuffer);
DEFINE_SHOW_ATTRIBUTE(output_bpc);
DEFINE_SHOW_ATTRIBUTE(vrr_range);
#ifdef CONFIG_DRM_AMD_DC_HDCP
DEFINE_SHOW_ATTRIBUTE(hdcp_sink_capability);
#endif
static const struct file_operations dp_link_settings_debugfs_fops = {
.owner = THIS_MODULE,
@ -1019,12 +1060,23 @@ static const struct {
{"test_pattern", &dp_phy_test_pattern_fops},
{"output_bpc", &output_bpc_fops},
{"vrr_range", &vrr_range_fops},
#ifdef CONFIG_DRM_AMD_DC_HDCP
{"hdcp_sink_capability", &hdcp_sink_capability_fops},
#endif
{"sdp_message", &sdp_message_fops},
{"aux_dpcd_address", &dp_dpcd_address_debugfs_fops},
{"aux_dpcd_size", &dp_dpcd_size_debugfs_fops},
{"aux_dpcd_data", &dp_dpcd_data_debugfs_fops}
};
#ifdef CONFIG_DRM_AMD_DC_HDCP
static const struct {
char *name;
const struct file_operations *fops;
} hdmi_debugfs_entries[] = {
{"hdcp_sink_capability", &hdcp_sink_capability_fops}
};
#endif
/*
* Force YUV420 output if available from the given mode
*/
@ -1093,6 +1145,15 @@ void connector_debugfs_init(struct amdgpu_dm_connector *connector)
connector->debugfs_dpcd_address = 0;
connector->debugfs_dpcd_size = 0;
#ifdef CONFIG_DRM_AMD_DC_HDCP
if (connector->base.connector_type == DRM_MODE_CONNECTOR_HDMIA) {
for (i = 0; i < ARRAY_SIZE(hdmi_debugfs_entries); i++) {
debugfs_create_file(hdmi_debugfs_entries[i].name,
0644, dir, connector,
hdmi_debugfs_entries[i].fops);
}
}
#endif
}
/*

47
drivers/gpu/drm/amd/display/dc/core/dc_link.c
View File

@ -516,6 +516,53 @@ static void link_disconnect_remap(struct dc_sink *prev_sink, struct dc_link *lin
}
#if defined(CONFIG_DRM_AMD_DC_HDCP)
bool dc_link_is_hdcp14(struct dc_link *link)
{
bool ret = false;
switch (link->connector_signal) {
case SIGNAL_TYPE_DISPLAY_PORT:
case SIGNAL_TYPE_DISPLAY_PORT_MST:
ret = link->hdcp_caps.bcaps.bits.HDCP_CAPABLE;
break;
case SIGNAL_TYPE_DVI_SINGLE_LINK:
case SIGNAL_TYPE_DVI_DUAL_LINK:
case SIGNAL_TYPE_HDMI_TYPE_A:
/* HDMI doesn't tell us its HDCP(1.4) capability, so assume to always be capable,
* we can poll for bksv but some displays have an issue with this. Since its so rare
* for a display to not be 1.4 capable, this assumtion is ok
*/
ret = true;
break;
default:
break;
}
return ret;
}
bool dc_link_is_hdcp22(struct dc_link *link)
{
bool ret = false;
switch (link->connector_signal) {
case SIGNAL_TYPE_DISPLAY_PORT:
case SIGNAL_TYPE_DISPLAY_PORT_MST:
ret = (link->hdcp_caps.bcaps.bits.HDCP_CAPABLE &&
link->hdcp_caps.rx_caps.fields.byte0.hdcp_capable &&
(link->hdcp_caps.rx_caps.fields.version == 0x2)) ? 1 : 0;
break;
case SIGNAL_TYPE_DVI_SINGLE_LINK:
case SIGNAL_TYPE_DVI_DUAL_LINK:
case SIGNAL_TYPE_HDMI_TYPE_A:
ret = (link->hdcp_caps.rx_caps.fields.version == 0x4) ? 1:0;
break;
default:
break;
}
return ret;
}
static void query_hdcp_capability(enum signal_type signal, struct dc_link *link)
{
struct hdcp_protection_message msg22;

4
drivers/gpu/drm/amd/display/dc/dc_link.h
View File

@ -293,6 +293,10 @@ bool dc_link_detect_sink(struct dc_link *link, enum dc_connection_type *type);
* DPCD access interfaces
*/
#ifdef CONFIG_DRM_AMD_DC_HDCP
bool dc_link_is_hdcp14(struct dc_link *link);
bool dc_link_is_hdcp22(struct dc_link *link);
#endif
void dc_link_set_drive_settings(struct dc *dc,
struct link_training_settings *lt_settings,
const struct dc_link *link);