Commit 37bedd99 authored by Aurabindo Pillai's avatar Aurabindo Pillai Committed by Alex Deucher
Browse files

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: default avatarAurabindo Pillai <aurabindo.pillai@amd.com>
Reviewed-by: default avatarRodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Acked-by: default avatarQingqing Zhuo <qingqing.zhuo@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 9df857f9

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c

+66 −0
Original line number Diff line number Diff line
@@ -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},