Example #1
0
static int radeon_dp_get_dp_link_clock(struct drm_connector *connector,
				       u8 dpcd[DP_DPCD_SIZE],
				       int pix_clock)
{
	int bpp = convert_bpc_to_bpp(radeon_get_monitor_bpc(connector));
	int lane_num, max_pix_clock;

	if (radeon_connector_encoder_get_dp_bridge_encoder_id(connector) ==
	    ENCODER_OBJECT_ID_NUTMEG)
		return 270000;

	lane_num = radeon_dp_get_dp_lane_number(connector, dpcd, pix_clock);
	max_pix_clock = dp_get_max_dp_pix_clock(162000, lane_num, bpp);
	if (pix_clock <= max_pix_clock)
		return 162000;
	max_pix_clock = dp_get_max_dp_pix_clock(270000, lane_num, bpp);
	if (pix_clock <= max_pix_clock)
		return 270000;
	if (radeon_connector_is_dp12_capable(connector)) {
		max_pix_clock = dp_get_max_dp_pix_clock(540000, lane_num, bpp);
		if (pix_clock <= max_pix_clock)
			return 540000;
	}

	return drm_dp_max_link_rate(dpcd);
}
Example #2
0
static int radeon_dp_get_dp_link_clock(struct drm_connector *connector,
				       u8 dpcd[DP_DPCD_SIZE],
				       int pix_clock)
{
	int bpp = convert_bpc_to_bpp(connector->display_info.bpc);
	int lane_num, max_pix_clock;

	if (radeon_connector_encoder_is_dp_bridge(connector))
		return 270000;

	lane_num = radeon_dp_get_dp_lane_number(connector, dpcd, pix_clock);
	max_pix_clock = dp_get_max_dp_pix_clock(162000, lane_num, bpp);
	if (pix_clock <= max_pix_clock)
		return 162000;
	max_pix_clock = dp_get_max_dp_pix_clock(270000, lane_num, bpp);
	if (pix_clock <= max_pix_clock)
		return 270000;
	if (radeon_connector_is_dp12_capable(connector)) {
		max_pix_clock = dp_get_max_dp_pix_clock(540000, lane_num, bpp);
		if (pix_clock <= max_pix_clock)
			return 540000;
	}

	return dp_get_max_link_rate(dpcd);
}
Example #3
0
/* First get the min lane# when low rate is used according to pixel clock
 * (prefer low rate), second check max lane# supported by DP panel,
 * if the max lane# < low rate lane# then use max lane# instead.
 */
static int radeon_dp_get_dp_lane_number(struct drm_connector *connector,
					u8 dpcd[DP_DPCD_SIZE],
					int pix_clock)
{
	int bpp = convert_bpc_to_bpp(radeon_get_monitor_bpc(connector));
	int max_link_rate = drm_dp_max_link_rate(dpcd);
	int max_lane_num = drm_dp_max_lane_count(dpcd);
	int lane_num;
	int max_dp_pix_clock;

	for (lane_num = 1; lane_num < max_lane_num; lane_num <<= 1) {
		max_dp_pix_clock = dp_get_max_dp_pix_clock(max_link_rate, lane_num, bpp);
		if (pix_clock <= max_dp_pix_clock)
			break;
	}

	return lane_num;
}