drm/radeon/evergreen.c

1950 static u32 evergreen_dram_bandwidth(struct evergreen_wm_params *wm)
1958 	yclk.full = dfixed_const(wm->yclk);
1960 	dram_channels.full = dfixed_const(wm->dram_channels * 4);
1970 static u32 evergreen_dram_bandwidth_for_display(struct evergreen_wm_params *wm)
1978 	yclk.full = dfixed_const(wm->yclk);
1980 	dram_channels.full = dfixed_const(wm->dram_channels * 4);
1990 static u32 evergreen_data_return_bandwidth(struct evergreen_wm_params *wm)
1998 	sclk.full = dfixed_const(wm->sclk);
2010 static u32 evergreen_dmif_request_bandwidth(struct evergreen_wm_params *wm)
2018 	disp_clk.full = dfixed_const(wm->disp_clk);
2030 static u32 evergreen_available_bandwidth(struct evergreen_wm_params *wm)
2033 	u32 dram_bandwidth = evergreen_dram_bandwidth(wm);
2034 	u32 data_return_bandwidth = evergreen_data_return_bandwidth(wm);
2035 	u32 dmif_req_bandwidth = evergreen_dmif_request_bandwidth(wm);
2040 static u32 evergreen_average_bandwidth(struct evergreen_wm_params *wm)
2053 	line_time.full = dfixed_const(wm->active_time + wm->blank_time);
2055 	bpp.full = dfixed_const(wm->bytes_per_pixel);
2056 	src_width.full = dfixed_const(wm->src_width);
2058 	bandwidth.full = dfixed_mul(bandwidth, wm->vsc);
2064 static u32 evergreen_latency_watermark(struct evergreen_wm_params *wm)
2068 	u32 available_bandwidth = evergreen_available_bandwidth(wm);
2071 	u32 dc_latency = 40000000 / wm->disp_clk; /* dc pipe latency */
2072 	u32 other_heads_data_return_time = ((wm->num_heads + 1) * worst_chunk_return_time) +
2073 		(wm->num_heads * cursor_line_pair_return_time);
2078 	if (wm->num_heads == 0)
2083 	if ((wm->vsc.full > a.full) ||
2084 	    ((wm->vsc.full > b.full) && (wm->vtaps >= 3)) ||
2085 	    (wm->vtaps >= 5) ||
2086 	    ((wm->vsc.full >= a.full) && wm->interlaced))
2092 	b.full = dfixed_const(wm->num_heads);
2095 	lb_fill_bw = min(dfixed_trunc(a), wm->disp_clk * wm->bytes_per_pixel / 1000);
2097 	a.full = dfixed_const(max_src_lines_per_dst_line * wm->src_width * wm->bytes_per_pixel);
2104 	if (line_fill_time < wm->active_time)
2107 		return latency + (line_fill_time - wm->active_time);
2111 static bool evergreen_average_bandwidth_vs_dram_bandwidth_for_display(struct evergreen_wm_params *wm)
2113 	if (evergreen_average_bandwidth(wm) <=
2114 	    (evergreen_dram_bandwidth_for_display(wm) / wm->num_heads))
2120 static bool evergreen_average_bandwidth_vs_available_bandwidth(struct evergreen_wm_params *wm)
2122 	if (evergreen_average_bandwidth(wm) <=
2123 	    (evergreen_available_bandwidth(wm) / wm->num_heads))
2129 static bool evergreen_check_latency_hiding(struct evergreen_wm_params *wm)
2131 	u32 lb_partitions = wm->lb_size / wm->src_width;
2132 	u32 line_time = wm->active_time + wm->blank_time;
2138 	if (wm->vsc.full > a.full)
2141 		if (lb_partitions <= (wm->vtaps + 1))
2147 	latency_hiding = (latency_tolerant_lines * line_time + wm->blank_time);
2149 	if (evergreen_latency_watermark(wm) <= latency_hiding)
2286 	/* select wm A */
2295 	/* select wm B */