2 * Copyright 1993-2003 NVIDIA, Corporation
3 * Copyright 2007-2009 Stuart Bennett
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
19 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
20 * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
25 #include "nouveau_drm.h"
26 #include "nouveau_reg.h"
27 #include "nouveau_hw.h"
29 /****************************************************************************\
31 * The video arbitration routines calculate some "magic" numbers. Fixes *
32 * the snow seen when accessing the framebuffer without it. *
33 * It just works (I hope). *
35 \****************************************************************************/
55 nv04_calc_arb(struct nv_fifo_info *fifo, struct nv_sim_state *arb)
57 int pagemiss, cas, width, bpp;
58 int nvclks, mclks, pclks, crtpagemiss;
59 int found, mclk_extra, mclk_loop, cbs, m1, p1;
60 int mclk_freq, pclk_freq, nvclk_freq;
61 int us_m, us_n, us_p, crtc_drain_rate;
62 int cpm_us, us_crt, clwm;
64 pclk_freq = arb->pclk_khz;
65 mclk_freq = arb->mclk_khz;
66 nvclk_freq = arb->nvclk_khz;
67 pagemiss = arb->mem_page_miss;
68 cas = arb->mem_latency;
69 width = arb->memory_width >> 6;
82 mclk_loop = mclks + mclk_extra;
83 us_m = mclk_loop * 1000 * 1000 / mclk_freq;
84 us_n = nvclks * 1000 * 1000 / nvclk_freq;
85 us_p = nvclks * 1000 * 1000 / pclk_freq;
87 crtc_drain_rate = pclk_freq * bpp / 8;
90 cpm_us = crtpagemiss * pagemiss * 1000 * 1000 / mclk_freq;
91 us_crt = cpm_us + us_m + us_n + us_p;
92 clwm = us_crt * crtc_drain_rate / (1000 * 1000);
95 m1 = clwm + cbs - 512;
96 p1 = m1 * pclk_freq / mclk_freq;
98 if ((p1 < m1 && m1 > 0) || clwm > 519) {
111 nv10_calc_arb(struct nv_fifo_info *fifo, struct nv_sim_state *arb)
113 int fill_rate, drain_rate;
114 int pclks, nvclks, mclks, xclks;
115 int pclk_freq, nvclk_freq, mclk_freq;
116 int fill_lat, extra_lat;
117 int max_burst_o, max_burst_l;
118 int fifo_len, min_lwm, max_lwm;
119 const int burst_lat = 80; /* Maximum allowable latency due
120 * to the CRTC FIFO burst. (ns) */
122 pclk_freq = arb->pclk_khz;
123 nvclk_freq = arb->nvclk_khz;
124 mclk_freq = arb->mclk_khz;
126 fill_rate = mclk_freq * arb->memory_width / 8; /* kB/s */
127 drain_rate = pclk_freq * arb->bpp / 8; /* kB/s */
129 fifo_len = arb->two_heads ? 1536 : 1024; /* B */
131 /* Fixed FIFO refill latency. */
133 pclks = 4; /* lwm detect. */
135 nvclks = 3 /* lwm -> sync. */
136 + 2 /* fbi bus cycles (1 req + 1 busy) */
137 + 1 /* 2 edge sync. may be very close to edge so
139 + 1 /* fbi_d_rdv_n */
140 + 1 /* Fbi_d_rdata */
141 + 1; /* crtfifo load */
143 mclks = 1 /* 2 edge sync. may be very close to edge so
146 + 5 /* tiling pipeline */
147 + 2 /* latency fifo */
148 + 2 /* memory request to fbio block */
149 + 7; /* data returned from fbio block */
151 /* Need to accumulate 256 bits for read */
152 mclks += (arb->memory_type == 0 ? 2 : 1)
153 * arb->memory_width / 32;
155 fill_lat = mclks * 1000 * 1000 / mclk_freq /* minimum mclk latency */
156 + nvclks * 1000 * 1000 / nvclk_freq /* nvclk latency */
157 + pclks * 1000 * 1000 / pclk_freq; /* pclk latency */
159 /* Conditional FIFO refill latency. */
161 xclks = 2 * arb->mem_page_miss + mclks /* Extra latency due to
163 + 2 * arb->mem_page_miss /* Extra pagemiss latency. */
164 + (arb->bpp == 32 ? 8 : 4); /* Margin of error. */
166 extra_lat = xclks * 1000 * 1000 / mclk_freq;
169 /* Account for another CRTC. */
170 extra_lat += fill_lat + extra_lat + burst_lat;
174 /* Max burst not leading to overflows. */
175 max_burst_o = (1 + fifo_len - extra_lat * drain_rate / (1000 * 1000))
176 * (fill_rate / 1000) / ((fill_rate - drain_rate) / 1000);
177 fifo->burst = min(max_burst_o, 1024);
179 /* Max burst value with an acceptable latency. */
180 max_burst_l = burst_lat * fill_rate / (1000 * 1000);
181 fifo->burst = min(max_burst_l, fifo->burst);
183 fifo->burst = rounddown_pow_of_two(fifo->burst);
185 /* FIFO low watermark */
187 min_lwm = (fill_lat + extra_lat) * drain_rate / (1000 * 1000) + 1;
188 max_lwm = fifo_len - fifo->burst
189 + fill_lat * drain_rate / (1000 * 1000)
190 + fifo->burst * drain_rate / fill_rate;
192 fifo->lwm = min_lwm + 10 * (max_lwm - min_lwm) / 100; /* Empirical. */
196 nv04_update_arb(struct drm_device *dev, int VClk, int bpp,
197 int *burst, int *lwm)
199 struct nouveau_drm *drm = nouveau_drm(dev);
200 struct nouveau_device *device = nouveau_dev(dev);
201 struct nv_fifo_info fifo_data;
202 struct nv_sim_state sim_data;
203 int MClk = nouveau_hw_get_clock(dev, PLL_MEMORY);
204 int NVClk = nouveau_hw_get_clock(dev, PLL_CORE);
205 uint32_t cfg1 = nv_rd32(device, NV04_PFB_CFG1);
207 sim_data.pclk_khz = VClk;
208 sim_data.mclk_khz = MClk;
209 sim_data.nvclk_khz = NVClk;
211 sim_data.two_heads = nv_two_heads(dev);
212 if ((dev->pci_device & 0xffff) == 0x01a0 /*CHIPSET_NFORCE*/ ||
213 (dev->pci_device & 0xffff) == 0x01f0 /*CHIPSET_NFORCE2*/) {
216 pci_read_config_dword(pci_get_bus_and_slot(0, 1), 0x7c, &type);
218 sim_data.memory_type = (type >> 12) & 1;
219 sim_data.memory_width = 64;
220 sim_data.mem_latency = 3;
221 sim_data.mem_page_miss = 10;
223 sim_data.memory_type = nv_rd32(device, NV04_PFB_CFG0) & 0x1;
224 sim_data.memory_width = (nv_rd32(device, NV_PEXTDEV_BOOT_0) & 0x10) ? 128 : 64;
225 sim_data.mem_latency = cfg1 & 0xf;
226 sim_data.mem_page_miss = ((cfg1 >> 4) & 0xf) + ((cfg1 >> 31) & 0x1);
229 if (nv_device(drm->device)->card_type == NV_04)
230 nv04_calc_arb(&fifo_data, &sim_data);
232 nv10_calc_arb(&fifo_data, &sim_data);
234 *burst = ilog2(fifo_data.burst >> 4);
235 *lwm = fifo_data.lwm >> 3;
239 nv20_update_arb(int *burst, int *lwm)
241 unsigned int fifo_size, burst_size, graphics_lwm;
245 graphics_lwm = fifo_size - burst_size;
247 *burst = ilog2(burst_size >> 5);
248 *lwm = graphics_lwm >> 3;
252 nouveau_calc_arb(struct drm_device *dev, int vclk, int bpp, int *burst, int *lwm)
254 struct nouveau_drm *drm = nouveau_drm(dev);
256 if (nv_device(drm->device)->card_type < NV_20)
257 nv04_update_arb(dev, vclk, bpp, burst, lwm);
258 else if ((dev->pci_device & 0xfff0) == 0x0240 /*CHIPSET_C51*/ ||
259 (dev->pci_device & 0xfff0) == 0x03d0 /*CHIPSET_C512*/) {
263 nv20_update_arb(burst, lwm);