percpu, x86: don't use PMD_SIZE as embedded atom_size on 32bit
[zen-stable.git] / drivers / gpu / drm / radeon / radeon_bios.c
blob501f4881e5aab4d1f1dcb9b57b4ba1a61743d9a7
1 /*
2 * Copyright 2008 Advanced Micro Devices, Inc.
3 * Copyright 2008 Red Hat Inc.
4 * Copyright 2009 Jerome Glisse.
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
22 * OTHER DEALINGS IN THE SOFTWARE.
24 * Authors: Dave Airlie
25 * Alex Deucher
26 * Jerome Glisse
28 #include "drmP.h"
29 #include "radeon_reg.h"
30 #include "radeon.h"
31 #include "atom.h"
33 #include <linux/vga_switcheroo.h>
34 #include <linux/slab.h>
36 * BIOS.
39 /* If you boot an IGP board with a discrete card as the primary,
40 * the IGP rom is not accessible via the rom bar as the IGP rom is
41 * part of the system bios. On boot, the system bios puts a
42 * copy of the igp rom at the start of vram if a discrete card is
43 * present.
45 static bool igp_read_bios_from_vram(struct radeon_device *rdev)
47 uint8_t __iomem *bios;
48 resource_size_t vram_base;
49 resource_size_t size = 256 * 1024; /* ??? */
51 if (!(rdev->flags & RADEON_IS_IGP))
52 if (!radeon_card_posted(rdev))
53 return false;
55 rdev->bios = NULL;
56 vram_base = pci_resource_start(rdev->pdev, 0);
57 bios = ioremap(vram_base, size);
58 if (!bios) {
59 return false;
62 if (size == 0 || bios[0] != 0x55 || bios[1] != 0xaa) {
63 iounmap(bios);
64 return false;
66 rdev->bios = kmalloc(size, GFP_KERNEL);
67 if (rdev->bios == NULL) {
68 iounmap(bios);
69 return false;
71 memcpy_fromio(rdev->bios, bios, size);
72 iounmap(bios);
73 return true;
76 static bool radeon_read_bios(struct radeon_device *rdev)
78 uint8_t __iomem *bios;
79 size_t size;
81 rdev->bios = NULL;
82 /* XXX: some cards may return 0 for rom size? ddx has a workaround */
83 bios = pci_map_rom(rdev->pdev, &size);
84 if (!bios) {
85 return false;
88 if (size == 0 || bios[0] != 0x55 || bios[1] != 0xaa) {
89 pci_unmap_rom(rdev->pdev, bios);
90 return false;
92 rdev->bios = kmemdup(bios, size, GFP_KERNEL);
93 if (rdev->bios == NULL) {
94 pci_unmap_rom(rdev->pdev, bios);
95 return false;
97 pci_unmap_rom(rdev->pdev, bios);
98 return true;
101 /* ATRM is used to get the BIOS on the discrete cards in
102 * dual-gpu systems.
104 static bool radeon_atrm_get_bios(struct radeon_device *rdev)
106 int ret;
107 int size = 256 * 1024;
108 int i;
110 if (!radeon_atrm_supported(rdev->pdev))
111 return false;
113 rdev->bios = kmalloc(size, GFP_KERNEL);
114 if (!rdev->bios) {
115 DRM_ERROR("Unable to allocate bios\n");
116 return false;
119 for (i = 0; i < size / ATRM_BIOS_PAGE; i++) {
120 ret = radeon_atrm_get_bios_chunk(rdev->bios,
121 (i * ATRM_BIOS_PAGE),
122 ATRM_BIOS_PAGE);
123 if (ret < ATRM_BIOS_PAGE)
124 break;
127 if (i == 0 || rdev->bios[0] != 0x55 || rdev->bios[1] != 0xaa) {
128 kfree(rdev->bios);
129 return false;
131 return true;
134 static bool ni_read_disabled_bios(struct radeon_device *rdev)
136 u32 bus_cntl;
137 u32 d1vga_control;
138 u32 d2vga_control;
139 u32 vga_render_control;
140 u32 rom_cntl;
141 bool r;
143 bus_cntl = RREG32(R600_BUS_CNTL);
144 d1vga_control = RREG32(AVIVO_D1VGA_CONTROL);
145 d2vga_control = RREG32(AVIVO_D2VGA_CONTROL);
146 vga_render_control = RREG32(AVIVO_VGA_RENDER_CONTROL);
147 rom_cntl = RREG32(R600_ROM_CNTL);
149 /* enable the rom */
150 WREG32(R600_BUS_CNTL, (bus_cntl & ~R600_BIOS_ROM_DIS));
151 /* Disable VGA mode */
152 WREG32(AVIVO_D1VGA_CONTROL,
153 (d1vga_control & ~(AVIVO_DVGA_CONTROL_MODE_ENABLE |
154 AVIVO_DVGA_CONTROL_TIMING_SELECT)));
155 WREG32(AVIVO_D2VGA_CONTROL,
156 (d2vga_control & ~(AVIVO_DVGA_CONTROL_MODE_ENABLE |
157 AVIVO_DVGA_CONTROL_TIMING_SELECT)));
158 WREG32(AVIVO_VGA_RENDER_CONTROL,
159 (vga_render_control & ~AVIVO_VGA_VSTATUS_CNTL_MASK));
160 WREG32(R600_ROM_CNTL, rom_cntl | R600_SCK_OVERWRITE);
162 r = radeon_read_bios(rdev);
164 /* restore regs */
165 WREG32(R600_BUS_CNTL, bus_cntl);
166 WREG32(AVIVO_D1VGA_CONTROL, d1vga_control);
167 WREG32(AVIVO_D2VGA_CONTROL, d2vga_control);
168 WREG32(AVIVO_VGA_RENDER_CONTROL, vga_render_control);
169 WREG32(R600_ROM_CNTL, rom_cntl);
170 return r;
173 static bool r700_read_disabled_bios(struct radeon_device *rdev)
175 uint32_t viph_control;
176 uint32_t bus_cntl;
177 uint32_t d1vga_control;
178 uint32_t d2vga_control;
179 uint32_t vga_render_control;
180 uint32_t rom_cntl;
181 uint32_t cg_spll_func_cntl = 0;
182 uint32_t cg_spll_status;
183 bool r;
185 viph_control = RREG32(RADEON_VIPH_CONTROL);
186 bus_cntl = RREG32(R600_BUS_CNTL);
187 d1vga_control = RREG32(AVIVO_D1VGA_CONTROL);
188 d2vga_control = RREG32(AVIVO_D2VGA_CONTROL);
189 vga_render_control = RREG32(AVIVO_VGA_RENDER_CONTROL);
190 rom_cntl = RREG32(R600_ROM_CNTL);
192 /* disable VIP */
193 WREG32(RADEON_VIPH_CONTROL, (viph_control & ~RADEON_VIPH_EN));
194 /* enable the rom */
195 WREG32(R600_BUS_CNTL, (bus_cntl & ~R600_BIOS_ROM_DIS));
196 /* Disable VGA mode */
197 WREG32(AVIVO_D1VGA_CONTROL,
198 (d1vga_control & ~(AVIVO_DVGA_CONTROL_MODE_ENABLE |
199 AVIVO_DVGA_CONTROL_TIMING_SELECT)));
200 WREG32(AVIVO_D2VGA_CONTROL,
201 (d2vga_control & ~(AVIVO_DVGA_CONTROL_MODE_ENABLE |
202 AVIVO_DVGA_CONTROL_TIMING_SELECT)));
203 WREG32(AVIVO_VGA_RENDER_CONTROL,
204 (vga_render_control & ~AVIVO_VGA_VSTATUS_CNTL_MASK));
206 if (rdev->family == CHIP_RV730) {
207 cg_spll_func_cntl = RREG32(R600_CG_SPLL_FUNC_CNTL);
209 /* enable bypass mode */
210 WREG32(R600_CG_SPLL_FUNC_CNTL, (cg_spll_func_cntl |
211 R600_SPLL_BYPASS_EN));
213 /* wait for SPLL_CHG_STATUS to change to 1 */
214 cg_spll_status = 0;
215 while (!(cg_spll_status & R600_SPLL_CHG_STATUS))
216 cg_spll_status = RREG32(R600_CG_SPLL_STATUS);
218 WREG32(R600_ROM_CNTL, (rom_cntl & ~R600_SCK_OVERWRITE));
219 } else
220 WREG32(R600_ROM_CNTL, (rom_cntl | R600_SCK_OVERWRITE));
222 r = radeon_read_bios(rdev);
224 /* restore regs */
225 if (rdev->family == CHIP_RV730) {
226 WREG32(R600_CG_SPLL_FUNC_CNTL, cg_spll_func_cntl);
228 /* wait for SPLL_CHG_STATUS to change to 1 */
229 cg_spll_status = 0;
230 while (!(cg_spll_status & R600_SPLL_CHG_STATUS))
231 cg_spll_status = RREG32(R600_CG_SPLL_STATUS);
233 WREG32(RADEON_VIPH_CONTROL, viph_control);
234 WREG32(R600_BUS_CNTL, bus_cntl);
235 WREG32(AVIVO_D1VGA_CONTROL, d1vga_control);
236 WREG32(AVIVO_D2VGA_CONTROL, d2vga_control);
237 WREG32(AVIVO_VGA_RENDER_CONTROL, vga_render_control);
238 WREG32(R600_ROM_CNTL, rom_cntl);
239 return r;
242 static bool r600_read_disabled_bios(struct radeon_device *rdev)
244 uint32_t viph_control;
245 uint32_t bus_cntl;
246 uint32_t d1vga_control;
247 uint32_t d2vga_control;
248 uint32_t vga_render_control;
249 uint32_t rom_cntl;
250 uint32_t general_pwrmgt;
251 uint32_t low_vid_lower_gpio_cntl;
252 uint32_t medium_vid_lower_gpio_cntl;
253 uint32_t high_vid_lower_gpio_cntl;
254 uint32_t ctxsw_vid_lower_gpio_cntl;
255 uint32_t lower_gpio_enable;
256 bool r;
258 viph_control = RREG32(RADEON_VIPH_CONTROL);
259 bus_cntl = RREG32(R600_BUS_CNTL);
260 d1vga_control = RREG32(AVIVO_D1VGA_CONTROL);
261 d2vga_control = RREG32(AVIVO_D2VGA_CONTROL);
262 vga_render_control = RREG32(AVIVO_VGA_RENDER_CONTROL);
263 rom_cntl = RREG32(R600_ROM_CNTL);
264 general_pwrmgt = RREG32(R600_GENERAL_PWRMGT);
265 low_vid_lower_gpio_cntl = RREG32(R600_LOW_VID_LOWER_GPIO_CNTL);
266 medium_vid_lower_gpio_cntl = RREG32(R600_MEDIUM_VID_LOWER_GPIO_CNTL);
267 high_vid_lower_gpio_cntl = RREG32(R600_HIGH_VID_LOWER_GPIO_CNTL);
268 ctxsw_vid_lower_gpio_cntl = RREG32(R600_CTXSW_VID_LOWER_GPIO_CNTL);
269 lower_gpio_enable = RREG32(R600_LOWER_GPIO_ENABLE);
271 /* disable VIP */
272 WREG32(RADEON_VIPH_CONTROL, (viph_control & ~RADEON_VIPH_EN));
273 /* enable the rom */
274 WREG32(R600_BUS_CNTL, (bus_cntl & ~R600_BIOS_ROM_DIS));
275 /* Disable VGA mode */
276 WREG32(AVIVO_D1VGA_CONTROL,
277 (d1vga_control & ~(AVIVO_DVGA_CONTROL_MODE_ENABLE |
278 AVIVO_DVGA_CONTROL_TIMING_SELECT)));
279 WREG32(AVIVO_D2VGA_CONTROL,
280 (d2vga_control & ~(AVIVO_DVGA_CONTROL_MODE_ENABLE |
281 AVIVO_DVGA_CONTROL_TIMING_SELECT)));
282 WREG32(AVIVO_VGA_RENDER_CONTROL,
283 (vga_render_control & ~AVIVO_VGA_VSTATUS_CNTL_MASK));
285 WREG32(R600_ROM_CNTL,
286 ((rom_cntl & ~R600_SCK_PRESCALE_CRYSTAL_CLK_MASK) |
287 (1 << R600_SCK_PRESCALE_CRYSTAL_CLK_SHIFT) |
288 R600_SCK_OVERWRITE));
290 WREG32(R600_GENERAL_PWRMGT, (general_pwrmgt & ~R600_OPEN_DRAIN_PADS));
291 WREG32(R600_LOW_VID_LOWER_GPIO_CNTL,
292 (low_vid_lower_gpio_cntl & ~0x400));
293 WREG32(R600_MEDIUM_VID_LOWER_GPIO_CNTL,
294 (medium_vid_lower_gpio_cntl & ~0x400));
295 WREG32(R600_HIGH_VID_LOWER_GPIO_CNTL,
296 (high_vid_lower_gpio_cntl & ~0x400));
297 WREG32(R600_CTXSW_VID_LOWER_GPIO_CNTL,
298 (ctxsw_vid_lower_gpio_cntl & ~0x400));
299 WREG32(R600_LOWER_GPIO_ENABLE, (lower_gpio_enable | 0x400));
301 r = radeon_read_bios(rdev);
303 /* restore regs */
304 WREG32(RADEON_VIPH_CONTROL, viph_control);
305 WREG32(R600_BUS_CNTL, bus_cntl);
306 WREG32(AVIVO_D1VGA_CONTROL, d1vga_control);
307 WREG32(AVIVO_D2VGA_CONTROL, d2vga_control);
308 WREG32(AVIVO_VGA_RENDER_CONTROL, vga_render_control);
309 WREG32(R600_ROM_CNTL, rom_cntl);
310 WREG32(R600_GENERAL_PWRMGT, general_pwrmgt);
311 WREG32(R600_LOW_VID_LOWER_GPIO_CNTL, low_vid_lower_gpio_cntl);
312 WREG32(R600_MEDIUM_VID_LOWER_GPIO_CNTL, medium_vid_lower_gpio_cntl);
313 WREG32(R600_HIGH_VID_LOWER_GPIO_CNTL, high_vid_lower_gpio_cntl);
314 WREG32(R600_CTXSW_VID_LOWER_GPIO_CNTL, ctxsw_vid_lower_gpio_cntl);
315 WREG32(R600_LOWER_GPIO_ENABLE, lower_gpio_enable);
316 return r;
319 static bool avivo_read_disabled_bios(struct radeon_device *rdev)
321 uint32_t seprom_cntl1;
322 uint32_t viph_control;
323 uint32_t bus_cntl;
324 uint32_t d1vga_control;
325 uint32_t d2vga_control;
326 uint32_t vga_render_control;
327 uint32_t gpiopad_a;
328 uint32_t gpiopad_en;
329 uint32_t gpiopad_mask;
330 bool r;
332 seprom_cntl1 = RREG32(RADEON_SEPROM_CNTL1);
333 viph_control = RREG32(RADEON_VIPH_CONTROL);
334 bus_cntl = RREG32(RV370_BUS_CNTL);
335 d1vga_control = RREG32(AVIVO_D1VGA_CONTROL);
336 d2vga_control = RREG32(AVIVO_D2VGA_CONTROL);
337 vga_render_control = RREG32(AVIVO_VGA_RENDER_CONTROL);
338 gpiopad_a = RREG32(RADEON_GPIOPAD_A);
339 gpiopad_en = RREG32(RADEON_GPIOPAD_EN);
340 gpiopad_mask = RREG32(RADEON_GPIOPAD_MASK);
342 WREG32(RADEON_SEPROM_CNTL1,
343 ((seprom_cntl1 & ~RADEON_SCK_PRESCALE_MASK) |
344 (0xc << RADEON_SCK_PRESCALE_SHIFT)));
345 WREG32(RADEON_GPIOPAD_A, 0);
346 WREG32(RADEON_GPIOPAD_EN, 0);
347 WREG32(RADEON_GPIOPAD_MASK, 0);
349 /* disable VIP */
350 WREG32(RADEON_VIPH_CONTROL, (viph_control & ~RADEON_VIPH_EN));
352 /* enable the rom */
353 WREG32(RV370_BUS_CNTL, (bus_cntl & ~RV370_BUS_BIOS_DIS_ROM));
355 /* Disable VGA mode */
356 WREG32(AVIVO_D1VGA_CONTROL,
357 (d1vga_control & ~(AVIVO_DVGA_CONTROL_MODE_ENABLE |
358 AVIVO_DVGA_CONTROL_TIMING_SELECT)));
359 WREG32(AVIVO_D2VGA_CONTROL,
360 (d2vga_control & ~(AVIVO_DVGA_CONTROL_MODE_ENABLE |
361 AVIVO_DVGA_CONTROL_TIMING_SELECT)));
362 WREG32(AVIVO_VGA_RENDER_CONTROL,
363 (vga_render_control & ~AVIVO_VGA_VSTATUS_CNTL_MASK));
365 r = radeon_read_bios(rdev);
367 /* restore regs */
368 WREG32(RADEON_SEPROM_CNTL1, seprom_cntl1);
369 WREG32(RADEON_VIPH_CONTROL, viph_control);
370 WREG32(RV370_BUS_CNTL, bus_cntl);
371 WREG32(AVIVO_D1VGA_CONTROL, d1vga_control);
372 WREG32(AVIVO_D2VGA_CONTROL, d2vga_control);
373 WREG32(AVIVO_VGA_RENDER_CONTROL, vga_render_control);
374 WREG32(RADEON_GPIOPAD_A, gpiopad_a);
375 WREG32(RADEON_GPIOPAD_EN, gpiopad_en);
376 WREG32(RADEON_GPIOPAD_MASK, gpiopad_mask);
377 return r;
380 static bool legacy_read_disabled_bios(struct radeon_device *rdev)
382 uint32_t seprom_cntl1;
383 uint32_t viph_control;
384 uint32_t bus_cntl;
385 uint32_t crtc_gen_cntl;
386 uint32_t crtc2_gen_cntl;
387 uint32_t crtc_ext_cntl;
388 uint32_t fp2_gen_cntl;
389 bool r;
391 seprom_cntl1 = RREG32(RADEON_SEPROM_CNTL1);
392 viph_control = RREG32(RADEON_VIPH_CONTROL);
393 if (rdev->flags & RADEON_IS_PCIE)
394 bus_cntl = RREG32(RV370_BUS_CNTL);
395 else
396 bus_cntl = RREG32(RADEON_BUS_CNTL);
397 crtc_gen_cntl = RREG32(RADEON_CRTC_GEN_CNTL);
398 crtc2_gen_cntl = 0;
399 crtc_ext_cntl = RREG32(RADEON_CRTC_EXT_CNTL);
400 fp2_gen_cntl = 0;
402 if (rdev->ddev->pci_device == PCI_DEVICE_ID_ATI_RADEON_QY) {
403 fp2_gen_cntl = RREG32(RADEON_FP2_GEN_CNTL);
406 if (!(rdev->flags & RADEON_SINGLE_CRTC)) {
407 crtc2_gen_cntl = RREG32(RADEON_CRTC2_GEN_CNTL);
410 WREG32(RADEON_SEPROM_CNTL1,
411 ((seprom_cntl1 & ~RADEON_SCK_PRESCALE_MASK) |
412 (0xc << RADEON_SCK_PRESCALE_SHIFT)));
414 /* disable VIP */
415 WREG32(RADEON_VIPH_CONTROL, (viph_control & ~RADEON_VIPH_EN));
417 /* enable the rom */
418 if (rdev->flags & RADEON_IS_PCIE)
419 WREG32(RV370_BUS_CNTL, (bus_cntl & ~RV370_BUS_BIOS_DIS_ROM));
420 else
421 WREG32(RADEON_BUS_CNTL, (bus_cntl & ~RADEON_BUS_BIOS_DIS_ROM));
423 /* Turn off mem requests and CRTC for both controllers */
424 WREG32(RADEON_CRTC_GEN_CNTL,
425 ((crtc_gen_cntl & ~RADEON_CRTC_EN) |
426 (RADEON_CRTC_DISP_REQ_EN_B |
427 RADEON_CRTC_EXT_DISP_EN)));
428 if (!(rdev->flags & RADEON_SINGLE_CRTC)) {
429 WREG32(RADEON_CRTC2_GEN_CNTL,
430 ((crtc2_gen_cntl & ~RADEON_CRTC2_EN) |
431 RADEON_CRTC2_DISP_REQ_EN_B));
433 /* Turn off CRTC */
434 WREG32(RADEON_CRTC_EXT_CNTL,
435 ((crtc_ext_cntl & ~RADEON_CRTC_CRT_ON) |
436 (RADEON_CRTC_SYNC_TRISTAT |
437 RADEON_CRTC_DISPLAY_DIS)));
439 if (rdev->ddev->pci_device == PCI_DEVICE_ID_ATI_RADEON_QY) {
440 WREG32(RADEON_FP2_GEN_CNTL, (fp2_gen_cntl & ~RADEON_FP2_ON));
443 r = radeon_read_bios(rdev);
445 /* restore regs */
446 WREG32(RADEON_SEPROM_CNTL1, seprom_cntl1);
447 WREG32(RADEON_VIPH_CONTROL, viph_control);
448 if (rdev->flags & RADEON_IS_PCIE)
449 WREG32(RV370_BUS_CNTL, bus_cntl);
450 else
451 WREG32(RADEON_BUS_CNTL, bus_cntl);
452 WREG32(RADEON_CRTC_GEN_CNTL, crtc_gen_cntl);
453 if (!(rdev->flags & RADEON_SINGLE_CRTC)) {
454 WREG32(RADEON_CRTC2_GEN_CNTL, crtc2_gen_cntl);
456 WREG32(RADEON_CRTC_EXT_CNTL, crtc_ext_cntl);
457 if (rdev->ddev->pci_device == PCI_DEVICE_ID_ATI_RADEON_QY) {
458 WREG32(RADEON_FP2_GEN_CNTL, fp2_gen_cntl);
460 return r;
463 static bool radeon_read_disabled_bios(struct radeon_device *rdev)
465 if (rdev->flags & RADEON_IS_IGP)
466 return igp_read_bios_from_vram(rdev);
467 else if (rdev->family >= CHIP_BARTS)
468 return ni_read_disabled_bios(rdev);
469 else if (rdev->family >= CHIP_RV770)
470 return r700_read_disabled_bios(rdev);
471 else if (rdev->family >= CHIP_R600)
472 return r600_read_disabled_bios(rdev);
473 else if (rdev->family >= CHIP_RS600)
474 return avivo_read_disabled_bios(rdev);
475 else
476 return legacy_read_disabled_bios(rdev);
480 bool radeon_get_bios(struct radeon_device *rdev)
482 bool r;
483 uint16_t tmp;
485 r = radeon_atrm_get_bios(rdev);
486 if (r == false)
487 r = igp_read_bios_from_vram(rdev);
488 if (r == false)
489 r = radeon_read_bios(rdev);
490 if (r == false) {
491 r = radeon_read_disabled_bios(rdev);
493 if (r == false || rdev->bios == NULL) {
494 DRM_ERROR("Unable to locate a BIOS ROM\n");
495 rdev->bios = NULL;
496 return false;
498 if (rdev->bios[0] != 0x55 || rdev->bios[1] != 0xaa) {
499 printk("BIOS signature incorrect %x %x\n", rdev->bios[0], rdev->bios[1]);
500 goto free_bios;
503 tmp = RBIOS16(0x18);
504 if (RBIOS8(tmp + 0x14) != 0x0) {
505 DRM_INFO("Not an x86 BIOS ROM, not using.\n");
506 goto free_bios;
509 rdev->bios_header_start = RBIOS16(0x48);
510 if (!rdev->bios_header_start) {
511 goto free_bios;
513 tmp = rdev->bios_header_start + 4;
514 if (!memcmp(rdev->bios + tmp, "ATOM", 4) ||
515 !memcmp(rdev->bios + tmp, "MOTA", 4)) {
516 rdev->is_atom_bios = true;
517 } else {
518 rdev->is_atom_bios = false;
521 DRM_DEBUG("%sBIOS detected\n", rdev->is_atom_bios ? "ATOM" : "COM");
522 return true;
523 free_bios:
524 kfree(rdev->bios);
525 rdev->bios = NULL;
526 return false;