xref: /openbmc/linux/arch/x86/pci/fixup.c (revision 6fcd6fea)
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Exceptions for specific devices. Usually work-arounds for fatal design flaws.
4  */
5 
6 #include <linux/bitfield.h>
7 #include <linux/delay.h>
8 #include <linux/dmi.h>
9 #include <linux/pci.h>
10 #include <linux/suspend.h>
11 #include <linux/vgaarb.h>
12 #include <asm/amd_nb.h>
13 #include <asm/hpet.h>
14 #include <asm/pci_x86.h>
15 
16 static void pci_fixup_i450nx(struct pci_dev *d)
17 {
18 	/*
19 	 * i450NX -- Find and scan all secondary buses on all PXB's.
20 	 */
21 	int pxb, reg;
22 	u8 busno, suba, subb;
23 
24 	dev_warn(&d->dev, "Searching for i450NX host bridges\n");
25 	reg = 0xd0;
26 	for(pxb = 0; pxb < 2; pxb++) {
27 		pci_read_config_byte(d, reg++, &busno);
28 		pci_read_config_byte(d, reg++, &suba);
29 		pci_read_config_byte(d, reg++, &subb);
30 		dev_dbg(&d->dev, "i450NX PXB %d: %02x/%02x/%02x\n", pxb, busno,
31 			suba, subb);
32 		if (busno)
33 			pcibios_scan_root(busno);	/* Bus A */
34 		if (suba < subb)
35 			pcibios_scan_root(suba+1);	/* Bus B */
36 	}
37 	pcibios_last_bus = -1;
38 }
39 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82451NX, pci_fixup_i450nx);
40 
41 static void pci_fixup_i450gx(struct pci_dev *d)
42 {
43 	/*
44 	 * i450GX and i450KX -- Find and scan all secondary buses.
45 	 * (called separately for each PCI bridge found)
46 	 */
47 	u8 busno;
48 	pci_read_config_byte(d, 0x4a, &busno);
49 	dev_info(&d->dev, "i440KX/GX host bridge; secondary bus %02x\n", busno);
50 	pcibios_scan_root(busno);
51 	pcibios_last_bus = -1;
52 }
53 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82454GX, pci_fixup_i450gx);
54 
55 static void pci_fixup_umc_ide(struct pci_dev *d)
56 {
57 	/*
58 	 * UM8886BF IDE controller sets region type bits incorrectly,
59 	 * therefore they look like memory despite of them being I/O.
60 	 */
61 	int i;
62 
63 	dev_warn(&d->dev, "Fixing base address flags\n");
64 	for(i = 0; i < 4; i++)
65 		d->resource[i].flags |= PCI_BASE_ADDRESS_SPACE_IO;
66 }
67 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_UMC, PCI_DEVICE_ID_UMC_UM8886BF, pci_fixup_umc_ide);
68 
69 static void pci_fixup_latency(struct pci_dev *d)
70 {
71 	/*
72 	 *  SiS 5597 and 5598 chipsets require latency timer set to
73 	 *  at most 32 to avoid lockups.
74 	 */
75 	dev_dbg(&d->dev, "Setting max latency to 32\n");
76 	pcibios_max_latency = 32;
77 }
78 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_5597, pci_fixup_latency);
79 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_5598, pci_fixup_latency);
80 
81 static void pci_fixup_piix4_acpi(struct pci_dev *d)
82 {
83 	/*
84 	 * PIIX4 ACPI device: hardwired IRQ9
85 	 */
86 	d->irq = 9;
87 }
88 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371AB_3, pci_fixup_piix4_acpi);
89 
90 /*
91  * Addresses issues with problems in the memory write queue timer in
92  * certain VIA Northbridges.  This bugfix is per VIA's specifications,
93  * except for the KL133/KM133: clearing bit 5 on those Northbridges seems
94  * to trigger a bug in its integrated ProSavage video card, which
95  * causes screen corruption.  We only clear bits 6 and 7 for that chipset,
96  * until VIA can provide us with definitive information on why screen
97  * corruption occurs, and what exactly those bits do.
98  *
99  * VIA 8363,8622,8361 Northbridges:
100  *  - bits  5, 6, 7 at offset 0x55 need to be turned off
101  * VIA 8367 (KT266x) Northbridges:
102  *  - bits  5, 6, 7 at offset 0x95 need to be turned off
103  * VIA 8363 rev 0x81/0x84 (KL133/KM133) Northbridges:
104  *  - bits     6, 7 at offset 0x55 need to be turned off
105  */
106 
107 #define VIA_8363_KL133_REVISION_ID 0x81
108 #define VIA_8363_KM133_REVISION_ID 0x84
109 
110 static void pci_fixup_via_northbridge_bug(struct pci_dev *d)
111 {
112 	u8 v;
113 	int where = 0x55;
114 	int mask = 0x1f; /* clear bits 5, 6, 7 by default */
115 
116 	if (d->device == PCI_DEVICE_ID_VIA_8367_0) {
117 		/* fix pci bus latency issues resulted by NB bios error
118 		   it appears on bug free^Wreduced kt266x's bios forces
119 		   NB latency to zero */
120 		pci_write_config_byte(d, PCI_LATENCY_TIMER, 0);
121 
122 		where = 0x95; /* the memory write queue timer register is
123 				different for the KT266x's: 0x95 not 0x55 */
124 	} else if (d->device == PCI_DEVICE_ID_VIA_8363_0 &&
125 			(d->revision == VIA_8363_KL133_REVISION_ID ||
126 			d->revision == VIA_8363_KM133_REVISION_ID)) {
127 			mask = 0x3f; /* clear only bits 6 and 7; clearing bit 5
128 					causes screen corruption on the KL133/KM133 */
129 	}
130 
131 	pci_read_config_byte(d, where, &v);
132 	if (v & ~mask) {
133 		dev_warn(&d->dev, "Disabling VIA memory write queue (PCI ID %04x, rev %02x): [%02x] %02x & %02x -> %02x\n", \
134 			d->device, d->revision, where, v, mask, v & mask);
135 		v &= mask;
136 		pci_write_config_byte(d, where, v);
137 	}
138 }
139 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8363_0, pci_fixup_via_northbridge_bug);
140 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8622, pci_fixup_via_northbridge_bug);
141 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8361, pci_fixup_via_northbridge_bug);
142 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8367_0, pci_fixup_via_northbridge_bug);
143 DECLARE_PCI_FIXUP_RESUME(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8363_0, pci_fixup_via_northbridge_bug);
144 DECLARE_PCI_FIXUP_RESUME(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8622, pci_fixup_via_northbridge_bug);
145 DECLARE_PCI_FIXUP_RESUME(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8361, pci_fixup_via_northbridge_bug);
146 DECLARE_PCI_FIXUP_RESUME(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8367_0, pci_fixup_via_northbridge_bug);
147 
148 /*
149  * For some reasons Intel decided that certain parts of their
150  * 815, 845 and some other chipsets must look like PCI-to-PCI bridges
151  * while they are obviously not. The 82801 family (AA, AB, BAM/CAM,
152  * BA/CA/DB and E) PCI bridges are actually HUB-to-PCI ones, according
153  * to Intel terminology. These devices do forward all addresses from
154  * system to PCI bus no matter what are their window settings, so they are
155  * "transparent" (or subtractive decoding) from programmers point of view.
156  */
157 static void pci_fixup_transparent_bridge(struct pci_dev *dev)
158 {
159 	if ((dev->device & 0xff00) == 0x2400)
160 		dev->transparent = 1;
161 }
162 DECLARE_PCI_FIXUP_CLASS_HEADER(PCI_VENDOR_ID_INTEL, PCI_ANY_ID,
163 			 PCI_CLASS_BRIDGE_PCI, 8, pci_fixup_transparent_bridge);
164 
165 /*
166  * Fixup for C1 Halt Disconnect problem on nForce2 systems.
167  *
168  * From information provided by "Allen Martin" <AMartin@nvidia.com>:
169  *
170  * A hang is caused when the CPU generates a very fast CONNECT/HALT cycle
171  * sequence.  Workaround is to set the SYSTEM_IDLE_TIMEOUT to 80 ns.
172  * This allows the state-machine and timer to return to a proper state within
173  * 80 ns of the CONNECT and probe appearing together.  Since the CPU will not
174  * issue another HALT within 80 ns of the initial HALT, the failure condition
175  * is avoided.
176  */
177 static void pci_fixup_nforce2(struct pci_dev *dev)
178 {
179 	u32 val;
180 
181 	/*
182 	 * Chip  Old value   New value
183 	 * C17   0x1F0FFF01  0x1F01FF01
184 	 * C18D  0x9F0FFF01  0x9F01FF01
185 	 *
186 	 * Northbridge chip version may be determined by
187 	 * reading the PCI revision ID (0xC1 or greater is C18D).
188 	 */
189 	pci_read_config_dword(dev, 0x6c, &val);
190 
191 	/*
192 	 * Apply fixup if needed, but don't touch disconnect state
193 	 */
194 	if ((val & 0x00FF0000) != 0x00010000) {
195 		dev_warn(&dev->dev, "nForce2 C1 Halt Disconnect fixup\n");
196 		pci_write_config_dword(dev, 0x6c, (val & 0xFF00FFFF) | 0x00010000);
197 	}
198 }
199 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE2, pci_fixup_nforce2);
200 DECLARE_PCI_FIXUP_RESUME(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE2, pci_fixup_nforce2);
201 
202 /* Max PCI Express root ports */
203 #define MAX_PCIEROOT	6
204 static int quirk_aspm_offset[MAX_PCIEROOT << 3];
205 
206 #define GET_INDEX(a, b) ((((a) - PCI_DEVICE_ID_INTEL_MCH_PA) << 3) + ((b) & 7))
207 
208 static int quirk_pcie_aspm_read(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *value)
209 {
210 	return raw_pci_read(pci_domain_nr(bus), bus->number,
211 						devfn, where, size, value);
212 }
213 
214 /*
215  * Replace the original pci bus ops for write with a new one that will filter
216  * the request to insure ASPM cannot be enabled.
217  */
218 static int quirk_pcie_aspm_write(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 value)
219 {
220 	u8 offset;
221 
222 	offset = quirk_aspm_offset[GET_INDEX(bus->self->device, devfn)];
223 
224 	if ((offset) && (where == offset))
225 		value = value & ~PCI_EXP_LNKCTL_ASPMC;
226 
227 	return raw_pci_write(pci_domain_nr(bus), bus->number,
228 						devfn, where, size, value);
229 }
230 
231 static struct pci_ops quirk_pcie_aspm_ops = {
232 	.read = quirk_pcie_aspm_read,
233 	.write = quirk_pcie_aspm_write,
234 };
235 
236 /*
237  * Prevents PCI Express ASPM (Active State Power Management) being enabled.
238  *
239  * Save the register offset, where the ASPM control bits are located,
240  * for each PCI Express device that is in the device list of
241  * the root port in an array for fast indexing. Replace the bus ops
242  * with the modified one.
243  */
244 static void pcie_rootport_aspm_quirk(struct pci_dev *pdev)
245 {
246 	int i;
247 	struct pci_bus  *pbus;
248 	struct pci_dev *dev;
249 
250 	if ((pbus = pdev->subordinate) == NULL)
251 		return;
252 
253 	/*
254 	 * Check if the DID of pdev matches one of the six root ports. This
255 	 * check is needed in the case this function is called directly by the
256 	 * hot-plug driver.
257 	 */
258 	if ((pdev->device < PCI_DEVICE_ID_INTEL_MCH_PA) ||
259 	    (pdev->device > PCI_DEVICE_ID_INTEL_MCH_PC1))
260 		return;
261 
262 	if (list_empty(&pbus->devices)) {
263 		/*
264 		 * If no device is attached to the root port at power-up or
265 		 * after hot-remove, the pbus->devices is empty and this code
266 		 * will set the offsets to zero and the bus ops to parent's bus
267 		 * ops, which is unmodified.
268 		 */
269 		for (i = GET_INDEX(pdev->device, 0); i <= GET_INDEX(pdev->device, 7); ++i)
270 			quirk_aspm_offset[i] = 0;
271 
272 		pci_bus_set_ops(pbus, pbus->parent->ops);
273 	} else {
274 		/*
275 		 * If devices are attached to the root port at power-up or
276 		 * after hot-add, the code loops through the device list of
277 		 * each root port to save the register offsets and replace the
278 		 * bus ops.
279 		 */
280 		list_for_each_entry(dev, &pbus->devices, bus_list)
281 			/* There are 0 to 8 devices attached to this bus */
282 			quirk_aspm_offset[GET_INDEX(pdev->device, dev->devfn)] =
283 				dev->pcie_cap + PCI_EXP_LNKCTL;
284 
285 		pci_bus_set_ops(pbus, &quirk_pcie_aspm_ops);
286 		dev_info(&pbus->dev, "writes to ASPM control bits will be ignored\n");
287 	}
288 
289 }
290 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL,	PCI_DEVICE_ID_INTEL_MCH_PA,	pcie_rootport_aspm_quirk);
291 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL,	PCI_DEVICE_ID_INTEL_MCH_PA1,	pcie_rootport_aspm_quirk);
292 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL,	PCI_DEVICE_ID_INTEL_MCH_PB,	pcie_rootport_aspm_quirk);
293 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL,	PCI_DEVICE_ID_INTEL_MCH_PB1,	pcie_rootport_aspm_quirk);
294 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL,	PCI_DEVICE_ID_INTEL_MCH_PC,	pcie_rootport_aspm_quirk);
295 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL,	PCI_DEVICE_ID_INTEL_MCH_PC1,	pcie_rootport_aspm_quirk);
296 
297 /*
298  * Fixup to mark boot BIOS video selected by BIOS before it changes
299  *
300  * From information provided by "Jon Smirl" <jonsmirl@gmail.com>
301  *
302  * The standard boot ROM sequence for an x86 machine uses the BIOS
303  * to select an initial video card for boot display. This boot video
304  * card will have its BIOS copied to 0xC0000 in system RAM.
305  * IORESOURCE_ROM_SHADOW is used to associate the boot video
306  * card with this copy. On laptops this copy has to be used since
307  * the main ROM may be compressed or combined with another image.
308  * See pci_map_rom() for use of this flag. Before marking the device
309  * with IORESOURCE_ROM_SHADOW check if a vga_default_device is already set
310  * by either arch code or vga-arbitration; if so only apply the fixup to this
311  * already-determined primary video card.
312  */
313 
314 static void pci_fixup_video(struct pci_dev *pdev)
315 {
316 	struct pci_dev *bridge;
317 	struct pci_bus *bus;
318 	u16 config;
319 	struct resource *res;
320 
321 	/* Is VGA routed to us? */
322 	bus = pdev->bus;
323 	while (bus) {
324 		bridge = bus->self;
325 
326 		/*
327 		 * From information provided by
328 		 * "David Miller" <davem@davemloft.net>
329 		 * The bridge control register is valid for PCI header
330 		 * type BRIDGE, or CARDBUS. Host to PCI controllers use
331 		 * PCI header type NORMAL.
332 		 */
333 		if (bridge && (pci_is_bridge(bridge))) {
334 			pci_read_config_word(bridge, PCI_BRIDGE_CONTROL,
335 						&config);
336 			if (!(config & PCI_BRIDGE_CTL_VGA))
337 				return;
338 		}
339 		bus = bus->parent;
340 	}
341 	if (!vga_default_device() || pdev == vga_default_device()) {
342 		pci_read_config_word(pdev, PCI_COMMAND, &config);
343 		if (config & (PCI_COMMAND_IO | PCI_COMMAND_MEMORY)) {
344 			res = &pdev->resource[PCI_ROM_RESOURCE];
345 
346 			pci_disable_rom(pdev);
347 			if (res->parent)
348 				release_resource(res);
349 
350 			res->start = 0xC0000;
351 			res->end = res->start + 0x20000 - 1;
352 			res->flags = IORESOURCE_MEM | IORESOURCE_ROM_SHADOW |
353 				     IORESOURCE_PCI_FIXED;
354 			dev_info(&pdev->dev, "Video device with shadowed ROM at %pR\n",
355 				 res);
356 		}
357 	}
358 }
359 DECLARE_PCI_FIXUP_CLASS_HEADER(PCI_ANY_ID, PCI_ANY_ID,
360 			       PCI_CLASS_DISPLAY_VGA, 8, pci_fixup_video);
361 
362 
363 static const struct dmi_system_id msi_k8t_dmi_table[] = {
364 	{
365 		.ident = "MSI-K8T-Neo2Fir",
366 		.matches = {
367 			DMI_MATCH(DMI_SYS_VENDOR, "MSI"),
368 			DMI_MATCH(DMI_PRODUCT_NAME, "MS-6702E"),
369 		},
370 	},
371 	{}
372 };
373 
374 /*
375  * The AMD-Athlon64 board MSI "K8T Neo2-FIR" disables the onboard sound
376  * card if a PCI-soundcard is added.
377  *
378  * The BIOS only gives options "DISABLED" and "AUTO". This code sets
379  * the corresponding register-value to enable the soundcard.
380  *
381  * The soundcard is only enabled, if the mainboard is identified
382  * via DMI-tables and the soundcard is detected to be off.
383  */
384 static void pci_fixup_msi_k8t_onboard_sound(struct pci_dev *dev)
385 {
386 	unsigned char val;
387 	if (!dmi_check_system(msi_k8t_dmi_table))
388 		return; /* only applies to MSI K8T Neo2-FIR */
389 
390 	pci_read_config_byte(dev, 0x50, &val);
391 	if (val & 0x40) {
392 		pci_write_config_byte(dev, 0x50, val & (~0x40));
393 
394 		/* verify the change for status output */
395 		pci_read_config_byte(dev, 0x50, &val);
396 		if (val & 0x40)
397 			dev_info(&dev->dev, "Detected MSI K8T Neo2-FIR; "
398 					"can't enable onboard soundcard!\n");
399 		else
400 			dev_info(&dev->dev, "Detected MSI K8T Neo2-FIR; "
401 					"enabled onboard soundcard\n");
402 	}
403 }
404 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8237,
405 		pci_fixup_msi_k8t_onboard_sound);
406 DECLARE_PCI_FIXUP_RESUME(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8237,
407 		pci_fixup_msi_k8t_onboard_sound);
408 
409 /*
410  * Some Toshiba laptops need extra code to enable their TI TSB43AB22/A.
411  *
412  * We pretend to bring them out of full D3 state, and restore the proper
413  * IRQ, PCI cache line size, and BARs, otherwise the device won't function
414  * properly.  In some cases, the device will generate an interrupt on
415  * the wrong IRQ line, causing any devices sharing the line it's
416  * *supposed* to use to be disabled by the kernel's IRQ debug code.
417  */
418 static u16 toshiba_line_size;
419 
420 static const struct dmi_system_id toshiba_ohci1394_dmi_table[] = {
421 	{
422 		.ident = "Toshiba PS5 based laptop",
423 		.matches = {
424 			DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
425 			DMI_MATCH(DMI_PRODUCT_VERSION, "PS5"),
426 		},
427 	},
428 	{
429 		.ident = "Toshiba PSM4 based laptop",
430 		.matches = {
431 			DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
432 			DMI_MATCH(DMI_PRODUCT_VERSION, "PSM4"),
433 		},
434 	},
435 	{
436 		.ident = "Toshiba A40 based laptop",
437 		.matches = {
438 			DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
439 			DMI_MATCH(DMI_PRODUCT_VERSION, "PSA40U"),
440 		},
441 	},
442 	{ }
443 };
444 
445 static void pci_pre_fixup_toshiba_ohci1394(struct pci_dev *dev)
446 {
447 	if (!dmi_check_system(toshiba_ohci1394_dmi_table))
448 		return; /* only applies to certain Toshibas (so far) */
449 
450 	dev->current_state = PCI_D3cold;
451 	pci_read_config_word(dev, PCI_CACHE_LINE_SIZE, &toshiba_line_size);
452 }
453 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_TI, 0x8032,
454 			 pci_pre_fixup_toshiba_ohci1394);
455 
456 static void pci_post_fixup_toshiba_ohci1394(struct pci_dev *dev)
457 {
458 	if (!dmi_check_system(toshiba_ohci1394_dmi_table))
459 		return; /* only applies to certain Toshibas (so far) */
460 
461 	/* Restore config space on Toshiba laptops */
462 	pci_write_config_word(dev, PCI_CACHE_LINE_SIZE, toshiba_line_size);
463 	pci_read_config_byte(dev, PCI_INTERRUPT_LINE, (u8 *)&dev->irq);
464 	pci_write_config_dword(dev, PCI_BASE_ADDRESS_0,
465 			       pci_resource_start(dev, 0));
466 	pci_write_config_dword(dev, PCI_BASE_ADDRESS_1,
467 			       pci_resource_start(dev, 1));
468 }
469 DECLARE_PCI_FIXUP_ENABLE(PCI_VENDOR_ID_TI, 0x8032,
470 			 pci_post_fixup_toshiba_ohci1394);
471 
472 
473 /*
474  * Prevent the BIOS trapping accesses to the Cyrix CS5530A video device
475  * configuration space.
476  */
477 static void pci_early_fixup_cyrix_5530(struct pci_dev *dev)
478 {
479 	u8 r;
480 	/* clear 'F4 Video Configuration Trap' bit */
481 	pci_read_config_byte(dev, 0x42, &r);
482 	r &= 0xfd;
483 	pci_write_config_byte(dev, 0x42, r);
484 }
485 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_CYRIX, PCI_DEVICE_ID_CYRIX_5530_LEGACY,
486 			pci_early_fixup_cyrix_5530);
487 DECLARE_PCI_FIXUP_RESUME(PCI_VENDOR_ID_CYRIX, PCI_DEVICE_ID_CYRIX_5530_LEGACY,
488 			pci_early_fixup_cyrix_5530);
489 
490 /*
491  * Siemens Nixdorf AG FSC Multiprocessor Interrupt Controller:
492  * prevent update of the BAR0, which doesn't look like a normal BAR.
493  */
494 static void pci_siemens_interrupt_controller(struct pci_dev *dev)
495 {
496 	dev->resource[0].flags |= IORESOURCE_PCI_FIXED;
497 }
498 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SIEMENS, 0x0015,
499 			  pci_siemens_interrupt_controller);
500 
501 /*
502  * SB600: Disable BAR1 on device 14.0 to avoid HPET resources from
503  * confusing the PCI engine:
504  */
505 static void sb600_disable_hpet_bar(struct pci_dev *dev)
506 {
507 	u8 val;
508 
509 	/*
510 	 * The SB600 and SB700 both share the same device
511 	 * ID, but the PM register 0x55 does something different
512 	 * for the SB700, so make sure we are dealing with the
513 	 * SB600 before touching the bit:
514 	 */
515 
516 	pci_read_config_byte(dev, 0x08, &val);
517 
518 	if (val < 0x2F) {
519 		outb(0x55, 0xCD6);
520 		val = inb(0xCD7);
521 
522 		/* Set bit 7 in PM register 0x55 */
523 		outb(0x55, 0xCD6);
524 		outb(val | 0x80, 0xCD7);
525 	}
526 }
527 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_ATI, 0x4385, sb600_disable_hpet_bar);
528 
529 #ifdef CONFIG_HPET_TIMER
530 static void sb600_hpet_quirk(struct pci_dev *dev)
531 {
532 	struct resource *r = &dev->resource[1];
533 
534 	if (r->flags & IORESOURCE_MEM && r->start == hpet_address) {
535 		r->flags |= IORESOURCE_PCI_FIXED;
536 		dev_info(&dev->dev, "reg 0x14 contains HPET; making it immovable\n");
537 	}
538 }
539 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_ATI, 0x4385, sb600_hpet_quirk);
540 #endif
541 
542 /*
543  * Twinhead H12Y needs us to block out a region otherwise we map devices
544  * there and any access kills the box.
545  *
546  *   See: https://bugzilla.kernel.org/show_bug.cgi?id=10231
547  *
548  * Match off the LPC and svid/sdid (older kernels lose the bridge subvendor)
549  */
550 static void twinhead_reserve_killing_zone(struct pci_dev *dev)
551 {
552         if (dev->subsystem_vendor == 0x14FF && dev->subsystem_device == 0xA003) {
553                 pr_info("Reserving memory on Twinhead H12Y\n");
554                 request_mem_region(0xFFB00000, 0x100000, "twinhead");
555         }
556 }
557 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x27B9, twinhead_reserve_killing_zone);
558 
559 /*
560  * Device [8086:2fc0]
561  * Erratum HSE43
562  * CONFIG_TDP_NOMINAL CSR Implemented at Incorrect Offset
563  * https://www.intel.com/content/www/us/en/processors/xeon/xeon-e5-v3-spec-update.html
564  *
565  * Devices [8086:6f60,6fa0,6fc0]
566  * Erratum BDF2
567  * PCI BARs in the Home Agent Will Return Non-Zero Values During Enumeration
568  * https://www.intel.com/content/www/us/en/processors/xeon/xeon-e5-v4-spec-update.html
569  */
570 static void pci_invalid_bar(struct pci_dev *dev)
571 {
572 	dev->non_compliant_bars = 1;
573 }
574 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0x2fc0, pci_invalid_bar);
575 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0x6f60, pci_invalid_bar);
576 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0x6fa0, pci_invalid_bar);
577 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0x6fc0, pci_invalid_bar);
578 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0xa1ec, pci_invalid_bar);
579 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0xa1ed, pci_invalid_bar);
580 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0xa26c, pci_invalid_bar);
581 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0xa26d, pci_invalid_bar);
582 
583 /*
584  * Device [1022:7808]
585  * 23. USB Wake on Connect/Disconnect with Low Speed Devices
586  * https://support.amd.com/TechDocs/46837.pdf
587  * Appendix A2
588  * https://support.amd.com/TechDocs/42413.pdf
589  */
590 static void pci_fixup_amd_ehci_pme(struct pci_dev *dev)
591 {
592 	dev_info(&dev->dev, "PME# does not work under D3, disabling it\n");
593 	dev->pme_support &= ~((PCI_PM_CAP_PME_D3hot | PCI_PM_CAP_PME_D3cold)
594 		>> PCI_PM_CAP_PME_SHIFT);
595 }
596 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_AMD, 0x7808, pci_fixup_amd_ehci_pme);
597 
598 /*
599  * Device [1022:7914]
600  * When in D0, PME# doesn't get asserted when plugging USB 2.0 device.
601  */
602 static void pci_fixup_amd_fch_xhci_pme(struct pci_dev *dev)
603 {
604 	dev_info(&dev->dev, "PME# does not work under D0, disabling it\n");
605 	dev->pme_support &= ~(PCI_PM_CAP_PME_D0 >> PCI_PM_CAP_PME_SHIFT);
606 }
607 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_AMD, 0x7914, pci_fixup_amd_fch_xhci_pme);
608 
609 /*
610  * Apple MacBook Pro: Avoid [mem 0x7fa00000-0x7fbfffff]
611  *
612  * Using the [mem 0x7fa00000-0x7fbfffff] region, e.g., by assigning it to
613  * the 00:1c.0 Root Port, causes a conflict with [io 0x1804], which is used
614  * for soft poweroff and suspend-to-RAM.
615  *
616  * As far as we know, this is related to the address space, not to the Root
617  * Port itself.  Attaching the quirk to the Root Port is a convenience, but
618  * it could probably also be a standalone DMI quirk.
619  *
620  * https://bugzilla.kernel.org/show_bug.cgi?id=103211
621  */
622 static void quirk_apple_mbp_poweroff(struct pci_dev *pdev)
623 {
624 	struct device *dev = &pdev->dev;
625 	struct resource *res;
626 
627 	if ((!dmi_match(DMI_PRODUCT_NAME, "MacBookPro11,4") &&
628 	     !dmi_match(DMI_PRODUCT_NAME, "MacBookPro11,5")) ||
629 	    pdev->bus->number != 0 || pdev->devfn != PCI_DEVFN(0x1c, 0))
630 		return;
631 
632 	res = request_mem_region(0x7fa00000, 0x200000,
633 				 "MacBook Pro poweroff workaround");
634 	if (res)
635 		dev_info(dev, "claimed %s %pR\n", res->name, res);
636 	else
637 		dev_info(dev, "can't work around MacBook Pro poweroff issue\n");
638 }
639 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x8c10, quirk_apple_mbp_poweroff);
640 
641 /*
642  * VMD-enabled root ports will change the source ID for all messages
643  * to the VMD device. Rather than doing device matching with the source
644  * ID, the AER driver should traverse the child device tree, reading
645  * AER registers to find the faulting device.
646  */
647 static void quirk_no_aersid(struct pci_dev *pdev)
648 {
649 	/* VMD Domain */
650 	if (is_vmd(pdev->bus) && pci_is_root_bus(pdev->bus))
651 		pdev->bus->bus_flags |= PCI_BUS_FLAGS_NO_AERSID;
652 }
653 DECLARE_PCI_FIXUP_CLASS_EARLY(PCI_VENDOR_ID_INTEL, PCI_ANY_ID,
654 			      PCI_CLASS_BRIDGE_PCI, 8, quirk_no_aersid);
655 
656 static void quirk_intel_th_dnv(struct pci_dev *dev)
657 {
658 	struct resource *r = &dev->resource[4];
659 
660 	/*
661 	 * Denverton reports 2k of RTIT_BAR (intel_th resource 4), which
662 	 * appears to be 4 MB in reality.
663 	 */
664 	if (r->end == r->start + 0x7ff) {
665 		r->start = 0;
666 		r->end   = 0x3fffff;
667 		r->flags |= IORESOURCE_UNSET;
668 	}
669 }
670 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x19e1, quirk_intel_th_dnv);
671 
672 #ifdef CONFIG_PHYS_ADDR_T_64BIT
673 
674 #define AMD_141b_MMIO_BASE(x)	(0x80 + (x) * 0x8)
675 #define AMD_141b_MMIO_BASE_RE_MASK		BIT(0)
676 #define AMD_141b_MMIO_BASE_WE_MASK		BIT(1)
677 #define AMD_141b_MMIO_BASE_MMIOBASE_MASK	GENMASK(31,8)
678 
679 #define AMD_141b_MMIO_LIMIT(x)	(0x84 + (x) * 0x8)
680 #define AMD_141b_MMIO_LIMIT_MMIOLIMIT_MASK	GENMASK(31,8)
681 
682 #define AMD_141b_MMIO_HIGH(x)	(0x180 + (x) * 0x4)
683 #define AMD_141b_MMIO_HIGH_MMIOBASE_MASK	GENMASK(7,0)
684 #define AMD_141b_MMIO_HIGH_MMIOLIMIT_SHIFT	16
685 #define AMD_141b_MMIO_HIGH_MMIOLIMIT_MASK	GENMASK(23,16)
686 
687 /*
688  * The PCI Firmware Spec, rev 3.2, notes that ACPI should optionally allow
689  * configuring host bridge windows using the _PRS and _SRS methods.
690  *
691  * But this is rarely implemented, so we manually enable a large 64bit BAR for
692  * PCIe device on AMD Family 15h (Models 00h-1fh, 30h-3fh, 60h-7fh) Processors
693  * here.
694  */
695 static void pci_amd_enable_64bit_bar(struct pci_dev *dev)
696 {
697 	static const char *name = "PCI Bus 0000:00";
698 	struct resource *res, *conflict;
699 	u32 base, limit, high;
700 	struct pci_dev *other;
701 	unsigned i;
702 
703 	if (!(pci_probe & PCI_BIG_ROOT_WINDOW))
704 		return;
705 
706 	/* Check that we are the only device of that type */
707 	other = pci_get_device(dev->vendor, dev->device, NULL);
708 	if (other != dev ||
709 	    (other = pci_get_device(dev->vendor, dev->device, other))) {
710 		/* This is a multi-socket system, don't touch it for now */
711 		pci_dev_put(other);
712 		return;
713 	}
714 
715 	for (i = 0; i < 8; i++) {
716 		pci_read_config_dword(dev, AMD_141b_MMIO_BASE(i), &base);
717 		pci_read_config_dword(dev, AMD_141b_MMIO_HIGH(i), &high);
718 
719 		/* Is this slot free? */
720 		if (!(base & (AMD_141b_MMIO_BASE_RE_MASK |
721 			      AMD_141b_MMIO_BASE_WE_MASK)))
722 			break;
723 
724 		base >>= 8;
725 		base |= high << 24;
726 
727 		/* Abort if a slot already configures a 64bit BAR. */
728 		if (base > 0x10000)
729 			return;
730 	}
731 	if (i == 8)
732 		return;
733 
734 	res = kzalloc(sizeof(*res), GFP_KERNEL);
735 	if (!res)
736 		return;
737 
738 	/*
739 	 * Allocate a 256GB window directly below the 0xfd00000000 hardware
740 	 * limit (see AMD Family 15h Models 30h-3Fh BKDG, sec 2.4.6).
741 	 */
742 	res->name = name;
743 	res->flags = IORESOURCE_PREFETCH | IORESOURCE_MEM |
744 		IORESOURCE_MEM_64 | IORESOURCE_WINDOW;
745 	res->start = 0xbd00000000ull;
746 	res->end = 0xfd00000000ull - 1;
747 
748 	conflict = request_resource_conflict(&iomem_resource, res);
749 	if (conflict) {
750 		kfree(res);
751 		if (conflict->name != name)
752 			return;
753 
754 		/* We are resuming from suspend; just reenable the window */
755 		res = conflict;
756 	} else {
757 		dev_info(&dev->dev, "adding root bus resource %pR (tainting kernel)\n",
758 			 res);
759 		add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_STILL_OK);
760 		pci_bus_add_resource(dev->bus, res, 0);
761 	}
762 
763 	base = ((res->start >> 8) & AMD_141b_MMIO_BASE_MMIOBASE_MASK) |
764 		AMD_141b_MMIO_BASE_RE_MASK | AMD_141b_MMIO_BASE_WE_MASK;
765 	limit = ((res->end + 1) >> 8) & AMD_141b_MMIO_LIMIT_MMIOLIMIT_MASK;
766 	high = ((res->start >> 40) & AMD_141b_MMIO_HIGH_MMIOBASE_MASK) |
767 		((((res->end + 1) >> 40) << AMD_141b_MMIO_HIGH_MMIOLIMIT_SHIFT)
768 		 & AMD_141b_MMIO_HIGH_MMIOLIMIT_MASK);
769 
770 	pci_write_config_dword(dev, AMD_141b_MMIO_HIGH(i), high);
771 	pci_write_config_dword(dev, AMD_141b_MMIO_LIMIT(i), limit);
772 	pci_write_config_dword(dev, AMD_141b_MMIO_BASE(i), base);
773 }
774 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_AMD, 0x1401, pci_amd_enable_64bit_bar);
775 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_AMD, 0x141b, pci_amd_enable_64bit_bar);
776 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_AMD, 0x1571, pci_amd_enable_64bit_bar);
777 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_AMD, 0x15b1, pci_amd_enable_64bit_bar);
778 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_AMD, 0x1601, pci_amd_enable_64bit_bar);
779 DECLARE_PCI_FIXUP_RESUME(PCI_VENDOR_ID_AMD, 0x1401, pci_amd_enable_64bit_bar);
780 DECLARE_PCI_FIXUP_RESUME(PCI_VENDOR_ID_AMD, 0x141b, pci_amd_enable_64bit_bar);
781 DECLARE_PCI_FIXUP_RESUME(PCI_VENDOR_ID_AMD, 0x1571, pci_amd_enable_64bit_bar);
782 DECLARE_PCI_FIXUP_RESUME(PCI_VENDOR_ID_AMD, 0x15b1, pci_amd_enable_64bit_bar);
783 DECLARE_PCI_FIXUP_RESUME(PCI_VENDOR_ID_AMD, 0x1601, pci_amd_enable_64bit_bar);
784 
785 #define RS690_LOWER_TOP_OF_DRAM2	0x30
786 #define RS690_LOWER_TOP_OF_DRAM2_VALID	0x1
787 #define RS690_UPPER_TOP_OF_DRAM2	0x31
788 #define RS690_HTIU_NB_INDEX		0xA8
789 #define RS690_HTIU_NB_INDEX_WR_ENABLE	0x100
790 #define RS690_HTIU_NB_DATA		0xAC
791 
792 /*
793  * Some BIOS implementations support RAM above 4GB, but do not configure the
794  * PCI host to respond to bus master accesses for these addresses. These
795  * implementations set the TOP_OF_DRAM_SLOT1 register correctly, so PCI DMA
796  * works as expected for addresses below 4GB.
797  *
798  * Reference: "AMD RS690 ASIC Family Register Reference Guide" (pg. 2-57)
799  * https://www.amd.com/system/files/TechDocs/43372_rs690_rrg_3.00o.pdf
800  */
801 static void rs690_fix_64bit_dma(struct pci_dev *pdev)
802 {
803 	u32 val = 0;
804 	phys_addr_t top_of_dram = __pa(high_memory - 1) + 1;
805 
806 	if (top_of_dram <= (1ULL << 32))
807 		return;
808 
809 	pci_write_config_dword(pdev, RS690_HTIU_NB_INDEX,
810 				RS690_LOWER_TOP_OF_DRAM2);
811 	pci_read_config_dword(pdev, RS690_HTIU_NB_DATA, &val);
812 
813 	if (val)
814 		return;
815 
816 	pci_info(pdev, "Adjusting top of DRAM to %pa for 64-bit DMA support\n", &top_of_dram);
817 
818 	pci_write_config_dword(pdev, RS690_HTIU_NB_INDEX,
819 		RS690_UPPER_TOP_OF_DRAM2 | RS690_HTIU_NB_INDEX_WR_ENABLE);
820 	pci_write_config_dword(pdev, RS690_HTIU_NB_DATA, top_of_dram >> 32);
821 
822 	pci_write_config_dword(pdev, RS690_HTIU_NB_INDEX,
823 		RS690_LOWER_TOP_OF_DRAM2 | RS690_HTIU_NB_INDEX_WR_ENABLE);
824 	pci_write_config_dword(pdev, RS690_HTIU_NB_DATA,
825 		top_of_dram | RS690_LOWER_TOP_OF_DRAM2_VALID);
826 }
827 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATI, 0x7910, rs690_fix_64bit_dma);
828 
829 #endif
830 
831 #ifdef CONFIG_AMD_NB
832 
833 #define AMD_15B8_RCC_DEV2_EPF0_STRAP2                                  0x10136008
834 #define AMD_15B8_RCC_DEV2_EPF0_STRAP2_NO_SOFT_RESET_DEV2_F0_MASK       0x00000080L
835 
836 static void quirk_clear_strap_no_soft_reset_dev2_f0(struct pci_dev *dev)
837 {
838 	u32 data;
839 
840 	if (!amd_smn_read(0, AMD_15B8_RCC_DEV2_EPF0_STRAP2, &data)) {
841 		data &= ~AMD_15B8_RCC_DEV2_EPF0_STRAP2_NO_SOFT_RESET_DEV2_F0_MASK;
842 		if (amd_smn_write(0, AMD_15B8_RCC_DEV2_EPF0_STRAP2, data))
843 			pci_err(dev, "Failed to write data 0x%x\n", data);
844 	} else {
845 		pci_err(dev, "Failed to read data\n");
846 	}
847 }
848 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_AMD, 0x15b8, quirk_clear_strap_no_soft_reset_dev2_f0);
849 #endif
850 
851 /*
852  * When returning from D3cold to D0, firmware on some Google Coral and Reef
853  * family Chromebooks with Intel Apollo Lake SoC clobbers the headers of
854  * both the L1 PM Substates capability and the previous capability for the
855  * "Celeron N3350/Pentium N4200/Atom E3900 Series PCI Express Port B #1".
856  *
857  * Save those values at enumeration-time and restore them at resume.
858  */
859 
860 static u16 prev_cap, l1ss_cap;
861 static u32 prev_header, l1ss_header;
862 
863 static void chromeos_save_apl_pci_l1ss_capability(struct pci_dev *dev)
864 {
865 	int pos = PCI_CFG_SPACE_SIZE, prev = 0;
866 	u32 header, pheader = 0;
867 
868 	while (pos) {
869 		pci_read_config_dword(dev, pos, &header);
870 		if (PCI_EXT_CAP_ID(header) == PCI_EXT_CAP_ID_L1SS) {
871 			prev_cap = prev;
872 			prev_header = pheader;
873 			l1ss_cap = pos;
874 			l1ss_header = header;
875 			return;
876 		}
877 
878 		prev = pos;
879 		pheader = header;
880 		pos = PCI_EXT_CAP_NEXT(header);
881 	}
882 }
883 
884 static void chromeos_fixup_apl_pci_l1ss_capability(struct pci_dev *dev)
885 {
886 	u32 header;
887 
888 	if (!prev_cap || !prev_header || !l1ss_cap || !l1ss_header)
889 		return;
890 
891 	/* Fixup the header of L1SS Capability if missing */
892 	pci_read_config_dword(dev, l1ss_cap, &header);
893 	if (header != l1ss_header) {
894 		pci_write_config_dword(dev, l1ss_cap, l1ss_header);
895 		pci_info(dev, "restore L1SS Capability header (was %#010x now %#010x)\n",
896 			 header, l1ss_header);
897 	}
898 
899 	/* Fixup the link to L1SS Capability if missing */
900 	pci_read_config_dword(dev, prev_cap, &header);
901 	if (header != prev_header) {
902 		pci_write_config_dword(dev, prev_cap, prev_header);
903 		pci_info(dev, "restore previous Capability header (was %#010x now %#010x)\n",
904 			 header, prev_header);
905 	}
906 }
907 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, 0x5ad6, chromeos_save_apl_pci_l1ss_capability);
908 DECLARE_PCI_FIXUP_RESUME(PCI_VENDOR_ID_INTEL, 0x5ad6, chromeos_fixup_apl_pci_l1ss_capability);
909 
910 /*
911  * Disable D3cold on Asus B1400 PCI-NVMe bridge
912  *
913  * On this platform with VMD off, the NVMe device cannot successfully power
914  * back on from D3cold. This appears to be an untested transition by the
915  * vendor: Windows leaves the NVMe and parent bridge in D0 during suspend.
916  *
917  * We disable D3cold on the parent bridge for simplicity, and the fact that
918  * both parent bridge and NVMe device share the same power resource.
919  *
920  * This is only needed on BIOS versions before 308; the newer versions flip
921  * StorageD3Enable from 1 to 0.
922  */
923 static const struct dmi_system_id asus_nvme_broken_d3cold_table[] = {
924 	{
925 		.matches = {
926 				DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
927 				DMI_MATCH(DMI_BIOS_VERSION, "B1400CEAE.304"),
928 		},
929 	},
930 	{
931 		.matches = {
932 				DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
933 				DMI_MATCH(DMI_BIOS_VERSION, "B1400CEAE.305"),
934 		},
935 	},
936 	{
937 		.matches = {
938 				DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
939 				DMI_MATCH(DMI_BIOS_VERSION, "B1400CEAE.306"),
940 		},
941 	},
942 	{
943 		.matches = {
944 				DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
945 				DMI_MATCH(DMI_BIOS_VERSION, "B1400CEAE.307"),
946 		},
947 	},
948 	{}
949 };
950 
951 static void asus_disable_nvme_d3cold(struct pci_dev *pdev)
952 {
953 	if (dmi_check_system(asus_nvme_broken_d3cold_table) > 0)
954 		pci_d3cold_disable(pdev);
955 }
956 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, 0x9a09, asus_disable_nvme_d3cold);
957 
958 #ifdef CONFIG_SUSPEND
959 /*
960  * Root Ports on some AMD SoCs advertise PME_Support for D3hot and D3cold, but
961  * if the SoC is put into a hardware sleep state by the amd-pmc driver, the
962  * Root Ports don't generate wakeup interrupts for USB devices.
963  *
964  * When suspending, remove D3hot and D3cold from the PME_Support advertised
965  * by the Root Port so we don't use those states if we're expecting wakeup
966  * interrupts.  Restore the advertised PME_Support when resuming.
967  */
968 static void amd_rp_pme_suspend(struct pci_dev *dev)
969 {
970 	struct pci_dev *rp;
971 
972 	/*
973 	 * PM_SUSPEND_ON means we're doing runtime suspend, which means
974 	 * amd-pmc will not be involved so PMEs during D3 work as advertised.
975 	 *
976 	 * The PMEs *do* work if amd-pmc doesn't put the SoC in the hardware
977 	 * sleep state, but we assume amd-pmc is always present.
978 	 */
979 	if (pm_suspend_target_state == PM_SUSPEND_ON)
980 		return;
981 
982 	rp = pcie_find_root_port(dev);
983 	if (!rp || !rp->pm_cap)
984 		return;
985 
986 	rp->pme_support &= ~((PCI_PM_CAP_PME_D3hot|PCI_PM_CAP_PME_D3cold) >>
987 				    PCI_PM_CAP_PME_SHIFT);
988 	dev_info_once(&rp->dev, "quirk: disabling D3cold for suspend\n");
989 }
990 
991 static void amd_rp_pme_resume(struct pci_dev *dev)
992 {
993 	struct pci_dev *rp;
994 	u16 pmc;
995 
996 	rp = pcie_find_root_port(dev);
997 	if (!rp || !rp->pm_cap)
998 		return;
999 
1000 	pci_read_config_word(rp, rp->pm_cap + PCI_PM_PMC, &pmc);
1001 	rp->pme_support = FIELD_GET(PCI_PM_CAP_PME_MASK, pmc);
1002 }
1003 /* Rembrandt (yellow_carp) */
1004 DECLARE_PCI_FIXUP_SUSPEND(PCI_VENDOR_ID_AMD, 0x162e, amd_rp_pme_suspend);
1005 DECLARE_PCI_FIXUP_RESUME(PCI_VENDOR_ID_AMD, 0x162e, amd_rp_pme_resume);
1006 DECLARE_PCI_FIXUP_SUSPEND(PCI_VENDOR_ID_AMD, 0x162f, amd_rp_pme_suspend);
1007 DECLARE_PCI_FIXUP_RESUME(PCI_VENDOR_ID_AMD, 0x162f, amd_rp_pme_resume);
1008 /* Phoenix (pink_sardine) */
1009 DECLARE_PCI_FIXUP_SUSPEND(PCI_VENDOR_ID_AMD, 0x1668, amd_rp_pme_suspend);
1010 DECLARE_PCI_FIXUP_RESUME(PCI_VENDOR_ID_AMD, 0x1668, amd_rp_pme_resume);
1011 DECLARE_PCI_FIXUP_SUSPEND(PCI_VENDOR_ID_AMD, 0x1669, amd_rp_pme_suspend);
1012 DECLARE_PCI_FIXUP_RESUME(PCI_VENDOR_ID_AMD, 0x1669, amd_rp_pme_resume);
1013 #endif /* CONFIG_SUSPEND */
1014