2 * Copyright(c) 2015 - 2017 Intel Corporation.
4 * This file is provided under a dual BSD/GPLv2 license. When using or
5 * redistributing this file, you may do so under either license.
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of version 2 of the GNU General Public License as
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15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
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48 #include <linux/bitfield.h>
49 #include <linux/pci.h>
51 #include <linux/delay.h>
52 #include <linux/vmalloc.h>
53 #include <linux/aer.h>
54 #include <linux/module.h>
57 #include "chip_registers.h"
60 /* link speed vector for Gen3 speed - not in Linux headers */
61 #define GEN1_SPEED_VECTOR 0x1
62 #define GEN2_SPEED_VECTOR 0x2
63 #define GEN3_SPEED_VECTOR 0x3
66 * This file contains PCIe utility routines.
70 * Code to adjust PCIe capabilities.
72 static void tune_pcie_caps(struct hfi1_devdata *);
75 * Do all the common PCIe setup and initialization.
76 * devdata is not yet allocated, and is not allocated until after this
77 * routine returns success. Therefore dd_dev_err() can't be used for error
80 int hfi1_pcie_init(struct pci_dev *pdev, const struct pci_device_id *ent)
84 ret = pci_enable_device(pdev);
87 * This can happen (in theory) iff:
88 * We did a chip reset, and then failed to reprogram the
89 * BAR, or the chip reset due to an internal error. We then
90 * unloaded the driver and reloaded it.
92 * Both reset cases set the BAR back to initial state. For
93 * the latter case, the AER sticky error bit at offset 0x718
94 * should be set, but the Linux kernel doesn't yet know
95 * about that, it appears. If the original BAR was retained
96 * in the kernel data structures, this may be OK.
98 hfi1_early_err(&pdev->dev, "pci enable failed: error %d\n",
103 ret = pci_request_regions(pdev, DRIVER_NAME);
105 hfi1_early_err(&pdev->dev,
106 "pci_request_regions fails: err %d\n", -ret);
110 ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
113 * If the 64 bit setup fails, try 32 bit. Some systems
114 * do not setup 64 bit maps on systems with 2GB or less
117 ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
119 hfi1_early_err(&pdev->dev,
120 "Unable to set DMA mask: %d\n", ret);
123 ret = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
125 ret = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
128 hfi1_early_err(&pdev->dev,
129 "Unable to set DMA consistent mask: %d\n", ret);
133 pci_set_master(pdev);
134 (void)pci_enable_pcie_error_reporting(pdev);
138 hfi1_pcie_cleanup(pdev);
144 * Clean what was done in hfi1_pcie_init()
146 void hfi1_pcie_cleanup(struct pci_dev *pdev)
148 pci_disable_device(pdev);
150 * Release regions should be called after the disable. OK to
151 * call if request regions has not been called or failed.
153 pci_release_regions(pdev);
157 * Do remaining PCIe setup, once dd is allocated, and save away
158 * fields required to re-initialize after a chip reset, or for
159 * various other purposes
161 int hfi1_pcie_ddinit(struct hfi1_devdata *dd, struct pci_dev *pdev)
164 resource_size_t addr;
167 addr = pci_resource_start(pdev, 0);
168 len = pci_resource_len(pdev, 0);
171 * The TXE PIO buffers are at the tail end of the chip space.
172 * Cut them off and map them separately.
175 /* sanity check vs expectations */
176 if (len != TXE_PIO_SEND + TXE_PIO_SIZE) {
177 dd_dev_err(dd, "chip PIO range does not match\n");
181 dd->kregbase1 = ioremap_nocache(addr, RCV_ARRAY);
182 if (!dd->kregbase1) {
183 dd_dev_err(dd, "UC mapping of kregbase1 failed\n");
186 dd_dev_info(dd, "UC base1: %p for %x\n", dd->kregbase1, RCV_ARRAY);
187 dd->chip_rcv_array_count = readq(dd->kregbase1 + RCV_ARRAY_CNT);
188 dd_dev_info(dd, "RcvArray count: %u\n", dd->chip_rcv_array_count);
189 dd->base2_start = RCV_ARRAY + dd->chip_rcv_array_count * 8;
191 dd->kregbase2 = ioremap_nocache(
192 addr + dd->base2_start,
193 TXE_PIO_SEND - dd->base2_start);
194 if (!dd->kregbase2) {
195 dd_dev_err(dd, "UC mapping of kregbase2 failed\n");
198 dd_dev_info(dd, "UC base2: %p for %x\n", dd->kregbase2,
199 TXE_PIO_SEND - dd->base2_start);
201 dd->piobase = ioremap_wc(addr + TXE_PIO_SEND, TXE_PIO_SIZE);
203 dd_dev_err(dd, "WC mapping of send buffers failed\n");
206 dd_dev_info(dd, "WC piobase: %p\n for %x", dd->piobase, TXE_PIO_SIZE);
208 dd->physaddr = addr; /* used for io_remap, etc. */
211 * Map the chip's RcvArray as write-combining to allow us
212 * to write an entire cacheline worth of entries in one shot.
214 dd->rcvarray_wc = ioremap_wc(addr + RCV_ARRAY,
215 dd->chip_rcv_array_count * 8);
216 if (!dd->rcvarray_wc) {
217 dd_dev_err(dd, "WC mapping of receive array failed\n");
220 dd_dev_info(dd, "WC RcvArray: %p for %x\n",
221 dd->rcvarray_wc, dd->chip_rcv_array_count * 8);
223 dd->flags |= HFI1_PRESENT; /* chip.c CSR routines now work */
227 hfi1_pcie_ddcleanup(dd);
232 * Do PCIe cleanup related to dd, after chip-specific cleanup, etc. Just prior
233 * to releasing the dd memory.
234 * Void because all of the core pcie cleanup functions are void.
236 void hfi1_pcie_ddcleanup(struct hfi1_devdata *dd)
238 dd->flags &= ~HFI1_PRESENT;
240 iounmap(dd->kregbase1);
241 dd->kregbase1 = NULL;
243 iounmap(dd->kregbase2);
244 dd->kregbase2 = NULL;
246 iounmap(dd->rcvarray_wc);
247 dd->rcvarray_wc = NULL;
249 iounmap(dd->piobase);
253 /* return the PCIe link speed from the given link status */
254 static u32 extract_speed(u16 linkstat)
258 switch (linkstat & PCI_EXP_LNKSTA_CLS) {
259 default: /* not defined, assume Gen1 */
260 case PCI_EXP_LNKSTA_CLS_2_5GB:
261 speed = 2500; /* Gen 1, 2.5GHz */
263 case PCI_EXP_LNKSTA_CLS_5_0GB:
264 speed = 5000; /* Gen 2, 5GHz */
266 case GEN3_SPEED_VECTOR:
267 speed = 8000; /* Gen 3, 8GHz */
273 /* read the link status and set dd->{lbus_width,lbus_speed,lbus_info} */
274 static void update_lbus_info(struct hfi1_devdata *dd)
279 ret = pcie_capability_read_word(dd->pcidev, PCI_EXP_LNKSTA, &linkstat);
281 dd_dev_err(dd, "Unable to read from PCI config\n");
285 dd->lbus_width = FIELD_GET(PCI_EXP_LNKSTA_NLW, linkstat);
286 dd->lbus_speed = extract_speed(linkstat);
287 snprintf(dd->lbus_info, sizeof(dd->lbus_info),
288 "PCIe,%uMHz,x%u", dd->lbus_speed, dd->lbus_width);
292 * Read in the current PCIe link width and speed. Find if the link is
295 int pcie_speeds(struct hfi1_devdata *dd)
298 struct pci_dev *parent = dd->pcidev->bus->self;
301 if (!pci_is_pcie(dd->pcidev)) {
302 dd_dev_err(dd, "Can't find PCI Express capability!\n");
306 /* find if our max speed is Gen3 and parent supports Gen3 speeds */
307 dd->link_gen3_capable = 1;
309 ret = pcie_capability_read_dword(dd->pcidev, PCI_EXP_LNKCAP, &linkcap);
311 dd_dev_err(dd, "Unable to read from PCI config\n");
315 if ((linkcap & PCI_EXP_LNKCAP_SLS) != GEN3_SPEED_VECTOR) {
317 "This HFI is not Gen3 capable, max speed 0x%x, need 0x3\n",
318 linkcap & PCI_EXP_LNKCAP_SLS);
319 dd->link_gen3_capable = 0;
323 * bus->max_bus_speed is set from the bridge's linkcap Max Link Speed
326 (dd->pcidev->bus->max_bus_speed == PCIE_SPEED_2_5GT ||
327 dd->pcidev->bus->max_bus_speed == PCIE_SPEED_5_0GT)) {
328 dd_dev_info(dd, "Parent PCIe bridge does not support Gen3\n");
329 dd->link_gen3_capable = 0;
332 /* obtain the link width and current speed */
333 update_lbus_info(dd);
335 dd_dev_info(dd, "%s\n", dd->lbus_info);
342 * - actual number of interrupts allocated or
343 * - 0 if fell back to INTx.
346 int request_msix(struct hfi1_devdata *dd, u32 msireq)
350 nvec = pci_alloc_irq_vectors(dd->pcidev, 1, msireq,
351 PCI_IRQ_MSIX | PCI_IRQ_LEGACY);
353 dd_dev_err(dd, "pci_alloc_irq_vectors() failed: %d\n", nvec);
359 /* check for legacy IRQ */
360 if (nvec == 1 && !dd->pcidev->msix_enabled)
366 /* restore command and BARs after a reset has wiped them out */
367 int restore_pci_variables(struct hfi1_devdata *dd)
371 ret = pci_write_config_word(dd->pcidev, PCI_COMMAND, dd->pci_command);
375 ret = pci_write_config_dword(dd->pcidev, PCI_BASE_ADDRESS_0,
380 ret = pci_write_config_dword(dd->pcidev, PCI_BASE_ADDRESS_1,
385 ret = pci_write_config_dword(dd->pcidev, PCI_ROM_ADDRESS, dd->pci_rom);
389 ret = pcie_capability_write_word(dd->pcidev, PCI_EXP_DEVCTL,
394 ret = pcie_capability_write_word(dd->pcidev, PCI_EXP_LNKCTL,
399 ret = pcie_capability_write_word(dd->pcidev, PCI_EXP_DEVCTL2,
404 ret = pci_write_config_dword(dd->pcidev, PCI_CFG_MSIX0, dd->pci_msix0);
408 if (pci_find_ext_capability(dd->pcidev, PCI_EXT_CAP_ID_TPH)) {
409 ret = pci_write_config_dword(dd->pcidev, PCIE_CFG_TPH2,
417 dd_dev_err(dd, "Unable to write to PCI config\n");
421 /* Save BARs and command to rewrite after device reset */
422 int save_pci_variables(struct hfi1_devdata *dd)
426 ret = pci_read_config_dword(dd->pcidev, PCI_BASE_ADDRESS_0,
431 ret = pci_read_config_dword(dd->pcidev, PCI_BASE_ADDRESS_1,
436 ret = pci_read_config_dword(dd->pcidev, PCI_ROM_ADDRESS, &dd->pci_rom);
440 ret = pci_read_config_word(dd->pcidev, PCI_COMMAND, &dd->pci_command);
444 ret = pcie_capability_read_word(dd->pcidev, PCI_EXP_DEVCTL,
449 ret = pcie_capability_read_word(dd->pcidev, PCI_EXP_LNKCTL,
454 ret = pcie_capability_read_word(dd->pcidev, PCI_EXP_DEVCTL2,
459 ret = pci_read_config_dword(dd->pcidev, PCI_CFG_MSIX0, &dd->pci_msix0);
463 if (pci_find_ext_capability(dd->pcidev, PCI_EXT_CAP_ID_TPH)) {
464 ret = pci_read_config_dword(dd->pcidev, PCIE_CFG_TPH2,
472 dd_dev_err(dd, "Unable to read from PCI config\n");
477 * BIOS may not set PCIe bus-utilization parameters for best performance.
478 * Check and optionally adjust them to maximize our throughput.
480 static int hfi1_pcie_caps;
481 module_param_named(pcie_caps, hfi1_pcie_caps, int, S_IRUGO);
482 MODULE_PARM_DESC(pcie_caps, "Max PCIe tuning: Payload (0..3), ReadReq (4..7)");
484 uint aspm_mode = ASPM_MODE_DISABLED;
485 module_param_named(aspm, aspm_mode, uint, S_IRUGO);
486 MODULE_PARM_DESC(aspm, "PCIe ASPM: 0: disable, 1: enable, 2: dynamic");
488 static void tune_pcie_caps(struct hfi1_devdata *dd)
490 struct pci_dev *parent;
491 u16 rc_mpss, rc_mps, ep_mpss, ep_mps;
492 u16 rc_mrrs, ep_mrrs, max_mrrs, ectl;
496 * Turn on extended tags in DevCtl in case the BIOS has turned it off
497 * to improve WFR SDMA bandwidth
499 ret = pcie_capability_read_word(dd->pcidev, PCI_EXP_DEVCTL, &ectl);
500 if ((!ret) && !(ectl & PCI_EXP_DEVCTL_EXT_TAG)) {
501 dd_dev_info(dd, "Enabling PCIe extended tags\n");
502 ectl |= PCI_EXP_DEVCTL_EXT_TAG;
503 ret = pcie_capability_write_word(dd->pcidev,
504 PCI_EXP_DEVCTL, ectl);
506 dd_dev_info(dd, "Unable to write to PCI config\n");
508 /* Find out supported and configured values for parent (root) */
509 parent = dd->pcidev->bus->self;
511 * The driver cannot perform the tuning if it does not have
512 * access to the upstream component.
515 dd_dev_info(dd, "Parent not found\n");
518 if (!pci_is_root_bus(parent->bus)) {
519 dd_dev_info(dd, "Parent not root\n");
522 if (!pci_is_pcie(parent)) {
523 dd_dev_info(dd, "Parent is not PCI Express capable\n");
526 if (!pci_is_pcie(dd->pcidev)) {
527 dd_dev_info(dd, "PCI device is not PCI Express capable\n");
530 rc_mpss = parent->pcie_mpss;
531 rc_mps = ffs(pcie_get_mps(parent)) - 8;
532 /* Find out supported and configured values for endpoint (us) */
533 ep_mpss = dd->pcidev->pcie_mpss;
534 ep_mps = ffs(pcie_get_mps(dd->pcidev)) - 8;
536 /* Find max payload supported by root, endpoint */
537 if (rc_mpss > ep_mpss)
540 /* If Supported greater than limit in module param, limit it */
541 if (rc_mpss > (hfi1_pcie_caps & 7))
542 rc_mpss = hfi1_pcie_caps & 7;
543 /* If less than (allowed, supported), bump root payload */
544 if (rc_mpss > rc_mps) {
546 pcie_set_mps(parent, 128 << rc_mps);
548 /* If less than (allowed, supported), bump endpoint payload */
549 if (rc_mpss > ep_mps) {
551 pcie_set_mps(dd->pcidev, 128 << ep_mps);
555 * Now the Read Request size.
556 * No field for max supported, but PCIe spec limits it to 4096,
557 * which is code '5' (log2(4096) - 7)
560 if (max_mrrs > ((hfi1_pcie_caps >> 4) & 7))
561 max_mrrs = (hfi1_pcie_caps >> 4) & 7;
563 max_mrrs = 128 << max_mrrs;
564 rc_mrrs = pcie_get_readrq(parent);
565 ep_mrrs = pcie_get_readrq(dd->pcidev);
567 if (max_mrrs > rc_mrrs) {
569 pcie_set_readrq(parent, rc_mrrs);
571 if (max_mrrs > ep_mrrs) {
573 pcie_set_readrq(dd->pcidev, ep_mrrs);
577 /* End of PCIe capability tuning */
580 * From here through hfi1_pci_err_handler definition is invoked via
581 * PCI error infrastructure, registered via pci
583 static pci_ers_result_t
584 pci_error_detected(struct pci_dev *pdev, pci_channel_state_t state)
586 struct hfi1_devdata *dd = pci_get_drvdata(pdev);
587 pci_ers_result_t ret = PCI_ERS_RESULT_RECOVERED;
590 case pci_channel_io_normal:
591 dd_dev_info(dd, "State Normal, ignoring\n");
594 case pci_channel_io_frozen:
595 dd_dev_info(dd, "State Frozen, requesting reset\n");
596 pci_disable_device(pdev);
597 ret = PCI_ERS_RESULT_NEED_RESET;
600 case pci_channel_io_perm_failure:
602 dd_dev_info(dd, "State Permanent Failure, disabling\n");
603 /* no more register accesses! */
604 dd->flags &= ~HFI1_PRESENT;
605 hfi1_disable_after_error(dd);
607 /* else early, or other problem */
608 ret = PCI_ERS_RESULT_DISCONNECT;
611 default: /* shouldn't happen */
612 dd_dev_info(dd, "HFI1 PCI errors detected (state %d)\n",
619 static pci_ers_result_t
620 pci_mmio_enabled(struct pci_dev *pdev)
623 struct hfi1_devdata *dd = pci_get_drvdata(pdev);
624 pci_ers_result_t ret = PCI_ERS_RESULT_RECOVERED;
626 if (dd && dd->pport) {
627 words = read_port_cntr(dd->pport, C_RX_WORDS, CNTR_INVALID_VL);
629 ret = PCI_ERS_RESULT_NEED_RESET;
631 "HFI1 mmio_enabled function called, read wordscntr %llx, returning %d\n",
637 static pci_ers_result_t
638 pci_slot_reset(struct pci_dev *pdev)
640 struct hfi1_devdata *dd = pci_get_drvdata(pdev);
642 dd_dev_info(dd, "HFI1 slot_reset function called, ignored\n");
643 return PCI_ERS_RESULT_CAN_RECOVER;
647 pci_resume(struct pci_dev *pdev)
649 struct hfi1_devdata *dd = pci_get_drvdata(pdev);
651 dd_dev_info(dd, "HFI1 resume function called\n");
652 pci_cleanup_aer_uncorrect_error_status(pdev);
654 * Running jobs will fail, since it's asynchronous
655 * unlike sysfs-requested reset. Better than
658 hfi1_init(dd, 1); /* same as re-init after reset */
661 const struct pci_error_handlers hfi1_pci_err_handler = {
662 .error_detected = pci_error_detected,
663 .mmio_enabled = pci_mmio_enabled,
664 .slot_reset = pci_slot_reset,
665 .resume = pci_resume,
668 /*============================================================================*/
669 /* PCIe Gen3 support */
672 * This code is separated out because it is expected to be removed in the
673 * final shipping product. If not, then it will be revisited and items
674 * will be moved to more standard locations.
677 /* ASIC_PCI_SD_HOST_STATUS.FW_DNLD_STS field values */
678 #define DL_STATUS_HFI0 0x1 /* hfi0 firmware download complete */
679 #define DL_STATUS_HFI1 0x2 /* hfi1 firmware download complete */
680 #define DL_STATUS_BOTH 0x3 /* hfi0 and hfi1 firmware download complete */
682 /* ASIC_PCI_SD_HOST_STATUS.FW_DNLD_ERR field values */
683 #define DL_ERR_NONE 0x0 /* no error */
684 #define DL_ERR_SWAP_PARITY 0x1 /* parity error in SerDes interrupt */
685 /* or response data */
686 #define DL_ERR_DISABLED 0x2 /* hfi disabled */
687 #define DL_ERR_SECURITY 0x3 /* security check failed */
688 #define DL_ERR_SBUS 0x4 /* SBus status error */
689 #define DL_ERR_XFR_PARITY 0x5 /* parity error during ROM transfer*/
691 /* gasket block secondary bus reset delay */
692 #define SBR_DELAY_US 200000 /* 200ms */
694 /* mask for PCIe capability register lnkctl2 target link speed */
695 #define LNKCTL2_TARGET_LINK_SPEED_MASK 0xf
697 static uint pcie_target = 3;
698 module_param(pcie_target, uint, S_IRUGO);
699 MODULE_PARM_DESC(pcie_target, "PCIe target speed (0 skip, 1-3 Gen1-3)");
701 static uint pcie_force;
702 module_param(pcie_force, uint, S_IRUGO);
703 MODULE_PARM_DESC(pcie_force, "Force driver to do a PCIe firmware download even if already at target speed");
705 static uint pcie_retry = 5;
706 module_param(pcie_retry, uint, S_IRUGO);
707 MODULE_PARM_DESC(pcie_retry, "Driver will try this many times to reach requested speed");
709 #define UNSET_PSET 255
710 #define DEFAULT_DISCRETE_PSET 2 /* discrete HFI */
711 #define DEFAULT_MCP_PSET 6 /* MCP HFI */
712 static uint pcie_pset = UNSET_PSET;
713 module_param(pcie_pset, uint, S_IRUGO);
714 MODULE_PARM_DESC(pcie_pset, "PCIe Eq Pset value to use, range is 0-10");
716 static uint pcie_ctle = 3; /* discrete on, integrated on */
717 module_param(pcie_ctle, uint, S_IRUGO);
718 MODULE_PARM_DESC(pcie_ctle, "PCIe static CTLE mode, bit 0 - discrete on/off, bit 1 - integrated on/off");
720 /* equalization columns */
725 /* discrete silicon preliminary equalization values */
726 static const u8 discrete_preliminary_eq[11][3] = {
728 { 0x00, 0x00, 0x12 }, /* p0 */
729 { 0x00, 0x00, 0x0c }, /* p1 */
730 { 0x00, 0x00, 0x0f }, /* p2 */
731 { 0x00, 0x00, 0x09 }, /* p3 */
732 { 0x00, 0x00, 0x00 }, /* p4 */
733 { 0x06, 0x00, 0x00 }, /* p5 */
734 { 0x09, 0x00, 0x00 }, /* p6 */
735 { 0x06, 0x00, 0x0f }, /* p7 */
736 { 0x09, 0x00, 0x09 }, /* p8 */
737 { 0x0c, 0x00, 0x00 }, /* p9 */
738 { 0x00, 0x00, 0x18 }, /* p10 */
741 /* integrated silicon preliminary equalization values */
742 static const u8 integrated_preliminary_eq[11][3] = {
744 { 0x00, 0x1e, 0x07 }, /* p0 */
745 { 0x00, 0x1e, 0x05 }, /* p1 */
746 { 0x00, 0x1e, 0x06 }, /* p2 */
747 { 0x00, 0x1e, 0x04 }, /* p3 */
748 { 0x00, 0x1e, 0x00 }, /* p4 */
749 { 0x03, 0x1e, 0x00 }, /* p5 */
750 { 0x04, 0x1e, 0x00 }, /* p6 */
751 { 0x03, 0x1e, 0x06 }, /* p7 */
752 { 0x03, 0x1e, 0x04 }, /* p8 */
753 { 0x05, 0x1e, 0x00 }, /* p9 */
754 { 0x00, 0x1e, 0x0a }, /* p10 */
757 static const u8 discrete_ctle_tunings[11][4] = {
759 { 0x48, 0x0b, 0x04, 0x04 }, /* p0 */
760 { 0x60, 0x05, 0x0f, 0x0a }, /* p1 */
761 { 0x50, 0x09, 0x06, 0x06 }, /* p2 */
762 { 0x68, 0x05, 0x0f, 0x0a }, /* p3 */
763 { 0x80, 0x05, 0x0f, 0x0a }, /* p4 */
764 { 0x70, 0x05, 0x0f, 0x0a }, /* p5 */
765 { 0x68, 0x05, 0x0f, 0x0a }, /* p6 */
766 { 0x38, 0x0f, 0x00, 0x00 }, /* p7 */
767 { 0x48, 0x09, 0x06, 0x06 }, /* p8 */
768 { 0x60, 0x05, 0x0f, 0x0a }, /* p9 */
769 { 0x38, 0x0f, 0x00, 0x00 }, /* p10 */
772 static const u8 integrated_ctle_tunings[11][4] = {
774 { 0x38, 0x0f, 0x00, 0x00 }, /* p0 */
775 { 0x38, 0x0f, 0x00, 0x00 }, /* p1 */
776 { 0x38, 0x0f, 0x00, 0x00 }, /* p2 */
777 { 0x38, 0x0f, 0x00, 0x00 }, /* p3 */
778 { 0x58, 0x0a, 0x05, 0x05 }, /* p4 */
779 { 0x48, 0x0a, 0x05, 0x05 }, /* p5 */
780 { 0x40, 0x0a, 0x05, 0x05 }, /* p6 */
781 { 0x38, 0x0f, 0x00, 0x00 }, /* p7 */
782 { 0x38, 0x0f, 0x00, 0x00 }, /* p8 */
783 { 0x38, 0x09, 0x06, 0x06 }, /* p9 */
784 { 0x38, 0x0e, 0x01, 0x01 }, /* p10 */
787 /* helper to format the value to write to hardware */
788 #define eq_value(pre, curr, post) \
790 PCIE_CFG_REG_PL102_GEN3_EQ_PRE_CURSOR_PSET_SHIFT) \
791 | (((u32)(curr)) << PCIE_CFG_REG_PL102_GEN3_EQ_CURSOR_PSET_SHIFT) \
792 | (((u32)(post)) << \
793 PCIE_CFG_REG_PL102_GEN3_EQ_POST_CURSOR_PSET_SHIFT))
796 * Load the given EQ preset table into the PCIe hardware.
798 static int load_eq_table(struct hfi1_devdata *dd, const u8 eq[11][3], u8 fs,
801 struct pci_dev *pdev = dd->pcidev;
805 u8 c_minus1, c0, c_plus1;
808 for (i = 0; i < 11; i++) {
810 pci_write_config_dword(pdev, PCIE_CFG_REG_PL103, i);
811 /* write the value */
812 c_minus1 = eq[i][PREC] / div;
813 c0 = fs - (eq[i][PREC] / div) - (eq[i][POST] / div);
814 c_plus1 = eq[i][POST] / div;
815 pci_write_config_dword(pdev, PCIE_CFG_REG_PL102,
816 eq_value(c_minus1, c0, c_plus1));
817 /* check if these coefficients violate EQ rules */
818 ret = pci_read_config_dword(dd->pcidev,
819 PCIE_CFG_REG_PL105, &violation);
821 dd_dev_err(dd, "Unable to read from PCI config\n");
827 & PCIE_CFG_REG_PL105_GEN3_EQ_VIOLATE_COEF_RULES_SMASK){
828 if (hit_error == 0) {
830 "Gen3 EQ Table Coefficient rule violations\n");
831 dd_dev_err(dd, " prec attn post\n");
833 dd_dev_err(dd, " p%02d: %02x %02x %02x\n",
834 i, (u32)eq[i][0], (u32)eq[i][1],
836 dd_dev_err(dd, " %02x %02x %02x\n",
837 (u32)c_minus1, (u32)c0, (u32)c_plus1);
847 * Steps to be done after the PCIe firmware is downloaded and
848 * before the SBR for the Pcie Gen3.
849 * The SBus resource is already being held.
851 static void pcie_post_steps(struct hfi1_devdata *dd)
855 set_sbus_fast_mode(dd);
857 * Write to the PCIe PCSes to set the G3_LOCKED_NEXT bits to 1.
858 * This avoids a spurious framing error that can otherwise be
859 * generated by the MAC layer.
861 * Use individual addresses since no broadcast is set up.
863 for (i = 0; i < NUM_PCIE_SERDES; i++) {
864 sbus_request(dd, pcie_pcs_addrs[dd->hfi1_id][i],
865 0x03, WRITE_SBUS_RECEIVER, 0x00022132);
868 clear_sbus_fast_mode(dd);
872 * Trigger a secondary bus reset (SBR) on ourselves using our parent.
874 * Based on pci_parent_bus_reset() which is not exported by the
877 static int trigger_sbr(struct hfi1_devdata *dd)
879 struct pci_dev *dev = dd->pcidev;
880 struct pci_dev *pdev;
883 if (!dev->bus->self) {
884 dd_dev_err(dd, "%s: no parent device\n", __func__);
888 /* should not be anyone else on the bus */
889 list_for_each_entry(pdev, &dev->bus->devices, bus_list)
892 "%s: another device is on the same bus\n",
898 * A secondary bus reset (SBR) issues a hot reset to our device.
899 * The following routine does a 1s wait after the reset is dropped
900 * per PCI Trhfa (recovery time). PCIe 3.0 section 6.6.1 -
901 * Conventional Reset, paragraph 3, line 35 also says that a 1s
902 * delay after a reset is required. Per spec requirements,
903 * the link is either working or not after that point.
905 pci_reset_bridge_secondary_bus(dev->bus->self);
911 * Write the given gasket interrupt register.
913 static void write_gasket_interrupt(struct hfi1_devdata *dd, int index,
916 write_csr(dd, ASIC_PCIE_SD_INTRPT_LIST + (index * 8),
917 (((u64)code << ASIC_PCIE_SD_INTRPT_LIST_INTRPT_CODE_SHIFT) |
918 ((u64)data << ASIC_PCIE_SD_INTRPT_LIST_INTRPT_DATA_SHIFT)));
922 * Tell the gasket logic how to react to the reset.
924 static void arm_gasket_logic(struct hfi1_devdata *dd)
928 reg = (((u64)1 << dd->hfi1_id) <<
929 ASIC_PCIE_SD_HOST_CMD_INTRPT_CMD_SHIFT) |
930 ((u64)pcie_serdes_broadcast[dd->hfi1_id] <<
931 ASIC_PCIE_SD_HOST_CMD_SBUS_RCVR_ADDR_SHIFT |
932 ASIC_PCIE_SD_HOST_CMD_SBR_MODE_SMASK |
933 ((u64)SBR_DELAY_US & ASIC_PCIE_SD_HOST_CMD_TIMER_MASK) <<
934 ASIC_PCIE_SD_HOST_CMD_TIMER_SHIFT);
935 write_csr(dd, ASIC_PCIE_SD_HOST_CMD, reg);
936 /* read back to push the write */
937 read_csr(dd, ASIC_PCIE_SD_HOST_CMD);
941 * CCE_PCIE_CTRL long name helpers
942 * We redefine these shorter macros to use in the code while leaving
943 * chip_registers.h to be autogenerated from the hardware spec.
945 #define LANE_BUNDLE_MASK CCE_PCIE_CTRL_PCIE_LANE_BUNDLE_MASK
946 #define LANE_BUNDLE_SHIFT CCE_PCIE_CTRL_PCIE_LANE_BUNDLE_SHIFT
947 #define LANE_DELAY_MASK CCE_PCIE_CTRL_PCIE_LANE_DELAY_MASK
948 #define LANE_DELAY_SHIFT CCE_PCIE_CTRL_PCIE_LANE_DELAY_SHIFT
949 #define MARGIN_OVERWRITE_ENABLE_SHIFT CCE_PCIE_CTRL_XMT_MARGIN_OVERWRITE_ENABLE_SHIFT
950 #define MARGIN_SHIFT CCE_PCIE_CTRL_XMT_MARGIN_SHIFT
951 #define MARGIN_G1_G2_OVERWRITE_MASK CCE_PCIE_CTRL_XMT_MARGIN_GEN1_GEN2_OVERWRITE_ENABLE_MASK
952 #define MARGIN_G1_G2_OVERWRITE_SHIFT CCE_PCIE_CTRL_XMT_MARGIN_GEN1_GEN2_OVERWRITE_ENABLE_SHIFT
953 #define MARGIN_GEN1_GEN2_MASK CCE_PCIE_CTRL_XMT_MARGIN_GEN1_GEN2_MASK
954 #define MARGIN_GEN1_GEN2_SHIFT CCE_PCIE_CTRL_XMT_MARGIN_GEN1_GEN2_SHIFT
957 * Write xmt_margin for full-swing (WFR-B) or half-swing (WFR-C).
959 static void write_xmt_margin(struct hfi1_devdata *dd, const char *fname)
967 pcie_ctrl = read_csr(dd, CCE_PCIE_CTRL);
970 * For Discrete, use full-swing.
971 * - PCIe TX defaults to full-swing.
972 * Leave this register as default.
973 * For Integrated, use half-swing
974 * - Copy xmt_margin and xmt_margin_oe
975 * from Gen1/Gen2 to Gen3.
977 if (dd->pcidev->device == PCI_DEVICE_ID_INTEL1) { /* integrated */
978 /* extract initial fields */
979 xmt_margin = (pcie_ctrl >> MARGIN_GEN1_GEN2_SHIFT)
980 & MARGIN_GEN1_GEN2_MASK;
981 xmt_margin_oe = (pcie_ctrl >> MARGIN_G1_G2_OVERWRITE_SHIFT)
982 & MARGIN_G1_G2_OVERWRITE_MASK;
983 lane_delay = (pcie_ctrl >> LANE_DELAY_SHIFT) & LANE_DELAY_MASK;
984 lane_bundle = (pcie_ctrl >> LANE_BUNDLE_SHIFT)
988 * For A0, EFUSE values are not set. Override with the
993 * xmt_margin and OverwiteEnabel should be the
994 * same for Gen1/Gen2 and Gen3
998 lane_delay = 0xF; /* Delay 240ns. */
999 lane_bundle = 0x0; /* Set to 1 lane. */
1002 /* overwrite existing values */
1003 pcie_ctrl = (xmt_margin << MARGIN_GEN1_GEN2_SHIFT)
1004 | (xmt_margin_oe << MARGIN_G1_G2_OVERWRITE_SHIFT)
1005 | (xmt_margin << MARGIN_SHIFT)
1006 | (xmt_margin_oe << MARGIN_OVERWRITE_ENABLE_SHIFT)
1007 | (lane_delay << LANE_DELAY_SHIFT)
1008 | (lane_bundle << LANE_BUNDLE_SHIFT);
1010 write_csr(dd, CCE_PCIE_CTRL, pcie_ctrl);
1013 dd_dev_dbg(dd, "%s: program XMT margin, CcePcieCtrl 0x%llx\n",
1018 * Do all the steps needed to transition the PCIe link to Gen3 speed.
1020 int do_pcie_gen3_transition(struct hfi1_devdata *dd)
1022 struct pci_dev *parent = dd->pcidev->bus->self;
1028 int do_retry, retry_count = 0;
1031 u16 target_vector, target_speed;
1032 u16 lnkctl2, vendor;
1035 const u8 (*ctle_tunings)[4];
1036 uint static_ctle_mode;
1037 int return_error = 0;
1039 /* PCIe Gen3 is for the ASIC only */
1040 if (dd->icode != ICODE_RTL_SILICON)
1043 if (pcie_target == 1) { /* target Gen1 */
1044 target_vector = GEN1_SPEED_VECTOR;
1045 target_speed = 2500;
1046 } else if (pcie_target == 2) { /* target Gen2 */
1047 target_vector = GEN2_SPEED_VECTOR;
1048 target_speed = 5000;
1049 } else if (pcie_target == 3) { /* target Gen3 */
1050 target_vector = GEN3_SPEED_VECTOR;
1051 target_speed = 8000;
1053 /* off or invalid target - skip */
1054 dd_dev_info(dd, "%s: Skipping PCIe transition\n", __func__);
1058 /* if already at target speed, done (unless forced) */
1059 if (dd->lbus_speed == target_speed) {
1060 dd_dev_info(dd, "%s: PCIe already at gen%d, %s\n", __func__,
1062 pcie_force ? "re-doing anyway" : "skipping");
1068 * The driver cannot do the transition if it has no access to the
1069 * upstream component
1072 dd_dev_info(dd, "%s: No upstream, Can't do gen3 transition\n",
1078 * Do the Gen3 transition. Steps are those of the PCIe Gen3
1082 /* step 1: pcie link working in gen1/gen2 */
1084 /* step 2: if either side is not capable of Gen3, done */
1085 if (pcie_target == 3 && !dd->link_gen3_capable) {
1086 dd_dev_err(dd, "The PCIe link is not Gen3 capable\n");
1091 /* hold the SBus resource across the firmware download and SBR */
1092 ret = acquire_chip_resource(dd, CR_SBUS, SBUS_TIMEOUT);
1094 dd_dev_err(dd, "%s: unable to acquire SBus resource\n",
1099 /* make sure thermal polling is not causing interrupts */
1100 therm = read_csr(dd, ASIC_CFG_THERM_POLL_EN);
1102 write_csr(dd, ASIC_CFG_THERM_POLL_EN, 0x0);
1104 dd_dev_info(dd, "%s: Disabled therm polling\n",
1109 /* the SBus download will reset the spico for thermal */
1111 /* step 3: download SBus Master firmware */
1112 /* step 4: download PCIe Gen3 SerDes firmware */
1113 dd_dev_info(dd, "%s: downloading firmware\n", __func__);
1114 ret = load_pcie_firmware(dd);
1116 /* do not proceed if the firmware cannot be downloaded */
1121 /* step 5: set up device parameter settings */
1122 dd_dev_info(dd, "%s: setting PCIe registers\n", __func__);
1125 * PcieCfgSpcie1 - Link Control 3
1126 * Leave at reset value. No need to set PerfEq - link equalization
1127 * will be performed automatically after the SBR when the target
1131 /* clear all 16 per-lane error bits (PCIe: Lane Error Status) */
1132 pci_write_config_dword(dd->pcidev, PCIE_CFG_SPCIE2, 0xffff);
1134 /* step 5a: Set Synopsys Port Logic registers */
1137 * PcieCfgRegPl2 - Port Force Link
1139 * Set the low power field to 0x10 to avoid unnecessary power
1140 * management messages. All other fields are zero.
1142 reg32 = 0x10ul << PCIE_CFG_REG_PL2_LOW_PWR_ENT_CNT_SHIFT;
1143 pci_write_config_dword(dd->pcidev, PCIE_CFG_REG_PL2, reg32);
1146 * PcieCfgRegPl100 - Gen3 Control
1148 * turn off PcieCfgRegPl100.Gen3ZRxDcNonCompl
1149 * turn on PcieCfgRegPl100.EqEieosCnt
1150 * Everything else zero.
1152 reg32 = PCIE_CFG_REG_PL100_EQ_EIEOS_CNT_SMASK;
1153 pci_write_config_dword(dd->pcidev, PCIE_CFG_REG_PL100, reg32);
1156 * PcieCfgRegPl101 - Gen3 EQ FS and LF
1157 * PcieCfgRegPl102 - Gen3 EQ Presets to Coefficients Mapping
1158 * PcieCfgRegPl103 - Gen3 EQ Preset Index
1159 * PcieCfgRegPl105 - Gen3 EQ Status
1161 * Give initial EQ settings.
1163 if (dd->pcidev->device == PCI_DEVICE_ID_INTEL0) { /* discrete */
1164 /* 1000mV, FS=24, LF = 8 */
1168 eq = discrete_preliminary_eq;
1169 default_pset = DEFAULT_DISCRETE_PSET;
1170 ctle_tunings = discrete_ctle_tunings;
1171 /* bit 0 - discrete on/off */
1172 static_ctle_mode = pcie_ctle & 0x1;
1174 /* 400mV, FS=29, LF = 9 */
1178 eq = integrated_preliminary_eq;
1179 default_pset = DEFAULT_MCP_PSET;
1180 ctle_tunings = integrated_ctle_tunings;
1181 /* bit 1 - integrated on/off */
1182 static_ctle_mode = (pcie_ctle >> 1) & 0x1;
1184 pci_write_config_dword(dd->pcidev, PCIE_CFG_REG_PL101,
1186 PCIE_CFG_REG_PL101_GEN3_EQ_LOCAL_FS_SHIFT) |
1188 PCIE_CFG_REG_PL101_GEN3_EQ_LOCAL_LF_SHIFT));
1189 ret = load_eq_table(dd, eq, fs, div);
1194 * PcieCfgRegPl106 - Gen3 EQ Control
1196 * Set Gen3EqPsetReqVec, leave other fields 0.
1198 if (pcie_pset == UNSET_PSET)
1199 pcie_pset = default_pset;
1200 if (pcie_pset > 10) { /* valid range is 0-10, inclusive */
1201 dd_dev_err(dd, "%s: Invalid Eq Pset %u, setting to %d\n",
1202 __func__, pcie_pset, default_pset);
1203 pcie_pset = default_pset;
1205 dd_dev_info(dd, "%s: using EQ Pset %u\n", __func__, pcie_pset);
1206 pci_write_config_dword(dd->pcidev, PCIE_CFG_REG_PL106,
1207 ((1 << pcie_pset) <<
1208 PCIE_CFG_REG_PL106_GEN3_EQ_PSET_REQ_VEC_SHIFT) |
1209 PCIE_CFG_REG_PL106_GEN3_EQ_EVAL2MS_DISABLE_SMASK |
1210 PCIE_CFG_REG_PL106_GEN3_EQ_PHASE23_EXIT_MODE_SMASK);
1213 * step 5b: Do post firmware download steps via SBus
1215 dd_dev_info(dd, "%s: doing pcie post steps\n", __func__);
1216 pcie_post_steps(dd);
1219 * step 5c: Program gasket interrupts
1221 /* set the Rx Bit Rate to REFCLK ratio */
1222 write_gasket_interrupt(dd, intnum++, 0x0006, 0x0050);
1223 /* disable pCal for PCIe Gen3 RX equalization */
1224 /* select adaptive or static CTLE */
1225 write_gasket_interrupt(dd, intnum++, 0x0026,
1226 0x5b01 | (static_ctle_mode << 3));
1228 * Enable iCal for PCIe Gen3 RX equalization, and set which
1229 * evaluation of RX_EQ_EVAL will launch the iCal procedure.
1231 write_gasket_interrupt(dd, intnum++, 0x0026, 0x5202);
1233 if (static_ctle_mode) {
1234 /* apply static CTLE tunings */
1235 u8 pcie_dc, pcie_lf, pcie_hf, pcie_bw;
1237 pcie_dc = ctle_tunings[pcie_pset][0];
1238 pcie_lf = ctle_tunings[pcie_pset][1];
1239 pcie_hf = ctle_tunings[pcie_pset][2];
1240 pcie_bw = ctle_tunings[pcie_pset][3];
1241 write_gasket_interrupt(dd, intnum++, 0x0026, 0x0200 | pcie_dc);
1242 write_gasket_interrupt(dd, intnum++, 0x0026, 0x0100 | pcie_lf);
1243 write_gasket_interrupt(dd, intnum++, 0x0026, 0x0000 | pcie_hf);
1244 write_gasket_interrupt(dd, intnum++, 0x0026, 0x5500 | pcie_bw);
1247 /* terminate list */
1248 write_gasket_interrupt(dd, intnum++, 0x0000, 0x0000);
1251 * step 5d: program XMT margin
1253 write_xmt_margin(dd, __func__);
1256 * step 5e: disable active state power management (ASPM). It
1257 * will be enabled if required later
1259 dd_dev_info(dd, "%s: clearing ASPM\n", __func__);
1260 aspm_hw_disable_l1(dd);
1263 * step 5f: clear DirectSpeedChange
1264 * PcieCfgRegPl67.DirectSpeedChange must be zero to prevent the
1265 * change in the speed target from starting before we are ready.
1266 * This field defaults to 0 and we are not changing it, so nothing
1270 /* step 5g: Set target link speed */
1272 * Set target link speed to be target on both device and parent.
1273 * On setting the parent: Some system BIOSs "helpfully" set the
1274 * parent target speed to Gen2 to match the ASIC's initial speed.
1275 * We can set the target Gen3 because we have already checked
1276 * that it is Gen3 capable earlier.
1278 dd_dev_info(dd, "%s: setting parent target link speed\n", __func__);
1279 ret = pcie_capability_read_word(parent, PCI_EXP_LNKCTL2, &lnkctl2);
1281 dd_dev_err(dd, "Unable to read from PCI config\n");
1286 dd_dev_info(dd, "%s: ..old link control2: 0x%x\n", __func__,
1288 /* only write to parent if target is not as high as ours */
1289 if ((lnkctl2 & LNKCTL2_TARGET_LINK_SPEED_MASK) < target_vector) {
1290 lnkctl2 &= ~LNKCTL2_TARGET_LINK_SPEED_MASK;
1291 lnkctl2 |= target_vector;
1292 dd_dev_info(dd, "%s: ..new link control2: 0x%x\n", __func__,
1294 ret = pcie_capability_write_word(parent,
1295 PCI_EXP_LNKCTL2, lnkctl2);
1297 dd_dev_err(dd, "Unable to write to PCI config\n");
1302 dd_dev_info(dd, "%s: ..target speed is OK\n", __func__);
1305 dd_dev_info(dd, "%s: setting target link speed\n", __func__);
1306 ret = pcie_capability_read_word(dd->pcidev, PCI_EXP_LNKCTL2, &lnkctl2);
1308 dd_dev_err(dd, "Unable to read from PCI config\n");
1313 dd_dev_info(dd, "%s: ..old link control2: 0x%x\n", __func__,
1315 lnkctl2 &= ~LNKCTL2_TARGET_LINK_SPEED_MASK;
1316 lnkctl2 |= target_vector;
1317 dd_dev_info(dd, "%s: ..new link control2: 0x%x\n", __func__,
1319 ret = pcie_capability_write_word(dd->pcidev, PCI_EXP_LNKCTL2, lnkctl2);
1321 dd_dev_err(dd, "Unable to write to PCI config\n");
1326 /* step 5h: arm gasket logic */
1327 /* hold DC in reset across the SBR */
1328 write_csr(dd, CCE_DC_CTRL, CCE_DC_CTRL_DC_RESET_SMASK);
1329 (void)read_csr(dd, CCE_DC_CTRL); /* DC reset hold */
1330 /* save firmware control across the SBR */
1331 fw_ctrl = read_csr(dd, MISC_CFG_FW_CTRL);
1333 dd_dev_info(dd, "%s: arming gasket logic\n", __func__);
1334 arm_gasket_logic(dd);
1337 * step 6: quiesce PCIe link
1338 * The chip has already been reset, so there will be no traffic
1339 * from the chip. Linux has no easy way to enforce that it will
1340 * not try to access the device, so we just need to hope it doesn't
1341 * do it while we are doing the reset.
1345 * step 7: initiate the secondary bus reset (SBR)
1346 * step 8: hardware brings the links back up
1347 * step 9: wait for link speed transition to be complete
1349 dd_dev_info(dd, "%s: calling trigger_sbr\n", __func__);
1350 ret = trigger_sbr(dd);
1354 /* step 10: decide what to do next */
1356 /* check if we can read PCI space */
1357 ret = pci_read_config_word(dd->pcidev, PCI_VENDOR_ID, &vendor);
1360 "%s: read of VendorID failed after SBR, err %d\n",
1365 if (vendor == 0xffff) {
1366 dd_dev_info(dd, "%s: VendorID is all 1s after SBR\n", __func__);
1372 /* restore PCI space registers we know were reset */
1373 dd_dev_info(dd, "%s: calling restore_pci_variables\n", __func__);
1374 ret = restore_pci_variables(dd);
1376 dd_dev_err(dd, "%s: Could not restore PCI variables\n",
1382 /* restore firmware control */
1383 write_csr(dd, MISC_CFG_FW_CTRL, fw_ctrl);
1386 * Check the gasket block status.
1388 * This is the first CSR read after the SBR. If the read returns
1389 * all 1s (fails), the link did not make it back.
1391 * Once we're sure we can read and write, clear the DC reset after
1392 * the SBR. Then check for any per-lane errors. Then look over
1395 reg = read_csr(dd, ASIC_PCIE_SD_HOST_STATUS);
1396 dd_dev_info(dd, "%s: gasket block status: 0x%llx\n", __func__, reg);
1397 if (reg == ~0ull) { /* PCIe read failed/timeout */
1398 dd_dev_err(dd, "SBR failed - unable to read from device\n");
1404 /* clear the DC reset */
1405 write_csr(dd, CCE_DC_CTRL, 0);
1407 /* Set the LED off */
1410 /* check for any per-lane errors */
1411 ret = pci_read_config_dword(dd->pcidev, PCIE_CFG_SPCIE2, ®32);
1413 dd_dev_err(dd, "Unable to read from PCI config\n");
1418 dd_dev_info(dd, "%s: per-lane errors: 0x%x\n", __func__, reg32);
1420 /* extract status, look for our HFI */
1421 status = (reg >> ASIC_PCIE_SD_HOST_STATUS_FW_DNLD_STS_SHIFT)
1422 & ASIC_PCIE_SD_HOST_STATUS_FW_DNLD_STS_MASK;
1423 if ((status & (1 << dd->hfi1_id)) == 0) {
1425 "%s: gasket status 0x%x, expecting 0x%x\n",
1426 __func__, status, 1 << dd->hfi1_id);
1432 err = (reg >> ASIC_PCIE_SD_HOST_STATUS_FW_DNLD_ERR_SHIFT)
1433 & ASIC_PCIE_SD_HOST_STATUS_FW_DNLD_ERR_MASK;
1435 dd_dev_err(dd, "%s: gasket error %d\n", __func__, err);
1440 /* update our link information cache */
1441 update_lbus_info(dd);
1442 dd_dev_info(dd, "%s: new speed and width: %s\n", __func__,
1445 if (dd->lbus_speed != target_speed) { /* not target */
1447 do_retry = retry_count < pcie_retry;
1448 dd_dev_err(dd, "PCIe link speed did not switch to Gen%d%s\n",
1449 pcie_target, do_retry ? ", retrying" : "");
1452 msleep(100); /* allow time to settle */
1460 write_csr(dd, ASIC_CFG_THERM_POLL_EN, 0x1);
1462 dd_dev_info(dd, "%s: Re-enable therm polling\n",
1465 release_chip_resource(dd, CR_SBUS);
1467 /* return no error if it is OK to be at current speed */
1468 if (ret && !return_error) {
1469 dd_dev_err(dd, "Proceeding at current speed PCIe speed\n");
1473 dd_dev_info(dd, "%s: done\n", __func__);