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Commit 813ce455 authored by Vivek Pernamitta's avatar Vivek Pernamitta
Browse files

msm: pcie : Extend link recovery for config space access failure 



Extend recovery mechanism for both config read and write
failures for FF's.

Change-Id: Iee22b04b5c6de83c55466d6a379a6734dea8026e
Signed-off-by: default avatarVivek Pernamitta <vpernami@codeaurora.org>
parent 566edd21

drivers/pci/controller/pci-msm.c

+14 −11
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0-only

/* Copyright (c) 2014-2020, The Linux Foundation. All rights reserved.*/

/* Copyright (c) 2014-2021, The Linux Foundation. All rights reserved.*/



#include <dt-bindings/regulator/qcom,rpmh-regulator-levels.h>

#include <linux/bitops.h>
@@ -3219,23 +3219,15 @@ static inline int msm_pcie_oper_conf(struct pci_bus *bus, u32 devfn, int oper, 


		if (dev->shadow_en) {

			if (rd_val == PCIE_LINK_DOWN &&

			   (readl_relaxed(config_base) == PCIE_LINK_DOWN)) {

			   (readl_relaxed(config_base) == PCIE_LINK_DOWN))

				PCIE_ERR(dev,

					"Read of RC%d %d:0x%02x + 0x%04x[%d] is all FFs\n",

					rc_idx, bus->number, devfn,

					where, size);

				if (dev->config_recovery) {

					PCIE_ERR(dev,

						"RC%d link recovery schedule\n",

						rc_idx);

					dev->cfg_access = false;

					schedule_work(&dev->link_recover_wq);

				}

			} else {

			else

				msm_pcie_save_shadow(dev, word_offset, wr_val,

					bdf, rc);

		}

		}



		PCIE_DBG3(dev,

			"RC%d %d:0x%02x + 0x%04x[%d] <- 0x%08x; rd 0x%08x val 0x%08x\n",
@@ -3243,6 +3235,17 @@ static inline int msm_pcie_oper_conf(struct pci_bus *bus, u32 devfn, int oper, 
			wr_val, rd_val, *val);

	}



	if (rd_val == PCIE_LINK_DOWN &&

	   (readl_relaxed(config_base) == PCIE_LINK_DOWN)) {

		if (dev->config_recovery) {

			PCIE_ERR(dev,

				"RC%d link recovery schedule\n",

				rc_idx);

			dev->cfg_access = false;

			schedule_work(&dev->link_recover_wq);

		}

	}



unlock:

	spin_unlock_irqrestore(&dev->cfg_lock, dev->irqsave_flags);

out: