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Commit 18906318 authored by Vivek Pernamitta's avatar Vivek Pernamitta
Browse files

msm: pcie: Disable masking MSI interrupts at EP 



Disable masking MSI interrupts at EP side to avoid
premeption disable on the CPU core while writing MSI
mask register.

Change-Id: I64fbb5aa8d9b21a78748b51b086506ce63a06a53
Signed-off-by: default avatarVivek Pernamitta <vpernami@codeaurora.org>
parent f64d2bf5

drivers/pci/controller/pci-msm-msi.c

+10 −3
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0-only

/* Copyright (c) 2018-2020, The Linux Foundation. All rights reserved.*/

/* Copyright (c) 2018-2021, The Linux Foundation. All rights reserved.*/



#include <linux/interrupt.h>

#include <linux/iommu.h>
@@ -63,6 +63,7 @@ struct msm_msi { 
	phys_addr_t msi_addr;

	u32 msi_addr_size;

	enum msi_type type;

	bool msi_mask_disable;

	spinlock_t cfg_lock; /* lock for configuring Synopsys MSI registers */

	bool cfg_access; /* control access to MSI registers */

	void __iomem *pcie_cfg;
@@ -162,7 +163,7 @@ static void msm_msi_mask_irq(struct irq_data *data) 
	msi = msi_irq->client->msi;



	spin_lock_irqsave(&msi->cfg_lock, flags);

	if (msi->cfg_access)

	if (!msi->msi_mask_disable && msi->cfg_access)

		pci_msi_mask_irq(data);

	spin_unlock_irqrestore(&msi->cfg_lock, flags);
@@ -213,7 +214,7 @@ static void msm_msi_unmask_irq(struct irq_data *data) 
	msi->unmask_irq(parent_data);



	spin_lock_irqsave(&msi->cfg_lock, flags);

	if (msi->cfg_access)

	if (!msi->msi_mask_disable && msi->cfg_access)

		pci_msi_unmask_irq(data);

	spin_unlock_irqrestore(&msi->cfg_lock, flags);

}
@@ -643,6 +644,12 @@ int msm_msi_init(struct device *dev) 
	mutex_init(&msi->mutex);

	spin_lock_init(&msi->cfg_lock);

	INIT_LIST_HEAD(&msi->clients);

	msi->msi_mask_disable = of_property_read_bool(dev->of_node,

						"qcom,msi_mask_disable");



	if (msi->msi_mask_disable)

		pr_warn("MSI interrupts mask disabled:%d\n",

				msi->msi_mask_disable);



	prop_val = of_get_address(msi->of_node, 0, NULL, NULL);

	if (!prop_val) {