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Commit cc675921 authored by Tony Truong's avatar Tony Truong
Browse files

msm: msi: set enable_irq_wake for PCIe MSI IRQ 



To guarantee PCIe client MSI can wake up APPS while its in LPM,
call enable_irq_wake on the parent MSI, PCIe MSI IRQ. Doing so
will make sure these IRQs are not disabled as part of APPS system
suspend.

Change-Id: Ifdb74068a26eca7028667310d62df8b974e58927
Signed-off-by: default avatarTony Truong <truong@codeaurora.org>
parent eca62752

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

+23 −1
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>
@@ -480,6 +480,14 @@ static int msm_msi_snps_irq_setup(struct msm_msi *msi) 
			goto free_irqs;

		}



		ret = enable_irq_wake(irq);

		if (ret) {

			dev_err(msi->dev,

				"MSI: Unable to set enable_irq_wake for interrupt: %d: %d\n",

				i, irq);

			goto free_irq;

		}



		msi_grp = &msi->grps[i];

		msi_grp->int_en_reg = msi->pcie_cfg +

				PCIE_MSI_CTRL_INT_N_EN_OFFS(i);
@@ -503,11 +511,14 @@ static int msm_msi_snps_irq_setup(struct msm_msi *msi) 


	return 0;



free_irq:

	irq_dispose_mapping(irq);

free_irqs:

	for (--i; i >= 0; i--) {

		irq = msi->grps[i].irqs[0].hwirq;



		irq_set_chained_handler_and_data(irq, NULL, NULL);

		disable_irq_wake(irq);

		irq_dispose_mapping(irq);

	}
@@ -531,6 +542,14 @@ static int msm_msi_qgic_irq_setup(struct msm_msi *msi) 
			goto free_irqs;

		}



		ret = enable_irq_wake(irq);

		if (ret) {

			dev_err(msi->dev,

				"MSI: Unable to set enable_irq_wake for interrupt: %d: %d\n",

				i, irq);

			goto free_irq;

		}



		grp = i / MSI_IRQ_PER_GRP;

		index = i % MSI_IRQ_PER_GRP;

		msi_grp = &msi->grps[grp];
@@ -547,6 +566,8 @@ static int msm_msi_qgic_irq_setup(struct msm_msi *msi) 


	return 0;



free_irq:

	irq_dispose_mapping(irq);

free_irqs:

	for (--i; i >= 0; i--) {

		grp = i / MSI_IRQ_PER_GRP;
@@ -554,6 +575,7 @@ static int msm_msi_qgic_irq_setup(struct msm_msi *msi) 
		irq = msi->grps[grp].irqs[index].hwirq;



		irq_set_chained_handler_and_data(irq, NULL, NULL);

		disable_irq_wake(irq);

		irq_dispose_mapping(irq);

	}