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Commit 7f409f15 authored by Stephen Boyd's avatar Stephen Boyd Committed by Greg Kroah-Hartman
Browse files

irqchip/gic-v3: Ignore disabled ITS nodes 



[ Upstream commit 95a2562590c2f64a0398183f978d5cf3db6d0284 ]

On some platforms there's an ITS available but it's not enabled
because reading or writing the registers is denied by the
firmware. In fact, reading or writing them will cause the system
to reset. We could remove the node from DT in such a case, but
it's better to skip nodes that are marked as "disabled" in DT so
that we can describe the hardware that exists and use the status
property to indicate how the firmware has configured things.

Cc: Stuart Yoder <stuyoder@gmail.com>
Cc: Laurentiu Tudor <laurentiu.tudor@nxp.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Rajendra Nayak <rnayak@codeaurora.org>
Signed-off-by: default avatarStephen Boyd <sboyd@codeaurora.org>
Signed-off-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
Signed-off-by: default avatarSasha Levin <alexander.levin@microsoft.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent c8723cee

drivers/irqchip/irq-gic-v3-its-pci-msi.c

+2 −0
Original line number Diff line number Diff line
@@ -133,6 +133,8 @@ static int __init its_pci_of_msi_init(void) 


	for (np = of_find_matching_node(NULL, its_device_id); np;

	     np = of_find_matching_node(np, its_device_id)) {

		if (!of_device_is_available(np))

			continue;

		if (!of_property_read_bool(np, "msi-controller"))

			continue;

drivers/irqchip/irq-gic-v3-its-platform-msi.c

+2 −0
Original line number Diff line number Diff line
@@ -80,6 +80,8 @@ static int __init its_pmsi_init(void) 


	for (np = of_find_matching_node(NULL, its_device_id); np;

	     np = of_find_matching_node(np, its_device_id)) {

		if (!of_device_is_available(np))

			continue;

		if (!of_property_read_bool(np, "msi-controller"))

			continue;

drivers/irqchip/irq-gic-v3-its.c

+2 −0
Original line number Diff line number Diff line
@@ -1807,6 +1807,8 @@ static int __init its_of_probe(struct device_node *node) 


	for (np = of_find_matching_node(node, its_device_id); np;

	     np = of_find_matching_node(np, its_device_id)) {

		if (!of_device_is_available(np))

			continue;

		if (!of_property_read_bool(np, "msi-controller")) {

			pr_warn("%s: no msi-controller property, ITS ignored\n",

				np->full_name);

drivers/staging/fsl-mc/bus/irq-gic-v3-its-fsl-mc-msi.c

+2 −0
Original line number Diff line number Diff line
@@ -75,6 +75,8 @@ int __init its_fsl_mc_msi_init(void) 


	for (np = of_find_matching_node(NULL, its_device_id); np;

	     np = of_find_matching_node(np, its_device_id)) {

		if (!of_device_is_available(np))

			continue;

		if (!of_property_read_bool(np, "msi-controller"))

			continue;