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misc: pci_endpoint_test: Enable/Disable MSI using module param 

In certain platforms like TI's DRA7 SoCs, use of legacy PCI interrupt is
exclusive with use of MSI (Section 24.9.4.6.2.1 Legacy PCI Interrupts in
http://www.ti.com/lit/ug/spruhz6i/spruhz6i.pdf).

However pci_endpoint_test driver enables MSI by default in probe.  In order
for pci_endpoint_test to be able to test legacy interrupt, MSI should be
disabled. Add a module param 'no_msi' to disable MSI (only when legacy
interrupt has to be tested).

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
[bhelgaas: folded in static fix from Colin Ian King <colin.king@canonical.com>]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Kishon Vijay Abraham I 2017-08-18 20:28:09 +05:30 committed by Bjorn Helgaas
parent cda370ec6d
commit 0c8a5f9d89
1 changed files with 5 additions and 1 deletions
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6
drivers/misc/pci_endpoint_test.c
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@ -72,6 +72,11 @@ static DEFINE_IDA(pci_endpoint_test_ida);
#define to_endpoint_test(priv) container_of((priv), struct pci_endpoint_test, \
miscdev)
static bool no_msi;
module_param(no_msi, bool, 0444);
MODULE_PARM_DESC(no_msi, "Disable MSI interrupt in pci_endpoint_test");
enum pci_barno {
BAR_0,
BAR_1,
@ -451,7 +456,6 @@ static int pci_endpoint_test_probe(struct pci_dev *pdev,
int err;
int irq = 0;
int id;
bool no_msi = false;
char name[20];
enum pci_barno bar;
void __iomem *base;