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pci: pci-msm-msi: Update the msi address size

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Some targets need to set the MSI address size same as the
PCIe data size(bytes) that PCIe core will halt for each write
transaction. Hence add a property to pass the exponent (base 2)
value for the size. Not setting this value same as PCIe core
write halt size results into a deadlock on system bus.

Change-Id: Ic94bb9330ac0a78ab273991d786fa2233f9383a6
Signed-off-by: Hemant Kumar <hemantk@codeaurora.org>
This commit is contained in:
Hemant Kumar 2020-07-16 15:01:19 -07:00
commit ee19c29dea
1 changed files with 9 additions and 1 deletions
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10
drivers/pci/controller/pci-msm-msi.c
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@ -28,6 +28,7 @@ struct msm_msi {
struct irq_domain *inner_domain; /* parent domain; gen irq related */
struct irq_domain *msi_domain; /* child domain; pci related */
phys_addr_t msi_addr;
u32 msi_addr_size;
};
/* structure for each client of MSI controller */
@ -106,7 +107,7 @@ static int msm_msi_domain_prepare(struct irq_domain *domain, struct device *dev,
client->msi = msi;
client->dev = dev;
client->msi_addr = dma_map_resource(client->dev, msi->msi_addr,
PAGE_SIZE, DMA_FROM_DEVICE, 0);
msi->msi_addr_size, DMA_FROM_DEVICE, 0);
if (dma_mapping_error(client->dev, client->msi_addr)) {
dev_err(msi->dev, "MSI: failed to map msi address\n");
client->msi_addr = 0;
@ -322,6 +323,7 @@ int msm_msi_init(struct device *dev)
struct device_node *of_node;
const __be32 *prop_val;
struct of_phandle_args irq;
u32 size_exp = 0;
if (!dev->of_node) {
dev_err(dev, "MSI: missing DT node\n");
@ -370,6 +372,12 @@ int msm_msi_init(struct device *dev)
goto err;
}
of_property_read_u32(of_node, "qcom,msi-addr-size-exp", &size_exp);
size_exp = (size_exp > PAGE_SHIFT) ? size_exp : PAGE_SHIFT;
msi->msi_addr_size = 1 << size_exp;
while (of_irq_parse_one(msi->of_node, msi->nr_irqs, &irq) == 0)
msi->nr_irqs++;