On r8a7791/koelsch and shmobile_defconfig, PCIe probing fails with:
rcar-pcie fe000000.pcie: Adjusted size 0x0 invalid
rcar-pcie: probe of fe000000.pcie failed with error -22
of_dma_get_range() returns the following map:
cpu_start 0x40000000 dma_start 0x40000000 size 0x080000000 offset 0
cpu_start 0x00000000 dma_start 0x00000000 size 0x100000000 offset 0
If CONFIG_ARM_LPAE=n, dma_addr_t is 32-bit. Hence when assigning
r->dma_start + r->size to dma_end, this value will be truncated to
32-bit, yielding zero when processing the second table entry.
Consequently, both dma_start and dma_end will be zero, leading to a zero
size.
Fix this by changing the dma_start and dma_end variables from dma_addr_t
to u64.
Fixes: e0d072782c734d27 ("dma-mapping: introduce DMA range map, supplanting
dma_pfn_offset")
Signed-off-by: Geert Uytterhoeven <geert+rene...@glider.be>
---
drivers/of/device.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/of/device.c b/drivers/of/device.c
index 655dee422563f05f..3a469c79e6b05de4 100644
--- a/drivers/of/device.c
+++ b/drivers/of/device.c
@@ -93,7 +93,7 @@ int of_dma_configure_id(struct device *dev, struct
device_node *np,
{
const struct iommu_ops *iommu;
const struct bus_dma_region *map = NULL;
- dma_addr_t dma_start = 0;
+ u64 dma_start = 0;
u64 mask, end, size = 0;
bool coherent;
int ret;
@@ -109,10 +109,10 @@ int of_dma_configure_id(struct device *dev, struct
device_node *np,
return ret == -ENODEV ? 0 : ret;
} else {
const struct bus_dma_region *r = map;
- dma_addr_t dma_end = 0;
+ u64 dma_end = 0;
/* Determine the overall bounds of all DMA regions */
- for (dma_start = ~(dma_addr_t)0; r->size; r++) {
+ for (dma_start = ~0ULL; r->size; r++) {
/* Take lower and upper limits */
if (r->dma_start < dma_start)
dma_start = r->dma_start;
--
2.25.1
