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Subject[PATCH v2 1/1] usb:xhci: update condition to select bus->sysdev from parent device
Date
From: "Thang Q. Nguyen" <tqnguyen@apm.com>

For commit 4c39d4b949d3 ("usb: xhci: use bus->sysdev for DMA
configuration"), sysdev points to devices known to the system firmware
or hardware for DMA parameters.
However, the parent of the system firmware/hardware device checking
logic does not work in ACPI boot mode. This patch updates the formulation
to check this case in both DT and ACPI.

Signed-off-by: Tung Nguyen <tunguyen@apm.com>
Signed-off-by: Thang Q. Nguyen <tqnguyen@apm.com>
---
Change since v1:
- Update codes to work with kernel 4.13-rc5
---
drivers/usb/host/xhci-plat.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
index c04144b..1bb9729 100644
--- a/drivers/usb/host/xhci-plat.c
+++ b/drivers/usb/host/xhci-plat.c
@@ -187,7 +187,10 @@ static int xhci_plat_probe(struct platform_device *pdev)
* 3. xhci_plat is grandchild of a pci device (dwc3-pci)
*/
sysdev = &pdev->dev;
- if (sysdev->parent && !sysdev->of_node && sysdev->parent->of_node)
+ if (sysdev->parent && !is_of_node(sysdev->fwnode) &&
+ !is_acpi_device_node(sysdev->fwnode) &&
+ (is_of_node(sysdev->parent->fwnode) ||
+ is_acpi_device_node(sysdev->parent->fwnode)))
sysdev = sysdev->parent;
#ifdef CONFIG_PCI
else if (sysdev->parent && sysdev->parent->parent &&
--
1.8.3.1
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