@@ -14,6 +14,7 @@
#include <linux/pci.h>
#include <linux/of.h>
#include <linux/of_device.h>
+#include <linux/of_reserved_mem.h>
#include <linux/platform_device.h>
#include <linux/usb/phy.h>
#include <linux/slab.h>
@@ -149,7 +150,7 @@ int xhci_plat_probe(struct platform_device *pdev, struct device *sysdev, const s
struct xhci_hcd *xhci;
struct resource *res;
struct usb_hcd *hcd, *usb3_hcd;
- int ret;
+ int i, count, ret;
int irq;
struct xhci_plat_priv *priv = NULL;
bool of_match;
@@ -194,6 +195,19 @@ int xhci_plat_probe(struct platform_device *pdev, struct device *sysdev, const s
xhci->allow_single_roothub = 1;
+ count = of_property_count_u32_elems(sysdev->of_node, "memory-region");
+
+ for (i = 0; i < count; i++) {
+ ret = of_reserved_mem_device_init_by_idx(sysdev, sysdev->of_node, i);
+ if (ret) {
+ dev_err(sysdev, "Could not get reserved memory\n");
+ if (i > 0)
+ of_reserved_mem_device_release(sysdev);
+
+ return ret;
+ }
+ }
+
/*
* Not all platforms have clks so it is not an error if the
* clock do not exist.
@@ -431,6 +445,9 @@ void xhci_plat_remove(struct platform_device *dev)
clk_disable_unprepare(clk);
clk_disable_unprepare(reg_clk);
reset_control_assert(xhci->reset);
+
+ of_reserved_mem_device_release(hcd->self.sysdev);
+
usb_put_hcd(hcd);
pm_runtime_disable(&dev->dev);
The reason why it needs multiple regions is that in my system there is an always-on subsystem which includes a small size memory, and several functions need to run and occupy the memory from the small memory if they need to run on the always-on subsystem. These functions must allocate the memory from the small memory region, so that they can get benefit from the always-on subsystem. So the small memory is split for multiple functions which are satisfied with their generic use cases. But in specific use cases, like USB3 devices which support the stream trasnsfer or multiple devices connect to the host, they required more memory than their pre-allocated memory region, so I tried to propose this patch to give it the ability to get the memory from the other larger memory to solve the issue. Signed-off-by: Howard Yen <howardyen@google.com> --- drivers/usb/host/xhci-plat.c | 19 ++++++++++++++++++- 1 file changed, 18 insertions(+), 1 deletion(-)