mirror of
https://github.com/archlinuxarm/PKGBUILDs.git
synced 2024-11-08 22:45:43 +00:00
104 lines
3.9 KiB
Diff
104 lines
3.9 KiB
Diff
From 768ee4a456e28285d5f683ea70147ef595eb54d8 Mon Sep 17 00:00:00 2001
|
|
From: Johan Hovold <johan@kernel.org>
|
|
Date: Thu, 3 Aug 2017 17:52:08 +0200
|
|
Subject: [PATCH 5/5] dma-mapping: skip USB devices when configuring DMA during
|
|
probe
|
|
|
|
USB devices use the DMA mask and offset of the controller, which have
|
|
already been setup when a device is probed. Note that modifying the
|
|
DMA mask of a USB device would change the mask for the controller (and
|
|
all devices on the bus) as the mask is literally shared.
|
|
|
|
Since commit 2bf698671205 ("USB: of: fix root-hub device-tree node
|
|
handling"), of_dma_configure() would be called also for root hubs, which
|
|
use the device node of the controller. A separate, long-standing bug
|
|
that makes of_dma_configure() generate a 30-bit DMA mask from the RPI3's
|
|
"dma-ranges" would thus set a broken mask also for the controller. This
|
|
in turn prevents USB devices from enumerating when control transfers
|
|
fail:
|
|
|
|
dwc2 3f980000.usb: Cannot do DMA to address 0x000000003a166a00
|
|
|
|
Note that the aforementioned DMA-mask bug was benign for the HCD itself
|
|
as the dwc2 driver overwrites the mask previously set by
|
|
of_dma_configure() for the platform device in its probe callback. The
|
|
mask would only later get corrupted when the root-hub child device was
|
|
probed.
|
|
|
|
Fix this, and similar future problems, by adding a flag to struct device
|
|
which prevents driver core from calling dma_configure() during probe and
|
|
making sure it is set for USB devices.
|
|
|
|
Fixes: 09515ef5ddad ("of/acpi: Configure dma operations at probe time for platform/amba/pci bus devices")
|
|
Cc: stable <stable@vger.kernel.org> # 4.12
|
|
Cc: Robin Murphy <robin.murphy@arm.com>
|
|
Cc: Sricharan R <sricharan@codeaurora.org>
|
|
Cc: Stefan Wahren <stefan.wahren@i2se.com>
|
|
Reported-by: Hans Verkuil <hverkuil@xs4all.nl>
|
|
Signed-off-by: Johan Hovold <johan@kernel.org>
|
|
---
|
|
drivers/base/dma-mapping.c | 6 ++++++
|
|
drivers/usb/core/usb.c | 1 +
|
|
include/linux/device.h | 3 +++
|
|
3 files changed, 10 insertions(+)
|
|
|
|
diff --git a/drivers/base/dma-mapping.c b/drivers/base/dma-mapping.c
|
|
index b555ff9dd8fc..f9f703be0ad1 100644
|
|
--- a/drivers/base/dma-mapping.c
|
|
+++ b/drivers/base/dma-mapping.c
|
|
@@ -345,6 +345,9 @@ int dma_configure(struct device *dev)
|
|
enum dev_dma_attr attr;
|
|
int ret = 0;
|
|
|
|
+ if (dev->skip_dma_configure)
|
|
+ return 0;
|
|
+
|
|
if (dev_is_pci(dev)) {
|
|
bridge = pci_get_host_bridge_device(to_pci_dev(dev));
|
|
dma_dev = bridge;
|
|
@@ -369,6 +372,9 @@ int dma_configure(struct device *dev)
|
|
|
|
void dma_deconfigure(struct device *dev)
|
|
{
|
|
+ if (dev->skip_dma_configure)
|
|
+ return;
|
|
+
|
|
of_dma_deconfigure(dev);
|
|
acpi_dma_deconfigure(dev);
|
|
}
|
|
diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c
|
|
index 17681d5638ac..2a85d905b539 100644
|
|
--- a/drivers/usb/core/usb.c
|
|
+++ b/drivers/usb/core/usb.c
|
|
@@ -588,6 +588,7 @@ struct usb_device *usb_alloc_dev(struct usb_device *parent,
|
|
* Note: calling dma_set_mask() on a USB device would set the
|
|
* mask for the entire HCD, so don't do that.
|
|
*/
|
|
+ dev->dev.skip_dma_configure = true;
|
|
dev->dev.dma_mask = bus->sysdev->dma_mask;
|
|
dev->dev.dma_pfn_offset = bus->sysdev->dma_pfn_offset;
|
|
set_dev_node(&dev->dev, dev_to_node(bus->sysdev));
|
|
diff --git a/include/linux/device.h b/include/linux/device.h
|
|
index 723cd54b94da..022cf258068b 100644
|
|
--- a/include/linux/device.h
|
|
+++ b/include/linux/device.h
|
|
@@ -877,6 +877,8 @@ struct dev_links_info {
|
|
* @offline: Set after successful invocation of bus type's .offline().
|
|
* @of_node_reused: Set if the device-tree node is shared with an ancestor
|
|
* device.
|
|
+ * @skip_dma_configure: Set if driver core should not configure DMA for this
|
|
+ * device during probe.
|
|
*
|
|
* At the lowest level, every device in a Linux system is represented by an
|
|
* instance of struct device. The device structure contains the information
|
|
@@ -965,6 +967,7 @@ struct device {
|
|
bool offline_disabled:1;
|
|
bool offline:1;
|
|
bool of_node_reused:1;
|
|
+ bool skip_dma_configure:1;
|
|
};
|
|
|
|
static inline struct device *kobj_to_dev(struct kobject *kobj)
|
|
--
|
|
2.13.3
|
|
|