Re: [PATCH v3 2/6] usb: xhci: Set up endpoints for the first 2 interfaces
On Fri, Mar 22, 2024 at 09:17:08AM +0100, Heinrich Schuchardt wrote: > On 3/22/24 08:47, Janne Grunau via B4 Relay wrote: > > From: Janne Grunau > > > > The xhci driver currently only does the necessary initialization for > > endpoints found in the first interface descriptor. Apple USB keyboards > > (released 2021) use the second interface descriptor for the HID keyboard > > boot protocol. To allow USB drivers to use endpoints from other > > interface descriptors the xhci driver needs to ensure these endpoints > > are initialized as well. > > Use USB_MAX_ACTIVE_INTERFACES to control how many interface descriptors > > are considered during endpoint initialisation. > > For now define it to 2 as that is sufficient for supporting the Apple > > keyboards. > > > > Reviewed-by: Marek Vasut > > Reviewed-by: Neal Gompa > > Signed-off-by: Janne Grunau > > --- > > drivers/usb/host/xhci.c | 31 +++ > > include/usb.h | 6 ++ > > 2 files changed, 25 insertions(+), 12 deletions(-) > > > > diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c > > index 534c4b973f..741e186ee0 100644 > > --- a/drivers/usb/host/xhci.c > > +++ b/drivers/usb/host/xhci.c > > @@ -606,24 +606,28 @@ static int xhci_set_configuration(struct usb_device > > *udev) > > int slot_id = udev->slot_id; > > struct xhci_virt_device *virt_dev = ctrl->devs[slot_id]; > > struct usb_interface *ifdesc; > > + unsigned int ifnum; > > + unsigned int max_ifnum = min((unsigned int)USB_MAX_ACTIVE_INTERFACES, > > no_of_if being of type u8 limits the number of interfaces to 255. > Introducing USB_MAX_ACTIVE_INTERFACES limit us to the first two > interfaces. Is this really needed? Handling all interface would avoid > the introduction of artificial limitations which may hit us on the next > device. It's not strictly necessary but assume that the code was only tested with a single interface. Given the general state of u-boot's USB stack I wouldn't be surprised if it would blew up with USB descriptors maxing out the number of interfaces / endpoints. So limiting it to the minimum of what's needed to support the device in front of me looks like the safer option. Janne
Re: [PATCH v3 2/6] usb: xhci: Set up endpoints for the first 2 interfaces
On 3/22/24 08:47, Janne Grunau via B4 Relay wrote:
From: Janne Grunau
The xhci driver currently only does the necessary initialization for
endpoints found in the first interface descriptor. Apple USB keyboards
(released 2021) use the second interface descriptor for the HID keyboard
boot protocol. To allow USB drivers to use endpoints from other
interface descriptors the xhci driver needs to ensure these endpoints
are initialized as well.
Use USB_MAX_ACTIVE_INTERFACES to control how many interface descriptors
are considered during endpoint initialisation.
For now define it to 2 as that is sufficient for supporting the Apple
keyboards.
Reviewed-by: Marek Vasut
Reviewed-by: Neal Gompa
Signed-off-by: Janne Grunau
---
drivers/usb/host/xhci.c | 31 +++
include/usb.h | 6 ++
2 files changed, 25 insertions(+), 12 deletions(-)
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index 534c4b973f..741e186ee0 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -606,24 +606,28 @@ static int xhci_set_configuration(struct usb_device *udev)
int slot_id = udev->slot_id;
struct xhci_virt_device *virt_dev = ctrl->devs[slot_id];
struct usb_interface *ifdesc;
+ unsigned int ifnum;
+ unsigned int max_ifnum = min((unsigned int)USB_MAX_ACTIVE_INTERFACES,
no_of_if being of type u8 limits the number of interfaces to 255.
Introducing USB_MAX_ACTIVE_INTERFACES limit us to the first two
interfaces. Is this really needed? Handling all interface would avoid
the introduction of artificial limitations which may hit us on the next
device.
Best regards
Heinrich
+(unsigned int)udev->config.no_of_if);
out_ctx = virt_dev->out_ctx;
in_ctx = virt_dev->in_ctx;
- num_of_ep = udev->config.if_desc[0].no_of_ep;
- ifdesc = >config.if_desc[0];
-
ctrl_ctx = xhci_get_input_control_ctx(in_ctx);
/* Initialize the input context control */
ctrl_ctx->add_flags = cpu_to_le32(SLOT_FLAG);
ctrl_ctx->drop_flags = 0;
- /* EP_FLAG gives values 1 & 4 for EP1OUT and EP2IN */
- for (cur_ep = 0; cur_ep < num_of_ep; cur_ep++) {
- ep_flag = xhci_get_ep_index(>ep_desc[cur_ep]);
- ctrl_ctx->add_flags |= cpu_to_le32(1 << (ep_flag + 1));
- if (max_ep_flag < ep_flag)
- max_ep_flag = ep_flag;
+ for (ifnum = 0; ifnum < max_ifnum; ifnum++) {
+ ifdesc = >config.if_desc[ifnum];
+ num_of_ep = ifdesc->no_of_ep;
+ /* EP_FLAG gives values 1 & 4 for EP1OUT and EP2IN */
+ for (cur_ep = 0; cur_ep < num_of_ep; cur_ep++) {
+ ep_flag = xhci_get_ep_index(>ep_desc[cur_ep]);
+ ctrl_ctx->add_flags |= cpu_to_le32(1 << (ep_flag + 1));
+ if (max_ep_flag < ep_flag)
+ max_ep_flag = ep_flag;
+ }
}
xhci_inval_cache((uintptr_t)out_ctx->bytes, out_ctx->size);
@@ -637,9 +641,12 @@ static int xhci_set_configuration(struct usb_device *udev)
xhci_endpoint_copy(ctrl, in_ctx, out_ctx, 0);
/* filling up ep contexts */
- err = xhci_init_ep_contexts_if(udev, ctrl, virt_dev, ifdesc);
- if (err < 0)
- return err;
+ for (ifnum = 0; ifnum < max_ifnum; ifnum++) {
+ ifdesc = >config.if_desc[ifnum];
+ err = xhci_init_ep_contexts_if(udev, ctrl, virt_dev, ifdesc);
+ if (err < 0)
+ return err;
+ }
return xhci_configure_endpoints(udev, false);
}
diff --git a/include/usb.h b/include/usb.h
index 09e3f0cb30..3aafdc8bfd 100644
--- a/include/usb.h
+++ b/include/usb.h
@@ -49,6 +49,12 @@ extern bool usb_started; /* flag for the started/stopped USB
status */
*/
#define USB_TIMEOUT_MS(pipe) (usb_pipebulk(pipe) ? 5000 : 1000)
+/*
+ * The xhcd hcd driver prepares only a limited number interfaces / endpoints.
+ * Define this limit so that drivers do not exceed it.
+ */
+#define USB_MAX_ACTIVE_INTERFACES 2
+
/* device request (setup) */
struct devrequest {
__u8requesttype;
[PATCH v3 2/6] usb: xhci: Set up endpoints for the first 2 interfaces
From: Janne Grunau
The xhci driver currently only does the necessary initialization for
endpoints found in the first interface descriptor. Apple USB keyboards
(released 2021) use the second interface descriptor for the HID keyboard
boot protocol. To allow USB drivers to use endpoints from other
interface descriptors the xhci driver needs to ensure these endpoints
are initialized as well.
Use USB_MAX_ACTIVE_INTERFACES to control how many interface descriptors
are considered during endpoint initialisation.
For now define it to 2 as that is sufficient for supporting the Apple
keyboards.
Reviewed-by: Marek Vasut
Reviewed-by: Neal Gompa
Signed-off-by: Janne Grunau
---
drivers/usb/host/xhci.c | 31 +++
include/usb.h | 6 ++
2 files changed, 25 insertions(+), 12 deletions(-)
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index 534c4b973f..741e186ee0 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -606,24 +606,28 @@ static int xhci_set_configuration(struct usb_device *udev)
int slot_id = udev->slot_id;
struct xhci_virt_device *virt_dev = ctrl->devs[slot_id];
struct usb_interface *ifdesc;
+ unsigned int ifnum;
+ unsigned int max_ifnum = min((unsigned int)USB_MAX_ACTIVE_INTERFACES,
+(unsigned int)udev->config.no_of_if);
out_ctx = virt_dev->out_ctx;
in_ctx = virt_dev->in_ctx;
- num_of_ep = udev->config.if_desc[0].no_of_ep;
- ifdesc = >config.if_desc[0];
-
ctrl_ctx = xhci_get_input_control_ctx(in_ctx);
/* Initialize the input context control */
ctrl_ctx->add_flags = cpu_to_le32(SLOT_FLAG);
ctrl_ctx->drop_flags = 0;
- /* EP_FLAG gives values 1 & 4 for EP1OUT and EP2IN */
- for (cur_ep = 0; cur_ep < num_of_ep; cur_ep++) {
- ep_flag = xhci_get_ep_index(>ep_desc[cur_ep]);
- ctrl_ctx->add_flags |= cpu_to_le32(1 << (ep_flag + 1));
- if (max_ep_flag < ep_flag)
- max_ep_flag = ep_flag;
+ for (ifnum = 0; ifnum < max_ifnum; ifnum++) {
+ ifdesc = >config.if_desc[ifnum];
+ num_of_ep = ifdesc->no_of_ep;
+ /* EP_FLAG gives values 1 & 4 for EP1OUT and EP2IN */
+ for (cur_ep = 0; cur_ep < num_of_ep; cur_ep++) {
+ ep_flag = xhci_get_ep_index(>ep_desc[cur_ep]);
+ ctrl_ctx->add_flags |= cpu_to_le32(1 << (ep_flag + 1));
+ if (max_ep_flag < ep_flag)
+ max_ep_flag = ep_flag;
+ }
}
xhci_inval_cache((uintptr_t)out_ctx->bytes, out_ctx->size);
@@ -637,9 +641,12 @@ static int xhci_set_configuration(struct usb_device *udev)
xhci_endpoint_copy(ctrl, in_ctx, out_ctx, 0);
/* filling up ep contexts */
- err = xhci_init_ep_contexts_if(udev, ctrl, virt_dev, ifdesc);
- if (err < 0)
- return err;
+ for (ifnum = 0; ifnum < max_ifnum; ifnum++) {
+ ifdesc = >config.if_desc[ifnum];
+ err = xhci_init_ep_contexts_if(udev, ctrl, virt_dev, ifdesc);
+ if (err < 0)
+ return err;
+ }
return xhci_configure_endpoints(udev, false);
}
diff --git a/include/usb.h b/include/usb.h
index 09e3f0cb30..3aafdc8bfd 100644
--- a/include/usb.h
+++ b/include/usb.h
@@ -49,6 +49,12 @@ extern bool usb_started; /* flag for the started/stopped USB
status */
*/
#define USB_TIMEOUT_MS(pipe) (usb_pipebulk(pipe) ? 5000 : 1000)
+/*
+ * The xhcd hcd driver prepares only a limited number interfaces / endpoints.
+ * Define this limit so that drivers do not exceed it.
+ */
+#define USB_MAX_ACTIVE_INTERFACES 2
+
/* device request (setup) */
struct devrequest {
__u8requesttype;
--
2.44.0
