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dm: usb: Add support for interrupt queues to the dm usb code

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Interrupt endpoints typically are polled for a long time by the usb
controller before they return anything, so calls to submit_int_msg() can
take a long time to complete this.

To avoid this the u-boot code has the an interrupt queue mechanism / API,
add support for this to the driver-model usb code and implement it for the
dm ehci code.

See the added doc comments for more details.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Hans de Goede
2015-05-10 14:10:18 +02:00
committed by Simon Glass
parent 029fd8ea1f
commit 8a5f0665da
3 changed files with 109 additions and 1 deletions
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include/usb.h
+47 -1
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@@ -198,7 +198,7 @@ int submit_control_msg(struct usb_device *dev, unsigned long pipe, void *buffer,
int submit_int_msg(struct usb_device *dev, unsigned long pipe, void *buffer,
int transfer_len, int interval);
#if defined CONFIG_USB_EHCI || defined CONFIG_MUSB_HOST
#if defined CONFIG_USB_EHCI || defined CONFIG_MUSB_HOST || defined(CONFIG_DM_USB)
struct int_queue *create_int_queue(struct usb_device *dev, unsigned long pipe,
int queuesize, int elementsize, void *buffer, int interval);
int destroy_int_queue(struct usb_device *dev, struct int_queue *queue);
@@ -660,6 +660,52 @@ struct dm_usb_ops {
int (*interrupt)(struct udevice *bus, struct usb_device *udev,
unsigned long pipe, void *buffer, int length,
int interval);
/**
* create_int_queue() - Create and queue interrupt packets
*
* Create and queue @queuesize number of interrupt usb packets of
* @elementsize bytes each. @buffer must be atleast @queuesize *
* @elementsize bytes.
*
* Note some controllers only support a queuesize of 1.
*
* @interval: Interrupt interval
*
* @return A pointer to the created interrupt queue or NULL on error
*/
struct int_queue * (*create_int_queue)(struct udevice *bus,
struct usb_device *udev, unsigned long pipe,
int queuesize, int elementsize, void *buffer,
int interval);
/**
* poll_int_queue() - Poll an interrupt queue for completed packets
*
* Poll an interrupt queue for completed packets. The return value
* points to the part of the buffer passed to create_int_queue()
* corresponding to the completed packet.
*
* @queue: queue to poll
*
* @return Pointer to the data of the first completed packet, or
* NULL if no packets are ready
*/
void * (*poll_int_queue)(struct udevice *bus, struct usb_device *udev,
struct int_queue *queue);
/**
* destroy_int_queue() - Destroy an interrupt queue
*
* Destroy an interrupt queue created by create_int_queue().
*
* @queue: queue to poll
*
* @return 0 if OK, -ve on error
*/
int (*destroy_int_queue)(struct udevice *bus, struct usb_device *udev,
struct int_queue *queue);
/**
* alloc_device() - Allocate a new device context (XHCI)
*