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Subject[PATCH v3] usb: gadget: aspeed: improve vhub port irq handling
Date
From: Tao Ren <rentao.bupt@gmail.com>

This patch evaluates vhub ports' irq mask before going through per-port
irq handling one by one, which helps to speed up irq handling in case
there is no port interrupt.

Signed-off-by: Tao Ren <rentao.bupt@gmail.com>
---
Changes in v3:
- assign istat to (unsigned long) bitmap before calling
"for_each_set_bit_from".
Changes in v2:
- use "for_each_set_bit" to speed up port irq handling.

drivers/usb/gadget/udc/aspeed-vhub/core.c | 12 +++++++++---
drivers/usb/gadget/udc/aspeed-vhub/vhub.h | 8 +++-----
2 files changed, 12 insertions(+), 8 deletions(-)

diff --git a/drivers/usb/gadget/udc/aspeed-vhub/core.c b/drivers/usb/gadget/udc/aspeed-vhub/core.c
index f8d35dd60c34..555e8645fb1e 100644
--- a/drivers/usb/gadget/udc/aspeed-vhub/core.c
+++ b/drivers/usb/gadget/udc/aspeed-vhub/core.c
@@ -134,11 +134,15 @@ static irqreturn_t ast_vhub_irq(int irq, void *data)
}

/* Handle device interrupts */
- for (i = 0; i < vhub->max_ports; i++) {
- u32 dev_mask = VHUB_IRQ_DEVICE1 << i;
+ if (istat & vhub->port_irq_mask) {
+ unsigned long bitmap = istat;
+ int offset = VHUB_IRQ_DEV1_BIT;
+ int size = VHUB_IRQ_DEV1_BIT + vhub->max_ports;

- if (istat & dev_mask)
+ for_each_set_bit_from(offset, &bitmap, size) {
+ i = offset - VHUB_IRQ_DEV1_BIT;
ast_vhub_dev_irq(&vhub->ports[i].dev);
+ }
}

/* Handle top-level vHub EP0 interrupts */
@@ -332,6 +336,8 @@ static int ast_vhub_probe(struct platform_device *pdev)

spin_lock_init(&vhub->lock);
vhub->pdev = pdev;
+ vhub->port_irq_mask = GENMASK(VHUB_IRQ_DEV1_BIT + vhub->max_ports - 1,
+ VHUB_IRQ_DEV1_BIT);

res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
vhub->regs = devm_ioremap_resource(&pdev->dev, res);
diff --git a/drivers/usb/gadget/udc/aspeed-vhub/vhub.h b/drivers/usb/gadget/udc/aspeed-vhub/vhub.h
index fac79ef6d669..23a1ac91f8d2 100644
--- a/drivers/usb/gadget/udc/aspeed-vhub/vhub.h
+++ b/drivers/usb/gadget/udc/aspeed-vhub/vhub.h
@@ -51,14 +51,11 @@
#define VHUB_CTRL_UPSTREAM_CONNECT (1 << 0)

/* IER & ISR */
+#define VHUB_IRQ_DEV1_BIT 9
#define VHUB_IRQ_USB_CMD_DEADLOCK (1 << 18)
#define VHUB_IRQ_EP_POOL_NAK (1 << 17)
#define VHUB_IRQ_EP_POOL_ACK_STALL (1 << 16)
-#define VHUB_IRQ_DEVICE5 (1 << 13)
-#define VHUB_IRQ_DEVICE4 (1 << 12)
-#define VHUB_IRQ_DEVICE3 (1 << 11)
-#define VHUB_IRQ_DEVICE2 (1 << 10)
-#define VHUB_IRQ_DEVICE1 (1 << 9)
+#define VHUB_IRQ_DEVICE1 (1 << (VHUB_IRQ_DEV1_BIT))
#define VHUB_IRQ_BUS_RESUME (1 << 8)
#define VHUB_IRQ_BUS_SUSPEND (1 << 7)
#define VHUB_IRQ_BUS_RESET (1 << 6)
@@ -402,6 +399,7 @@ struct ast_vhub {
/* Per-port info */
struct ast_vhub_port *ports;
u32 max_ports;
+ u32 port_irq_mask;

/* Generic EP data structures */
struct ast_vhub_ep *epns;
--
2.17.1
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