On Wed, 2020-04-01 at 14:58 -0700, Tao Ren wrote:
> Hi Ben,
>
> Any further comments on the patch?
Ah sorry, nope. Did you check the generated assembly to see if it
looked any better ? :-)
Otherwise,
Acked-by: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
>
> Cheers,
>
> Tao
>
> On Sun, Mar 15, 2020 at 12:14:30PM -0700, rentao.bupt@xxxxxxxxx
> wrote:
> > From: Tao Ren <rentao.bupt@xxxxxxxxx>
> >
> > 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@xxxxxxxxx>
> > ---
> > 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
> >
