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SubjectRe: [PATCH v2 1/5] usb: gadget: aspeed: read vhub properties f rom device tree


On Thu, 13 Feb 2020, at 08:27, rentao.bupt@gmail.com wrote:
> From: Tao Ren <rentao.bupt@gmail.com>
>
> The patch introduces 2 DT properties ("aspeed,vhub-downstream-ports" and
> "aspeed,vhub-generic-endpoints") which replaces hardcoded port/endpoint
> number. It is to make it more convenient to add support for newer vhub
> revisions with different number of ports and endpoints.
>
> Signed-off-by: Tao Ren <rentao.bupt@gmail.com>
> Reviewed-by: Joel Stanley <joel@jms.id.au>
> ---
> Changes in v2:
> - removed ast_vhub_config structure and moved vhub port/endpoint
> number into device tree.
>
> drivers/usb/gadget/udc/aspeed-vhub/core.c | 68 ++++++++++++++---------
> drivers/usb/gadget/udc/aspeed-vhub/dev.c | 30 +++++++---
> drivers/usb/gadget/udc/aspeed-vhub/epn.c | 4 +-
> drivers/usb/gadget/udc/aspeed-vhub/hub.c | 26 ++++++---
> drivers/usb/gadget/udc/aspeed-vhub/vhub.h | 23 +++-----
> 5 files changed, 91 insertions(+), 60 deletions(-)
>
> diff --git a/drivers/usb/gadget/udc/aspeed-vhub/core.c
> b/drivers/usb/gadget/udc/aspeed-vhub/core.c
> index 90b134d5dca9..d6f737fac4e2 100644
> --- a/drivers/usb/gadget/udc/aspeed-vhub/core.c
> +++ b/drivers/usb/gadget/udc/aspeed-vhub/core.c
> @@ -99,7 +99,7 @@ static irqreturn_t ast_vhub_irq(int irq, void *data)
> {
> struct ast_vhub *vhub = data;
> irqreturn_t iret = IRQ_NONE;
> - u32 istat;
> + u32 i, istat;
>
> /* Stale interrupt while tearing down */
> if (!vhub->ep0_bufs)
> @@ -121,10 +121,10 @@ static irqreturn_t ast_vhub_irq(int irq, void *data)
>
> /* Handle generic EPs first */
> if (istat & VHUB_IRQ_EP_POOL_ACK_STALL) {
> - u32 i, ep_acks = readl(vhub->regs + AST_VHUB_EP_ACK_ISR);
> + u32 ep_acks = readl(vhub->regs + AST_VHUB_EP_ACK_ISR);
> writel(ep_acks, vhub->regs + AST_VHUB_EP_ACK_ISR);
>
> - for (i = 0; ep_acks && i < AST_VHUB_NUM_GEN_EPs; i++) {
> + for (i = 0; ep_acks && i < vhub->max_epns; i++) {
> u32 mask = VHUB_EP_IRQ(i);
> if (ep_acks & mask) {
> ast_vhub_epn_ack_irq(&vhub->epns[i]);
> @@ -134,21 +134,11 @@ static irqreturn_t ast_vhub_irq(int irq, void *data)
> }
>
> /* Handle device interrupts */
> - if (istat & (VHUB_IRQ_DEVICE1 |
> - VHUB_IRQ_DEVICE2 |
> - VHUB_IRQ_DEVICE3 |
> - VHUB_IRQ_DEVICE4 |
> - VHUB_IRQ_DEVICE5)) {
> - if (istat & VHUB_IRQ_DEVICE1)
> - ast_vhub_dev_irq(&vhub->ports[0].dev);
> - if (istat & VHUB_IRQ_DEVICE2)
> - ast_vhub_dev_irq(&vhub->ports[1].dev);
> - if (istat & VHUB_IRQ_DEVICE3)
> - ast_vhub_dev_irq(&vhub->ports[2].dev);
> - if (istat & VHUB_IRQ_DEVICE4)
> - ast_vhub_dev_irq(&vhub->ports[3].dev);
> - if (istat & VHUB_IRQ_DEVICE5)
> - ast_vhub_dev_irq(&vhub->ports[4].dev);
> + for (i = 0; i < vhub->max_ports; i++) {
> + u32 dev_mask = VHUB_IRQ_DEVICE1 << i;
> +
> + if (istat & dev_mask)
> + ast_vhub_dev_irq(&vhub->ports[i].dev);
> }
>
> /* Handle top-level vHub EP0 interrupts */
> @@ -182,7 +172,7 @@ static irqreturn_t ast_vhub_irq(int irq, void *data)
>
> void ast_vhub_init_hw(struct ast_vhub *vhub)
> {
> - u32 ctrl;
> + u32 ctrl, port_mask, epn_mask;
>
> UDCDBG(vhub,"(Re)Starting HW ...\n");
>
> @@ -222,15 +212,20 @@ void ast_vhub_init_hw(struct ast_vhub *vhub)
> }
>
> /* Reset all devices */
> - writel(VHUB_SW_RESET_ALL, vhub->regs + AST_VHUB_SW_RESET);
> + port_mask = GENMASK(vhub->max_ports, 1);
> + writel(VHUB_SW_RESET_ROOT_HUB |
> + VHUB_SW_RESET_DMA_CONTROLLER |
> + VHUB_SW_RESET_EP_POOL |
> + port_mask, vhub->regs + AST_VHUB_SW_RESET);
> udelay(1);
> writel(0, vhub->regs + AST_VHUB_SW_RESET);
>
> /* Disable and cleanup EP ACK/NACK interrupts */
> + epn_mask = GENMASK(vhub->max_epns - 1, 0);
> writel(0, vhub->regs + AST_VHUB_EP_ACK_IER);
> writel(0, vhub->regs + AST_VHUB_EP_NACK_IER);
> - writel(VHUB_EP_IRQ_ALL, vhub->regs + AST_VHUB_EP_ACK_ISR);
> - writel(VHUB_EP_IRQ_ALL, vhub->regs + AST_VHUB_EP_NACK_ISR);
> + writel(epn_mask, vhub->regs + AST_VHUB_EP_ACK_ISR);
> + writel(epn_mask, vhub->regs + AST_VHUB_EP_NACK_ISR);
>
> /* Default settings for EP0, enable HW hub EP1 */
> writel(0, vhub->regs + AST_VHUB_EP0_CTRL);
> @@ -273,7 +268,7 @@ static int ast_vhub_remove(struct platform_device *pdev)
> return 0;
>
> /* Remove devices */
> - for (i = 0; i < AST_VHUB_NUM_PORTS; i++)
> + for (i = 0; i < vhub->max_ports; i++)
> ast_vhub_del_dev(&vhub->ports[i].dev);
>
> spin_lock_irqsave(&vhub->lock, flags);
> @@ -295,7 +290,7 @@ static int ast_vhub_remove(struct platform_device *pdev)
> if (vhub->ep0_bufs)
> dma_free_coherent(&pdev->dev,
> AST_VHUB_EP0_MAX_PACKET *
> - (AST_VHUB_NUM_PORTS + 1),
> + (vhub->max_ports + 1),
> vhub->ep0_bufs,
> vhub->ep0_bufs_dma);
> vhub->ep0_bufs = NULL;
> @@ -309,11 +304,32 @@ static int ast_vhub_probe(struct platform_device *pdev)
> struct ast_vhub *vhub;
> struct resource *res;
> int i, rc = 0;
> + const struct device_node *np = pdev->dev.of_node;
>
> vhub = devm_kzalloc(&pdev->dev, sizeof(*vhub), GFP_KERNEL);
> if (!vhub)
> return -ENOMEM;
>
> + rc = of_property_read_u32(np, "aspeed,vhub-downstream-ports",
> + &vhub->max_ports);
> + if (rc < 0)
> + return -ENODEV;

This breaks the driver for old devicetrees, or at the very least,
devicetrees without your subsequent two patches in the series.

I feel we shouldn't drop the built-in values for the 2400 and 2500, that
way we can fall back to them if the devicetree properties aren't present.

For the 2600 we can have a clean break and require the properties be
present (i.e. not hardcode the values in the driver for fallback) as there
aren't yet any devicetrees describing the device.

Andrew

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