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130 lines
4.1 KiB
Diff
130 lines
4.1 KiB
Diff
From 903af89ac9a9b82b6e736ab04e3848672a0ab364 Mon Sep 17 00:00:00 2001
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From: Jonathan Bell <jonathan@raspberrypi.org>
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Date: Tue, 11 Jun 2019 11:33:39 +0100
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Subject: [PATCH] xhci: implement xhci_fixup_endpoint for interval
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adjustments
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Must be called in a non-atomic context, after the endpoint
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has been registered with the hardware via xhci_add_endpoint
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and before the first URB is submitted for the endpoint.
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Signed-off-by: Jonathan Bell <jonathan@raspberrypi.org>
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---
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drivers/usb/host/xhci.c | 98 +++++++++++++++++++++++++++++++++++++++++
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1 file changed, 98 insertions(+)
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--- a/drivers/usb/host/xhci.c
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+++ b/drivers/usb/host/xhci.c
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@@ -1425,6 +1425,103 @@ command_cleanup:
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}
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/*
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+ * RPI: Fixup endpoint intervals when requested
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+ * - Check interval versus the (cached) endpoint context
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+ * - set the endpoint interval to the new value
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+ * - force an endpoint configure command
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+ * XXX: bandwidth is not recalculated. We should probably do that.
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+ */
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+static void xhci_fixup_endpoint(struct usb_hcd *hcd, struct usb_device *udev,
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+ struct usb_host_endpoint *ep, int interval)
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+{
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+ struct xhci_hcd *xhci;
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+ struct xhci_ep_ctx *ep_ctx_out, *ep_ctx_in;
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+ struct xhci_command *command;
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+ struct xhci_input_control_ctx *ctrl_ctx;
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+ struct xhci_virt_device *vdev;
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+ int xhci_interval;
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+ int ret;
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+ int ep_index;
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+ unsigned long flags;
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+ u32 ep_info_tmp;
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+
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+ xhci = hcd_to_xhci(hcd);
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+ ep_index = xhci_get_endpoint_index(&ep->desc);
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+
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+ /* FS/LS interval translations */
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+ if ((udev->speed == USB_SPEED_FULL ||
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+ udev->speed == USB_SPEED_LOW))
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+ interval *= 8;
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+
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+ mutex_lock(&xhci->mutex);
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+
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+ spin_lock_irqsave(&xhci->lock, flags);
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+
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+ vdev = xhci->devs[udev->slot_id];
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+ /* Get context-derived endpoint interval */
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+ ep_ctx_out = xhci_get_ep_ctx(xhci, vdev->out_ctx, ep_index);
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+ ep_ctx_in = xhci_get_ep_ctx(xhci, vdev->in_ctx, ep_index);
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+ xhci_interval = EP_INTERVAL_TO_UFRAMES(le32_to_cpu(ep_ctx_out->ep_info));
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+
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+ if (interval == xhci_interval) {
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+ spin_unlock_irqrestore(&xhci->lock, flags);
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+ mutex_unlock(&xhci->mutex);
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+ return;
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+ }
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+
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+ xhci_dbg(xhci, "Fixup interval=%d xhci_interval=%d\n",
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+ interval, xhci_interval);
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+ command = xhci_alloc_command_with_ctx(xhci, true, GFP_ATOMIC);
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+ if (!command) {
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+ /* Failure here is benign, poll at the original rate */
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+ spin_unlock_irqrestore(&xhci->lock, flags);
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+ mutex_unlock(&xhci->mutex);
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+ return;
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+ }
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+
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+ /* xHCI uses exponents for intervals... */
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+ xhci_interval = fls(interval) - 1;
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+ xhci_interval = clamp_val(xhci_interval, 3, 10);
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+ ep_info_tmp = le32_to_cpu(ep_ctx_out->ep_info);
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+ ep_info_tmp &= ~EP_INTERVAL(255);
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+ ep_info_tmp |= EP_INTERVAL(xhci_interval);
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+
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+ /* Keep the endpoint context up-to-date while issuing the command. */
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+ xhci_endpoint_copy(xhci, vdev->in_ctx,
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+ vdev->out_ctx, ep_index);
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+ ep_ctx_in->ep_info = cpu_to_le32(ep_info_tmp);
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+
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+ /*
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+ * We need to drop the lock, so take an explicit copy
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+ * of the ep context.
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+ */
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+ xhci_endpoint_copy(xhci, command->in_ctx, vdev->in_ctx, ep_index);
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+
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+ ctrl_ctx = xhci_get_input_control_ctx(command->in_ctx);
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+ if (!ctrl_ctx) {
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+ xhci_warn(xhci,
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+ "%s: Could not get input context, bad type.\n",
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+ __func__);
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+ spin_unlock_irqrestore(&xhci->lock, flags);
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+ xhci_free_command(xhci, command);
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+ mutex_unlock(&xhci->mutex);
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+ return;
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+ }
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+ ctrl_ctx->add_flags = xhci_get_endpoint_flag_from_index(ep_index);
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+ ctrl_ctx->drop_flags = 0;
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+
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+ spin_unlock_irqrestore(&xhci->lock, flags);
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+
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+ ret = xhci_configure_endpoint(xhci, udev, command,
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+ false, false);
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+ if (ret)
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+ xhci_warn(xhci, "%s: Configure endpoint failed: %d\n",
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+ __func__, ret);
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+ xhci_free_command(xhci, command);
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+ mutex_unlock(&xhci->mutex);
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+}
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+
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+/*
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* non-error returns are a promise to giveback() the urb later
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* we drop ownership so next owner (or urb unlink) can get it
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*/
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@@ -5217,6 +5314,7 @@ static const struct hc_driver xhci_hc_dr
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.endpoint_reset = xhci_endpoint_reset,
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.check_bandwidth = xhci_check_bandwidth,
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.reset_bandwidth = xhci_reset_bandwidth,
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+ .fixup_endpoint = xhci_fixup_endpoint,
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.address_device = xhci_address_device,
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.enable_device = xhci_enable_device,
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.update_hub_device = xhci_update_hub_device,
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