linux-kernel - [PATCH v5 05/32] usb: host: xhci-mem: Allow for interrupter clients to choose specific index

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Date:   Tue, 29 Aug 2023 14:06:30 -0700
From:   Wesley Cheng <quic_wcheng@...cinc.com>
To:     <srinivas.kandagatla@...aro.org>, <mathias.nyman@...el.com>,
        <perex@...ex.cz>, <lgirdwood@...il.com>, <andersson@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <gregkh@...uxfoundation.org>,
        <Thinh.Nguyen@...opsys.com>, <broonie@...nel.org>,
        <bgoswami@...cinc.com>, <tiwai@...e.com>, <robh+dt@...nel.org>,
        <agross@...nel.org>
CC:     <linux-kernel@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
        <alsa-devel@...a-project.org>, <devicetree@...r.kernel.org>,
        <linux-usb@...r.kernel.org>, <quic_jackp@...cinc.com>,
        <quic_plai@...cinc.com>, Wesley Cheng <quic_wcheng@...cinc.com>
Subject: [PATCH v5 05/32] usb: host: xhci-mem: Allow for interrupter clients to choose specific index

Some clients may operate only on a specific XHCI interrupter instance.
Allow for the associated class driver to request for the interrupter that
it requires.

Signed-off-by: Wesley Cheng <quic_wcheng@...cinc.com>
---
 drivers/usb/host/xhci-mem.c   | 12 ++++++------
 include/linux/usb/xhci-intr.h |  2 +-
 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index 94cbc25e77ca..9d07aea34fc6 100644
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -2328,7 +2328,7 @@ xhci_add_interrupter(struct xhci_hcd *xhci, struct xhci_interrupter *ir,
 }
 
 struct xhci_interrupter *
-xhci_create_secondary_interrupter(struct usb_hcd *hcd)
+xhci_create_secondary_interrupter(struct usb_hcd *hcd, int intr_num)
 {
 	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 	struct xhci_interrupter *ir;
@@ -2343,15 +2343,15 @@ xhci_create_secondary_interrupter(struct usb_hcd *hcd)
 		return NULL;
 
 	spin_lock_irq(&xhci->lock);
-
 	/* Find available secondary interrupter, interrupter 0 is reserverd for primary */
 	for (i = 1; i < xhci->max_interrupters; i++) {
-		if (xhci->interrupters[i] == NULL) {
-			err = xhci_add_interrupter(xhci, ir, i);
-			break;
+		if ((intr_num > 0 && i == intr_num) || intr_num <= 0) {
+			if (xhci->interrupters[i] == NULL) {
+				err = xhci_add_interrupter(xhci, ir, i);
+				break;
+			}
 		}
 	}
-
 	spin_unlock_irq(&xhci->lock);
 	if (err) {
 		xhci_warn(xhci, "Failed to add secondary interrupter, max interrupters %d\n",
diff --git a/include/linux/usb/xhci-intr.h b/include/linux/usb/xhci-intr.h
index e0091ee2c73a..738b0f0481a6 100644
--- a/include/linux/usb/xhci-intr.h
+++ b/include/linux/usb/xhci-intr.h
@@ -81,6 +81,6 @@ struct xhci_interrupter {
 };
 
 struct xhci_interrupter *
-xhci_create_secondary_interrupter(struct usb_hcd *hcd);
+xhci_create_secondary_interrupter(struct usb_hcd *hcd, int intr_num);
 void xhci_remove_secondary_interrupter(struct usb_hcd *hcd, struct xhci_interrupter *ir);
 #endif