linux-kernel - [PATCH v18 04/41] xhci: export XHCI IMOD setting helper for interrupters

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Date: Tue, 27 Feb 2024 17:35:42 -0800
From: Wesley Cheng <quic_wcheng@...cinc.com>
To: <srinivas.kandagatla@...aro.org>, <mathias.nyman@...el.com>,
        <perex@...ex.cz>, <conor+dt@...nel.org>, <corbet@....net>,
        <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>,
        <konrad.dybcio@...aro.org>
CC: <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-sound@...r.kernel.org>, <linux-usb@...r.kernel.org>,
        <linux-arm-msm@...r.kernel.org>, <linux-doc@...r.kernel.org>,
        <alsa-devel@...a-project.org>, Wesley Cheng <quic_wcheng@...cinc.com>
Subject: [PATCH v18 04/41] xhci: export XHCI IMOD setting helper for interrupters

Utilize the xhci_set_interrupter_moderation() API to set the IMOD value for
interrupters, so that secondary interrupts can also configure this
parameter when clients request for it.

Signed-off-by: Wesley Cheng <quic_wcheng@...cinc.com>
---
 drivers/usb/host/xhci.c | 3 ++-
 drivers/usb/host/xhci.h | 2 ++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index dfc59338afb6..5fa08c3db614 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -349,7 +349,7 @@ int xhci_disable_interrupter(struct xhci_interrupter *ir)
 EXPORT_SYMBOL_GPL(xhci_disable_interrupter);
 
 /* interrupt moderation interval imod_interval in nanoseconds */
-static int xhci_set_interrupter_moderation(struct xhci_interrupter *ir,
+int xhci_set_interrupter_moderation(struct xhci_interrupter *ir,
 					   u32 imod_interval)
 {
 	u32 imod;
@@ -364,6 +364,7 @@ static int xhci_set_interrupter_moderation(struct xhci_interrupter *ir,
 
 	return 0;
 }
+EXPORT_SYMBOL_GPL(xhci_set_interrupter_moderation);
 
 static void compliance_mode_recovery(struct timer_list *t)
 {
diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
index 9039f234cf52..77042df42b46 100644
--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -1875,6 +1875,8 @@ int xhci_alloc_tt_info(struct xhci_hcd *xhci,
 		struct usb_tt *tt, gfp_t mem_flags);
 int xhci_enable_interrupter(struct xhci_interrupter *ir);
 int xhci_disable_interrupter(struct xhci_interrupter *ir);
+int xhci_set_interrupter_moderation(struct xhci_interrupter *ir,
+					   u32 imod_interval);
 
 /* xHCI ring, segment, TRB, and TD functions */
 dma_addr_t xhci_trb_virt_to_dma(struct xhci_segment *seg, union xhci_trb *trb);