linux-kernel - [PATCH] xhci: remove the unused sw_lpm

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Message-ID: <1539689828-35940-1-git-send-email-prime.zeng@hisilicon.com>
Date:   Tue, 16 Oct 2018 19:37:08 +0800
From:   Zeng Tao <prime.zeng@...ilicon.com>
To:     <mathias.nyman@...el.com>, <gregkh@...uxfoundation.org>
CC:     Zeng Tao <prime.zeng@...ilicon.com>, <linux-usb@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH] xhci: remove the unused sw_lpm_support

It is introduced for the pre-0.96 xHC controllers, and the driver only
support HW LPM for 1.0 and later controllers.It's not actually used now
and is thought not to be used in the future any more, so just remove it.

Acked-by: Mathias Nyman <mathias.nyman@...el.com>
Signed-off-by: Zeng Tao <prime.zeng@...ilicon.com>
---
 drivers/usb/host/xhci-mem.c | 20 ++++----------------
 drivers/usb/host/xhci.c     |  3 +--
 drivers/usb/host/xhci.h     |  2 --
 3 files changed, 5 insertions(+), 20 deletions(-)

diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index b1f27aa..791c5d8 100644
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -2181,23 +2181,11 @@ static void xhci_add_in_port(struct xhci_hcd *xhci, unsigned int num_ports,
 	if (major_revision < 0x03 && xhci->num_ext_caps < max_caps)
 		xhci->ext_caps[xhci->num_ext_caps++] = temp;
 
-	/* Check the host's USB2 LPM capability */
-	if ((xhci->hci_version == 0x96) && (major_revision != 0x03) &&
-			(temp & XHCI_L1C)) {
+	if ((xhci->hci_version >= 0x100) && (major_revision != 0x03) &&
+		 (temp & XHCI_HLC)) {
 		xhci_dbg_trace(xhci, trace_xhci_dbg_init,
-				"xHCI 0.96: support USB2 software lpm");
-		xhci->sw_lpm_support = 1;
-	}
-
-	if ((xhci->hci_version >= 0x100) && (major_revision != 0x03)) {
-		xhci_dbg_trace(xhci, trace_xhci_dbg_init,
-				"xHCI 1.0: support USB2 software lpm");
-		xhci->sw_lpm_support = 1;
-		if (temp & XHCI_HLC) {
-			xhci_dbg_trace(xhci, trace_xhci_dbg_init,
-					"xHCI 1.0: support USB2 hardware lpm");
-			xhci->hw_lpm_support = 1;
-		}
+			       "xHCI 1.0: support USB2 hardware lpm");
+		xhci->hw_lpm_support = 1;
 	}
 
 	port_offset--;
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index 0420eef..d565d5a 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -4372,8 +4372,7 @@ static int xhci_update_device(struct usb_hcd *hcd, struct usb_device *udev)
 	struct xhci_hcd	*xhci = hcd_to_xhci(hcd);
 	int		portnum = udev->portnum - 1;
 
-	if (hcd->speed >= HCD_USB3 || !xhci->sw_lpm_support ||
-			!udev->lpm_capable)
+	if (hcd->speed >= HCD_USB3 || !udev->lpm_capable)
 		return 0;
 
 	/* we only support lpm for non-hub device connected to root hub yet */
diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
index 6230a57..746129d 100644
--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -1854,8 +1854,6 @@ struct xhci_hcd {
 	struct xhci_port	*hw_ports;
 	struct xhci_hub		usb2_rhub;
 	struct xhci_hub		usb3_rhub;
-	/* support xHCI 0.96 spec USB2 software LPM */
-	unsigned		sw_lpm_support:1;
 	/* support xHCI 1.0 spec USB2 hardware LPM */
 	unsigned		hw_lpm_support:1;
 	/* cached usb2 extened protocol capabilites */
-- 
2.7.4