linux-kernel - [PATCH 2/2] usb: host: XHCI: xhci-mtk.c: support mediatek,keep-clock-on

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Date:   Mon, 2 Nov 2020 15:18:49 +0800
From:   Macpaul Lin <macpaul.lin@...iatek.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Mathias Nyman <mathias.nyman@...el.com>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>,
        <linux-usb@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
CC:     Ainge Hsu <ainge.hsu@...iatek.com>,
        Eddie Hung <eddie.hung@...iatek.com>,
        Mediatek WSD Upstream <wsd_upstream@...iatek.com>,
        Macpaul Lin <macpaul.lin@...iatek.com>,
        Macpaul Lin <macpaul@...il.com>
Subject: [PATCH 2/2] usb: host: XHCI: xhci-mtk.c: support mediatek,keep-clock-on

Some platform dose not support turn off clock when system suspending.
We add an option "mediatek,keep-clock-on" for distinquish these platforms.
When "mediatek,keep-clock-on" has been set, xhci-mtk driver will skip
turning clock on and off during system suspend and resume.

Signed-off-by: Macpaul Lin <macpaul.lin@...iatek.com>
---
 drivers/usb/host/xhci-mtk.c |    9 +++++++--
 drivers/usb/host/xhci-mtk.h |    1 +
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/host/xhci-mtk.c b/drivers/usb/host/xhci-mtk.c
index 4311d4c..c6c2804 100644
--- a/drivers/usb/host/xhci-mtk.c
+++ b/drivers/usb/host/xhci-mtk.c
@@ -464,6 +464,9 @@ static int xhci_mtk_probe(struct platform_device *pdev)
 	of_property_read_u32(node, "mediatek,u3p-dis-msk",
 			     &mtk->u3p_dis_msk);
 
+	/* keep clock on when suspending on some platform */
+	mtk->keep_clk_on = of_property_read_bool(node, "mediatek,keep-clock-on");
+
 	ret = usb_wakeup_of_property_parse(mtk, node);
 	if (ret) {
 		dev_err(dev, "failed to parse uwk property\n");
@@ -624,7 +627,8 @@ static int __maybe_unused xhci_mtk_suspend(struct device *dev)
 	del_timer_sync(&xhci->shared_hcd->rh_timer);
 
 	xhci_mtk_host_disable(mtk);
-	xhci_mtk_clks_disable(mtk);
+	if (!mtk->keep_clk_on)
+		xhci_mtk_clks_disable(mtk);
 	usb_wakeup_set(mtk, true);
 	return 0;
 }
@@ -636,7 +640,8 @@ static int __maybe_unused xhci_mtk_resume(struct device *dev)
 	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 
 	usb_wakeup_set(mtk, false);
-	xhci_mtk_clks_enable(mtk);
+	if (!mtk->keep_clk_on)
+		xhci_mtk_clks_enable(mtk);
 	xhci_mtk_host_enable(mtk);
 
 	xhci_dbg(xhci, "%s: restart port polling\n", __func__);
diff --git a/drivers/usb/host/xhci-mtk.h b/drivers/usb/host/xhci-mtk.h
index a93cfe8..37639c5 100644
--- a/drivers/usb/host/xhci-mtk.h
+++ b/drivers/usb/host/xhci-mtk.h
@@ -152,6 +152,7 @@ struct xhci_hcd_mtk {
 	struct regmap *uwk;
 	u32 uwk_reg_base;
 	u32 uwk_vers;
+	bool keep_clk_on;
 };
 
 static inline struct xhci_hcd_mtk *hcd_to_mtk(struct usb_hcd *hcd)
-- 
1.7.9.5