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Message-ID: <1604658097-5127-2-git-send-email-macpaul.lin@mediatek.com>
Date: Fri, 6 Nov 2020 18:21:37 +0800
From: Macpaul Lin <macpaul.lin@...iatek.com>
To: Rob Herring <robh@...nel.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Matthias Brugger <matthias.bgg@...il.com>,
Mathias Nyman <mathias.nyman@...el.com>,
Chunfeng Yun <Chunfeng.Yun@...iatek.com>
CC: Ainge Hsu <ainge.hsu@...iatek.com>,
Eddie Hung <eddie.hung@...iatek.com>,
Chunfeng Yun <chunfeng.yun@...iatek.com>,
Mediatek WSD Upstream <wsd_upstream@...iatek.com>,
Macpaul Lin <macpaul.lin@...iatek.com>,
"Macpaul Lin" <macpaul@...il.com>, <linux-kernel@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-usb@...r.kernel.org>, <linux-mediatek@...ts.infradead.org>,
<stable@...r.kernel.org>
Subject: [PATCH v3 2/2] usb: host: XHCI: xhci-mtk.c: support mediatek,str-clock-on
Some platform dose not support turn off clock when system suspending.
We add an option "mediatek,str-clock-on" for distinquish these platforms.
When "mediatek,str-clock-on" has been set, xhci-mtk driver will skip
turning clock on and off during system suspend and resume.
Fixes: 0cbd4b34cda9 ("xhci: mediatek: support MTK xHCI host controller")
Signed-off-by: Macpaul Lin <macpaul.lin@...iatek.com>
Cc: stable@...r.kernel.org
---
Changes for v3:
- Add "Fixes" tag as a bug fix on phone system.
Changes for v2:
- Replace "mediatek,keep-clock-on" to "mediatek,str-clock-on" which implies
this option related to STR functions.
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..77b0d7a 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);
+ /* STR: keep clock on when suspending on some platform */
+ mtk->str_clk_on = of_property_read_bool(node, "mediatek,str-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->str_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->str_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..4039b025 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 str_clk_on;
};
static inline struct xhci_hcd_mtk *hcd_to_mtk(struct usb_hcd *hcd)
--
1.7.9.5
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