[PATCH v4 4/4] usb: xhci-mtk: support quirk to disable usb2 lpm

[Chunfeng Yun]

The xHCI driver support usb2 HW LPM by default, here add support
XHCI_HW_LPM_DISABLE quirk, then we can disable usb2 lpm when
need it.

Signed-off-by: Chunfeng Yun <chunfeng.yun at mediatek.com>
---
v2~4: no changes
---
 drivers/usb/host/xhci-mtk.c | 3 +++
 drivers/usb/host/xhci-mtk.h | 1 +
 2 files changed, 4 insertions(+)

diff --git a/drivers/usb/host/xhci-mtk.c b/drivers/usb/host/xhci-mtk.c
index 4e3d53cc24f4..744639d23fa8 100644
--- a/drivers/usb/host/xhci-mtk.c
+++ b/drivers/usb/host/xhci-mtk.c
@@ -411,6 +411,8 @@ static void xhci_mtk_quirks(struct device *dev, struct xhci_hcd *xhci)
 	xhci->quirks |= XHCI_SPURIOUS_SUCCESS;
 	if (mtk->lpm_support)
 		xhci->quirks |= XHCI_LPM_SUPPORT;
+	if (mtk->u2_lpm_disable)
+		xhci->quirks |= XHCI_HW_LPM_DISABLE;
 
 	/*
 	 * MTK xHCI 0.96: PSA is 1 by default even if doesn't support stream,
@@ -493,6 +495,7 @@ static int xhci_mtk_probe(struct platform_device *pdev)
 		return ret;
 
 	mtk->lpm_support = of_property_read_bool(node, "usb3-lpm-capable");
+	mtk->u2_lpm_disable = of_property_read_bool(node, "usb2-lpm-disable");
 	/* optional property, ignore the error if it does not exist */
 	of_property_read_u32(node, "mediatek,u3p-dis-msk",
 			     &mtk->u3p_dis_msk);
diff --git a/drivers/usb/host/xhci-mtk.h b/drivers/usb/host/xhci-mtk.h
index 621ec1a85009..4ccd08e20a15 100644
--- a/drivers/usb/host/xhci-mtk.h
+++ b/drivers/usb/host/xhci-mtk.h
@@ -149,6 +149,7 @@ struct xhci_hcd_mtk {
 	struct phy **phys;
 	int num_phys;
 	bool lpm_support;
+	bool u2_lpm_disable;
 	/* usb remote wakeup */
 	bool uwk_en;
 	struct regmap *uwk;
-- 
2.18.0