linux-kernel - [PATCH 5.4 31/65] usb: host: xhci-plat: add priv quirk for skip PHY initialization

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Date:   Mon,  8 Feb 2021 16:01:03 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jun Li <jun.li@....com>,
        Peter Chen <peter.chen@....com>,
        Mathias Nyman <mathias.nyman@...ux.intel.com>
Subject: [PATCH 5.4 31/65] usb: host: xhci-plat: add priv quirk for skip PHY initialization

From: Peter Chen <peter.chen@....com>

commit f768e718911e03a4a20b65f984eaa9b09045e4cd upstream.

Some DRD controllers (eg, dwc3 & cdns3) have PHY management at
their own driver to cover both device and host mode, so add one
priv quirk for such users to skip PHY management from HCD core.

Reviewed-by: Jun Li <jun.li@....com>
Signed-off-by: Peter Chen <peter.chen@....com>
Signed-off-by: Mathias Nyman <mathias.nyman@...ux.intel.com>
Link: https://lore.kernel.org/r/20200918131752.16488-5-mathias.nyman@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/usb/host/xhci-plat.c |    8 ++++++--
 drivers/usb/host/xhci.h      |    1 +
 2 files changed, 7 insertions(+), 2 deletions(-)

--- a/drivers/usb/host/xhci-plat.c
+++ b/drivers/usb/host/xhci-plat.c
@@ -163,6 +163,8 @@ static int xhci_plat_probe(struct platfo
 	struct usb_hcd		*hcd;
 	int			ret;
 	int			irq;
+	struct xhci_plat_priv	*priv = NULL;
+
 
 	if (usb_disabled())
 		return -ENODEV;
@@ -257,8 +259,7 @@ static int xhci_plat_probe(struct platfo
 
 	priv_match = of_device_get_match_data(&pdev->dev);
 	if (priv_match) {
-		struct xhci_plat_priv *priv = hcd_to_xhci_priv(hcd);
-
+		priv = hcd_to_xhci_priv(hcd);
 		/* Just copy data for now */
 		if (priv_match)
 			*priv = *priv_match;
@@ -307,6 +308,9 @@ static int xhci_plat_probe(struct platfo
 
 	hcd->tpl_support = of_usb_host_tpl_support(sysdev->of_node);
 	xhci->shared_hcd->tpl_support = hcd->tpl_support;
+	if (priv && (priv->quirks & XHCI_SKIP_PHY_INIT))
+		hcd->skip_phy_initialization = 1;
+
 	ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
 	if (ret)
 		goto disable_usb_phy;
--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -1873,6 +1873,7 @@ struct xhci_hcd {
 #define XHCI_DEFAULT_PM_RUNTIME_ALLOW	BIT_ULL(33)
 #define XHCI_RESET_PLL_ON_DISCONNECT	BIT_ULL(34)
 #define XHCI_SNPS_BROKEN_SUSPEND    BIT_ULL(35)
+#define XHCI_SKIP_PHY_INIT	BIT_ULL(37)
 #define XHCI_DISABLE_SPARSE	BIT_ULL(38)
 
 	unsigned int		num_active_eps;