lkml.org 
[lkml]   [2019]   [Jan]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v2 3/6] usb: host: Stops USB controller init if PLL fails to lock
Date
From: yinbo.zhu <yinbo.zhu@nxp.com>

USB erratum-A006918 workaround tries to start internal PHY inside
uboot (when PLL fails to lock). However, if the workaround also
fails, then USB initialization is also stopped inside Linux.
Erratum-A006918 workaround failure creates "fsl,erratum_a006918"
node in device-tree. Presence of this node in device-tree is
used to stop USB controller initialization in Linux

Signed-off-by: Ramneek Mehresh <ramneek.mehresh@freescale.com>
Signed-off-by: Suresh Gupta <suresh.gupta@freescale.com>
Signed-off-by: Yinbo Zhu <yinbo.zhu@nxp.com>
---
Change in v2:
replace Yinbo.Zhu with Yinbo Zhu

drivers/usb/host/ehci-fsl.c | 5 +++++
drivers/usb/host/fsl-mph-dr-of.c | 5 +++++
2 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/drivers/usb/host/ehci-fsl.c b/drivers/usb/host/ehci-fsl.c
index a28ec1e..6884130 100644
--- a/drivers/usb/host/ehci-fsl.c
+++ b/drivers/usb/host/ehci-fsl.c
@@ -224,6 +224,11 @@ static int ehci_fsl_setup_phy(struct usb_hcd *hcd,
portsc |= PORT_PTS_PTW;
/* fall through */
case FSL_USB2_PHY_UTMI:
+ if (pdata->has_fsl_erratum_a006918) {
+ pr_warn("fsl-ehci: USB PHY clock invalid\n");
+ return -EINVAL;
+ }
+
case FSL_USB2_PHY_UTMI_DUAL:
/* PHY_CLK_VALID bit is de-featured from all controller
* versions below 2.4 and is to be checked only for
diff --git a/drivers/usb/host/fsl-mph-dr-of.c b/drivers/usb/host/fsl-mph-dr-of.c
index 677f9d5..7e07701 100644
--- a/drivers/usb/host/fsl-mph-dr-of.c
+++ b/drivers/usb/host/fsl-mph-dr-of.c
@@ -225,6 +225,11 @@ static int fsl_usb2_mph_dr_of_probe(struct platform_device *ofdev)
pdata->has_fsl_erratum_a005697 =
of_property_read_bool(np, "fsl,usb_erratum-a005697");

+ if (of_get_property(np, "fsl,erratum_a006918", NULL))
+ pdata->has_fsl_erratum_a006918 = 1;
+ else
+ pdata->has_fsl_erratum_a006918 = 0;
+
/*
* Determine whether phy_clk_valid needs to be checked
* by reading property in device tree
--
1.7.1
\
 
 \ /
  Last update: 2019-01-21 11:26    [W:0.077 / U:1.944 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site