From: Bruno Meirelles Herrera <bmh@certi.org.br>
To: Minas Harutyunyan <hminas@synopsys.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: John.Youn@synopsys.com, alexandre.torgue@st.com,
Bruno Meirelles Herrera <bmh@certi.org.br>
Subject: [PATCH] usb: dwc2: Fix call location of dwc2_check_core_endianness
Date: Mon, 27 Aug 2018 18:36:38 -0300 [thread overview]
Message-ID: <20180827213638.18890-1-bmh@certi.org.br> (raw)
Some SoC/IP as STM32F469, the snpsid can only be read after clock is
enabled, otherwise it will read as 0, and the dwc2_check_core_endianness
will assume the core and AHB have opposite endianness, leading to the
following error:
[ 1.976339] dwc2 50000000.usb: 50000000.usb supply vusb_d not found, using dummy regulator
[ 1.986124] dwc2 50000000.usb: Linked as a consumer to regulator.0
[ 1.992711] dwc2 50000000.usb: 50000000.usb supply vusb_a not found, using dummy regulator
[ 2.003672] dwc2 50000000.usb: dwc2_core_reset: HANG! AHB Idle timeout GRSTCTL GRSTCTL_AHBIDLE
[ 2.015176] dwc2: probe of 50000000.usb failed with error -16
The proposed patch changes the location where dwc2_check_core_endianness
is called, allowing the clock peripheral to be enabled first.
Signed-off-by: Bruno Meirelles Herrera <bmh@certi.org.br>
---
drivers/usb/dwc2/platform.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/usb/dwc2/platform.c b/drivers/usb/dwc2/platform.c
index 9a53a58e676e..577642895b57 100644
--- a/drivers/usb/dwc2/platform.c
+++ b/drivers/usb/dwc2/platform.c
@@ -412,8 +412,6 @@ static int dwc2_driver_probe(struct platform_device *dev)
dev_dbg(&dev->dev, "mapped PA %08lx to VA %p\n",
(unsigned long)res->start, hsotg->regs);
- hsotg->needs_byte_swap = dwc2_check_core_endianness(hsotg);
-
retval = dwc2_lowlevel_hw_init(hsotg);
if (retval)
return retval;
@@ -438,6 +436,8 @@ static int dwc2_driver_probe(struct platform_device *dev)
if (retval)
return retval;
+ hsotg->needs_byte_swap = dwc2_check_core_endianness(hsotg);
+
retval = dwc2_get_dr_mode(hsotg);
if (retval)
goto error;
--
2.15.2 (Apple Git-101.1)
next reply other threads:[~2018-08-27 21:43 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-27 21:36 Bruno Meirelles Herrera [this message]
2018-09-01 22:43 ` [PATCH] usb: dwc2: Fix call location of dwc2_check_core_endianness Martin Blumenstingl
2018-09-03 8:09 ` Minas Harutyunyan
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