linux-kernel - [PATCH] usb: dwc2: Fix call location of dwc2_check_core

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Date:   Mon, 27 Aug 2018 18:36:38 -0300
From:   Bruno Meirelles Herrera <bmh@...ti.org.br>
To:     Minas Harutyunyan <hminas@...opsys.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     John.Youn@...opsys.com, alexandre.torgue@...com,
        Bruno Meirelles Herrera <bmh@...ti.org.br>
Subject: [PATCH] usb: dwc2: Fix call location of dwc2_check_core_endianness

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@...ti.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)