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Commit d835cc3c authored by Alessandro Rubini's avatar Alessandro Rubini
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patches/kernel: work around the ttyACM problem of some devices 

Some WRS speciments won't work correctly with automatic speed setup.
This patch forces full-speed on the device (instead of the
autodetected high-speed), and thus they work.

Speed is not a problem anyways, because it is just a serial port.
Signed-off-by: Alessandro Rubini's avatarAlessandro Rubini <rubini@gnudd.com>
parent 2382329c
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patches/kernel/v2.6.39/0009-at91-udc-force-full-speed.patch 0 → 100644
View file @ d835cc3c
From 1402207cdb93a0f12ef5b544184c17b35d4ffd12 Mon Sep 17 00:00:00 2001
From: Alessandro Rubini <rubini@gnudd.com>
Date: Tue, 17 Jun 2014 10:47:30 +0200
Subject: [PATCH 9/9] at91 udc: force full speed
Some WRS speciments won't work correctly with automatic speed setup.
This patch forces full-speed on the device (instead of the
autodetected high-speed), and thus they work.
Speed is not a problem anyways, because it is just a serial port.
Signed-off-by: Alessandro Rubini <rubini@gnudd.com>
---
drivers/usb/gadget/atmel_usba_udc.c | 7 +++++--
1 files changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/usb/gadget/atmel_usba_udc.c b/drivers/usb/gadget/atmel_usba_udc.c
index e7c65a4..bd6ccfb 100644
--- a/drivers/usb/gadget/atmel_usba_udc.c
+++ b/drivers/usb/gadget/atmel_usba_udc.c
@@ -1158,12 +1158,12 @@ static int do_test_mode(struct usba_udc *udc)
break;
case 0x0300:
/*
- * Test_SE0_NAK: Force high-speed mode and set up ep0
+ * Test_SE0_NAK: Force full-speed mode and set up ep0
* for Bulk IN transfers
*/
ep = &usba_ep[0];
usba_writel(udc, TST,
- USBA_BF(SPEED_CFG, USBA_SPEED_CFG_FORCE_HIGH));
+ USBA_BF(SPEED_CFG, USBA_SPEED_CFG_FORCE_FULL));
usba_ep_writel(ep, CFG,
USBA_BF(EPT_SIZE, USBA_EPT_SIZE_64)
| USBA_EPT_DIR_IN
@@ -1832,6 +1832,9 @@ int usb_gadget_probe_driver(struct usb_gadget_driver *driver,
toggle_bias(1);
usba_writel(udc, CTRL, USBA_ENABLE_MASK);
usba_writel(udc, INT_ENB, USBA_END_OF_RESET);
+ /* Also, force full spedd or sometimes it won't work on WRS */
+ usba_writel(udc, TST,
+ USBA_BF(SPEED_CFG, USBA_SPEED_CFG_FORCE_FULL));
}
spin_unlock_irqrestore(&udc->lock, flags);
--
1.7.7.2
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