arm-sdk

os build toolkit for various embedded devices
git clone https://git.parazyd.org/arm-sdk
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commit 926680290f3cdaf8bc1ce895d064b68910d848b3
parent de56d1cb27ded6bdbcb5512b51ede3f0777fd679
Author: parazyd <parazyd@dyne.org>
Date:   Thu,  8 Mar 2018 10:07:25 +0100

Add Merlijn's droid4 musb kernel patch.

Diffstat:
Aextra/patches/linux-droid4-patches/0018-usb-musb-fix-reading-vbus-registers.patch | 49+++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 49 insertions(+), 0 deletions(-)

diff --git a/extra/patches/linux-droid4-patches/0018-usb-musb-fix-reading-vbus-registers.patch b/extra/patches/linux-droid4-patches/0018-usb-musb-fix-reading-vbus-registers.patch @@ -0,0 +1,49 @@ +From b090e83acf4f71fd354c3fe82aeff9b7ae1dd3c2 Mon Sep 17 00:00:00 2001 +From: Merlijn Wajer <merlijn@wizzup.org> +Date: Sat, 24 Feb 2018 20:54:43 +0100 +Subject: [PATCH] usb: musb: call pm_runtime_{get,put}_sync before reading vbus + registers + +Without pm_runtime_{get,put}_sync calls in place, reading +vbus status via /sys causes the following error: + +Unhandled fault: external abort on non-linefetch (0x1028) at 0xfa0ab060 +pgd = b333e822 +[fa0ab060] *pgd=48011452(bad) + +[<c05261b0>] (musb_default_readb) from [<c0525bd0>] (musb_vbus_show+0x58/0xe4) +[<c0525bd0>] (musb_vbus_show) from [<c04c0148>] (dev_attr_show+0x20/0x44) +[<c04c0148>] (dev_attr_show) from [<c0259f74>] (sysfs_kf_seq_show+0x80/0xdc) +[<c0259f74>] (sysfs_kf_seq_show) from [<c0210bac>] (seq_read+0x250/0x448) +[<c0210bac>] (seq_read) from [<c01edb40>] (__vfs_read+0x1c/0x118) +[<c01edb40>] (__vfs_read) from [<c01edccc>] (vfs_read+0x90/0x144) +[<c01edccc>] (vfs_read) from [<c01ee1d0>] (SyS_read+0x3c/0x74) +[<c01ee1d0>] (SyS_read) from [<c0106fe0>] (ret_fast_syscall+0x0/0x54) + +Solution was suggested by Tony Lindgren <tony@atomide.com>. + +Signed-off-by: Merlijn Wajer <merlijn@wizzup.org> +--- + drivers/usb/musb/musb_core.c | 2 ++ + 1 file changed, 2 insertions(+) + +diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c +index ea5013aa69e25..e2e95071328a8 100644 +--- a/drivers/usb/musb/musb_core.c ++++ b/drivers/usb/musb/musb_core.c +@@ -1756,6 +1756,7 @@ musb_vbus_show(struct device *dev, struct device_attribute *attr, char *buf) + int vbus; + u8 devctl; + ++ pm_runtime_get_sync(dev); + spin_lock_irqsave(&musb->lock, flags); + val = musb->a_wait_bcon; + vbus = musb_platform_get_vbus_status(musb); +@@ -1769,6 +1770,7 @@ musb_vbus_show(struct device *dev, struct device_attribute *attr, char *buf) + vbus = 0; + } + spin_unlock_irqrestore(&musb->lock, flags); ++ pm_runtime_put_sync(dev); + + return sprintf(buf, "Vbus %s, timeout %lu msec\n", + vbus ? "on" : "off", val);