This is a note to let you know that I've just added the patch titled
usb: phy: am335x-control: wait 1ms after power-up transitions
to the 3.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
usb-phy-am335x-control-wait-1ms-after-power-up-transitions.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From a31a942a148e0083ce560ffeb54fb60e06ab7201 Mon Sep 17 00:00:00 2001
From: Daniel Mack <zonque@xxxxxxxxx>
Date: Wed, 16 Apr 2014 17:11:16 +0200
Subject: usb: phy: am335x-control: wait 1ms after power-up transitions
From: Daniel Mack <zonque@xxxxxxxxx>
commit a31a942a148e0083ce560ffeb54fb60e06ab7201 upstream.
Tests have shown that when a power-up transition is followed by other
PHY operations too quickly, the USB port appears dead. Waiting 1ms fixes
this problem.
Signed-off-by: Daniel Mack <zonque@xxxxxxxxx>
Signed-off-by: Felipe Balbi <balbi@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/phy/phy-am335x-control.c | 9 +++++++++
1 file changed, 9 insertions(+)
--- a/drivers/usb/phy/phy-am335x-control.c
+++ b/drivers/usb/phy/phy-am335x-control.c
@@ -3,6 +3,7 @@
#include <linux/err.h>
#include <linux/of.h>
#include <linux/io.h>
+#include <linux/delay.h>
#include "am35x-phy-control.h"
struct am335x_control_usb {
@@ -86,6 +87,14 @@ static void am335x_phy_power(struct phy_
}
writel(val, usb_ctrl->phy_reg + reg);
+
+ /*
+ * Give the PHY ~1ms to complete the power up operation.
+ * Tests have shown unstable behaviour if other USB PHY related
+ * registers are written too shortly after such a transition.
+ */
+ if (on)
+ mdelay(1);
}
static const struct phy_control ctrl_am335x = {
Patches currently in stable-queue which might be from zonque@xxxxxxxxx are
queue-3.14/usb-phy-am335x-control-wait-1ms-after-power-up-transitions.patch
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