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-rw-r--r--kernels/linux-libre-rt/0013-phy-twl4030-usb-better-handle-musb_mailbox-failure.patch62
1 files changed, 62 insertions, 0 deletions
diff --git a/kernels/linux-libre-rt/0013-phy-twl4030-usb-better-handle-musb_mailbox-failure.patch b/kernels/linux-libre-rt/0013-phy-twl4030-usb-better-handle-musb_mailbox-failure.patch
new file mode 100644
index 000000000..de2501214
--- /dev/null
+++ b/kernels/linux-libre-rt/0013-phy-twl4030-usb-better-handle-musb_mailbox-failure.patch
@@ -0,0 +1,62 @@
+From 04facfb4b4b49337f83bcb87eb40ce54cebfab5c Mon Sep 17 00:00:00 2001
+From: Andreas Kemnade <andreas@kemnade.info>
+Date: Mon, 22 Aug 2016 21:24:22 +0200
+Subject: [PATCH 13/14] phy-twl4030-usb: better handle musb_mailbox() failure
+
+setting twl->linkstat = MUSB_UNKNOWN upon error in musb_mailbox as
+introduced in
+commit 12b7db2bf8b8 ("usb: musb: Return error value from musb_mailbox")
+causes twl4030_usb_irq() to not detect a state change form cable connected
+to cable disconnected after such an error so that
+pm_runtime_put_autosuspend() will not be called and the usage counter
+gets unbalanced. Such errors happen e.g. if the omap2430 module is not
+(yet) loaded during plug/unplug events.
+
+This patch introduces a flag instead that indicates whether there is
+information for the musb_mailbox pending and calls musb_mailbox() if
+that flag is set.
+
+Signed-off-by: Andreas Kemnade <andreas@kemnade.info>
+Tested-by: Tony Lindgren <tony@atomide.com>
+---
+ drivers/phy/phy-twl4030-usb.c | 9 +++++++--
+ 1 file changed, 7 insertions(+), 2 deletions(-)
+
+diff --git a/drivers/phy/phy-twl4030-usb.c b/drivers/phy/phy-twl4030-usb.c
+index d9b10a3..81067b4 100644
+--- a/drivers/phy/phy-twl4030-usb.c
++++ b/drivers/phy/phy-twl4030-usb.c
+@@ -172,6 +172,7 @@ struct twl4030_usb {
+ int irq;
+ enum musb_vbus_id_status linkstat;
+ bool vbus_supplied;
++ bool musb_mailbox_pending;
+
+ struct delayed_work id_workaround_work;
+ };
+@@ -569,9 +570,12 @@ static irqreturn_t twl4030_usb_irq(int irq, void *_twl)
+ pm_runtime_mark_last_busy(twl->dev);
+ pm_runtime_put_autosuspend(twl->dev);
+ }
++ twl->musb_mailbox_pending = true;
++ }
++ if (twl->musb_mailbox_pending) {
+ err = musb_mailbox(status);
+- if (err)
+- twl->linkstat = MUSB_UNKNOWN;
++ if (!err)
++ twl->musb_mailbox_pending = false;
+ }
+
+ /* don't schedule during sleep - irq works right then */
+@@ -676,6 +680,7 @@ static int twl4030_usb_probe(struct platform_device *pdev)
+ twl->irq = platform_get_irq(pdev, 0);
+ twl->vbus_supplied = false;
+ twl->linkstat = MUSB_UNKNOWN;
++ twl->musb_mailbox_pending = false;
+
+ twl->phy.dev = twl->dev;
+ twl->phy.label = "twl4030";
+--
+2.10.0
+