diff options
Diffstat (limited to 'kernels/linux-libre-rt/0013-phy-twl4030-usb-better-handle-musb_mailbox-failure.patch')
| -rw-r--r-- | kernels/linux-libre-rt/0013-phy-twl4030-usb-better-handle-musb_mailbox-failure.patch | 62 |
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 + |