diff options
Diffstat (limited to 'recipes/linux/linux-omap-2.6.29/musb/0021-twl4030-usb-fix-minor-reporting-goofage.patch')
| -rw-r--r-- | recipes/linux/linux-omap-2.6.29/musb/0021-twl4030-usb-fix-minor-reporting-goofage.patch | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/recipes/linux/linux-omap-2.6.29/musb/0021-twl4030-usb-fix-minor-reporting-goofage.patch b/recipes/linux/linux-omap-2.6.29/musb/0021-twl4030-usb-fix-minor-reporting-goofage.patch new file mode 100644 index 0000000000..d9733f92b0 --- /dev/null +++ b/recipes/linux/linux-omap-2.6.29/musb/0021-twl4030-usb-fix-minor-reporting-goofage.patch @@ -0,0 +1,70 @@ +From c4804e5a447275553c55bbb0ab1748954cb8fbfc Mon Sep 17 00:00:00 2001 +From: David Brownell <dbrownell-Rn4VEauK+AKRv+LV9MX5uipxlwaOVQ5f@public.gmane.org> +Date: Tue, 31 Mar 2009 12:26:10 -0700 +Subject: [PATCH] twl4030-usb: fix minor reporting goofage + +Fix a reporting glitch in the twl4030 USB transceiver code. +It wasn't properly distinguishing the two types of active +USB link: ID grounded, vs not. In the current code that +distinction doesn't much matter; in the future this bugfix +should help support better USB controller communications. + +Provide a comment sorting out some of the cryptic bits of +the manual: different sections use different names for +key signals, and the register definitions don't help much +without the explanations and diagrams. + +Signed-off-by: David Brownell <dbrownell-Rn4VEauK+AKRv+LV9MX5uipxlwaOVQ5f@public.gmane.org> +--- + drivers/usb/otg/twl4030-usb.c | 26 +++++++++++++++++++------- + 1 files changed, 19 insertions(+), 7 deletions(-) + +diff --git a/drivers/usb/otg/twl4030-usb.c b/drivers/usb/otg/twl4030-usb.c +index d9478d0..f740390 100644 +--- a/drivers/usb/otg/twl4030-usb.c ++++ b/drivers/usb/otg/twl4030-usb.c +@@ -217,6 +217,7 @@ + + /* In module TWL4030_MODULE_PM_MASTER */ + #define PROTECT_KEY 0x0E ++#define STS_HW_CONDITIONS 0x0F + + /* In module TWL4030_MODULE_PM_RECEIVER */ + #define VUSB_DEDICATED1 0x7D +@@ -351,15 +352,26 @@ static enum linkstat twl4030_usb_linkstat(struct twl4030_usb *twl) + int status; + int linkstat = USB_LINK_UNKNOWN; + +- /* STS_HW_CONDITIONS */ +- status = twl4030_readb(twl, TWL4030_MODULE_PM_MASTER, 0x0f); ++ /* ++ * For ID/VBUS sensing, see manual section 15.4.8 ... ++ * except when using only battery backup power, two ++ * comparators produce VBUS_PRES and ID_PRES signals, ++ * which don't match docs elsewhere. But ... BIT(7) ++ * and BIT(2) of STS_HW_CONDITIONS, respectively, do ++ * seem to match up. If either is true the USB_PRES ++ * signal is active, the OTG module is activated, and ++ * its interrupt may be raised (may wake the system). ++ */ ++ status = twl4030_readb(twl, TWL4030_MODULE_PM_MASTER, ++ STS_HW_CONDITIONS); + if (status < 0) + dev_err(twl->dev, "USB link status err %d\n", status); +- else if (status & BIT(7)) +- linkstat = USB_LINK_VBUS; +- else if (status & BIT(2)) +- linkstat = USB_LINK_ID; +- else ++ else if (status & (BIT(7) | BIT(2))) { ++ if (status & BIT(2)) ++ linkstat = USB_LINK_ID; ++ else ++ linkstat = USB_LINK_VBUS; ++ } else + linkstat = USB_LINK_NONE; + + dev_dbg(twl->dev, "HW_CONDITIONS 0x%02x/%d; link %d\n", +-- +1.6.0.4 + |