From mboxrd@z Thu Jan 1 00:00:00 1970 From: Hui.Wang@windriver.com (Wang Hui) Date: Mon, 15 Mar 2010 18:23:42 +0800 Subject: [PATCH 2/2] USB: musb: omap2430: add mode change from A to B In-Reply-To: <1268648622-28529-1-git-send-email-Hui.Wang@windriver.com> References: <1268648622-28529-1-git-send-email-Hui.Wang@windriver.com> Message-ID: <1268648622-28529-2-git-send-email-Hui.Wang@windriver.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On omap2/3 series platforms, the musb can't raise id pin change detection interrupt, so we must change otg mode through sysfs interface manually. Currently when the musb is in B mode, if we want musb to be changed to A mode, we should plug a mini-A cable and then execute echo host > /sys/devices/platform/musb_hdrc/mode. But if the musb is in A mode, we can't change it to B mode through this method. To solve this problem, add a process for sending end session request. This process works like this, if the musb is in A mode, it will send an end session request first, then it will follow original routine: start a new session, during this session, it will identify whether A or B is plugging in the socket, then it will init controller to A or B mode according to its identification. Usage: change cable as you desired, change musb mode by #>echo host[peripheral] > /sys/devices/\ platform/musb_hdrc/mode, then you will get required musb mode. Signed-off-by: Wang Hui --- drivers/usb/musb/omap2430.c | 5 +++++ 1 files changed, 5 insertions(+), 0 deletions(-) diff --git a/drivers/usb/musb/omap2430.c b/drivers/usb/musb/omap2430.c index 3fe1686..b02897e 100644 --- a/drivers/usb/musb/omap2430.c +++ b/drivers/usb/musb/omap2430.c @@ -194,6 +194,11 @@ int musb_platform_set_mode(struct musb *musb, u8 musb_mode) { u8 devctl = musb_readb(musb->mregs, MUSB_DEVCTL); + if ((devctl & MUSB_DEVCTL_BDEVICE) == 0x0) { + devctl &= ~MUSB_DEVCTL_SESSION; + musb_writeb(musb->mregs, MUSB_DEVCTL, devctl); + } + devctl |= MUSB_DEVCTL_SESSION; musb_writeb(musb->mregs, MUSB_DEVCTL, devctl); -- 1.5.6.5