From a926ed11e7b4325f0ece739d7188e8bdbb99fb44 Mon Sep 17 00:00:00 2001 From: Alexandre Bailon Date: Wed, 1 Feb 2017 21:30:19 -0600 Subject: [PATCH] usb: musb: Add a quirk to preserve the session during suspend On da8xx, VBUS is not maintained during suspend when musb is in host mode. On resume, all the connected devices will be disconnected and then will be enumerated again. This happens because MUSB_DEVCTL is cleared during suspend. Add a quirk to not clear MUSB_DEVCTL and then preserve the session during a suspend. Signed-off-by: Alexandre Bailon Signed-off-by: Bin Liu Signed-off-by: Greg Kroah-Hartman --- drivers/usb/musb/musb_core.c | 3 ++- drivers/usb/musb/musb_core.h | 1 + 2 files changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c index b1f082f42112..27887189fd14 100644 --- a/drivers/usb/musb/musb_core.c +++ b/drivers/usb/musb/musb_core.c @@ -2659,7 +2659,8 @@ static int musb_suspend(struct device *dev) musb_platform_disable(musb); musb_disable_interrupts(musb); - musb_writeb(musb->mregs, MUSB_DEVCTL, 0); + if (!(musb->io.quirks & MUSB_PRESERVE_SESSION)) + musb_writeb(musb->mregs, MUSB_DEVCTL, 0); WARN_ON(!list_empty(&musb->pending_list)); spin_lock_irqsave(&musb->lock, flags); diff --git a/drivers/usb/musb/musb_core.h b/drivers/usb/musb/musb_core.h index ade902ea1221..ab0c858af9d3 100644 --- a/drivers/usb/musb/musb_core.h +++ b/drivers/usb/musb/musb_core.h @@ -172,6 +172,7 @@ struct musb_io; */ struct musb_platform_ops { +#define MUSB_PRESERVE_SESSION BIT(7) #define MUSB_DMA_UX500 BIT(6) #define MUSB_DMA_CPPI41 BIT(5) #define MUSB_DMA_CPPI BIT(4) -- 2.11.0