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usb: musb: Add a quirk to preserve the session during suspend

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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 <abailon@baylibre.com>
Signed-off-by: Bin Liu <b-liu@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alexandre Bailon 2017-02-01 21:30:19 -06:00 committed by Greg Kroah-Hartman
parent 71f5a0ad9e
commit a926ed11e7
2 changed files with 3 additions and 1 deletions
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3
drivers/usb/musb/musb_core.c
View File

@ -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);

1
drivers/usb/musb/musb_core.h
View File

@ -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)