On Mon, Nov 28, 2016 at 05:26:21PM +0100, Alexandre Bailon wrote:
> 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.
> MUSB_DEVCTL is clear twice: once by da8xx_musb_disable()
> and once musb_generic_disable().
>
> Don't clear MUSB_DEVCTL in da8xx_musb_disable() and use the quirk
> MUSB_PRESERVE_DEVCTL to preseve MUSB_DEVCTL during suspend.
>
> Signed-off-by: Alexandre Bailon <abai...@baylibre.com>
> ---
> drivers/usb/musb/da8xx.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/usb/musb/da8xx.c b/drivers/usb/musb/da8xx.c
> index 905f0d9..90f0c06 100644
> --- a/drivers/usb/musb/da8xx.c
> +++ b/drivers/usb/musb/da8xx.c
> @@ -125,7 +125,6 @@ static void da8xx_musb_disable(struct musb *musb)
> musb_writel(reg_base, DA8XX_USB_INTR_MASK_CLEAR_REG,
> DA8XX_INTR_USB_MASK |
> DA8XX_INTR_TX_MASK | DA8XX_INTR_RX_MASK);
> - musb_writeb(musb->mregs, MUSB_DEVCTL, 0);
> musb_writel(reg_base, DA8XX_USB_END_OF_INTR_REG, 0);
> }
This would be in a separate patch. I have cleaned it up as in [1].
>
> @@ -458,7 +457,8 @@ static inline u8 get_vbus_power(struct device *dev)
> }
>
> static const struct musb_platform_ops da8xx_ops = {
> - .quirks = MUSB_DMA_CPPI | MUSB_INDEXED_EP,
> + .quirks = MUSB_DMA_CPPI | MUSB_INDEXED_EP |
> + MUSB_PRESERVE_DEVCTL,
MUSB_PRESERVE_SESSION would be a better name.
> .init = da8xx_musb_init,
> .exit = da8xx_musb_exit,
>
[1] http://www.spinics.net/lists/linux-usb/msg150857.html
Regards,
-Bin.
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