> From: Marek Szyprowski [mailto:m.szyprow...@samsung.com]
> Sent: Monday, October 20, 2014 3:46 AM
>
> This patch changes s3c_hsotg_core_init function to leave hardware in
> soft disconnect mode, so the moment of coupling the hardware to the usb
> bus can be later controlled by the separate functions for enabling and
> disabling soft disconnect mode. This patch is a preparation to rework
> pullup() method.
>
> Signed-off-by: Marek Szyprowski <m.szyprow...@samsung.com>
> ---
> drivers/usb/dwc2/gadget.c | 22 +++++++++++++++++-----
> 1 file changed, 17 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c
> index c1dad46bbbdd..5eb2473031c4 100644
> --- a/drivers/usb/dwc2/gadget.c
> +++ b/drivers/usb/dwc2/gadget.c
> @@ -2124,7 +2124,7 @@ static int s3c_hsotg_corereset(struct s3c_hsotg *hsotg)
> *
> * Issue a soft reset to the core, and await the core finishing it.
> */
> -static void s3c_hsotg_core_init(struct s3c_hsotg *hsotg)
> +static void s3c_hsotg_core_init_disconnected(struct s3c_hsotg *hsotg)
> {
> s3c_hsotg_corereset(hsotg);
>
> @@ -2241,14 +2241,23 @@ static void s3c_hsotg_core_init(struct s3c_hsotg
> *hsotg)
> readl(hsotg->regs + DOEPCTL0));
>
> /* clear global NAKs */
> - writel(DCTL_CGOUTNAK | DCTL_CGNPINNAK,
> + writel(DCTL_CGOUTNAK | DCTL_CGNPINNAK | DCTL_SFTDISCON,
> hsotg->regs + DCTL);
>
> /* must be at-least 3ms to allow bus to see disconnect */
> mdelay(3);
>
> hsotg->last_rst = jiffies;
> +}
> +
> +static void s3c_hsotg_core_disconnect(struct s3c_hsotg *hsotg)
> +{
> + /* set the soft-disconnect bit */
> + __orr32(hsotg->regs + DCTL, DCTL_SFTDISCON);
I'm not really happy with adding more uses of these __orr32, __bic32
functions. When I first saw those, I went 'wtf?", because with the
assembly-sounding names, they look like some special ARM instruction
or something.
But I guess cleaning that up can wait for a future patch series, so OK.
> +}
>
> +static void s3c_hsotg_core_connect(struct s3c_hsotg *hsotg)
> +{
> /* remove the soft-disconnect and let's go */
> __bic32(hsotg->regs + DCTL, DCTL_SFTDISCON);
> }
> @@ -2348,7 +2357,8 @@ irq_retry:
> kill_all_requests(hsotg, &hsotg->eps[0],
> -ECONNRESET, true);
>
> - s3c_hsotg_core_init(hsotg);
> + s3c_hsotg_core_init_disconnected(hsotg);
> + s3c_hsotg_core_connect(hsotg);
> }
> }
> }
> @@ -2981,7 +2991,8 @@ static int s3c_hsotg_pullup(struct usb_gadget *gadget,
> int is_on)
> if (is_on) {
> s3c_hsotg_phy_enable(hsotg);
> clk_enable(hsotg->clk);
> - s3c_hsotg_core_init(hsotg);
> + s3c_hsotg_core_init_disconnected(hsotg);
> + s3c_hsotg_core_connect(hsotg);
> } else {
> clk_disable(hsotg->clk);
> s3c_hsotg_phy_disable(hsotg);
> @@ -3668,7 +3679,8 @@ static int s3c_hsotg_resume(struct platform_device
> *pdev)
>
> spin_lock_irqsave(&hsotg->lock, flags);
> s3c_hsotg_phy_enable(hsotg);
> - s3c_hsotg_core_init(hsotg);
> + s3c_hsotg_core_init_disconnected(hsotg);
> + s3c_hsotg_core_connect(hsotg);
> spin_unlock_irqrestore(&hsotg->lock, flags);
>
> return ret;
Acked-by: Paul Zimmerman <pa...@synopsys.com>
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