Kever,
On Tue, Aug 5, 2014 at 6:01 PM, Kever Yang <kever.y...@rock-chips.com> wrote:
> According to the "dr_mode", the otg controller can work as
> device role and host role. Some boards always want to use host mode
> and some other boards want to use gadget mode. We use the dts setting
> to set dwc2's mode, rather than fixing it to whatever hardware says.
>
> Signed-off-by: Kever Yang <kever.y...@rock-chips.com>
> Acked-by: Paul Zimmerman <pa...@synopsys.com>
> ---
>
> Changes in v4:
> - From Doug's suggestion:
> -- remove dr_mode init from Kconfig code
> -- change the commit meesage
>
> Changes in v3:
> - fix the odd spacing in dwc2_hsotg struct
> - From Jingoo's suggestion:
> change the commit message
> - add dr_mode init from Kconfig
>
> Changes in v2:
> - put spaces around '+' operator
> - expand the comment for dr_mode
> - handle dr_mode is USB_DR_MODE_OTG
>
> drivers/usb/dwc2/core.c | 18 ++++++++++++++++++
> drivers/usb/dwc2/core.h | 5 +++++
> drivers/usb/dwc2/platform.c | 4 ++++
> 3 files changed, 27 insertions(+)
I think this patch still makes sense even though we don't have a
combined driver yet. Perhaps Paul or Dihn can confirm.
We could potentially do something based on KConfig (like you did in
patch set #3), but it wouldn't really make sense to do that until
after Dihn's work lands.
> diff --git a/drivers/usb/dwc2/core.c b/drivers/usb/dwc2/core.c
> index 27d2c9b..738bec2 100644
> --- a/drivers/usb/dwc2/core.c
> +++ b/drivers/usb/dwc2/core.c
> @@ -118,6 +118,7 @@ static int dwc2_core_reset(struct dwc2_hsotg *hsotg)
> {
> u32 greset;
> int count = 0;
> + u32 gusbcfg;
>
> dev_vdbg(hsotg->dev, "%s()\n", __func__);
>
> @@ -148,6 +149,23 @@ static int dwc2_core_reset(struct dwc2_hsotg *hsotg)
> }
> } while (greset & GRSTCTL_CSFTRST);
>
> + if (hsotg->dr_mode == USB_DR_MODE_HOST) {
> + gusbcfg = readl(hsotg->regs + GUSBCFG);
> + gusbcfg &= ~GUSBCFG_FORCEDEVMODE;
> + gusbcfg |= GUSBCFG_FORCEHOSTMODE;
> + writel(gusbcfg, hsotg->regs + GUSBCFG);
> + } else if (hsotg->dr_mode == USB_DR_MODE_PERIPHERAL) {
> + gusbcfg = readl(hsotg->regs + GUSBCFG);
> + gusbcfg &= ~GUSBCFG_FORCEHOSTMODE;
> + gusbcfg |= GUSBCFG_FORCEDEVMODE;
> + writel(gusbcfg, hsotg->regs + GUSBCFG);
> + } else if (hsotg->dr_mode == USB_DR_MODE_OTG) {
> + gusbcfg = readl(hsotg->regs + GUSBCFG);
> + gusbcfg &= ~GUSBCFG_FORCEHOSTMODE;
> + gusbcfg &= ~GUSBCFG_FORCEDEVMODE;
> + writel(gusbcfg, hsotg->regs + GUSBCFG);
I think the third case here won't be too useful until the combined
driver, but it shouldn't hurt, right?
-Doug
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