Hi Svetoslav,
On Wed, Feb 13, 2013 at 11:38:55PM +0200, Svetoslav Neykov wrote:
> The chipidea controller in the AR933x SOC supports both host and device modes but not OTG.
> Which USB mode is used depends on a pin state (GIPO13) during boot - HIGH for host, LOW for device mode.
> Currently if both host and device modes are available, the code assumes OTG support. Add flags to allow
> the platform code for force a specific mode based on the pin state.
>
> Signed-off-by: Svetoslav Neykov <svetoslav@xxxxxxxxxxx>
> ---
> drivers/usb/chipidea/core.c | 22 +++++++++++++++++-----
> include/linux/usb/chipidea.h | 2 ++
> 2 files changed, 19 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c
> index 3cefb4c..85c72e5 100644
> --- a/drivers/usb/chipidea/core.c
> +++ b/drivers/usb/chipidea/core.c
> @@ -398,6 +398,8 @@ static int ci_hdrc_probe(struct platform_device *pdev)
> struct resource *res;
> void __iomem *base;
> int ret;
> + bool force_host_mode;
> + bool force_device_mode;
>
> if (!dev->platform_data) {
> dev_err(dev, "platform data missing\n");
> @@ -459,21 +461,31 @@ static int ci_hdrc_probe(struct platform_device *pdev)
> if (ret)
> dev_info(dev, "doesn't support gadget\n");
>
> - if (!ci->roles[CI_ROLE_HOST] && !ci->roles[CI_ROLE_GADGET]) {
> + force_host_mode = ci->platdata->flags & CI13XXX_FORCE_HOST_MODE;
> + force_device_mode = ci->platdata->flags & CI13XXX_FORCE_DEVICE_MODE;
> + if ((!ci->roles[CI_ROLE_HOST] && !ci->roles[CI_ROLE_GADGET]) ||
> + (force_host_mode && !ci->roles[CI_ROLE_HOST]) ||
> + (force_device_mode && !ci->roles[CI_ROLE_GADGET])) {
> dev_err(dev, "no supported roles\n");
> ret = -ENODEV;
> goto rm_wq;
> }
>
> - if (ci->roles[CI_ROLE_HOST] && ci->roles[CI_ROLE_GADGET]) {
> + if (!force_host_mode && !force_device_mode &&
> + ci->roles[CI_ROLE_HOST] && ci->roles[CI_ROLE_GADGET]) {
> ci->is_otg = true;
> /* ID pin needs 1ms debouce time, we delay 2ms for safe */
> mdelay(2);
> ci->role = ci_otg_role(ci);
> } else {
> - ci->role = ci->roles[CI_ROLE_HOST]
> - ? CI_ROLE_HOST
> - : CI_ROLE_GADGET;
> + if (force_host_mode)
> + ci->role = CI_ROLE_HOST;
> + else if (force_device_mode)
> + ci->role = CI_ROLE_GADGET;
> + else
> + ci->role = ci->roles[CI_ROLE_HOST]
> + ? CI_ROLE_HOST
> + : CI_ROLE_GADGET;
> }
>
> ret = ci_role_start(ci, ci->role);
> diff --git a/include/linux/usb/chipidea.h b/include/linux/usb/chipidea.h
> index 544825d..e6f44d2 100644
> --- a/include/linux/usb/chipidea.h
> +++ b/include/linux/usb/chipidea.h
> @@ -19,6 +19,8 @@ struct ci13xxx_platform_data {
> #define CI13XXX_REQUIRE_TRANSCEIVER BIT(1)
> #define CI13XXX_PULLUP_ON_VBUS BIT(2)
> #define CI13XXX_DISABLE_STREAMING BIT(3)
> +#define CI13XXX_FORCE_HOST_MODE BIT(5)
> +#define CI13XXX_FORCE_DEVICE_MODE BIT(6)
>
> #define CI13XXX_CONTROLLER_RESET_EVENT 0
> #define CI13XXX_CONTROLLER_STOPPED_EVENT 1
We already discuss such functionality:
https://patchwork-mail1.kernel.org/patch/2092051/
Regards,
Michael
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