RE: [PATCH] usb: dwc2: add support for initial state for dual-role mode

[Paul Zimmerman <Paul.Zimmerman@xxxxxxxxxxxx>]

> From: Marek Szyprowski [mailto:m.szyprowski@xxxxxxxxxxx]
> Sent: Wednesday, December 17, 2014 5:50 AM
> 
> DWC2 module on Exynos SoCs is used only as peripheral controller (UDC),
> so add support for selecting default initial state for dual-role mode. The
> default init mode can be overridden by device tree 'dr_mode' property.
> This patch enables to use usb gadget on Exynos SoCs, when DWC2 driver has
> been compiled as 'dual-role driver'.
> 
> Signed-off-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>

Hi Marek,

Why can't you just set dr_mode=USB_DR_MODE_PERIPHERAL in your platform's
device tree data?

-- 
Paul

> ---
>  drivers/usb/dwc2/core.h     |  3 +++
>  drivers/usb/dwc2/platform.c | 62 ++++++++++++++++++++++++++++++++++++++-------
>  2 files changed, 56 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/usb/dwc2/core.h b/drivers/usb/dwc2/core.h
> index 7a70a13..b0fed4e 100644
> --- a/drivers/usb/dwc2/core.h
> +++ b/drivers/usb/dwc2/core.h
> @@ -354,6 +354,7 @@ struct dwc2_core_params {
>  	int reload_ctl;
>  	int ahbcfg;
>  	int uframe_sched;
> +	int default_dr_mode;
>  };
> 
>  /**
> @@ -570,6 +571,8 @@ struct dwc2_hsotg {
>  	struct dwc2_core_params *core_params;
>  	enum usb_otg_state op_state;
>  	enum usb_dr_mode dr_mode;
> +	unsigned int hcd_enabled:1;
> +	unsigned int gadget_enabled:1;
> 
>  	struct phy *phy;
>  	struct usb_phy *uphy;
> diff --git a/drivers/usb/dwc2/platform.c b/drivers/usb/dwc2/platform.c
> index 6a795aa..8abf437 100644
> --- a/drivers/usb/dwc2/platform.c
> +++ b/drivers/usb/dwc2/platform.c
> @@ -76,6 +76,7 @@ static const struct dwc2_core_params params_bcm2835 = {
>  	.reload_ctl			= 0,
>  	.ahbcfg				= 0x10,
>  	.uframe_sched			= 0,
> +	.default_dr_mode		= USB_DR_MODE_OTG,
>  };
> 
>  static const struct dwc2_core_params params_rk3066 = {
> @@ -104,6 +105,36 @@ static const struct dwc2_core_params params_rk3066 = {
>  	.reload_ctl			= -1,
>  	.ahbcfg				= 0x7, /* INCR16 */
>  	.uframe_sched			= -1,
> +	.default_dr_mode		= USB_DR_MODE_OTG,
> +};
> +
> +static const struct dwc2_core_params params_s3c_hsotg = {
> +	.otg_cap			= -1,
> +	.otg_ver			= -1,
> +	.dma_enable			= 0,
> +	.dma_desc_enable		= 0,
> +	.speed				= -1,
> +	.enable_dynamic_fifo		= -1,
> +	.en_multiple_tx_fifo		= -1,
> +	.host_rx_fifo_size		= -1,
> +	.host_nperio_tx_fifo_size	= -1,
> +	.host_perio_tx_fifo_size	= -1,
> +	.max_transfer_size		= -1,
> +	.max_packet_count		= -1,
> +	.host_channels			= -1,
> +	.phy_type			= -1,
> +	.phy_utmi_width			= -1,
> +	.phy_ulpi_ddr			= -1,
> +	.phy_ulpi_ext_vbus		= -1,
> +	.i2c_enable			= -1,
> +	.ulpi_fs_ls			= -1,
> +	.host_support_fs_ls_low_power	= -1,
> +	.host_ls_low_power_phy_clk	= -1,
> +	.ts_dline			= -1,
> +	.reload_ctl			= -1,
> +	.ahbcfg				= -1,
> +	.uframe_sched			= -1,
> +	.default_dr_mode		= USB_DR_MODE_PERIPHERAL,
>  };
> 
>  /**
> @@ -121,8 +152,10 @@ static int dwc2_driver_remove(struct platform_device *dev)
>  {
>  	struct dwc2_hsotg *hsotg = platform_get_drvdata(dev);
> 
> -	dwc2_hcd_remove(hsotg);
> -	s3c_hsotg_remove(hsotg);
> +	if (hsotg->hcd_enabled)
> +		dwc2_hcd_remove(hsotg);
> +	if (hsotg->gadget_enabled)
> +		s3c_hsotg_remove(hsotg);
> 
>  	return 0;
>  }
> @@ -131,7 +164,7 @@ static const struct of_device_id dwc2_of_match_table[] = {
>  	{ .compatible = "brcm,bcm2835-usb", .data = &params_bcm2835 },
>  	{ .compatible = "rockchip,rk3066-usb", .data = &params_rk3066 },
>  	{ .compatible = "snps,dwc2", .data = NULL },
> -	{ .compatible = "samsung,s3c6400-hsotg", .data = NULL},
> +	{ .compatible = "samsung,s3c6400-hsotg", .data = &params_s3c_hsotg },
>  	{},
>  };
>  MODULE_DEVICE_TABLE(of, dwc2_of_match_table);
> @@ -211,15 +244,26 @@ static int dwc2_driver_probe(struct platform_device *dev)
>  		(unsigned long)res->start, hsotg->regs);
> 
>  	hsotg->dr_mode = of_usb_get_dr_mode(dev->dev.of_node);
> +	if (hsotg->dr_mode == USB_DR_MODE_UNKNOWN &&
> +	    params->default_dr_mode > USB_DR_MODE_UNKNOWN)
> +		hsotg->dr_mode = params->default_dr_mode;
> 
>  	spin_lock_init(&hsotg->lock);
>  	mutex_init(&hsotg->init_mutex);
> -	retval = dwc2_gadget_init(hsotg, irq);
> -	if (retval)
> -		return retval;
> -	retval = dwc2_hcd_init(hsotg, irq, params);
> -	if (retval)
> -		return retval;
> +
> +	if (hsotg->dr_mode != USB_DR_MODE_HOST) {
> +		retval = dwc2_gadget_init(hsotg, irq);
> +		if (retval)
> +			return retval;
> +		hsotg->gadget_enabled = 1;
> +	}
> +
> +	if (hsotg->dr_mode != USB_DR_MODE_PERIPHERAL) {
> +		retval = dwc2_hcd_init(hsotg, irq, params);
> +		if (retval)
> +			return retval;
> +		hsotg->hcd_enabled = 1;
> +	}
> 
>  	platform_set_drvdata(dev, hsotg);
> 
> --
> 1.9.2

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