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Commit edd74be8 authored by Gregory Herrero's avatar Gregory Herrero Committed by Felipe Balbi
Browse files

usb: dwc2: gadget: add device tree property to enable dma 



* Add an of specific function to parse device node properties.
* Enable dma usage only if device tree property 'g_use_dma' is present.

Tested-by: default avatarRobert Baldyga <r.baldyga@samsung.com>
Acked-by: default avatarPaul Zimmerman <paulz@synopsys.com>
Signed-off-by: default avatarGregory Herrero <gregory.herrero@intel.com>
Signed-off-by: default avatarFelipe Balbi <balbi@ti.com>
parent f5090044

drivers/usb/dwc2/core.h

+2 −0
Original line number Diff line number Diff line
@@ -563,6 +563,7 @@ struct dwc2_hw_params { 
 * @setup:              NAK management for EP0 SETUP

 * @last_rst:           Time of last reset

 * @eps:                The endpoints being supplied to the gadget framework

 * @g_using_dma:          Indicate if dma usage is enabled

 */

struct dwc2_hsotg {

	struct device *dev;
@@ -696,6 +697,7 @@ struct dwc2_hsotg { 
	unsigned int setup:1;

	unsigned long last_rst;

	struct s3c_hsotg_ep *eps;

	u32 g_using_dma;

#endif /* CONFIG_USB_DWC2_PERIPHERAL || CONFIG_USB_DWC2_DUAL_ROLE */

};

drivers/usb/dwc2/gadget.c

+16 −2
Original line number Diff line number Diff line
@@ -85,11 +85,11 @@ static void s3c_hsotg_dump(struct dwc2_hsotg *hsotg); 
 * a core reset. This means we either need to fix the gadgets to take

 * account of DMA alignment, or add bounce buffers (yuerk).

 *

 * Until this issue is sorted out, we always return 'false'.

 * g_using_dma is set depending on dts flag.

 */

static inline bool using_dma(struct dwc2_hsotg *hsotg)

{

	return false;	/* support is not complete */

	return hsotg->g_using_dma;

}



/**
@@ -3402,6 +3402,18 @@ static void s3c_hsotg_delete_debug(struct dwc2_hsotg *hsotg) 
	debugfs_remove(hsotg->debug_root);

}



#ifdef CONFIG_OF

static void s3c_hsotg_of_probe(struct dwc2_hsotg *hsotg)

{

	struct device_node *np = hsotg->dev->of_node;



	/* Enable dma if requested in device tree */

	hsotg->g_using_dma = of_property_read_bool(np, "g-use-dma");

}

#else

static inline void s3c_hsotg_of_probe(struct dwc2_hsotg *hsotg) { }

#endif



/**

 * dwc2_gadget_init - init function for gadget

 * @dwc2: The data structure for the DWC2 driver.
@@ -3419,6 +3431,8 @@ int dwc2_gadget_init(struct dwc2_hsotg *hsotg, int irq) 
	/* Set default UTMI width */

	hsotg->phyif = GUSBCFG_PHYIF16;



	s3c_hsotg_of_probe(hsotg);



	/*

	 * If platform probe couldn't find a generic PHY or an old style

	 * USB PHY, fall back to pdata