From: Gregory Herrero Date: Fri, 9 Jan 2015 12:38:48 +0000 (+0100) Subject: usb: dwc2: gadget: add device tree property to enable dma X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=edd74be83047f439e9507cedbbbef0891f3a9a48;p=linux-beck.git 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: Robert Baldyga Acked-by: Paul Zimmerman Signed-off-by: Gregory Herrero Signed-off-by: Felipe Balbi --- diff --git a/drivers/usb/dwc2/core.h b/drivers/usb/dwc2/core.h index 7db83d058da3..376a008ef437 100644 --- a/drivers/usb/dwc2/core.h +++ b/drivers/usb/dwc2/core.h @@ -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 */ }; diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c index b98622f2092d..c24cb3bef06a 100644 --- a/drivers/usb/dwc2/gadget.c +++ b/drivers/usb/dwc2/gadget.c @@ -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