usb: dwc3: core: add a event buffer cache (d9fa4c63) · Commits · 戴 / test

This extra buffer will be used so we can copy triggered events from our event buffer to this cache and process all of them later in bottom half handler. We need this in order to implement a workaround for a known erratum in recent DWC3 release. Signed-off-by:

John Youn <johnyoun@synopsys.com> Signed-off-by:

Felipe Balbi <felipe.balbi@linux.intel.com>

drivers/usb/dwc3/core.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -224,6 +224,10 @@ static struct dwc3_event_buffer dwc3_alloc_one_event_buffer(struct dwc3 dwc,

		evt->dwc = dwc;
		evt->length = length;
		evt->cache = devm_kzalloc(dwc->dev, length, GFP_KERNEL);
		if (!evt->cache)
		return ERR_PTR(-ENOMEM);

		evt->buf = dma_alloc_coherent(dwc->dev, length,
		&evt->dma, GFP_KERNEL);
		if (!evt->buf)

drivers/usb/dwc3/core.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -472,6 +472,7 @@ struct dwc3_trb;
		/**
		* struct dwc3_event_buffer - Software event buffer representation
		* @buf: _THE_ buffer
		* @cache: The buffer cache used in the threaded interrupt
		* @length: size of this buffer
		* @lpos: event offset
		* @count: cache of last read event count register
		@@ -481,6 +482,7 @@ struct dwc3_trb;
		*/
		struct dwc3_event_buffer {
		void *buf;
		void *cache;
		unsigned length;
		unsigned int lpos;
		unsigned int count;

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