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Commit 61d8040e authored by Maya Erez's avatar Maya Erez
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usb: dwc3: Do not set half-full elastic buffer 



On some platforms setting of half-full elastic buffer will cause data
corruption and hence we need to avoid this setting.
Disable the usage of the default setting of half-full elastic buffer
towards SolvNet Case 8000626044.

Change-Id: I113c6e0602e057496d5e84fc2f6a3f59d12efc98
Signed-off-by: default avatarMaya Erez <merez@codeaurora.org>
parent be057e1d

Documentation/devicetree/bindings/usb/dwc3.txt

+2 −0
Original line number Diff line number Diff line
@@ -14,6 +14,8 @@ Required properties: 
Optional properties:

 - tx-fifo-resize: determines if the FIFO *has* to be reallocated.

 - host-only-mode: if present then dwc3 should be run in HOST only mode.

 - nominal-elastic-buffer: When set, the nominal elastic buffer setting

	is used. By default, the half-full setting is used.



This is usually a subnode to DWC3 glue to which it is connected.

drivers/usb/dwc3/core.c

+8 −3
Original line number Diff line number Diff line
@@ -442,9 +442,11 @@ static int dwc3_core_init(struct dwc3 *dwc) 
	 * it results in high link errors and could cause SS mode transfer

	 * failure.

	 */

	if (!dwc->nominal_elastic_buffer) {

		reg = dwc3_readl(dwc->regs, DWC3_GUSB3PIPECTL(0));

		reg &= ~DWC3_GUSB3PIPECTL_ELASTIC_BUF_MODE;

		dwc3_writel(dwc->regs, DWC3_GUSB3PIPECTL(0), reg);

	}



	return 0;
@@ -626,6 +628,9 @@ static int dwc3_probe(struct platform_device *pdev) 
		}

	}



	dwc->nominal_elastic_buffer = of_property_read_bool(node,

			"nominal-elastic-buffer");



	ret = dwc3_core_init(dwc);

	if (ret) {

		dev_err(dev, "failed to initialize core\n");

drivers/usb/dwc3/core.h

+2 −0
Original line number Diff line number Diff line
@@ -823,6 +823,8 @@ struct dwc3 { 
	void (*notify_event) (struct dwc3 *, unsigned);

	int			tx_fifo_size;

	bool			tx_fifo_reduced;



	bool			nominal_elastic_buffer;

};



/* -------------------------------------------------------------------------- */