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Commit 00b63255 authored by Yoshihiro Shimoda's avatar Yoshihiro Shimoda Committed by Greg Kroah-Hartman
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usb: host: xhci-rcar: Don't reload firmware after the completion 



commit 57f3ffdc11143f56f1314972fe86fe17a0dcde85 upstream.

According to the datasheet, "Upon the completion of FW Download,
there is no need to write or reload FW.". Otherwise, it's possible
to cause unexpected behaviors. So, adds such a condition.

Fixes: 4ac8918f ("usb: host: xhci-plat: add support for the R-Car H2 and M2 xHCI controllers")
Cc: stable@vger.kernel.org # v3.17+
Signed-off-by: default avatarYoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Link: https://lore.kernel.org/r/20210827063227.81990-1-yoshihiro.shimoda.uh@renesas.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 7a74ae30

drivers/usb/host/xhci-rcar.c

+7 −0
Original line number Diff line number Diff line
@@ -134,6 +134,13 @@ static int xhci_rcar_download_firmware(struct usb_hcd *hcd) 
	const struct soc_device_attribute *attr;

	const char *firmware_name;



	/*

	 * According to the datasheet, "Upon the completion of FW Download,

	 * there is no need to write or reload FW".

	 */

	if (readl(regs + RCAR_USB3_DL_CTRL) & RCAR_USB3_DL_CTRL_FW_SUCCESS)

		return 0;



	attr = soc_device_match(rcar_quirks_match);

	if (attr)

		quirks = (uintptr_t)attr->data;