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usb: host: xhci-rcar: Don't reload firmware after the completion

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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: 4ac8918f3a ("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: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Link: https://lore.kernel.org/r/20210827063227.81990-1-yoshihiro.shimoda.uh@renesas.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Yoshihiro Shimoda 2021-08-27 15:32:27 +09:00 committed by Greg Kroah-Hartman
parent b7d509a92b
commit 57f3ffdc11
1 changed files with 7 additions and 0 deletions
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7
drivers/usb/host/xhci-rcar.c
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@ -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;