Justin,

On Sat, Jul 17, 2021 at 08:39:19AM -0500, Justin Forbes wrote:

On Mon, Jul 12, 2021 at 2:31 AM Greg Kroah-Hartman
[off-list ref] wrote:

quoted

From: Moritz Fischer <mdf@kernel.org>

commit d143825baf15f204dac60acdf95e428182aa3374 upstream.

The ROM load sometimes seems to return an unknown status
(RENESAS_ROM_STATUS_NO_RESULT) instead of success / fail.

If the ROM load indeed failed this leads to failures when trying to
communicate with the controller later on.

Attempt to load firmware using RAM load in those cases.

Fixes: 2478be82de44 ("usb: renesas-xhci: Add ROM loader for uPD720201")
Cc: stable@vger.kernel.org
Cc: Mathias Nyman <mathias.nyman@intel.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Vinod Koul <vkoul@kernel.org>
Tested-by: Vinod Koul <vkoul@kernel.org>
Reviewed-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Moritz Fischer <mdf@kernel.org>
Link: https://lore.kernel.org/r/20210615153758.253572-1-mdf@kernel.org (local)
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

After sending out 5.12.17 for testing, we had a user complain that all
of their USB devices disappeared with the error:

Jul 15 23:18:53 kernel: xhci_hcd 0000:04:00.0: Direct firmware load
for renesas_usb_fw.mem failed with error -2
Jul 15 23:18:53 kernel: xhci_hcd 0000:04:00.0: request_firmware failed: -2
Jul 15 23:18:53 kernel: xhci_hcd: probe of 0000:04:00.0 failed with error -2

This looks like it fails finding the actual firmware file (ENOENT). Any
chance you could give this a whirl on top of the original patch?

diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index 18c2bbddf080..cde8f6f1ec5d 100644
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c

@@ -379,7 +379,11 @@ static int xhci_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
        driver_data = (struct xhci_driver_data *)id->driver_data;
        if (driver_data && driver_data->quirks & XHCI_RENESAS_FW_QUIRK) {
                retval = renesas_xhci_check_request_fw(dev, id);
-               if (retval)
+               /*
+                * If firmware wasn't found there's still a chance this might work without
+                * loading firmware on some systems, so let's try at least.
+                */
+               if (retval && retval != -ENOENT)
                        return retval;
        }

Thanks,
Moritz