linux-kernel - [PATCH 5.12 022/700] usb: renesas-xhci: Fix handling of unknown ROM state

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Date:   Mon, 12 Jul 2021 08:01:45 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Mathias Nyman <mathias.nyman@...el.com>,
        Vinod Koul <vkoul@...nel.org>, Moritz Fischer <mdf@...nel.org>
Subject: [PATCH 5.12 022/700] usb: renesas-xhci: Fix handling of unknown ROM state

From: Moritz Fischer <mdf@...nel.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@...r.kernel.org
Cc: Mathias Nyman <mathias.nyman@...el.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Vinod Koul <vkoul@...nel.org>
Tested-by: Vinod Koul <vkoul@...nel.org>
Reviewed-by: Vinod Koul <vkoul@...nel.org>
Signed-off-by: Moritz Fischer <mdf@...nel.org>
Link: https://lore.kernel.org/r/20210615153758.253572-1-mdf@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/usb/host/xhci-pci-renesas.c |   16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

--- a/drivers/usb/host/xhci-pci-renesas.c
+++ b/drivers/usb/host/xhci-pci-renesas.c
@@ -207,7 +207,8 @@ static int renesas_check_rom_state(struc
 			return 0;
 
 		case RENESAS_ROM_STATUS_NO_RESULT: /* No result yet */
-			return 0;
+			dev_dbg(&pdev->dev, "Unknown ROM status ...\n");
+			break;
 
 		case RENESAS_ROM_STATUS_ERROR: /* Error State */
 		default: /* All other states are marked as "Reserved states" */
@@ -224,13 +225,12 @@ static int renesas_fw_check_running(stru
 	u8 fw_state;
 	int err;
 
-	/* Check if device has ROM and loaded, if so skip everything */
-	err = renesas_check_rom(pdev);
-	if (err) { /* we have rom */
-		err = renesas_check_rom_state(pdev);
-		if (!err)
-			return err;
-	}
+	/*
+	 * Only if device has ROM and loaded FW we can skip loading and
+	 * return success. Otherwise (even unknown state), attempt to load FW.
+	 */
+	if (renesas_check_rom(pdev) && !renesas_check_rom_state(pdev))
+		return 0;
 
 	/*
 	 * Test if the device is actually needing the firmware. As most