target/linux/bcm27xx/patches-6.1/950-0520-xhci-constrain-XHCI_VLI_HUB_TT_QUIRK-to-old-firmware.patch

   1 From b5a62178cd25c598612036858df5934c4140d242 Mon Sep 17 00:00:00 2001
   2 From: Jonathan Bell <jonathan@raspberrypi.com>
   3 Date: Fri, 16 Dec 2022 15:18:21 +0000
   4 Subject: [PATCH] xhci: constrain XHCI_VLI_HUB_TT_QUIRK to old firmware
   5  versions
   6
   7 VLI have a firmware update for the VL805 which resolves the incorrect
   8 frame time calculation in the hub's TT. Limit applying the quirk to
   9 known-bad firmwares.
  10
  11 Signed-off-by: Jonathan Bell <jonathan@raspberrypi.com>
  12 ---
  13  drivers/usb/host/xhci-pci.c | 15 ++++++++++++++-
  14  1 file changed, 14 insertions(+), 1 deletion(-)
  15
  16 --- a/drivers/usb/host/xhci-pci.c
  17 +++ b/drivers/usb/host/xhci-pci.c
  18 @@ -27,6 +27,8 @@
  19  #define SPARSE_DISABLE_BIT     17
  20  #define SPARSE_CNTL_ENABLE     0xC12C
  21
  22 +#define VL805_FW_VER_0138C0    0x0138C0
  23 +
  24  /* Device for a quirk */
  25  #define PCI_VENDOR_ID_FRESCO_LOGIC     0x1b73
  26  #define PCI_DEVICE_ID_FRESCO_LOGIC_PDK 0x1000
  27 @@ -104,6 +106,16 @@ static int xhci_pci_reinit(struct xhci_h
  28         return 0;
  29  }
  30
  31 +static u32 xhci_vl805_get_fw_version(struct pci_dev *dev)
  32 +{
  33 +       int ret;
  34 +       u32 ver;
  35 +
  36 +       ret = pci_read_config_dword(dev, 0x50, &ver);
  37 +       /* Default to a fw version of 0 instead of ~0 */
  38 +       return ret ? 0 : ver;
  39 +}
  40 +
  41  static void xhci_pci_quirks(struct device *dev, struct xhci_hcd *xhci)
  42  {
  43         struct pci_dev                  *pdev = to_pci_dev(dev);
  44 @@ -298,7 +310,8 @@ static void xhci_pci_quirks(struct devic
  45                 xhci->quirks |= XHCI_AVOID_DQ_ON_LINK;
  46                 xhci->quirks |= XHCI_VLI_TRB_CACHE_BUG;
  47                 xhci->quirks |= XHCI_VLI_SS_BULK_OUT_BUG;
  48 -               xhci->quirks |= XHCI_VLI_HUB_TT_QUIRK;
  49 +               if (xhci_vl805_get_fw_version(pdev) < VL805_FW_VER_0138C0)
  50 +                       xhci->quirks |= XHCI_VLI_HUB_TT_QUIRK;
  51         }
  52
  53         if (pdev->vendor == PCI_VENDOR_ID_ASMEDIA &&