target/linux/generic/backport-5.10/810-v5.13-usb-ehci-add-spurious-flag-to-disable-overcurrent-ch.patch

   1 From 2d5ba37461013253d2ff0a3641b727fd32ea97a9 Mon Sep 17 00:00:00 2001
   2 From: Florian Fainelli <florian@openwrt.org>
   3 Date: Tue, 23 Feb 2021 18:44:53 +0100
   4 Subject: [PATCH 1/3] usb: ehci: add spurious flag to disable overcurrent
   5  checking
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   9
  10 This patch adds an ignore_oc flag which can be set by EHCI controller
  11 not supporting or wanting to disable overcurrent checking. The EHCI
  12 platform data in include/linux/usb/ehci_pdriver.h is also augmented to
  13 take advantage of this new flag.
  14
  15 Signed-off-by: Florian Fainelli <florian@openwrt.org>
  16 Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
  17 Link: https://lore.kernel.org/r/20210223174455.1378-2-noltari@gmail.com
  18 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  19 ---
  20  drivers/usb/host/ehci-hcd.c      | 2 +-
  21  drivers/usb/host/ehci-hub.c      | 4 ++--
  22  drivers/usb/host/ehci-platform.c | 2 ++
  23  drivers/usb/host/ehci.h          | 1 +
  24  include/linux/usb/ehci_pdriver.h | 1 +
  25  5 files changed, 7 insertions(+), 3 deletions(-)
  26
  27 --- a/drivers/usb/host/ehci-hcd.c
  28 +++ b/drivers/usb/host/ehci-hcd.c
  29 @@ -660,7 +660,7 @@ static int ehci_run (struct usb_hcd *hcd
  30                 "USB %x.%x started, EHCI %x.%02x%s\n",
  31                 ((ehci->sbrn & 0xf0)>>4), (ehci->sbrn & 0x0f),
  32                 temp >> 8, temp & 0xff,
  33 -               ignore_oc ? ", overcurrent ignored" : "");
  34 +               (ignore_oc || ehci->spurious_oc) ? ", overcurrent ignored" : "");
  35
  36         ehci_writel(ehci, INTR_MASK,
  37                     &ehci->regs->intr_enable); /* Turn On Interrupts */
  38 --- a/drivers/usb/host/ehci-hub.c
  39 +++ b/drivers/usb/host/ehci-hub.c
  40 @@ -643,7 +643,7 @@ ehci_hub_status_data (struct usb_hcd *hc
  41          * always set, seem to clear PORT_OCC and PORT_CSC when writing to
  42          * PORT_POWER; that's surprising, but maybe within-spec.
  43          */
  44 -       if (!ignore_oc)
  45 +       if (!ignore_oc && !ehci->spurious_oc)
  46                 mask = PORT_CSC | PORT_PEC | PORT_OCC;
  47         else
  48                 mask = PORT_CSC | PORT_PEC;
  49 @@ -1013,7 +1013,7 @@ int ehci_hub_control(
  50                 if (temp & PORT_PEC)
  51                         status |= USB_PORT_STAT_C_ENABLE << 16;
  52
  53 -               if ((temp & PORT_OCC) && !ignore_oc){
  54 +               if ((temp & PORT_OCC) && (!ignore_oc && !ehci->spurious_oc)){
  55                         status |= USB_PORT_STAT_C_OVERCURRENT << 16;
  56
  57                         /*
  58 --- a/drivers/usb/host/ehci-platform.c
  59 +++ b/drivers/usb/host/ehci-platform.c
  60 @@ -333,6 +333,8 @@ static int ehci_platform_probe(struct pl
  61                 hcd->has_tt = 1;
  62         if (pdata->reset_on_resume)
  63                 priv->reset_on_resume = true;
  64 +       if (pdata->spurious_oc)
  65 +               ehci->spurious_oc = 1;
  66
  67  #ifndef CONFIG_USB_EHCI_BIG_ENDIAN_MMIO
  68         if (ehci->big_endian_mmio) {
  69 --- a/drivers/usb/host/ehci.h
  70 +++ b/drivers/usb/host/ehci.h
  71 @@ -219,6 +219,7 @@ struct ehci_hcd {                   /* one per controlle
  72         unsigned                need_oc_pp_cycle:1; /* MPC834X port power */
  73         unsigned                imx28_write_fix:1; /* For Freescale i.MX28 */
  74         unsigned                is_aspeed:1;
  75 +       unsigned                spurious_oc:1;
  76
  77         /* required for usb32 quirk */
  78         #define OHCI_CTRL_HCFS          (3 << 6)
  79 --- a/include/linux/usb/ehci_pdriver.h
  80 +++ b/include/linux/usb/ehci_pdriver.h
  81 @@ -50,6 +50,7 @@ struct usb_ehci_pdata {
  82         unsigned        no_io_watchdog:1;
  83         unsigned        reset_on_resume:1;
  84         unsigned        dma_mask_64:1;
  85 +       unsigned        spurious_oc:1;
  86
  87         /* Turn on all power and clocks */
  88         int (*power_on)(struct platform_device *pdev);