[U-Boot] twister: usb host support

[Jeroen Hofstee]

Hello Stefano,

The twister always had a fragile usb support in u-boot
in the past. Since some floating patches mentioned
alternating success after usb hub resets, I had a look
if these patches fixed the twister as well, they don't.

Some fiddling around [1] makes the usb work however,
by not attempting to reset the USB hub with gpio_25.
I cannot find any document mentioning gpio_25 though.
Any reason for this usage? It seems better to get rid
of it completely.. Anything against that?

---
Regards,
Jeroen

p.s.
I found by sheer accidence that the usb is behaving
completely normal (after the patch) on rev B1. It is
broken on rev B without the patch and working buggy
with it. On rev B1 + patch the USB to SATA converter
is discovered as well, which I have never seen before.


=== [1] patch to disable the usb reset

The change to port_mode[1] is not needed, but since it is unused,
MODE_UNUSED seems appropriate.


diff --git a/board/technexion/twister/twister.c 
b/board/technexion/twister/twister.c
index a28c704..31cf6c0 100644
--- a/board/technexion/twister/twister.c
+++ b/board/technexion/twister/twister.c
@@ -63,7 +63,7 @@ static const u32 gpmc_XR16L2751[] = {
  #ifdef CONFIG_USB_EHCI
  static struct omap_usbhs_board_data usbhs_bdata = {
      .port_mode[0] = OMAP_EHCI_PORT_MODE_PHY,
-    .port_mode[1] = OMAP_EHCI_PORT_MODE_PHY,
+    .port_mode[1] = OMAP_USBHS_PORT_MODE_UNUSED,
      .port_mode[2] = OMAP_USBHS_PORT_MODE_UNUSED,
  };

@@ -92,9 +92,6 @@ int board_init(void)
      enable_gpmc_cs_config(gpmc_XR16L2751, &gpmc_cfg->cs[3],
          XR16L2751_UART2_BASE, GPMC_SIZE_16M);

-    gpio_request(CONFIG_OMAP_EHCI_PHY1_RESET_GPIO, "USB_PHY1_RESET");
-    gpio_direction_output(CONFIG_OMAP_EHCI_PHY1_RESET_GPIO, 1);
-

=== [2] current usb master (rev B1) ===

twister => usb start
(Re)start USB...
USB0:   USB EHCI 1.00
scanning bus 0 for devices... 3 USB Device(s) found
        scanning usb for storage devices... 1 Storage Device(s) found
twister => usb start
(Re)start USB...
USB0:   USB EHCI 1.00
scanning bus 0 for devices... cannot reset port 1!?
1 USB Device(s) found
        scanning usb for storage devices... 0 Storage Device(s) found
twister => usb start
(Re)start USB...
USB0:   USB EHCI 1.00
scanning bus 0 for devices... 3 USB Device(s) found
        scanning usb for storage devices... 1 Storage Device(s) found
twister => usb start
(Re)start USB...
USB0:   USB EHCI 1.00
scanning bus 0 for devices... cannot reset port 1!?
1 USB Device(s) found
        scanning usb for storage devices... 0 Storage Device(s) found

=== [3] after the patch (rev B1) ===

twister => usb start
(Re)start USB...
USB0:   USB EHCI 1.00
scanning bus 0 for devices... 4 USB Device(s) found
        scanning usb for storage devices... Device NOT ready
    Request Sense returned 02 3A 00
1 Storage Device(s) found

twister => usb tree
USB device tree:
   1  Hub (480 Mb/s, 0mA)
   |  u-boot EHCI Host Controller
   |
   +-2  Hub (480 Mb/s, 100mA)
     |   USB2.0 Hub
     |
     +-3  Mass Storage (480 Mb/s, 96mA)
     |     USB Storage 000000000033
     |
     +-4  Mass Storage (480 Mb/s, 498mA)
          Philips USB Flash Drive 070825AEA237D121


=== [4] after the patch (rev B) ===
Re)start USB...
USB0:   USB EHCI 1.00
scanning bus 0 for devices... 1 USB Device(s) found
        scanning usb for storage devices... 0 Storage Device(s) found
bpp3=> usb start
(Re)start USB...
USB0:   USB EHCI 1.00
scanning bus 0 for devices... 3 USB Device(s) found
        scanning usb for storage devices... 1 Storage Device(s) found
bpp3=> usb start
(Re)start USB...
USB0:   USB EHCI 1.00
scanning bus 0 for devices... cannot reset port 1!?
1 USB Device(s) found
        scanning usb for storage devices... 0 Storage Device(s) found

=== [5]
twister => usb start
(Re)start USB...
USB0:   USB EHCI 1.00
scanning bus 0 for devices... port(0) reset error
cannot reset port 1!?
1 USB Device(s) found
        scanning usb for storage devices... 0 Storage Device(s) found
twister => usb start
(Re)start USB...
USB0:   USB EHCI 1.00
scanning bus 0 for devices... cannot reset port 1!?
1 USB Device(s) found
        scanning usb for storage devices... 0 Storage Device(s) found




      return 0;
  }

diff --git a/include/configs/tam3517-common.h 
b/include/configs/tam3517-common.h
index 2af504b..852bdd7 100644
--- a/include/configs/tam3517-common.h
+++ b/include/configs/tam3517-common.h
@@ -102,7 +102,6 @@
  #define CONFIG_USB_EHCI_OMAP
  #define CONFIG_USB_ULPI
  #define CONFIG_USB_ULPI_VIEWPORT_OMAP
-#define CONFIG_OMAP_EHCI_PHY1_RESET_GPIO    25
  #define CONFIG_SYS_USB_EHCI_MAX_ROOT_PORTS 3
  #define CONFIG_USB_STORAGE