Re: [Patch] [bug #26237] multiple problems with usb devices

["Vladimir 'φ-coder/phcoder' Serbinenko" <phcoder@gmail.com>]

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Aleš Nesrsta wrote:
> I will test the usb.diff soon and than I try to more study EHCI
> specification. On my PC is OHCI detected properly but I have very old
> machine Toshiba Satellite 2140CDS (i586 at 450MHz) with one OHCI only
> interface. I.e. it looks like problem appears only on combined OHCI-EHCI
> interfaces. I have also plan to debug GRUB2 USB support on other, newer
> machine with OHCI-EHCI interfaces.
> I will inform You there if I will discover something interesting...
>
>   
I discovered something. It looks like on Yeeloong the problem is caused
by the skipped step of initialising of timings and power management.
Quick and dirty fix:
=== modified file 'bus/usb/ohci.c'
--- bus/usb/ohci.c      2010-01-20 19:40:30 +0000
+++ bus/usb/ohci.c      2010-04-16 16:32:38 +0000
@@ -91,10 +93,15 @@
   GRUB_OHCI_REG_BULKCURR,
   GRUB_OHCI_REG_DONEHEAD,
   GRUB_OHCI_REG_FRAME_INTERVAL,
+  GRUB_OHCI_REG_PERIODIC_START = 16,
   GRUB_OHCI_REG_RHUBA = 18,
   GRUB_OHCI_REG_RHUBPORT = 21
 } grub_ohci_reg_t;
 
+#define GRUB_OHCI_RHUB_PORT_POWER_MASK 0x300
+#define GRUB_OHCI_RHUB_PORT_ALL_POWERED 0x200
+
+
 static grub_uint32_t
 grub_ohci_readreg32 (struct grub_ohci *o, grub_ohci_reg_t reg)
 {
@@ -166,6 +215,11 @@
   if ((revision & 0xFF) != 0x10)
     goto fail;
 
+  grub_ohci_writereg32 (o, GRUB_OHCI_REG_RHUBA,
+                       (grub_ohci_readreg32 (o, GRUB_OHCI_REG_RHUBA)
+                        & ~GRUB_OHCI_RHUB_PORT_POWER_MASK)
+                       | GRUB_OHCI_RHUB_PORT_ALL_POWERED);
+
   /* Backup the frame interval register.  */
   frame_interval = grub_ohci_readreg32 (o, GRUB_OHCI_REG_FRAME_INTERVAL);
@@ -175,10 +229,14 @@
   grub_dprintf ("ohci", "OHCI reset\n");
 
   /* Restore the frame interval register.  */
+  /* FIXME: is this choice of timings sane?  */
+  frame_interval = (frame_interval & 0xffff) | 0x27780000;
   grub_ohci_writereg32 (o, GRUB_OHCI_REG_FRAME_INTERVAL, frame_interval);
 
+  grub_ohci_writereg32 (o, GRUB_OHCI_REG_PERIODIC_START, 0x257f);
+
   /* Setup the HCCA.  */
-  grub_ohci_writereg32 (o, GRUB_OHCI_REG_HCCA, (grub_uint32_t) o->hcca);
+  grub_ohci_writereg32 (o, GRUB_OHCI_REG_HCCA, (grub_uint32_t) o->hcca);
   grub_dprintf ("ohci", "OHCI HCCA\n");
 
   /* Enable the OHCI.  */
 

> Best regards
> Ales
>
>
>
> _______________________________________________
> Grub-devel mailing list
> Grub-devel@gnu.org
> http://lists.gnu.org/mailman/listinfo/grub-devel
>
>   


-- 
Regards
Vladimir 'φ-coder/phcoder' Serbinenko



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