Re: [PATCH] Timeout at bootTime with NEC3500A (and others) when inserted a CD in it.

[Marcello Maggioni <hayarms@gmail.com>]

2005/4/26, Marcello Maggioni <hayarms@gmail.com>:
> Hi all,
> 
> I've attached a patch intended for solving boottime issues with this
> and other drives when a CD/DVD is inserted .
> 
> Problem: Some drives (NEC 3500 , TDK 1616N , Mad-dog MD-16XDVD9, RICOH
> MP5163DA , Memorex DVD9 drive and IO-DATA's too for sure) , if a
> CD/DVD is inserted into the tray when the system is booted and if
> before the OS bootup the BIOS checked for the presence of a bootable
> CD/DVD into the drive , during the IDE probe phase the drive may
> result busy and remain so for the next 25/30 seconds . This cause the
> drive to be skipped during the booting phase and not begin usable
> until the next reboot (if the reboot goes well and the drive doesn't
> timeout again ).
> 
> Solution: Rising the timeout time from 10 seconds to 35 seconds
> (during these 35 seconds  every drive should wake up for sure
> according to the tests I've done) .
> 
> Here the simple patch :
> 
> --- drivers/ide/ide-probe.c.orig        2005-04-26 15:04:46.000000000 +0200
> +++ drivers/ide/ide-probe.c     2005-04-26 15:04:14.000000000 +0200
> @@ -638,13 +638,13 @@
>         SELECT_DRIVE(&hwif->drives[0]);
>         hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
>         mdelay(2);
> -       rc = ide_wait_not_busy(hwif, 10000);
> +       rc = ide_wait_not_busy(hwif, 35000);
>         if (rc)
>                 return rc;
>         SELECT_DRIVE(&hwif->drives[1]);
>         hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
>         mdelay(2);
> -       rc = ide_wait_not_busy(hwif, 10000);
> +       rc = ide_wait_not_busy(hwif, 35000);
> 
>         /* Exit function with master reselected (let's be sane) */
>         SELECT_DRIVE(&hwif->drives[0]);
> 
> Greets,
> 
> Maggioni Marcello
> 

I have a question to ask.

What would be the negative effect of rising this timeout time?

Thanks

Bye

Marcello