kernel/1017: Kernel will not recognize HP 7100i SureStore CD-WRITER

[Mari Donkers <m.donkers@chello.nl>]

>Number:         1017
>Category:       kernel
>Synopsis:       Kernel will not recognize HP 7100i SureStore CD-WRITER
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    bugs
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Dec 20 17:00:01 MST 1999
>Last-Modified:
>Originator:     Mari Donkers
>Organization:
net
>Release:        OpenBSD 2.6
>Environment:

        System      : OpenBSD 2.6
        Architecture: OpenBSD.i386
        Machine     : i386
>Description:
        My (ide) HP 7100i SureStore CD-WRITER is not recognized at
        system boot. My Toshiba CD-ROM drive is recognized correctly.
        With an older RedHat version I also had this problem but it got
        solved. The newer RedHat version has code that retries an
        operation when initialising the CD-WRITER at boot time. In the
        listing below the code that I think is responsible for recognizing
        my HP7100i CD-WRITER is around the 'no response ... resetting drive'
        comment (this is the text that RedHat prints to my screen when it
        recognizes my CD-WRITER).

        The RedHat 'probe' code is taken from ide-probe.c and is listed
        below:

          /*
           * do_probe() has the difficult job of finding a drive if it exists,
           * without getting hung up if it doesn't exist, without trampling on
           * ethernet cards, and without leaving any IRQs dangling to haunt us
later.
           *
           * If a drive is "known" to exist (from CMOS or kernel parameters),
           * but does not respond right away, the probe will "hang in there"
           * for the maximum wait time (about 30 seconds), otherwise it will
           * exit much more quickly.
           *
           * Returns:   0  device was identified
           *            1  device timed-out (no response to identify request)
           *            2  device aborted the command (refused to identify
itself)
           *            3  bad status from device (possible for ATAPI drives)
           *            4  probe was not attempted because failure was obvious
           */
          static int do_probe (ide_drive_t *drive, byte cmd)
          {
                int rc;
                ide_hwif_t *hwif = HWIF(drive);
                if (drive->present) {   /* avoid waiting for inappropriate
probes */
                        if ((drive->media != ide_disk) && (cmd ==
WIN_IDENTIFY))
                                return 4;
                }
          #ifdef DEBUG
                printk("probing for %s: present=%d, media=%d, probetype=%s\n",
                        drive->name, drive->present, drive->media,
                        (cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
          #endif
                SELECT_DRIVE(hwif,drive);
                delay_50ms();
                if (IN_BYTE(IDE_SELECT_REG) != drive->select.all &&
!drive->present) {
                        if (drive->select.b.unit != 0) {
                                SELECT_DRIVE(hwif,&hwif->drives[0]);    /* exit
with drive0 selected */
                                delay_50ms();           /* allow BUSY_STAT to
assert & clear */
                        }
                        return 3;    /* no i/f present: mmm.. this should be a
4 -ml */
                }

                if (OK_STAT(GET_STAT(),READY_STAT,BUSY_STAT)
                 || drive->present || cmd == WIN_PIDENTIFY)
                {
                        if ((rc = try_to_identify(drive,cmd)))   /* send cmd
and wait */
                                rc = try_to_identify(drive,cmd); /* failed: try
again */
                        if (rc == 1 && cmd == WIN_PIDENTIFY && drive->autotune
!= 2) {
                                unsigned long timeout;
                                printk("%s: no response (status = 0x%02x),
resetting drive\n", drive->name, GET_STAT());
                                delay_50ms();
                                OUT_BYTE (drive->select.all, IDE_SELECT_REG);
                                delay_50ms();
                                OUT_BYTE(WIN_SRST, IDE_COMMAND_REG);
                                timeout = jiffies;
                                while ((GET_STAT() & BUSY_STAT) &&
time_before(jiffies, timeout + WAIT_WORSTCASE))
                                        delay_50ms();
                                rc = try_to_identify(drive, cmd);
                        }
                        if (rc == 1)
                                printk("%s: no response (status = 0x%02x)\n",
drive->name, GET_STAT());
                        (void) GET_STAT();              /* ensure drive irq is
clear */
                } else {
                        rc = 3;                         /* not present or maybe
ATAPI */
                }
                if (drive->select.b.unit != 0) {
                        SELECT_DRIVE(hwif,&hwif->drives[0]);    /* exit with
drive0 selected */
                        delay_50ms();
                        (void) GET_STAT();              /* ensure drive irq is
clear */
                }
                return rc;
          }

>How-To-Repeat:
        Boot the system, observe that HP7100i SureStore is not recognized.
>Fix:
        unknown.

>Audit-Trail:
>Unformatted: