Messages in this thread | | | Date | Sat, 26 Jan 2002 19:16:43 -0800 | From | Andrew Morton <> | Subject | Re: [CFT] Bus mastering support for IDE CDROM audio |
| |
"Kevin P. Fleming" wrote: > > When reading from the N drive, get lots of "cdrom_pc_intr: read too > little data 0 < 2352",
OK, thanks Kevin (Dan, Kristian, Grant..)
Seems that some devices simply terminate their DMA in a normal manner, report no errors and don't tell us how much data they transferred. From my reading of the ATA spec, they're allowed to do that - they only need to report the transfer byte count in PIO mode.
Could you please change the code in drivers/ide/ide-cd.c:cdrom_pc_intr() to:
if ((stat & DRQ_STAT) == 0 && len < pc->buflen) { printk(__FUNCTION__ ": read too little data! %d < %d\n", len, pc->buflen); + len = pc->buflen; } pc->buflen -= len; pc->buffer += len;
and let me know if the thing actually reads audio correctly?
Also, please tell me whether that particular drive reads normal ISO filesystems correctly in DMA mode? Thanks.
- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |