Albert Lee wrote:
..
Maybe we can wait a moment and give the slow ATAPI devices some time to set DRQ.
Could you please try if the attached patch works, thanks.
--
albert
--- linux-2.6.20.3/drivers/ata/libata-core.c 2007-03-15 18:03:27.000000000 +0800
+++ linux-2.6.20.3-mod2/drivers/ata/libata-core.c 2007-03-17 01:12:53.000000000 +0800
@@ -4384,6 +4384,19 @@ fsm_start:
*/
poll_next = (qc->tf.flags & ATA_TFLAG_POLLING);
+ /* wait for some slow ATAPI devices to set DRQ */
+ if (unlikely((status & ATA_DRQ) == 0) &&
+ is_atapi_taskfile(&qc->tf)) {
+ int max = 100;
+
+ do {
+ udelay(10);
+ status = ata_chk_status(ap);
+ max--;
+ ata_port_printk(ap, KERN_ERR, "wait for DRQ %d\n", 100-max);
+ } while (((status & ATA_DRQ) == 0) && (max > 0));
+ }
+
/* check device status */
if (unlikely((status & ATA_DRQ) == 0)) {
/* handle BSY=0, DRQ=0 as error */
I patched the above in, and it was NEVER hit.
-ml
-
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