Messages in this thread Patch in this message | | | Date | Fri, 3 Apr 1998 19:30:56 +0200 (CEST) | From | MOLNAR Ingo <> | Subject | Re: how to slow down IDE ? |
| |
On Fri, 3 Apr 1998, Harald Koenig wrote:
> I need to slow down IDE accesses for a Toshiba notebook with unknown > PCI/IDE chipset
does the attached 2.1.92 patch help? It puts a 10 usecs delay between individual port IO accesses, and a 1 millisec delay between sector accesses ... it's sure an overkill, change the defines if too slow.
--- linux/drivers/block/ide.c.orig Thu Apr 9 07:45:24 1998 +++ linux/drivers/block/ide.c Thu Apr 9 07:48:24 1998 @@ -309,16 +309,16 @@ #endif /* SUPPORT_VLB_SYNC */ insl(IDE_DATA_REG, buffer, wcount); } else { -#if SUPPORT_SLOW_DATA_PORTS - if (drive->slow) { - unsigned short *ptr = (unsigned short *) buffer; - while (wcount--) { - *ptr++ = inw_p(IDE_DATA_REG); - *ptr++ = inw_p(IDE_DATA_REG); - } - } else -#endif /* SUPPORT_SLOW_DATA_PORTS */ - insw(IDE_DATA_REG, buffer, wcount<<1); +#define DELAY_1 10 +#define DELAY_2 1000 + unsigned short *ptr = (unsigned short *) buffer; + while (wcount--) { + *ptr++ = inw_p(IDE_DATA_REG); + udelay(DELAY_1); + *ptr++ = inw_p(IDE_DATA_REG); + udelay(DELAY_1); + } + udelay(DELAY_2); } }
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.rutgers.edu
| |