Prefetch needs to be set for some ide devices to work when connected to a ht6560b interface. This was not always done properly, causing a system with a HD and CD on the primary interface to not work properly. Or, in effect, hang hard.
This patch forces prefetch on devices before checking whether it is necessary to change the settings in the interface This patch should also be applied to 2.4. I don't currently have a 2.4 tree around. (also change my email address) Signed-off-by: Jan Evert van Grootheest <[EMAIL PROTECTED]>
--- linux-2.6.git/drivers/ide/legacy/ht6560b.c 2008-02-01 18:50:31.000000000 +0100 +++ linux-2.6.24/drivers/ide/legacy/ht6560b.c 2008-02-18 13:48:59.000000000 +0100 @@ -23,18 +23,21 @@ * "Prefetch" mode bit OFF for ide disks and * ON for anything else. * + * Version 0.08 Need to force prefetch for CDs and other non-disk + * devices. (not sure which devices exactly need + * prefetch) * * HT-6560B EIDE-controller support * To activate controller support use kernel parameter "ide0=ht6560b". * Use hdparm utility to enable PIO mode support. * * Author: Mikko Ala-Fossi <[EMAIL PROTECTED]> - * Jan Evert van Grootheest <[EMAIL PROTECTED]> + * Jan Evert van Grootheest <[EMAIL PROTECTED]> * * Try: http://www.maf.iki.fi/~maf/ht6560b/ */ -#define HT6560B_VERSION "v0.07" +#define HT6560B_VERSION "v0.08" #include <linux/module.h> #include <linux/types.h> @@ -132,15 +135,20 @@ u8 select, timing; local_irq_save(flags); - + select = HT_CONFIG(drive); timing = HT_TIMING(drive); - + + /* + * Need to enforce prefetch sometimes because otherwise + * it'll hang (hard). + */ + if (drive->media != ide_disk || !drive->present) + select |= HT_PREFETCH_MODE; + if (select != current_select || timing != current_timing) { current_select = select; current_timing = timing; - if (drive->media != ide_disk || !drive->present) - select |= HT_PREFETCH_MODE; (void)inb(HT_CONFIG_PORT); (void)inb(HT_CONFIG_PORT); (void)inb(HT_CONFIG_PORT); @@ -190,11 +198,12 @@ outb(HT_TIMING_DEFAULT, 0x1f6); /* IDE_SELECT_REG */ (void) inb(0x1f7); /* IDE_STATUS_REG */ - printk("\nht6560b " HT6560B_VERSION + printk("ht6560b " HT6560B_VERSION ": chipset detected and initialized" #ifdef DEBUG " with debug enabled" #endif + "\n" ); return 1; }
