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[PATCH] HPT37x: read f_CNT saved by BIOS from port

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The undocumented register BIOS uses for saving f_CNT seems to only be
mapped to I/O space while all the other HPT3xx regs are dual-mapped.  Looks
like another HighPoint's dirty trick.  With this patch, the deadly kernel
oops on the cards having the modern HighPoint BIOSes is now at last gone!

Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Cc: Bartlomiej Zolnierkiewicz <B.Zolnierkiewicz@elka.pw.edu.pl>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Sergei Shtylyov 2006-12-13 00:35:53 -08:00 committed by Linus Torvalds
parent 26c068daf0
commit f13c152684
1 changed files with 3 additions and 3 deletions
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6
drivers/ide/pci/hpt366.c
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@ -1035,14 +1035,14 @@ static void __devinit hpt37x_clocking(ide_hwif_t *hwif)
* First try reading the register in which the HighPoint BIOS * First try reading the register in which the HighPoint BIOS
* saves f_CNT value before reprogramming the DPLL from its * saves f_CNT value before reprogramming the DPLL from its
* default setting (which differs for the various chips). * default setting (which differs for the various chips).
* NOTE: This register is only accessible via I/O space.
*
* In case the signature check fails, we'll have to resort to * In case the signature check fails, we'll have to resort to
* reading the f_CNT register itself in hopes that nobody has * reading the f_CNT register itself in hopes that nobody has
* touched the DPLL yet... * touched the DPLL yet...
*/ */
pci_read_config_dword(dev, 0x70, &temp); temp = inl(pci_resource_start(dev, 4) + 0x90);
if ((temp & 0xFFFFF000) != 0xABCDE000) { if ((temp & 0xFFFFF000) != 0xABCDE000) {
int i;
printk(KERN_WARNING "HPT37X: no clock data saved by BIOS\n"); printk(KERN_WARNING "HPT37X: no clock data saved by BIOS\n");
/* Calculate the average value of f_CNT */ /* Calculate the average value of f_CNT */