From: Sergei Shtylyov Date: Wed, 13 Dec 2006 08:35:53 +0000 (-0800) Subject: [PATCH] HPT37x: read f_CNT saved by BIOS from port X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=f13c152684a7f99ead26525270ed3e28a1d2467f;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git [PATCH] HPT37x: read f_CNT saved by BIOS from port 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 Cc: Bartlomiej Zolnierkiewicz Cc: Alan Cox Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/drivers/ide/pci/hpt366.c b/drivers/ide/pci/hpt366.c index 9fd50801d382..08119da06d54 100644 --- a/drivers/ide/pci/hpt366.c +++ b/drivers/ide/pci/hpt366.c @@ -1035,14 +1035,14 @@ static void __devinit hpt37x_clocking(ide_hwif_t *hwif) * First try reading the register in which the HighPoint BIOS * saves f_CNT value before reprogramming the DPLL from its * 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 * reading the f_CNT register itself in hopes that nobody has * touched the DPLL yet... */ - pci_read_config_dword(dev, 0x70, &temp); + temp = inl(pci_resource_start(dev, 4) + 0x90); if ((temp & 0xFFFFF000) != 0xABCDE000) { - int i; - printk(KERN_WARNING "HPT37X: no clock data saved by BIOS\n"); /* Calculate the average value of f_CNT */