Re: [PATCH] pata_hpt37x: Fix 2.6.22 clock PLL regression

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Hello.

Alan Cox wrote:

	Just one version of Linux ago
	The PLL code broke - oh no!
	But set the right mode
	And fix up the code
	Makes the PLL timing sync go

/me applauds :-)

Closes-bug: #8791
Signed-off-by: Alan Cox <alan@xxxxxxxxxx>

Acked-by: Sergei Shtylyov <sshtylyov@xxxxxxxxxxxxx>

However, I found it strange that HPT374 against which was that bug report works with 66 MHz DPLL clock -- while I've recently forbidden that clock in the IDE driver because it was causing DMA timeouts.

diff -u --new-file --recursive --exclude-from /usr/src/exclude linux.vanilla-2.6.23rc1/drivers/ata/pata_hpt37x.c linux-2.6.23rc1/drivers/ata/pata_hpt37x.c
--- linux.vanilla-2.6.23rc1/drivers/ata/pata_hpt37x.c	2007-07-23 12:56:11.000000000 +0100
+++ linux-2.6.23rc1/drivers/ata/pata_hpt37x.c	2007-07-23 14:44:39.000000000 +0100
@@ -26,7 +26,7 @@
 #include <linux/libata.h>
#define DRV_NAME "pata_hpt37x"
-#define DRV_VERSION	"0.6.6"
+#define DRV_VERSION	"0.6.7"
struct hpt_clock {
 	u8	xfer_speed;
@@ -1103,17 +1103,17 @@
/* Select the DPLL clock. */
 		pci_write_config_byte(dev, 0x5b, 0x21);
-		pci_write_config_dword(dev, 0x5C, (f_high << 16) | f_low);
+		pci_write_config_dword(dev, 0x5C, (f_high << 16) | f_low | 0x100);

   Heh, was quite a silly mistake. :-)

>  		for(adjust = 0; adjust < 8; adjust++) {
>  			if (hpt37x_calibrate_dpll(dev))
>  				break;
>  			/* See if it'll settle at a fractionally different clock */
> -			if ((adjust & 3) == 3) {
> -				f_low --;
> -				f_high ++;
> -			}
> -			pci_write_config_dword(dev, 0x5C, (f_high << 16) | f_low);
> +			if (adjust & 1)
> +				f_low -= adjust >> 1;
> +			else
> +				f_high += adjust >> 1;
> +			pci_write_config_dword(dev, 0x5C, (f_high << 16) | f_low | 0x100);

OK, I'm seeing that the "oldie but goodie" calibration algrithm has finally found its way to the libata driver too. :-)

MBR, Sergei
-
To unsubscribe from this list: send the line "unsubscribe linux-ide" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html

[Index of Archives]     [Linux Filesystems]     [Linux SCSI]     [Linux RAID]     [Git]     [Kernel Newbies]     [Linux Newbie]     [Security]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Samba]     [Device Mapper]

  Powered by Linux