[RFC/RFT] ssb: resolve alternate SPROM offset for 14e4:4315

[Michael Buesch <mb@bu3sch.de>]

On Thursday 06 May 2010 07:00:13 Larry Finger wrote:
> This patch and the patch by Gabor entitled "[PATCH] ssb: Implement
> fast powerup delay calculation" are enough to allow the netbook from
> John to work with ssb/b43. As this patch tampers with the SPROM offset for
> 14e4:4315 devices, it should be tested by anyone with an LP PHY that works
> to ensure that it is not killed.
> 
> The essential elements of this patch will also be tested as part of kernel Bug
> #15825.
> 
> Larry
>  
> Index: wireless-testing/drivers/ssb/pci.c
> ===================================================================
> --- wireless-testing.orig/drivers/ssb/pci.c
> +++ wireless-testing/drivers/ssb/pci.c
> @@ -631,8 +631,17 @@ static int ssb_pci_sprom_get(struct ssb_
>  		return -ENODEV;
>  	}
>  
> -	bus->sprom_offset = (bus->chipco.dev->id.revision < 31) ?
> -		SSB_SPROM_BASE1 : SSB_SPROM_BASE31;
> +	/* get SPROM offset: SSB_SPROM_BASE1 except for chipcommon rev >= 31
> +	 * or chip ID is 0x4312 and bit 0x2 is set in chipcommon status
> +	 */
> +	if (bus->chipco.dev->id.revision >= 31)
> +		bus->sprom_offset = SSB_SPROM_BASE31;
> +	else if (bus->chip_id == 0x4312 && (bus->chipco.status & 0x02))
> +		bus->sprom_offset = SSB_SPROM_BASE31;
> +	else
> +		bus->sprom_offset = SSB_SPROM_BASE1;
> +
> +	ssb_dprintk(KERN_INFO PFX "SPROM offset is 0x%x\n", bus->sprom_offset);
>  
>  	buf = kcalloc(SSB_SPROMSIZE_WORDS_R123, sizeof(u16), GFP_KERNEL);
>  	if (!buf)
> Index: wireless-testing/drivers/ssb/scan.c
> ===================================================================
> --- wireless-testing.orig/drivers/ssb/scan.c
> +++ wireless-testing/drivers/ssb/scan.c
> @@ -306,6 +306,11 @@ int ssb_bus_scan(struct ssb_bus *bus,
>  		}
>  		tmp = scan_read32(bus, 0, SSB_CHIPCO_CAP);
>  		bus->chipco.capabilities = tmp;
> +		if (bus->chip_rev >= 11)

This still is wrong. the chip_rev is not the chipcommon core revision.
We already went through this and we decided to read the chipstat later.
Read it in chipcommon init. The bus scan is _way_ too early to read this.

> +			bus->chipco.status = scan_read32(bus, 0,
> +					     SSB_CHIPCO_CHIPSTAT);
> +		else
> +			bus->chipco.status = 0;
>  	} else {
>  		if (bus->bustype == SSB_BUSTYPE_PCI) {
>  			bus->chip_id = pcidev_to_chipid(bus->host_pci);
> 
> 

-- 
Greetings, Michael.