ACK: [PATCH Wily SRU] UBUNTU: SAUCE: (noup) cxl: Fix PSL timebase synchronization detection

[Brad Figg]

On Sun, Feb 28, 2016 at 09:42:35AM -0700, tim.gardner at canonical.com wrote:
> From: Frederic Barrat <fbarrat at linux.vnet.ibm.com>
> 
> BugLink: http://bugs.launchpad.net/bugs/1532914
> Downloaded from http://patchwork.ozlabs.org/patch/587545/mbox/
> 
> The PSL timebase synchronization is seemingly failing for
> configuration not including VIRT_CPU_ACCOUNTING_NATIVE. The driver
> shows the following trace in dmesg:
> PSL: Timebase sync: giving up!
> 
> The PSL timebase register is actually syncing correctly, but the cxl
> driver is not detecting it. Fix is to use the proper timebase-to-time
> conversion.
> 
> Signed-off-by: Frederic Barrat <fbarrat at linux.vnet.ibm.com>
> Cc: <stable at vger.kernel.org> # 4.3+
> Acked-by: Michael Neuling <mikey at neuling.org>
> Reviewed-by: Matthew R. Ochs <mrochs at linux.vnet.ibm.com>
> Acked-by: Ian Munsie <imunsie at au1.ibm.com>
> Reviewed-by: Andrew Donnellan <andrew.donnellan at au1.ibm.com>
> Reviewed-by: Vaibhav Jain <vaibhav at linux.vnet.ibm.com>
> Signed-off-by: Tim Gardner <tim.gardner at canonical.com>
> ---
>  drivers/misc/cxl/pci.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/misc/cxl/pci.c b/drivers/misc/cxl/pci.c
> index 85761d7..be2c8e24 100644
> --- a/drivers/misc/cxl/pci.c
> +++ b/drivers/misc/cxl/pci.c
> @@ -414,7 +414,7 @@ static int cxl_setup_psl_timebase(struct cxl *adapter, struct pci_dev *dev)
>  		delta = mftb() - psl_tb;
>  		if (delta < 0)
>  			delta = -delta;
> -	} while (cputime_to_usecs(delta) > 16);
> +	} while (tb_to_ns(delta) > 16000);
>  
>  	return 0;
>  }
> -- 
> 1.9.1
> 
> 
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-- 
Brad Figg brad.figg at canonical.com http://www.canonical.com