[Intel-gfx] [PATCH] drm/i915: Don't overclock on Haswell

[Jesse Barnes]

On Sat, 23 Mar 2013 17:46:31 -0700
Ben Widawsky <ben at bwidawsk.net> wrote:

> HSW doesn't overclock the same way as IVB or SNB. I do not know about
> VLV, so I've kept that off as well. I'm still working on getting the doc
> updates to explain how we overclock on Haswell.
> 
> Cc: Jesse Barnes <jbarnes at virtuousgeek.org>
> Signed-off-by: Ben Widawsky <ben at bwidawsk.net>
> ---
>  drivers/gpu/drm/i915/intel_pm.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index ce3db2c..9c11dd9 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -2628,7 +2628,7 @@ static void gen6_enable_rps(struct drm_device *dev)
>  		   (IS_HASWELL(dev) ? GEN7_RP_DOWN_IDLE_AVG : GEN6_RP_DOWN_IDLE_CONT));
>  
>  	ret = sandybridge_pcode_write(dev_priv, GEN6_PCODE_WRITE_MIN_FREQ_TABLE, 0);
> -	if (!ret) {
> +	if (!ret && IS_GEN6(dev) || IS_IVYBRIDGE(dev)) {
>  		pcu_mbox = 0;
>  		ret = sandybridge_pcode_read(dev_priv, GEN6_READ_OC_PARAMS, &pcu_mbox);
>  		if (!ret && (pcu_mbox & (1<<31))) { /* OC supported */

This won't affect VLV, since I have a new rps enable function in my
latest set.  But it looks fine.

Reviewed-by: Jesse Barnes <jbarnes at virtuousgeek.org>

-- 
Jesse Barnes, Intel Open Source Technology Center