On Fri, Feb 06, 2015 at 08:26:35PM +0530, akash.g...@intel.com wrote:
> From: Akash Goel <akash.g...@intel.com>
>
> RP Interrupt Up/Down Frequency Limits register (A014) definition
> has changed for SKL. Updated the gen6_rps_limits function as per that
>
> Signed-off-by: Akash Goel <akash.g...@intel.com>
Ah, this is the change I was looking for earlier. Comment below though:
> ---
> drivers/gpu/drm/i915/intel_pm.c | 16 +++++++++++-----
> 1 file changed, 11 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index 215b200..db24b48 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -3623,7 +3623,7 @@ static void ironlake_disable_drps(struct drm_device
> *dev)
> * ourselves, instead of doing a rmw cycle (which might result in us clearing
> * all limits and the gpu stuck at whatever frequency it is at atm).
> */
> -static u32 gen6_rps_limits(struct drm_i915_private *dev_priv, u8 val)
> +static u32 get_rps_limits(struct drm_i915_private *dev_priv, u8 val)
> {
> u32 limits;
>
> @@ -3633,9 +3633,15 @@ static u32 gen6_rps_limits(struct drm_i915_private
> *dev_priv, u8 val)
> * the hw runs at the minimal clock before selecting the desired
> * frequency, if the down threshold expires in that window we will not
> * receive a down interrupt. */
> - limits = dev_priv->rps.max_freq_softlimit << 24;
> - if (val <= dev_priv->rps.min_freq_softlimit)
> - limits |= dev_priv->rps.min_freq_softlimit << 16;
> + if (IS_GEN9(dev_priv->dev)) {
> + limits = (dev_priv->rps.max_freq_softlimit * GEN9_FREQ_SCALER)
> << 23;
> + if (val <= dev_priv->rps.min_freq_softlimit)
> + limits |= (dev_priv->rps.min_freq_softlimit *
> GEN9_FREQ_SCALER) << 14;
I believe the values here are in 16.666 Mhz, the power spec I have gives
examples:
[31:23]=54d: No interrupt if already >=900MHz
[22:14]=18d: No interrupt if already <= 300MHz
and 54 * 16.66.. = 900.
> + } else {
> + limits = dev_priv->rps.max_freq_softlimit << 24;
> + if (val <= dev_priv->rps.min_freq_softlimit)
> + limits |= dev_priv->rps.min_freq_softlimit << 16;
> + }
>
> return limits;
> }
> @@ -3778,7 +3784,7 @@ static void gen6_set_rps(struct drm_device *dev, u8 val)
> /* Make sure we continue to get interrupts
> * until we hit the minimum or maximum frequencies.
> */
> - I915_WRITE(GEN6_RP_INTERRUPT_LIMITS, gen6_rps_limits(dev_priv, val));
> + I915_WRITE(GEN6_RP_INTERRUPT_LIMITS, get_rps_limits(dev_priv, val));
> I915_WRITE(GEN6_PMINTRMSK, gen6_rps_pm_mask(dev_priv, val));
>
> POSTING_READ(GEN6_RPNSWREQ);
> --
> 1.9.2
>
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