Re: [PATCH v2] Revert "drm/i915/chv: Set min freq to efficient frequency on chv"

Ville Syrjälä
2016-08-12T06:35:03Z

On Fri, Aug 12, 2016 at 04:52:15PM +0530, deepak.s@linux.intel.com wrote:
> From: Deepak S <deepak.s@linux.intel.com>
>
> With latest Punit FW, vgg input voltag drop falling to minimum is fixed.
> So reverting the WA patch & moving to turbo freq opreation range to [RPn -> RP0]
>
> This reverts commit 5b7c91b78b1ce6663e0f1f037f6cb4d7c9537d44.
>
> commit 5b7c91b78b1ce6663e0f1f037f6cb4d7c9537d44
> Author: Deepak S <deepak.s@linux.intel.com>
> Date: Sat May 9 18:15:46 2015 +0530
>
> drm/i915/chv: Set min freq to efficient frequency on chv
>
> v2: Fix inconsistent return type. (Chris)
>
> Acked-by: Chris Wilson <chris@chris-wilson.co.uk>
> Signed-off-by: Deepak S <deepak.s@linux.intel.com>
> ---
> drivers/gpu/drm/i915/intel_pm.c | 21 +++++++++++++++++++--
> 1 file changed, 19 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index 81ab119..7844bf5 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -5579,6 +5579,24 @@ static int cherryview_rps_guar_freq(struct drm_i915_private *dev_priv)
> return rp1;
> }
>
> +static u32 cherryview_rps_min_freq(struct drm_i915_private *dev_priv)
> +{
> + struct pci_device *pdev = dev_priv->drm.pdev;
> + u32 val, rpn;
> +
> + if (pdev->revision >= 0x20) {
> + val = vlv_punit_read(dev_priv, FB_GFX_FMIN_AT_VMIN_FUSE);
> + rpn = ((val >> FB_GFX_FMIN_AT_VMIN_FUSE_SHIFT) &
> + FB_GFX_FREQ_FUSE_MASK);
> + } else { /* For pre-production hardware */
> + val = vlv_punit_read(dev_priv, PUNIT_GPU_STATUS_REG);
> + rpn = ((val >> PUNIT_GPU_STATIS_GFX_MIN_FREQ_SHIFT) &
> + PUNIT_GPU_STATUS_GFX_MIN_FREQ_MASK);

Please drop the pre-production hw case. We got rid of all pre-production
junk long ago.

> + }
> +
> + return rpn;
> +}
> +
> static int valleyview_rps_guar_freq(struct drm_i915_private *dev_priv)
> {
> u32 val, rp1;
> @@ -5818,8 +5836,7 @@ static void cherryview_init_gt_powersave(struct drm_i915_private *dev_priv)
> intel_gpu_freq(dev_priv, dev_priv->rps.rp1_freq),
> dev_priv->rps.rp1_freq);
>
> - /* PUnit validated range is only [RPe, RP0] */
> - dev_priv->rps.min_freq = dev_priv->rps.efficient_freq;
> + dev_priv->rps.min_freq = cherryview_rps_min_freq(dev_priv);
> DRM_DEBUG_DRIVER("min GPU freq: %d MHz (%u)\n",
> intel_gpu_freq(dev_priv, dev_priv->rps.min_freq),
> dev_priv->rps.min_freq);
> --
> 1.9.1

--
Ville Syrjälä
Intel OTC