On Wed, Nov 08, 2017 at 07:14:58PM +0000, Chris Wilson wrote:
> Despite its name intel_init_clock_gating applies both display clock gating
> workarounds; GT mmio workarounds and the occasional GT power context
> workaround. Worse, sometimes it includes a context register workaround
> which we need to apply before we record the default HW state for all
> contexts.
>
> Signed-off-by: Chris Wilson <[email protected]>
> Cc: Ville Syrjälä <[email protected]>
> Cc: Joonas Lahtinen <[email protected]>
> ---
> drivers/gpu/drm/i915/i915_gem.c | 16 ++++++++++++++--
> drivers/gpu/drm/i915/intel_display.c | 2 --
> 2 files changed, 14 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
> index 37586f703c1e..5c0fc78de853 100644
> --- a/drivers/gpu/drm/i915/i915_gem.c
> +++ b/drivers/gpu/drm/i915/i915_gem.c
> @@ -5024,6 +5024,20 @@ int i915_gem_init(struct drm_i915_private *dev_priv)
> intel_init_gt_powersave(dev_priv);
>
> ret = i915_gem_init_hw(dev_priv);
> + if (ret)
> + goto out_unlock;
> +
> + /* Despite its name intel_init_clock_gating applies both display
> + * clock gating workarounds; GT mmio workarounds and the occasional
> + * GT power context workaround. Worse, sometimes it includes a context
> + * register workaround which we need to apply before we record the
> + * default HW state for all contexts.
> + *
> + * FIXME: break up the workarounds and apply them at the right time!
> + */
> + intel_init_clock_gating(dev_priv);
This part lgtm.
> +
> +out_unlock:
> if (ret == -EIO) {
> /* Allow engine initialisation to fail by marking the GPU as
> * wedged. But we only want to do this where the GPU is angry,
> @@ -5035,8 +5049,6 @@ int i915_gem_init(struct drm_i915_private *dev_priv)
> }
> ret = 0;
> }
> -
> -out_unlock:
Is the movement of the label going to adversely affect error handling for
the other functions which already use the label? Or none of them can
return -EIO?
> intel_uncore_forcewake_put(dev_priv, FORCEWAKE_ALL);
> mutex_unlock(&dev_priv->drm.struct_mutex);
>
> diff --git a/drivers/gpu/drm/i915/intel_display.c
> b/drivers/gpu/drm/i915/intel_display.c
> index bc1c6ccde7db..618e912fcaec 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -15197,8 +15197,6 @@ void intel_modeset_gem_init(struct drm_device *dev)
> {
> struct drm_i915_private *dev_priv = to_i915(dev);
>
> - intel_init_clock_gating(dev_priv);
> -
> intel_setup_overlay(dev_priv);
> }
>
> --
> 2.15.0
--
Ville Syrjälä
Intel OTC
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