On Wed, Apr 13, 2016 at 04:01:09PM -0300, Paulo Zanoni wrote:
> The DDX driver changes its behavior depending on the value it reads
> from i915.enable_fbc, so sanitize the value in order to allow it to
> know what's going on. It uses this in order to choose the defaults for
> the TearFree option. Before this patch, it would read -1 and always
> assume that FBC was disabled, so it wouldn't force TearFree.
>
> v2: Extract intel_sanitize_fbc_option() (Chris).
>
> Signed-off-by: Paulo Zanoni <paulo.r.zan...@intel.com>
Reviewed-by: Daniel Vetter <daniel.vet...@ffwll.ch>
> ---
> drivers/gpu/drm/i915/intel_fbc.c | 32 ++++++++++++++++++++++++--------
> 1 file changed, 24 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_fbc.c
> b/drivers/gpu/drm/i915/intel_fbc.c
> index fc3c094..c3dffba 100644
> --- a/drivers/gpu/drm/i915/intel_fbc.c
> +++ b/drivers/gpu/drm/i915/intel_fbc.c
> @@ -824,21 +824,14 @@ static bool intel_fbc_can_choose(struct intel_crtc
> *crtc)
> {
> struct drm_i915_private *dev_priv = crtc->base.dev->dev_private;
> struct intel_fbc *fbc = &dev_priv->fbc;
> - bool enable_by_default = IS_HASWELL(dev_priv) ||
> - IS_BROADWELL(dev_priv);
>
> if (intel_vgpu_active(dev_priv->dev)) {
> fbc->no_fbc_reason = "VGPU is active";
> return false;
> }
>
> - if (i915.enable_fbc < 0 && !enable_by_default) {
> - fbc->no_fbc_reason = "disabled per chip default";
> - return false;
> - }
> -
> if (!i915.enable_fbc) {
> - fbc->no_fbc_reason = "disabled per module param";
> + fbc->no_fbc_reason = "disabled per module param or by default";
> return false;
> }
>
> @@ -1223,6 +1216,26 @@ void intel_fbc_init_pipe_state(struct drm_i915_private
> *dev_priv)
> dev_priv->fbc.visible_pipes_mask |= (1 << crtc->pipe);
> }
>
> +/*
> + * The DDX driver changes its behavior depending on the value it reads from
> + * i915.enable_fbc, so sanitize it by translating the default value into
> either
> + * 0 or 1 in order to allow it to know what's going on.
> + *
> + * Notice that this is done at driver initialization and we still allow user
> + * space to change the value during runtime without sanitizing it again. IGT
> + * relies on being able to change i915.enable_fbc at runtime.
> + */
> +static int intel_sanitize_fbc_option(struct drm_i915_private *dev_priv)
> +{
> + if (i915.enable_fbc >= 0)
> + return !!i915.enable_fbc;
> +
> + if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv))
> + return 1;
> +
> + return 0;
> +}
> +
> /**
> * intel_fbc_init - Initialize FBC
> * @dev_priv: the i915 device
> @@ -1240,6 +1253,9 @@ void intel_fbc_init(struct drm_i915_private *dev_priv)
> fbc->active = false;
> fbc->work.scheduled = false;
>
> + i915.enable_fbc = intel_sanitize_fbc_option(dev_priv);
> + DRM_DEBUG_KMS("Sanitized enable_fbc value: %d\n", i915.enable_fbc);
> +
> if (!HAS_FBC(dev_priv)) {
> fbc->no_fbc_reason = "unsupported by this chipset";
> return;
> --
> 2.8.0.rc3
>
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/intel-gfx
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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