On Thu, 2020-07-02 at 18:37 +0300, Ville Syrjala wrote:
> From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
>
> The MSG_FBC_REND_STATE register only exists on snb+. For older
> platforms (would also work for snb+) we can simply rewite DSPSURF
> to trigger a flip nuke.
>
> While generally RMW is considered harmful we'll use it here for
> simplicity. And since FBC doesn't exist in i830 we don't have to
> worry about the DSPSURF double buffering hardware fails present
> on that platform.
Did not found a explicit statement about writing DSPSURF will nuke compressed buffer but that makes sense, also checked that MSG_FBC_REND_STATE do not
exist this older platforms.
Reviewed-by: José Roberto de Souza <jose.souza@xxxxxxxxx>
>
> Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/i915/display/intel_fbc.c | 34 +++++++++++++++++++++++-
> 1 file changed, 33 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_fbc.c b/drivers/gpu/drm/i915/display/intel_fbc.c
> index d30c2a389294..036546ce8db8 100644
> --- a/drivers/gpu/drm/i915/display/intel_fbc.c
> +++ b/drivers/gpu/drm/i915/display/intel_fbc.c
> @@ -187,8 +187,30 @@ static bool g4x_fbc_is_active(struct drm_i915_private *dev_priv)
> return intel_de_read(dev_priv, DPFC_CONTROL) & DPFC_CTL_EN;
> }
>
> +static void i8xx_fbc_recompress(struct drm_i915_private *dev_priv)
> +{
> + struct intel_fbc_reg_params *params = &dev_priv->fbc.params;
> + enum i9xx_plane_id i9xx_plane = params->crtc.i9xx_plane;
> +
> + spin_lock_irq(&dev_priv->uncore.lock);
> + intel_de_write_fw(dev_priv, DSPADDR(i9xx_plane),
> + intel_de_read_fw(dev_priv, DSPADDR(i9xx_plane)));
> + spin_unlock_irq(&dev_priv->uncore.lock);
> +}
> +
> +static void i965_fbc_recompress(struct drm_i915_private *dev_priv)
> +{
> + struct intel_fbc_reg_params *params = &dev_priv->fbc.params;
> + enum i9xx_plane_id i9xx_plane = params->crtc.i9xx_plane;
> +
> + spin_lock_irq(&dev_priv->uncore.lock);
> + intel_de_write_fw(dev_priv, DSPSURF(i9xx_plane),
> + intel_de_read_fw(dev_priv, DSPSURF(i9xx_plane)));
> + spin_unlock_irq(&dev_priv->uncore.lock);
> +}
> +
> /* This function forces a CFB recompression through the nuke operation. */
> -static void intel_fbc_recompress(struct drm_i915_private *dev_priv)
> +static void snb_fbc_recompress(struct drm_i915_private *dev_priv)
> {
> struct intel_fbc *fbc = &dev_priv->fbc;
>
> @@ -198,6 +220,16 @@ static void intel_fbc_recompress(struct drm_i915_private *dev_priv)
> intel_de_posting_read(dev_priv, MSG_FBC_REND_STATE);
> }
>
> +static void intel_fbc_recompress(struct drm_i915_private *dev_priv)
> +{
> + if (INTEL_GEN(dev_priv) >= 6)
> + snb_fbc_recompress(dev_priv);
> + else if (INTEL_GEN(dev_priv) >= 4)
> + i965_fbc_recompress(dev_priv);
> + else
> + i8xx_fbc_recompress(dev_priv);
> +}
> +
> static void ilk_fbc_activate(struct drm_i915_private *dev_priv)
> {
> struct intel_fbc_reg_params *params = &dev_priv->fbc.params;
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