On Mon, Jan 21, 2019 at 05:31:43PM +0200, Ville Syrjala wrote:
> From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
>
> The code managing the dbuf slices is borked and needs some
> real work to fix. In the meantime let's just stop using the
> second slice.
>
> Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Reviewed-by: Imre Deak <imre.deak@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/intel_pm.c | 10 ++++++++--
> 1 file changed, 8 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index 8b63afa3a221..1e41c899ffe2 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -3618,7 +3618,8 @@ static u8 intel_enabled_dbuf_slices_num(struct drm_i915_private *dev_priv)
> enabled_slices = 1;
>
> /* Gen prior to GEN11 have only one DBuf slice */
> - if (INTEL_GEN(dev_priv) < 11)
> + /* FIXME dbuf slice code is broken: see intel_get_ddb_size() */
> + if (1 || INTEL_GEN(dev_priv) < 11)
> return enabled_slices;
>
> if (I915_READ(DBUF_CTL_S2) & DBUF_POWER_STATE)
> @@ -3827,8 +3828,13 @@ static u16 intel_get_ddb_size(struct drm_i915_private *dev_priv,
>
> /*
> * 12GB/s is maximum BW supported by single DBuf slice.
> + *
> + * FIXME dbuf slice code is broken:
> + * - must wait for planes to stop using the slice before powering it off
> + * - plane straddling both slices is illegal in multi-pipe scenarios
> + * - should validate we stay within the hw bandwidth limits
> */
> - if (num_active > 1 || total_data_bw >= GBps(12)) {
> + if (0 && (num_active > 1 || total_data_bw >= GBps(12))) {
> ddb->enabled_slices = 2;
> } else {
> ddb->enabled_slices = 1;
> --
> 2.19.2
>
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