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drm/i915: Fix PSF GV point mask when SAGV is not possible

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Don't just mask off all the PSF GV points when SAGV gets disabled.
This should in fact cause the Pcode to reject the request since
at least one PSF point must remain enabled at all times.

Cc: stable@vger.kernel.org
Cc: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
Fixes: 192fbfb767 ("drm/i915: Implement PSF GV point support")
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220309164948.10671-7-ville.syrjala@linux.intel.com
Reviewed-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
(cherry picked from commit 0fed4ddd18)
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
This commit is contained in:
Ville Syrjälä 2022-03-09 18:49:46 +02:00 committed by Tvrtko Ursulin
parent 1937f3feb0
commit 3ef8b5e19e
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/i915/display/intel_bw.c
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@ -992,7 +992,8 @@ int intel_bw_atomic_check(struct intel_atomic_state *state)
* cause.
*/
if (!intel_can_enable_sagv(dev_priv, new_bw_state)) {
allowed_points = BIT(max_bw_point);
allowed_points &= ADLS_PSF_PT_MASK;
allowed_points |= BIT(max_bw_point);
drm_dbg_kms(&dev_priv->drm, "No SAGV, using single QGV point %d\n",
max_bw_point);
}