drm/i915: Recalculate FBC w/a stride when needed

Currently we're failing to recalculate the gen9 FBC w/a stride
unless something more drastic than just the modifier itself has
changed. This often leaves us with FBC enabled with the linear
fbdev framebuffer without the w/a stride enabled. That will cause
an immediate underrun and FBC will get promptly disabled.

Fix the problem by checking if the w/a stride is about to change,
and go through the full dance if so. This part of the FBC code
is still pretty much a disaster and will need lots more work.
But this should at least fix the immediate issue.

v2: Deactivate FBC when the modifier changes since that will
    likely require resetting the w/a CFB stride

Cc: stable@vger.kernel.org
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200711080336.13423-1-ville.syrjala@linux.intel.com
Reviewed-by: José Roberto de Souza <jose.souza@intel.com>
(cherry picked from commit 0428ab013fdd39dbfb8f4cd8ad2b60af3776c6b9)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>

diff --git a/drivers/gpu/drm/i915/display/intel_fbc.c b/drivers/gpu/drm/i915/display/intel_fbc.c
index a65d9d8..412572f 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_fbc.c
+++ b/drivers/gpu/drm/i915/display/intel_fbc.c
@@ -719,6 +719,25 @@ static bool intel_fbc_cfb_size_changed(struct drm_i915_private *dev_priv)
                fbc->compressed_fb.size * fbc->threshold;
 }
 
+static u16 intel_fbc_gen9_wa_cfb_stride(struct drm_i915_private *dev_priv)
+{
+       struct intel_fbc *fbc = &dev_priv->fbc;
+       struct intel_fbc_state_cache *cache = &fbc->state_cache;
+
+       if ((IS_GEN9_BC(dev_priv) || IS_BROXTON(dev_priv)) &&
+           cache->fb.modifier != I915_FORMAT_MOD_X_TILED)
+               return DIV_ROUND_UP(cache->plane.src_w, 32 * fbc->threshold) * 8;
+       else
+               return 0;
+}
+
+static bool intel_fbc_gen9_wa_cfb_stride_changed(struct drm_i915_private *dev_priv)
+{
+       struct intel_fbc *fbc = &dev_priv->fbc;
+
+       return fbc->params.gen9_wa_cfb_stride != intel_fbc_gen9_wa_cfb_stride(dev_priv);
+}
+
 static bool intel_fbc_can_enable(struct drm_i915_private *dev_priv)
 {
        struct intel_fbc *fbc = &dev_priv->fbc;
@@ -877,6 +896,7 @@ static void intel_fbc_get_reg_params(struct intel_crtc *crtc,
        params->crtc.i9xx_plane = to_intel_plane(crtc->base.primary)->i9xx_plane;
 
        params->fb.format = cache->fb.format;
+       params->fb.modifier = cache->fb.modifier;
        params->fb.stride = cache->fb.stride;
 
        params->cfb_size = intel_fbc_calculate_cfb_size(dev_priv, cache);
@@ -906,6 +926,9 @@ static bool intel_fbc_can_flip_nuke(const struct intel_crtc_state *crtc_state)
        if (params->fb.format != cache->fb.format)
                return false;
 
+       if (params->fb.modifier != cache->fb.modifier)
+               return false;
+
        if (params->fb.stride != cache->fb.stride)
                return false;
 
@@ -1185,7 +1208,8 @@ void intel_fbc_enable(struct intel_atomic_state *state,
 
        if (fbc->crtc) {
                if (fbc->crtc != crtc ||
-                   !intel_fbc_cfb_size_changed(dev_priv))
+                   (!intel_fbc_cfb_size_changed(dev_priv) &&
+                    !intel_fbc_gen9_wa_cfb_stride_changed(dev_priv)))
                        goto out;
 
                __intel_fbc_disable(dev_priv);
@@ -1207,12 +1231,7 @@ void intel_fbc_enable(struct intel_atomic_state *state,
                goto out;
        }
 
-       if ((IS_GEN9_BC(dev_priv) || IS_BROXTON(dev_priv)) &&
-           plane_state->hw.fb->modifier != I915_FORMAT_MOD_X_TILED)
-               cache->gen9_wa_cfb_stride =
-                       DIV_ROUND_UP(cache->plane.src_w, 32 * fbc->threshold) * 8;
-       else
-               cache->gen9_wa_cfb_stride = 0;
+       cache->gen9_wa_cfb_stride = intel_fbc_gen9_wa_cfb_stride(dev_priv);
 
        drm_dbg_kms(&dev_priv->drm, "Enabling FBC on pipe %c\n",
                    pipe_name(crtc->pipe));

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index f79f118..ae99a91 100644 (file)
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -440,6 +440,7 @@ struct intel_fbc {
                struct {
                        const struct drm_format_info *format;
                        unsigned int stride;
+                       u64 modifier;
                } fb;
 
                int cfb_size;