drm/i915/fbc: Enable fbc on i865

Unlike all the other pre-snb desktop platforms i865 actually
supports FBC. Let's enable it.

Quote from the spec:
"DevSDG provides the same Run-Length Encoded Frame Buffer
 Compression (RLEFBC) function as exists in DevMGM."

As i865 only has the one pipe we want to skip massaging the
plane<->pipe assignment aimed at getting FBC+LVDS working on
the mobile platforms.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200702153723.24327-4-ville.syrjala@linux.intel.com
Reviewed-by: José Roberto de Souza <jose.souza@intel.com>

diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index 98a59e0..dff7c17 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -16332,7 +16332,8 @@ intel_primary_plane_create(struct drm_i915_private *dev_priv, enum pipe pipe)
         * On gen2/3 only plane A can do FBC, but the panel fitter and LVDS
         * port is hooked to pipe B. Hence we want plane A feeding pipe B.
         */
-       if (HAS_FBC(dev_priv) && INTEL_GEN(dev_priv) < 4)
+       if (HAS_FBC(dev_priv) && INTEL_GEN(dev_priv) < 4 &&
+           INTEL_NUM_PIPES(dev_priv) == 2)
                plane->i9xx_plane = (enum i9xx_plane_id) !pipe;
        else
                plane->i9xx_plane = (enum i9xx_plane_id) pipe;

diff --git a/drivers/gpu/drm/i915/i915_pci.c b/drivers/gpu/drm/i915/i915_pci.c
index e5fdf17..0be3b66 100644 (file)
--- a/drivers/gpu/drm/i915/i915_pci.c
+++ b/drivers/gpu/drm/i915/i915_pci.c
@@ -217,6 +217,7 @@ static const struct intel_device_info i85x_info = {
 static const struct intel_device_info i865g_info = {
        I845_FEATURES,
        PLATFORM(INTEL_I865G),
+       .display.has_fbc = 1,
 };
 
 #define GEN3_FEATURES \