drm/i915: Extract icl_set_pipe_chicken()

We need configure PIPE_CHICKEN during fastboot as well. Let's extract
it to a helper.

v2: Apparently PIPE_CHICKEN is icl+ only

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190204202139.26884-1-ville.syrjala@linux.intel.com
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 113ebd1..af848fb 100644 (file)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -3896,6 +3896,24 @@ unlock:
        clear_bit(I915_RESET_MODESET, &dev_priv->gpu_error.flags);
 }
 
+static void icl_set_pipe_chicken(struct intel_crtc *crtc)
+{
+       struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
+       enum pipe pipe = crtc->pipe;
+       u32 tmp;
+
+       tmp = I915_READ(PIPE_CHICKEN(pipe));
+
+       /*
+        * Display WA #1153: icl
+        * enable hardware to bypass the alpha math
+        * and rounding for per-pixel values 00 and 0xff
+        */
+       tmp |= PER_PIXEL_ALPHA_BYPASS_EN;
+
+       I915_WRITE(PIPE_CHICKEN(pipe), tmp);
+}
+
 static void intel_update_pipe_config(const struct intel_crtc_state *old_crtc_state,
                                     const struct intel_crtc_state *new_crtc_state)
 {
@@ -5782,7 +5800,6 @@ static void haswell_crtc_enable(struct intel_crtc_state *pipe_config,
        struct intel_atomic_state *old_intel_state =
                to_intel_atomic_state(old_state);
        bool psl_clkgate_wa;
-       u32 pipe_chicken;
 
        if (WARN_ON(intel_crtc->active))
                return;
@@ -5839,16 +5856,8 @@ static void haswell_crtc_enable(struct intel_crtc_state *pipe_config,
         */
        intel_color_load_luts(pipe_config);
 
-       /*
-        * Display WA #1153: enable hardware to bypass the alpha math
-        * and rounding for per-pixel values 00 and 0xff
-        */
-       if (INTEL_GEN(dev_priv) >= 11) {
-               pipe_chicken = I915_READ(PIPE_CHICKEN(pipe));
-               if (!(pipe_chicken & PER_PIXEL_ALPHA_BYPASS_EN))
-                       I915_WRITE_FW(PIPE_CHICKEN(pipe),
-                                     pipe_chicken | PER_PIXEL_ALPHA_BYPASS_EN);
-       }
+       if (INTEL_GEN(dev_priv) >= 11)
+               icl_set_pipe_chicken(intel_crtc);
 
        intel_ddi_set_pipe_settings(pipe_config);
        if (!transcoder_is_dsi(cpu_transcoder))