BSpec says we shouldn't enable FBC on BDW when the pipe pixel rate
exceeds 95% of the core display clock.
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_drv.h | 1 +
drivers/gpu/drm/i915/intel_fbc.c | 8 ++++++++
2 files changed, 9 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index f44d101..f8f3ed3 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -946,6 +946,7 @@ struct i915_fbc {
FBC_ROTATION, /* rotation is not supported */
FBC_IN_DBG_MASTER, /* kernel debugger is active */
FBC_BAD_STRIDE, /* stride is not supported */
+ FBC_PIXEL_RATE, /* pixel rate is too big */
} no_fbc_reason;
bool (*fbc_enabled)(struct drm_i915_private *dev_priv);
diff --git a/drivers/gpu/drm/i915/intel_fbc.c b/drivers/gpu/drm/i915/intel_fbc.c
index cfd4cba..9dee0b5 100644
--- a/drivers/gpu/drm/i915/intel_fbc.c
+++ b/drivers/gpu/drm/i915/intel_fbc.c
@@ -503,6 +503,8 @@ const char *intel_no_fbc_reason_str(enum no_fbc_reason reason)
return "Kernel debugger is active";
case FBC_BAD_STRIDE:
return "framebuffer stride not supported";
+ case FBC_PIXEL_RATE:
+ return "pixel rate is too big";
default:
MISSING_CASE(reason);
return "unknown reason";
@@ -850,6 +852,12 @@ static void __intel_fbc_update(struct drm_i915_private *dev_priv)
goto out_disable;
}
+ if (IS_BROADWELL(dev_priv) && ilk_pipe_pixel_rate(intel_crtc->config) >=
+ dev_priv->max_cdclk_freq * 95 / 100) {
+ set_no_fbc_reason(dev_priv, FBC_PIXEL_RATE);
+ goto out_disable;
+ }
+
if (intel_fbc_setup_cfb(intel_crtc)) {
set_no_fbc_reason(dev_priv, FBC_STOLEN_TOO_SMALL);
goto out_disable;
--
2.4.6
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