From 7b24c9a696c1c68eaa471a27bf467e97a9986fa9 Mon Sep 17 00:00:00 2001 From: Paulo Zanoni Date: Mon, 14 Sep 2015 15:19:59 -0300 Subject: [PATCH] drm/i915: don't enable FBC when pixel rate exceeds 95% on HSW/BDW MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit BSpec says we shouldn't enable FBC on HSW/BDW when the pipe pixel rate exceeds 95% of the core display clock. v2: - HSW also needs the WA (Ville). - Add the WA name (Ville). - Use the current cdclk (Ville). Signed-off-by: Paulo Zanoni Reviewed-by: Ville Syrjälä Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/i915_drv.h | 1 + drivers/gpu/drm/i915/intel_fbc.c | 10 ++++++++++ 2 files changed, 11 insertions(+) diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index ffd4ab111957..e5242c0ce4f1 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -949,6 +949,7 @@ 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 69726a7ed0d0..1c4536ad4de9 100644 --- a/drivers/gpu/drm/i915/intel_fbc.c +++ b/drivers/gpu/drm/i915/intel_fbc.c @@ -482,6 +482,8 @@ 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"; @@ -828,6 +830,14 @@ static void __intel_fbc_update(struct drm_i915_private *dev_priv) goto out_disable; } + /* WaFbcExceedCdClockThreshold:hsw,bdw */ + if ((IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv)) && + ilk_pipe_pixel_rate(intel_crtc->config) >= + dev_priv->cdclk_freq * 95 / 100) { + set_no_fbc_reason(dev_priv, FBC_PIXEL_RATE); + goto out_disable; + } + if (intel_fbc_setup_cfb(dev_priv, obj->base.size, drm_format_plane_cpp(fb->pixel_format, 0))) { set_no_fbc_reason(dev_priv, FBC_STOLEN_TOO_SMALL); -- 2.20.1