drm/i915: handle FBC and self-refresh better
On 945, we need to avoid entering self-refresh if the compressor is busy, or we may cause display FIFO underruns leading to ugly flicker. Fixes fdo bug #24314, kernel bug #15043. Tested-by: Alexander Lam <lambchop468@gmail.com> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org> Tested-by: Julien Cristau <jcristau@debian.org> (fd.o #25371) Cc: stable@kernel.org Signed-off-by: Eric Anholt <eric@anholt.net>
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@ -338,6 +338,7 @@
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#define FBC_CTL_PERIODIC (1<<30)
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#define FBC_CTL_INTERVAL_SHIFT (16)
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#define FBC_CTL_UNCOMPRESSIBLE (1<<14)
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#define FBC_C3_IDLE (1<<13)
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#define FBC_CTL_STRIDE_SHIFT (5)
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#define FBC_CTL_FENCENO (1<<0)
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#define FBC_COMMAND 0x0320c
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@ -1031,6 +1031,8 @@ static void i8xx_enable_fbc(struct drm_crtc *crtc, unsigned long interval)
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/* enable it... */
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fbc_ctl = FBC_CTL_EN | FBC_CTL_PERIODIC;
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if (IS_I945GM(dev))
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fbc_ctl |= FBC_C3_IDLE; /* 945 needs special SR handling */
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fbc_ctl |= (dev_priv->cfb_pitch & 0xff) << FBC_CTL_STRIDE_SHIFT;
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fbc_ctl |= (interval & 0x2fff) << FBC_CTL_INTERVAL_SHIFT;
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if (obj_priv->tiling_mode != I915_TILING_NONE)
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