drm/i915/tv: Preserve reserved DAC bits during mode-setting
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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@ -1481,6 +1481,7 @@
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# define TV_TEST_MODE_MASK (7 << 0)
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#define TV_DAC 0x68004
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# define TV_DAC_SAVE 0x00ffff00
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/**
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* Reports that DAC state change logic has reported change (RO).
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*
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@ -1196,7 +1196,7 @@ intel_tv_mode_set(struct drm_encoder *encoder, struct drm_display_mode *mode,
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I915_WRITE(TV_V_LUMA_0 + (i<<2), tv_mode->filter_table[j++]);
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for (i = 0; i < 43; i++)
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I915_WRITE(TV_V_CHROMA_0 + (i<<2), tv_mode->filter_table[j++]);
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I915_WRITE(TV_DAC, 0);
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I915_WRITE(TV_DAC, I915_READ(TV_DAC) & TV_DAC_SAVE);
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I915_WRITE(TV_CTL, tv_ctl);
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}
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