GC MAX register is used to program values from 1.0 to
less than 3.0. A different register was used instead of
the intended one. Fixed the same.
Currently limiting it to 1.0 due to ABI limitations.
v2: Updated the 1.0 programming and aligned as per GLK, based
on Ville's feedback.
Reported-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Signed-off-by: Uma Shankar <uma.shankar@xxxxxxxxx>
---
drivers/gpu/drm/i915/intel_color.c | 22 +++++++++++-----------
1 file changed, 11 insertions(+), 11 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_color.c b/drivers/gpu/drm/i915/intel_color.c
index ff910ed..c776159 100644
--- a/drivers/gpu/drm/i915/intel_color.c
+++ b/drivers/gpu/drm/i915/intel_color.c
@@ -518,14 +518,14 @@ static void bdw_load_gamma_lut(const struct intel_crtc_state *crtc_state, u32 of
I915_WRITE(PREC_PAL_DATA(pipe), word);
}
- /* Program the max register to clamp values > 1.0. */
- i = lut_size - 1;
- I915_WRITE(PREC_PAL_GC_MAX(pipe, 0),
- drm_color_lut_extract(lut[i].red, 16));
- I915_WRITE(PREC_PAL_GC_MAX(pipe, 1),
- drm_color_lut_extract(lut[i].green, 16));
- I915_WRITE(PREC_PAL_GC_MAX(pipe, 2),
- drm_color_lut_extract(lut[i].blue, 16));
+ /*
+ * Program the max register to clamp values > 1.0.
+ * ToDo: Extend the ABI to be able to program values
+ * from 1.0 to 3.0
+ */
+ I915_WRITE(PREC_PAL_EXT_GC_MAX(pipe, 0), (1 << 16));
+ I915_WRITE(PREC_PAL_EXT_GC_MAX(pipe, 1), (1 << 16));
+ I915_WRITE(PREC_PAL_EXT_GC_MAX(pipe, 2), (1 << 16));
} else {
for (i = 0; i < lut_size; i++) {
u32 v = (i * ((1 << 10) - 1)) / (lut_size - 1);
@@ -534,9 +534,9 @@ static void bdw_load_gamma_lut(const struct intel_crtc_state *crtc_state, u32 of
(v << 20) | (v << 10) | v);
}
- I915_WRITE(PREC_PAL_GC_MAX(pipe, 0), (1 << 16) - 1);
- I915_WRITE(PREC_PAL_GC_MAX(pipe, 1), (1 << 16) - 1);
- I915_WRITE(PREC_PAL_GC_MAX(pipe, 2), (1 << 16) - 1);
+ I915_WRITE(PREC_PAL_EXT_GC_MAX(pipe, 0), (1 << 16));
+ I915_WRITE(PREC_PAL_EXT_GC_MAX(pipe, 1), (1 << 16));
+ I915_WRITE(PREC_PAL_EXT_GC_MAX(pipe, 2), (1 << 16));
}
/*
--
1.9.1
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