Use of the new DRM_COLOR_LUT_NON_DECREASING test was a bit over-zealous;
it doesn't actually need to be applied to the degamma on "bdw-style"
platforms. Likewise, we overlooked the fact that CHV should have that
test applied to the gamma LUT as well as the degamma LUT.
Rather than adding more complicated platform checking to
intel_color_check(), let's just store the appropriate set of LUT
validation flags for each platform in the intel_device_info structure.
Fixes: 85e2d61e4976 ("drm/i915: Validate userspace-provided color management LUT's (v4)")
References: https://lists.freedesktop.org/archives/intel-gfx/2019-January/187634.html
Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Signed-off-by: Matt Roper <matthew.d.roper@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_pci.c | 10 ++++++++--
drivers/gpu/drm/i915/intel_color.c | 19 +++++--------------
drivers/gpu/drm/i915/intel_device_info.h | 2 ++
3 files changed, 15 insertions(+), 16 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_pci.c b/drivers/gpu/drm/i915/i915_pci.c
index 44c23ac60347..17f5a605b0b3 100644
--- a/drivers/gpu/drm/i915/i915_pci.c
+++ b/drivers/gpu/drm/i915/i915_pci.c
@@ -69,9 +69,15 @@
#define BDW_COLORS \
.color = { .degamma_lut_size = 512, .gamma_lut_size = 512 }
#define CHV_COLORS \
- .color = { .degamma_lut_size = 65, .gamma_lut_size = 257 }
+ .color = { .degamma_lut_size = 65, .gamma_lut_size = 257, \
+ .degamma_lut_tests = DRM_COLOR_LUT_NON_DECREASING, \
+ .gamma_lut_tests = DRM_COLOR_LUT_NON_DECREASING, \
+ }
#define GLK_COLORS \
- .color = { .degamma_lut_size = 0, .gamma_lut_size = 1024 }
+ .color = { .degamma_lut_size = 0, .gamma_lut_size = 1024, \
+ .degamma_lut_tests = DRM_COLOR_LUT_NON_DECREASING | \
+ DRM_COLOR_LUT_EQUAL_CHANNELS, \
+ }
/* Keep in gen based order, and chronological order within a gen */
diff --git a/drivers/gpu/drm/i915/intel_color.c b/drivers/gpu/drm/i915/intel_color.c
index bc7589656a8f..cd08f58b1e47 100644
--- a/drivers/gpu/drm/i915/intel_color.c
+++ b/drivers/gpu/drm/i915/intel_color.c
@@ -609,24 +609,15 @@ int intel_color_check(struct intel_crtc_state *crtc_state)
{
struct drm_i915_private *dev_priv = to_i915(crtc_state->base.crtc->dev);
size_t gamma_length, degamma_length;
- uint32_t tests = DRM_COLOR_LUT_NON_DECREASING;
+ u32 gamma_tests, degamma_tests;
degamma_length = INTEL_INFO(dev_priv)->color.degamma_lut_size;
gamma_length = INTEL_INFO(dev_priv)->color.gamma_lut_size;
+ degamma_tests = INTEL_INFO(dev_priv)->color.degamma_lut_tests;
+ gamma_tests = INTEL_INFO(dev_priv)->color.gamma_lut_tests;
- /*
- * All of our platforms mandate that the degamma curve be
- * non-decreasing. Additionally, GLK and gen11 only accept a single
- * value for red, green, and blue in the degamma table. Make sure
- * userspace didn't try to pass us something we can't handle.
- *
- * We don't have any extra hardware constraints on the gamma table,
- * so no need to explicitly check it.
- */
- if (IS_GEMINILAKE(dev_priv) || INTEL_GEN(dev_priv) >= 10)
- tests |= DRM_COLOR_LUT_EQUAL_CHANNELS;
-
- if (drm_color_lut_check(crtc_state->base.degamma_lut, tests) != 0)
+ if (drm_color_lut_check(crtc_state->base.degamma_lut, degamma_tests) ||
+ drm_color_lut_check(crtc_state->base.gamma_lut, gamma_tests))
return -EINVAL;
/*
diff --git a/drivers/gpu/drm/i915/intel_device_info.h b/drivers/gpu/drm/i915/intel_device_info.h
index 957c6527f76b..7bf09cef591a 100644
--- a/drivers/gpu/drm/i915/intel_device_info.h
+++ b/drivers/gpu/drm/i915/intel_device_info.h
@@ -189,6 +189,8 @@ struct intel_device_info {
struct color_luts {
u16 degamma_lut_size;
u16 gamma_lut_size;
+ u32 degamma_lut_tests;
+ u32 gamma_lut_tests;
} color;
};
--
2.14.5
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