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From e577793146a1d3f3b92267c348963da6502af7e2 Mon Sep 17 00:00:00 2001
From: Jun Lei <Jun.Lei@amd.com>
Date: Wed, 16 Dec 2015 14:41:31 -0500
Subject: [PATCH 0973/1050] drm/amd/dal: Add new gamma ramp interface to dc
Change-Id: Idbde3da01e31f5b2cd2baab7b03f872113c9d374
Signed-off-by: Jun Lei <Jun.Lei@amd.com>
Acked-by: Jordan Lazare <Jordan.Lazare@amd.com>
---
drivers/gpu/drm/amd/dal/dc/dc.h | 3 ++-
drivers/gpu/drm/amd/dal/dc/dc_types.h | 32 ++++++++++++++++++++++++++++++++
2 files changed, 34 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/dal/dc/dc.h b/drivers/gpu/drm/amd/dal/dc/dc.h
index 264b428..c9cdd9c 100644
--- a/drivers/gpu/drm/amd/dal/dc/dc.h
+++ b/drivers/gpu/drm/amd/dal/dc/dc.h
@@ -75,7 +75,8 @@ struct dc_surface {
enum dc_rotation_angle rotation;
enum plane_stereo_format stereo_format;
- struct gamma_ramp gamma_correction;
+ struct gamma_ramp gamma_correction; /* deprecated */
+ struct dc_gamma_ramp gamma;
};
/*
diff --git a/drivers/gpu/drm/amd/dal/dc/dc_types.h b/drivers/gpu/drm/amd/dal/dc/dc_types.h
index b6526e9..1834fe0 100644
--- a/drivers/gpu/drm/amd/dal/dc/dc_types.h
+++ b/drivers/gpu/drm/amd/dal/dc/dc_types.h
@@ -665,6 +665,38 @@ enum dc_connection_type {
dc_connection_active_dongle
};
+/*
+ * Gamma ramp representation in DC
+ *
+ * A gamma ramp is just a curve defined within the range of [min, max] with
+ * arbitrary precision.
+ *
+ * DM is responsible for providing DC with an interface to obtain any y value
+ * within that range with a selected precision.
+ *
+ * bit32 ------------------------------------------------- bit 0
+ * [ padding ][ exponent bits ][ fraction bits ]
+ *
+ * DC specifies the input x value and precision to the callback function
+ * get_gamma_value as well as providing the context and DM returns the y
+ * value.
+ *
+ * If fraction_bits + exponent_bits exceed width of 32 bits, get_gamma_value
+ * returns 0. If x is outside the bounds of [min, max], get_gamma_value
+ * returns 0.
+ *
+ */
+struct dc_gamma_ramp {
+ uint32_t (*get_gamma_value) (
+ void *context,
+ uint8_t exponent_bits,
+ uint8_t fraction_bits,
+ uint32_t x);
+ void *context;
+ uint32_t min;
+ uint32_t max;
+};
+
struct dc_csc_adjustments {
struct fixed31_32 contrast;
struct fixed31_32 saturation;
--
1.9.1
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