[PATCH v2 1/4] drm: Add a new helper drm_color_ctm_s31_32_to_qm_n()

[james qian wang (Arm Technology China)]

Add a new helper function drm_color_ctm_s31_32_to_qm_n() for driver to
convert S31.32 sign-magnitude to Qm.n 2's complement that supported by
hardware.

Signed-off-by: james qian wang (Arm Technology China) <james.qian.wang@xxxxxxx>
---
 drivers/gpu/drm/drm_color_mgmt.c | 23 +++++++++++++++++++++++
 include/drm/drm_color_mgmt.h     |  2 ++
 2 files changed, 25 insertions(+)

diff --git a/drivers/gpu/drm/drm_color_mgmt.c b/drivers/gpu/drm/drm_color_mgmt.c
index 4ce5c6d8de99..3d533d0b45af 100644
--- a/drivers/gpu/drm/drm_color_mgmt.c
+++ b/drivers/gpu/drm/drm_color_mgmt.c
@@ -132,6 +132,29 @@ uint32_t drm_color_lut_extract(uint32_t user_input, uint32_t bit_precision)
 }
 EXPORT_SYMBOL(drm_color_lut_extract);

+/**
+ * drm_color_ctm_s31_32_to_qm_n
+ *
+ * @user_input: input value
+ * @m: number of integer bits
+ * @n: number of fractinal bits
+ *
+ * Convert and clamp S31.32 sign-magnitude to Qm.n 2's complement.
+ */
+uint64_t drm_color_ctm_s31_32_to_qm_n(uint64_t user_input,
+				      uint32_t m, uint32_t n)
+{
+	u64 mag = (user_input & ~BIT_ULL(63)) >> (32 - n);
+	bool negative = !!(user_input & BIT_ULL(63));
+	s64 val;
+
+	/* the range of signed 2s complement is [-2^n+m, 2^n+m - 1] */
+	val = clamp_val(mag, 0, negative ? BIT(n + m) : BIT(n + m) - 1);
+
+	return negative ? 0ll - val : val;
+}
+EXPORT_SYMBOL(drm_color_ctm_s31_32_to_qm_n);
+
 /**
  * drm_crtc_enable_color_mgmt - enable color management properties
  * @crtc: DRM CRTC
diff --git a/include/drm/drm_color_mgmt.h b/include/drm/drm_color_mgmt.h
index d1c662d92ab7..60fea5501886 100644
--- a/include/drm/drm_color_mgmt.h
+++ b/include/drm/drm_color_mgmt.h
@@ -30,6 +30,8 @@ struct drm_crtc;
 struct drm_plane;

 uint32_t drm_color_lut_extract(uint32_t user_input, uint32_t bit_precision);
+uint64_t drm_color_ctm_s31_32_to_qm_n(uint64_t user_input,
+				      uint32_t m, uint32_t n);

 void drm_crtc_enable_color_mgmt(struct drm_crtc *crtc,
 				uint degamma_lut_size,
--
2.20.1