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Tue, 15 Oct 2019 02:10:46 +0000 From: "james qian wang (Arm Technology China)" To: Liviu Dudau , "airlied@linux.ie" , Brian Starkey , "maarten.lankhorst@linux.intel.com" , "sean@poorly.run" , "imirkin@alum.mit.edu" CC: "Jonathan Chai (Arm Technology China)" , "Julien Yin (Arm Technology China)" , "Thomas Sun (Arm Technology China)" , "Lowry Li (Arm Technology China)" , Ayan Halder , "Tiannan Zhu (Arm Technology China)" , "Yiqi Kang (Arm Technology China)" , nd , "linux-kernel@vger.kernel.org" , "dri-devel@lists.freedesktop.org" , Ben Davis , "Oscar Zhang (Arm Technology China)" , "Channing Chen (Arm Technology China)" , Mihail Atanassov , "james qian wang (Arm Technology China)" , Daniel Vetter Subject: [PATCH v4 1/4] drm: Add a new helper drm_color_ctm_s31_32_to_qm_n() Thread-Topic: [PATCH v4 1/4] drm: Add a new helper drm_color_ctm_s31_32_to_qm_n() Thread-Index: AQHVgv3BWlwKETCEA0mEVRVx1dwUKA== Date: Tue, 15 Oct 2019 02:10:45 +0000 Message-ID: <20191015021016.327-2-james.qian.wang@arm.com> References: <20191015021016.327-1-james.qian.wang@arm.com> In-Reply-To: <20191015021016.327-1-james.qian.wang@arm.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [113.29.88.7] x-clientproxiedby: HK0PR01CA0030.apcprd01.prod.exchangelabs.com (2603:1096:203:3e::18) To VE1PR08MB5006.eurprd08.prod.outlook.com (2603:10a6:803:113::31) Authentication-Results-Original: spf=none (sender IP is ) smtp.mailfrom=james.qian.wang@arm.com; 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V4: Address Mihai, Daniel and Ilia's review comments. Signed-off-by: james qian wang (Arm Technology China) Reviewed-by: Mihail Atanassov Reviewed-by: Daniel Vetter --- drivers/gpu/drm/drm_color_mgmt.c | 26 ++++++++++++++++++++++++++ include/drm/drm_color_mgmt.h | 2 ++ 2 files changed, 28 insertions(+) diff --git a/drivers/gpu/drm/drm_color_mgmt.c b/drivers/gpu/drm/drm_color_m= gmt.c index 4ce5c6d8de99..a6d78b247713 100644 --- a/drivers/gpu/drm/drm_color_mgmt.c +++ b/drivers/gpu/drm/drm_color_mgmt.c @@ -132,6 +132,32 @@ uint32_t drm_color_lut_extract(uint32_t user_input, ui= nt32_t bit_precision) } EXPORT_SYMBOL(drm_color_lut_extract); =20 +/** + * drm_color_ctm_s31_32_to_qm_n + * + * @user_input: input value + * @m: number of integer bits, doesn't include sign-bit, only support m <= =3D 31 + * @n: number of fractional bits, only support n <=3D 32 + * + * Convert and clamp S31.32 sign-magnitude to Qm.n (signed 2's complement)= . The + * higher bits that above m + n + 1 are equal or cleared to sign-bit BIT(m= +n+1). + */ +uint64_t drm_color_ctm_s31_32_to_qm_n(uint64_t user_input, + uint32_t m, uint32_t n) +{ + u64 mag =3D (user_input & ~BIT_ULL(63)) >> (32 - n); + bool negative =3D !!(user_input & BIT_ULL(63)); + s64 val; + + WARN_ON(m > 31 || n > 32); + + /* the range of signed 2's complement is [-2^n+m, 2^n+m - 1] */ + val =3D clamp_val(mag, 0, negative ? BIT_ULL(n + m) : BIT_ULL(n + m) - 1)= ; + + return negative ? -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; =20 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); =20 void drm_crtc_enable_color_mgmt(struct drm_crtc *crtc, uint degamma_lut_size, --=20 2.20.1