linux-kernel - [PATCH 1/5] drm: Add drm_fixed_16

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Message-Id: <20210901175431.14060-1-alyssa@rosenzweig.io>
Date:   Wed,  1 Sep 2021 13:54:27 -0400
From:   Alyssa Rosenzweig <alyssa@...enzweig.io>
To:     dri-devel@...ts.freedesktop.org
Cc:     Neil Armstrong <narmstrong@...libre.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Kevin Hilman <khilman@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
        Sandy Huang <hjc@...k-chips.com>,
        Heiko Stübner <heiko@...ech.de>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Abhinav Kumar <abhinavk@...eaurora.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Lee Jones <lee.jones@...aro.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Kalyan Thota <kalyan_t@...eaurora.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Ville Syrjälä 
        <ville.syrjala@...ux.intel.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Alyssa Rosenzweig <alyssa@...enzweig.io>
Subject: [PATCH 1/5] drm: Add drm_fixed_16_16 helper

This constructs a fixed 16.16 rational, useful to specify the minimum
and maximum scaling in drm_atomic_helper_check_plane_state. It is
open-coded as a macro in multiple drivers, so let's share the helper.

Signed-off-by: Alyssa Rosenzweig <alyssa@...enzweig.io>
---
 include/drm/drm_fixed.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/drm/drm_fixed.h b/include/drm/drm_fixed.h
index 553210c02ee0..df1f369b4918 100644
--- a/include/drm/drm_fixed.h
+++ b/include/drm/drm_fixed.h
@@ -208,4 +208,9 @@ static inline s64 drm_fixp_exp(s64 x)
 	return sum;
 }
 
+static inline int drm_fixed_16_16(s32 mult, s32 div)
+{
+	return (mult << 16) / div;
+}
+
 #endif
-- 
2.30.2