kernel/linux.git/include/drm/drm_fixed.h, branch v6.6.132

drm: Fix drm_fixp2int_round() making it add 0.5

2024-03-26T22:20:10+00:00

[ Upstream commit 807f96abdf14c80f534c78f2d854c2590963345c ] As well noted by Pekka[1], the rounding of drm_fixp2int_round is wrong. To round a number, you need to add 0.5 to the number and floor that, drm_fixp2int_round() is adding 0.0000076. Make it add 0.5. [1]: https://lore.kernel.org/all/20240301135327.22efe0dd.pekka.paalanen@collabora.com/ Fixes: 8b25320887d7 ("drm: Add fixed-point helper to get rounded integer values") Suggested-by: Pekka Paalanen Reviewed-by: Harry Wentland Reviewed-by: Melissa Wen Signed-off-by: Arthur Grillo Signed-off-by: Melissa Wen Link: https://patchwork.freedesktop.org/patch/msgid/20240316-drm_fixed-v2-1-c1bc2665b5ed@riseup.net Signed-off-by: Sasha Levin

drm: Don't treat 0 as -1 in drm_fixp2int_ceil

2024-03-26T22:19:42+00:00

[ Upstream commit cf8837d7204481026335461629b84ac7f4538fa5 ] Unit testing this in VKMS shows that passing 0 into this function returns -1, which is highly counter- intuitive. Fix it by checking whether the input is >= 0 instead of > 0. Fixes: 64566b5e767f ("drm: Add drm_fixp_from_fraction and drm_fixp2int_ceil") Signed-off-by: Harry Wentland Reviewed-by: Simon Ser Reviewed-by: Melissa Wen Signed-off-by: Melissa Wen Link: https://patchwork.freedesktop.org/patch/msgid/20231108163647.106853-2-harry.wentland@amd.com Signed-off-by: Sasha Levin

drm: Add fixed-point helper to get rounded integer values

2023-05-15T13:58:10+00:00

Create a new fixed-point helper to allow us to return the rounded value of our fixed point value. [v2]: * Create the function drm_fixp2int_round() (Melissa Wen). [v3]: * Use drm_fixp2int() instead of shifting manually (Arthur Grillo). Signed-off-by: Maíra Canal Reviewed-by: Arthur Grillo Signed-off-by: Maíra Canal Link: https://patchwork.freedesktop.org/patch/msgid/20230512104044.65034-1-mcanal@igalia.com

drm: Remove unnecessary include statements for drm_crtc_helper.h

2023-01-18T08:25:30+00:00

Several DRM core and helper source files include drm_crtc_helper.h without needing it or only to get its transitive include statements; leading to unnecessary compile-time dependencies. Directly include required headers and drop drm_crtc_helper.h where possible. The header file, drm_fixed.h, includes for lower_32_bits(). v2: * include drm_crtc_helper.h in drm_crtc_helper.c (Sam) Signed-off-by: Thomas Zimmermann Reviewed-by: Sam Ravnborg Acked-by: Jani Nikula Acked-by: Alex Deucher Link: https://patchwork.freedesktop.org/patch/msgid/20230116131235.18917-3-tzimmermann@suse.de

drm: Add drm_fixp_from_fraction and drm_fixp2int_ceil

2016-02-05T05:23:48+00:00

drm_fixp_from_fraction allows us to create a fixed point directly from a fraction, rather than creating fixed point values and dividing later. This avoids overflow of our 64 bit value for large numbers. drm_fixp2int_ceil allows us to return the ceiling of our fixed point value. [airlied: squash Jordan's fix] 32-bit-build-fix: Jordan Lazare Signed-off-by: Harry Wentland Cc: stable@vger.kernel.org Reviewed-by: Alex Deucher Signed-off-by: Dave Airlie

drm: fix 64 bit drm fixed point helpers

2013-07-30T21:24:13+00:00

Sign bit wasn't handled properly and a small typo. Thanks to Christian for helping me sort this out. Signed-off-by: Alex Deucher

drm: add some additional fixed point helpers (v3)

2013-06-27T23:16:37+00:00

Required for certain driver calculations. Code was written by Christian König and ported to the drm by me. v2: fix 64 bit divides v3: fix 64 bit for real (math64.h) Signed-off-by: Alex Deucher

drm: fixed: Add dfixed_frac

2012-04-27T08:29:35+00:00

This helper macro retrieves the fractional part of a fixed20_12 20.12 fixed-point number. Signed-off-by: Robert Morell Signed-off-by: Olof Johansson Signed-off-by: Thierry Reding Signed-off-by: Dave Airlie

drm: move radeon_fixed.h to shared drm_fixed.h header

2010-05-18T08:21:33+00:00

Will be used by nouveau driver also in the near future. Signed-off-by: Ben Skeggs Signed-off-by: Dave Airlie