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drm: Remove plane hsub/vsub alignment requirement for core helpers

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The drm_format_info_plane_{height,width} functions was implemented using
regular division for the plane size calculation, which cause issues [1][2]
when used on contexts where the dimensions are misaligned with relation
to the subsampling factors. So, replace the regular division by the
DIV_ROUND_UP macro.

This allows these functions to be used in more drivers, making further
work to bring more core presence on them possible.

[1] http://patchwork.freedesktop.org/patch/msgid/20170321181218.10042-3-ville.syrjala@linux.intel.com
[2] https://patchwork.freedesktop.org/patch/msgid/20211026225105.2783797-2-imre.deak@intel.com

Signed-off-by: Carlos Eduardo Gallo Filho <gcarlos@disroot.org>
Reviewed-by: André Almeida <andrealmeid@igalia.com>
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20230926141519.9315-2-gcarlos@disroot.org
This commit is contained in:
Carlos Eduardo Gallo Filho 2023-09-26 11:15:18 -03:00 committed by Thomas Zimmermann
parent 052ddf7b86
commit f2f455981a
1 changed files with 3 additions and 2 deletions
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5
include/drm/drm_fourcc.h
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@ -22,6 +22,7 @@
#ifndef __DRM_FOURCC_H__
#define __DRM_FOURCC_H__
#include <linux/math.h>
#include <linux/types.h>
#include <uapi/drm/drm_fourcc.h>
@ -279,7 +280,7 @@ int drm_format_info_plane_width(const struct drm_format_info *info, int width,
if (plane == 0)
return width;
return width / info->hsub;
return DIV_ROUND_UP(width, info->hsub);
}
/**
@ -301,7 +302,7 @@ int drm_format_info_plane_height(const struct drm_format_info *info, int height,
if (plane == 0)
return height;
return height / info->vsub;
return DIV_ROUND_UP(height, info->vsub);
}
const struct drm_format_info *__drm_format_info(u32 format);