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drm_fourcc: Document linear modifier
Not setting the fb modifiers flag is something different from setting the fb modifiers to 0 (which means explicitly linear). We kinda failed to document that properly. Spotted by Kristian. Cc: hoegsberg@google.com Reviewed-by: Kristian H. Kristensen <hoegsberg@google.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/1478694996-4200-1-git-send-email-daniel.vetter@ffwll.ch
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@ -172,6 +172,16 @@ extern "C" {
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* authoritative source for all of these.
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*/
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/*
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* Linear Layout
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*
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* Just plain linear layout. Note that this is different from no specifying any
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* modifier (e.g. not setting DRM_MODE_FB_MODIFIERS in the DRM_ADDFB2 ioctl),
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* which tells the driver to also take driver-internal information into account
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* and so might actually result in a tiled framebuffer.
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*/
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#define DRM_FORMAT_MOD_LINEAR fourcc_mod_code(NONE, 0)
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/* Intel framebuffer modifiers */
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/*
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