drm/fb: fix FBIOGET/PUT_VSCREENINFO pixel clock handling

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When the framebuffer driver does not publish detailed timing information
for the current video mode, the correct value for the pixclock field is
zero, not -1.

Since pixclock is actually unsigned, the value -1 would be interpreted
as 4294967295 picoseconds (i.e., about 4 milliseconds) by
register_framebuffer() and userspace programs.

This patch allows X.org's fbdev driver to work.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Dave Airlie <airlied@redhat.com>

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Clemens Ladisch 2009-11-04 09:42:52 +01:00 • committed by Dave Airlie

parent 731b5a15a3

commit cda6be1ce2

1 changed files with 3 additions and 3 deletions

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6

drivers/gpu/drm/drm_fb_helper.c

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