tree 170eff40bdf5c47cc4c35c13f1c927a952f32783
parent def76608681983c1fe70c0fa780d8fe777442ef5
author Stuart Hopkins <stuart@linux-depot.com> 1313958857 -0700
committer Florian Tobias Schandinat <FlorianSchandinat@gmx.de> 1314180644 +0000

udlfb: Add module option to do without shadow framebuffer

By default, udlfb allocates a 2nd buffer to shadow what's across
the bus on the USB device.  It can operate without this shadow,
but then it cannot tell which pixels have changed, and must send all.

Saves host memory, but worsens the USB 2.0 bus bottleneck.

This option allows users in very low memory situations (e.g.
bifferboard) to optionally turn off this shadow framebuffer.

Signed-off-by: Stuart Hopkins <stuart@linux-depot.com>
Signed-off-by: Bernie Thompson <bernie@plugable.com>
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>