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gralloc: let target configure page flipping ioctl

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Let vendor choose which framebuffer ioctl (FBIOPUT_VSCREENINFO or
FBIOPAN_DISPLAY) is best suited to do page-flip on its target platform.
Neither API is well documented about their usage and most of the
time it really depends on the respective framebuffer driver implementation.

* Default ioctl to do page-flip is FBIOPUT_VSCREENINFO.
* Set "TARGET_USE_PAN_DISPLAY=true" in board config file to use FBIOPAN_DISPLAY.

Change-Id: Ic3a50bd0f5fe37ac0149e11649c4abdadea85529
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
This commit is contained in:
Bernhard Rosenkraenzer
2014-02-25 13:50:34 +05:30
committed by Amit Pundir
parent 5e3ac6bc71
commit 5641642a20
2 changed files with 16 additions and 1 deletions
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14
modules/gralloc/framebuffer.cpp
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@@ -42,6 +42,13 @@
/*****************************************************************************/
// Set TARGET_USE_PAN_DISPLAY to true at compile time if the
// board uses FBIOPAN_DISPLAY to setup page flipping, otherwise
// default ioctl to do page-flipping is FBIOPUT_VSCREENINFO.
#ifndef USE_PAN_DISPLAY
#define USE_PAN_DISPLAY 0
#endif
// numbers of buffers for page flipping
#define NUM_BUFFERS 2
@@ -178,10 +185,15 @@ int mapFrameBufferLocked(struct private_module_t* module)
uint32_t flags = PAGE_FLIP;
#if USE_PAN_DISPLAY
if (ioctl(fd, FBIOPAN_DISPLAY, &info) == -1) {
ALOGW("FBIOPAN_DISPLAY failed, page flipping not supported");
#else
if (ioctl(fd, FBIOPUT_VSCREENINFO, &info) == -1) {
ALOGW("FBIOPUT_VSCREENINFO failed, page flipping not supported");
#endif
info.yres_virtual = info.yres;
flags &= ~PAGE_FLIP;
ALOGW("FBIOPUT_VSCREENINFO failed, page flipping not supported");
}
if (info.yres_virtual < info.yres * 2) {