android/android_hardware_qcom_display
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

libgralloc: fb size alignment to pagesize

Browse Source 
Align framebuffer size and offset to pagesize, calculate
framebuffer size based on this alignment and use it for
mapping framebuffer in userspace and page flipping.

CRs-fixed: 332175

(cherry picked from commit d89b0493b4651fbaaeccccf0ae880cbf1a3a3479)

Change-Id: I7840f7f3c5c42852087cb9df6ae85680c971c601
This commit is contained in:
Prabhanjan Kandula 2012-01-23 16:13:38 +05:30 committed by Andrew Sutherland
parent 58676afccd
commit e80c89a867
2 changed files with 15 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
libgralloc/framebuffer.cpp
View File

@ -636,10 +636,14 @@ int mapFrameBufferLocked(struct private_module_t* module)
info.transp.length = 0;
module->fbFormat = HAL_PIXEL_FORMAT_RGB_565;
}
//adreno needs 4k aligned offsets. Max hole size is 4096-1
int size = roundUpToPageSize(info.yres * info.xres * (info.bits_per_pixel/8));
/*
* Request NUM_BUFFERS screens (at lest 2 for page flipping)
*/
int numberOfBuffers = (int)(finfo.smem_len/(info.yres * info.xres * (info.bits_per_pixel/8)));
int numberOfBuffers = (int)(finfo.smem_len/size);
LOGV("num supported framebuffers in kernel = %d", numberOfBuffers);
if (property_get("debug.gr.numframebuffers", property, NULL) > 0) {
@ -769,13 +773,13 @@ int mapFrameBufferLocked(struct private_module_t* module)
*/
int err;
size_t fbSize = roundUpToPageSize(finfo.line_length * info.yres_virtual);
module->framebuffer = new private_handle_t(fd, fbSize,
private_handle_t::PRIV_FLAGS_USES_PMEM, BUFFER_TYPE_UI, module->fbFormat, info.xres, info.yres);
module->numBuffers = info.yres_virtual / info.yres;
module->bufferMask = 0;
//adreno needs page aligned offsets. Align the fbsize to pagesize.
size_t fbSize = roundUpToPageSize(finfo.line_length * info.yres) * module->numBuffers;
module->framebuffer = new private_handle_t(fd, fbSize,
private_handle_t::PRIV_FLAGS_USES_PMEM, BUFFER_TYPE_UI,
module->fbFormat, info.xres, info.yres);
void* vaddr = mmap(0, fbSize, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
if (vaddr == MAP_FAILED) {
LOGE("Error mapping the framebuffer (%s)", strerror(errno));

6
libgralloc/gpu.cpp
View File

@ -90,7 +90,11 @@ int gpu_context_t::gralloc_alloc_framebuffer_locked(size_t size, int usage,
const uint32_t bufferMask = m->bufferMask;
const uint32_t numBuffers = m->numBuffers;
const size_t bufferSize = m->finfo.line_length * m->info.yres;
size_t bufferSize = m->finfo.line_length * m->info.yres;
//adreno needs FB size to be page aligned
bufferSize = roundUpToPageSize(bufferSize);
if (numBuffers == 1) {
// If we have only one buffer, we never use page-flipping. Instead,
// we return a regular buffer which will be memcpy'ed to the main