LineageOS/android_vendor_qcom_opensource_display-commonsys-intf
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hwc/fb/overlay: wait for fbpost and pan display

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Draw sequence in hwc_set
--eglSwapBuffers
--wait for fb_post. Its ok to draw to External only at this point.
--draw to external   | Parallel with PAN
--commit to external | Parallel with PAN
--wait for pan (happening in fb_post) to finish.

Call MSMFB_OVERLAY_SET ioctl only when params change.

These thing together ensure a correct sequence and should fix tearing and
stuttering, the latter assuming there are no other display pipeline delays.

Acked-by: Arun Kumar K.R <akumarkr@codeaurora.org>

Change-Id: Ibb0ad8485fa6b30dc6ac07ae8b25a760941c08ce
This commit is contained in:
Saurabh Shah
2012-08-17 19:47:52 -07:00
committed by Iliyan Malchev
parent 94822ee87c
commit fc2acbe754
7 changed files with 66 additions and 14 deletions
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10
libgralloc/framebuffer.cpp
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@@ -136,6 +136,13 @@ static int fb_post(struct framebuffer_device_t* dev, buffer_handle_t buffer)
genlock_unlock_buffer(hnd);
return -errno;
}
//Signals the composition thread to unblock and loop over if necessary
pthread_mutex_lock(&m->fbPanLock);
m->fbPanDone = true;
pthread_cond_signal(&m->fbPanCond);
pthread_mutex_unlock(&m->fbPanLock);
CALC_FPS();
m->currentBuffer = hnd;
}
@@ -365,6 +372,9 @@ int mapFrameBufferLocked(struct private_module_t* module)
module->fbPostDone = false;
pthread_mutex_init(&(module->fbPostLock), NULL);
pthread_cond_init(&(module->fbPostCond), NULL);
module->fbPanDone = false;
pthread_mutex_init(&(module->fbPanLock), NULL);
pthread_cond_init(&(module->fbPanCond), NULL);
return 0;
}