LineageOS/android_vendor_qcom_opensource_display-commonsys-intf
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Invoke a padding round in certain use-cases.

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* In some use-cases, it is possible that there are
no AppBuffer layers on the external/virtual layer-list
during which all the pipes will be allocated to the
primary. When layers do comeup on external/virtual
layer-list, subsequent overlay sets fail.

* This change ensures that in such cases, we invoke a
padding round on all the displays to free up the
hw resources which can be used in subsequent cycles.

Change-Id: Ifac0b8f51a8719eb55b11010d05b8d11352db054
This commit is contained in:
Raj Kamal
2014-02-07 16:15:17 +05:30
parent 25154792a5
commit 9ed3d6b35e
4 changed files with 29 additions and 8 deletions
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15
libhwcomposer/hwc.cpp
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@@ -105,7 +105,10 @@ static void hwc_registerProcs(struct hwc_composer_device_1* dev,
//Helper
static void reset(hwc_context_t *ctx, int numDisplays,
hwc_display_contents_1_t** displays) {
ctx->numActiveDisplays = 0;
ctx->isPaddingRound = false;
for(int i = 0; i < numDisplays; i++) {
hwc_display_contents_1_t *list = displays[i];
// XXX:SurfaceFlinger no longer guarantees that this
@@ -125,6 +128,17 @@ static void reset(hwc_context_t *ctx, int numDisplays,
* the display device to be active.
*/
ctx->numActiveDisplays += 1;
if((ctx->mPrevHwLayerCount[i] == 1) and (list->numHwLayers > 1)) {
/* If the previous cycle for dpy 'i' has 0 AppLayers and the
* current cycle has atleast 1 AppLayer, padding round needs
* to be invoked on current cycle to free up the resources.
*/
ctx->isPaddingRound = true;
}
ctx->mPrevHwLayerCount[i] = list->numHwLayers;
} else {
ctx->mPrevHwLayerCount[i] = 0;
}
if(ctx->mFBUpdate[i])
@@ -133,7 +147,6 @@ static void reset(hwc_context_t *ctx, int numDisplays,
ctx->mCopyBit[i]->reset();
if(ctx->mLayerRotMap[i])
ctx->mLayerRotMap[i]->reset();
}
ctx->mAD->reset();