hwc: FPS property to show compositor performance

Use setprop debug.hwc.showfps 1 to show the average frames per second
displayed over the last 8 compositions.

debug.hwc.showfps can be set dynamically, the overhead of accessing Android
properties should be minor i.e. an access to an mmap'd() file, so this
should not be a significant overhead to composition when disabled.

Reworked from p-ics-mr1:
9ea53ce HWC: debug.hwc.showfps Android property shows current FPS
66a531d hwc: enable debug.hwc.showfps to be set dynamically

Change-Id: Ie2303e6ae9e73f38cf563d6ed6079928054e4c16
Signed-off-by: Tony Lofthouse <a0741364@ti.com>
(cherry picked from commit 69400d18d6cfc7b2b55b5a563b1fd4387887ded4)

Conflicts:

	hwc/hwc.c

1 files changed, 28 insertions, 1 deletions

diff --git a/hwc/hwc.c b/hwc/hwc.c
index e6c63d0..81eaf66 100644
--- a/hwc/hwc.c
+++ b/hwc/hwc.c
@@ -36,6 +36,7 @@
 #include <EGL/egl.h>
 #include <hardware_legacy/uevent.h>
 #include <png.h>
+#include <utils/Timers.h>
 
 #include <system/graphics.h>
 #include <linux/bltsville.h>
@@ -228,10 +229,33 @@ typedef struct omap4_hwc_device omap4_hwc_device_t;
 static int debug = 0;
 static int debugpost2 = 0;
 static int debugblt = 0;
-static int gshowfps;
 static rgz_t grgz;
 static struct bvsurfgeom gscrngeom;
 
+static void showfps(void)
+{
+    static int framecount = 0;
+    static int lastframecount = 0;
+    static nsecs_t lastfpstime = 0;
+    static float fps = 0;
+    char value[PROPERTY_VALUE_MAX];
+
+    property_get("debug.hwc.showfps", value, "0");
+    if (!atoi(value)) {
+        return;
+    }
+
+    framecount++;
+    if (!(framecount & 0x7)) {
+        nsecs_t now = systemTime(SYSTEM_TIME_MONOTONIC);
+        nsecs_t diff = now - lastfpstime;
+        fps = ((framecount - lastframecount) * (float)(s2ns(1))) / diff;
+        lastfpstime = now;
+        lastframecount = framecount;
+        ALOGI("%d Frames, %f FPS", framecount, fps);
+    }
+}
+
 static void dump_layer(hwc_layer_1_t const* l)
 {
     ALOGD("\ttype=%d, flags=%08x, handle=%p, tr=%02x, blend=%04x, {%d,%d,%d,%d}, {%d,%d,%d,%d}",
@@ -1933,6 +1957,8 @@ static int omap4_hwc_set(struct hwc_composer_device_1 *dev,
                                  hwc_dev->buffers,
                                  nbufs,
                                  dsscomp, omaplfb_comp_data_sz);
+        showfps();
+
 #if 0
         if (!hwc_dev->use_sgx) {
             __u32 crt = 0;
@@ -2768,6 +2794,7 @@ static int omap4_hwc_device_open(const hw_module_t* module, const char* name,
         ALOGW("Invalid upscaled_nv12_limit (%s), setting to 2.", value);
         hwc_dev->upscaled_nv12_limit = 2.;
     }
+
 done:
     if (err && hwc_dev) {
         if (hwc_dev->dsscomp_fd >= 0)