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Android亮屏速度分析總結(jié)

 更新時(shí)間:2019年02月01日 11:33:39   作者:碼農(nóng)-嵌入式Linux  
今天小編就為大家分享一篇關(guān)于Android亮屏速度分析總結(jié),小編覺(jué)得內(nèi)容挺不錯(cuò)的,現(xiàn)在分享給大家,具有很好的參考價(jià)值,需要的朋友一起跟隨小編來(lái)看看吧

前面聊的

最近在調(diào)試項(xiàng)目的亮屏速度,我們希望在按下power鍵后到亮屏這個(gè)時(shí)間能達(dá)到500MS以?xún)?nèi),在Rockchip 3399和3288上面的時(shí)間都不能達(dá)到要求,因此引發(fā)了一系列的調(diào)試之路。

計(jì)算按下power鍵到亮屏的時(shí)間

Android 喚醒時(shí)間統(tǒng)計(jì)

剛開(kāi)始的時(shí)候,我只在android階段統(tǒng)計(jì)時(shí)間,也能看到時(shí)間的差異,但是不是最準(zhǔn)確的,我統(tǒng)計(jì)的時(shí)間日志如下

01-18 09:13:40.992 683 772 D SurfaceControl: Excessive delay in setPowerMode(): 743ms
01-18 09:13:45.304 683 772 D SurfaceControl: Excessive delay in setPowerMode(): 757ms
01-18 09:13:49.559 683 772 D SurfaceControl: Excessive delay in setPowerMode(): 725ms
01-18 09:18:27.461 683 772 D SurfaceControl: Excessive delay in setPowerMode(): 741ms
01-18 09:18:32.766 683 772 D SurfaceControl: Excessive delay in setPowerMode(): 743ms
01-18 09:18:35.861 683 772 D SurfaceControl: Excessive delay in setPowerMode(): 745ms
01-18 09:18:38.345 683 772 D SurfaceControl: Excessive delay in setPowerMode(): 733ms

Kernel從Power到亮屏的時(shí)間統(tǒng)計(jì)

后來(lái)同事中的精英古總在他的代碼上加入了從按下Power鍵到亮屏的時(shí)間,直接通過(guò)printk打印,代碼如下

diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
old mode 100644
new mode 100755
index 17c3b94..2b39662
--- a/drivers/gpu/drm/panel/panel-simple.c
+++ b/drivers/gpu/drm/panel/panel-simple.c
@@ -504,6 +504,7 @@ static int panel_simple_enable(struct drm_panel *panel)
    }
    p->enabled = true;
+    printk("%s exit\n", __func__);
    return 0;
 }
diff --git a/drivers/input/keyboard/rk_keys.c b/drivers/input/keyboard/rk_keys.c
old mode 100644
new mode 100755
index fed5ced..537b599
--- a/drivers/input/keyboard/rk_keys.c
+++ b/drivers/input/keyboard/rk_keys.c
@@ -134,6 +134,10 @@ static void keys_timer(unsigned long _data)
        key_dbg(pdata, "%skey[%s]: report event[%d] state[%d]\n",
            button->type == TYPE_ADC ? "adc" : "gpio",
            button->desc, button->code, button->state);
+        if(strcmp(button->desc, "power") == 0)
+        printk("%skey[%s]: report event[%d] state[%d]\n",
+            button->type == TYPE_ADC ? "adc" : "gpio",
+            button->desc, button->code, button->state);
        input_event(input, EV_KEY, button->code, button->state);
        input_sync(input);
    }

統(tǒng)計(jì)每個(gè)驅(qū)動(dòng)的resume函數(shù)調(diào)用時(shí)間

上面的時(shí)間對(duì)我們調(diào)試非常有用,然后就需要細(xì)分到每個(gè)驅(qū)動(dòng)的resume函數(shù)執(zhí)行的時(shí)間,用的方法是我之前寫(xiě)過(guò)的,大概統(tǒng)計(jì)了下TP,LCD,sensor的resume時(shí)間,發(fā)現(xiàn)TP和LCD占用的時(shí)間非常多,然后跟同事一起看了下,同事把TP resume里面的代碼用工作隊(duì)列實(shí)現(xiàn)后速度明顯有了提升。

然后有很長(zhǎng)一段時(shí)間不知道干嘛,向打印其他每個(gè)驅(qū)動(dòng)的resume時(shí)間,一直沒(méi)找到方法,后面看到一個(gè)代碼,非常有用。

kernel/drivers/base/power/main.c

static void dpm_show_time(ktime_t starttime, pm_message_t state, char *info)                            
{        
  ktime_t calltime;
  u64 usecs64;
  int usecs;
  calltime = ktime_get();
  usecs64 = ktime_to_ns(ktime_sub(calltime, starttime));
  do_div(usecs64, NSEC_PER_USEC);
  usecs = usecs64;
  if (usecs == 0)
    usecs = 1; 
  pr_info("PM: %s%s%s of devices complete after %ld.%03ld msecs\n",
    info ?: "", info ? " " : "", pm_verb(state.event),
    usecs / USEC_PER_MSEC, usecs % USEC_PER_MSEC);
}

這個(gè)函數(shù)用來(lái)打印resume的函數(shù)消耗的時(shí)間,但是如何去觸發(fā)打印這個(gè)函數(shù)呢?

  • 一定保證設(shè)備進(jìn)入深度睡眠,串口也進(jìn)入深度睡眠,沒(méi)有任何打印后。
  • 執(zhí)行以下命令
echo N > /sys/module/printk/parameters/console_suspend
//使控制臺(tái)在suspend最后才關(guān)閉,這樣可以打印出休眠過(guò)程完整信息
echo 1 > /sys/power/pm_print_times
//使能調(diào)試變量

打印的LOG類(lèi)似下面的

[ 37.031413] bcmsdh_sdmmc_resume Exit
[ 37.082174] PM: resume of devices complete after 78.589 msecs
[ 37.085277] [BT_RFKILL]: ** disable irq
[ 37.087645] Restarting tasks ... 

修改Lcd配置減小resume時(shí)間

古總在調(diào)試過(guò)程中展現(xiàn)了非常厲害的功底,第一步就是修改了LCD的參數(shù),讓亮屏?xí)r間加快。修改如下

--- a/arch/arm/boot/dts/rk3288-pad.dts
+++ b/arch/arm/boot/dts/rk3288-pad.dts
@@ -169,10 +169,10 @@
        dsi,lanes = <4>;
        prepare-delay-ms = <20>;
-        init-delay-ms = <20>;
-        enable-delay-ms = <100>;
-        disable-delay-ms = <20>;
-        unprepare-delay-ms = <20>;
+        //init-delay-ms = <20>;
+        enable-delay-ms = <1>;
+        disable-delay-ms = <1>;
+        unprepare-delay-ms = <1>;
        panel-init-sequence = [
            15 32 02 8F A5
            15 01 02 83 00

修改DRM 超時(shí)時(shí)間減小喚醒時(shí)間

這是最關(guān)鍵的,DRM框架非常復(fù)雜,RK也是從開(kāi)源的DRM移植過(guò)來(lái)使用,在DRM部分有個(gè)時(shí)間導(dǎo)致問(wèn)題,最終跟RK拿到最新的patch讓喚醒時(shí)間直接加速500MS.

我們?cè)谌罩鞠掳l(fā)現(xiàn)問(wèn)題,并給詢(xún)問(wèn)了RK,最終發(fā)現(xiàn)這部分代碼沒(méi)有更新到最新的部分。

hi rk:
為什么亮屏的時(shí)候有時(shí)候會(huì)打印這句VOP等待超時(shí)?請(qǐng)問(wèn)下這是什么意思。
[ 1211.293492] rockchip-vop ff930000.vop: wait win close timeout
[ 1211.293514] rockchip-vop ff930000.vop: [drm:vop_crtc_enable] Update mode to 1200*1920, close all win
有時(shí)候卻不會(huì)打印。

[ 1216.423283] rockchip-vop ff930000.vop: [drm:vop_crtc_enable] Update mode to 12001920, close all win [ 1223.899741] rockchip-vop ff930000.vop: [drm:vop_crtc_enable] Update mode to 12001920, close all win
[ 1234.386252] rockchip-vop ff930000.vop: [drm:vop_crtc_enable] Update mode to 1200*1920, close all win

代碼如下

--- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
@@ -139,6 +139,9 @@
 #define to_vop_win(x) container_of(x, struct vop_win, base)
 #define to_vop_plane_state(x) container_of(x, struct vop_plane_state, base)
+/*add by VENDOR_PATCH for seep up the drm vop driver at 2018/1/18 for RK Defect #191554, VENDOR_PATCH PAD100-193*/
+#define VENDOR_PATCH
+
 struct vop_zpos {
    int win_id;
    int zpos;
@@ -868,9 +871,15 @@ static void vop_disable_all_planes(struct vop *vop)
    vop_disable_allwin(vop);
    vop_cfg_done(vop);
+#ifdef VENDOR_PATCH
    ret = readx_poll_timeout_atomic(vop_is_allwin_disabled,
                    vop, active, active,
+                    0, 100 * 1000);
+#else
+    ret = readx_poll_timeout_atomic(vop_is_allwin_disabled,
+                vop, active, active,
                    0, 500 * 1000);
+#endif
    if (ret)
        dev_err(vop->dev, "wait win close timeout\n");
 }
@@ -2215,20 +2224,36 @@ static size_t vop_crtc_bandwidth(struct drm_crtc *crtc,
    u16 htotal = adjusted_mode->crtc_htotal;
    u16 vdisplay = adjusted_mode->crtc_vdisplay;
    int clock = adjusted_mode->crtc_clock;
+#ifndef VENDOR_PATCH
    struct vop *vop = to_vop(crtc);
    const struct vop_data *vop_data = vop->data;
+#endif
    struct vop_plane_state *vop_plane_state;
    struct drm_plane_state *pstate;
    struct vop_bandwidth *pbandwidth;
    struct drm_plane *plane;
    u64 bandwidth;
    int i, cnt = 0;
+#ifdef VENDOR_PATCH
+    int plane_num = 0;
+#endif
    if (!htotal || !vdisplay)
        return 0;
+#ifndef VENDOR_PATCH
    pbandwidth = kmalloc_array(vop_data->win_size, sizeof(*pbandwidth),
                  GFP_KERNEL);
+#else
+    for_each_plane_in_state(state, plane, pstate, i) {
+        if (pstate->crtc != crtc || !pstate->fb)
+            continue;
+        plane_num++;
+    }
+    pbandwidth = kmalloc_array(plane_num, sizeof(*pbandwidth),
+                 GFP_KERNEL);
+#endif
+
    if (!pbandwidth)
        return -ENOMEM;
@@ -2421,7 +2446,10 @@ static void vop_crtc_enable(struct drm_crtc *crtc)
    rockchip_set_system_status(sys_status);
    mutex_lock(&vop->vop_lock);
    vop_initial(crtc);
-
+#ifdef VENDOR_PATCH
+    vop_disable_allwin(vop);
+    VOP_CTRL_SET(vop, standby, 0);
+#endif
    VOP_CTRL_SET(vop, dclk_pol, 1);
    val = (adjusted_mode->flags & DRM_MODE_FLAG_NHSYNC) ?
          0 : BIT(HSYNC_POSITIVE);
@@ -2549,8 +2577,9 @@ static void vop_crtc_enable(struct drm_crtc *crtc)
    /*
     * enable vop, all the register would take effect when vop exit standby
     */
+#ifndef VENDOR_PATCH
    VOP_CTRL_SET(vop, standby, 0);
-
+#endif
    enable_irq(vop->irq);
    drm_crtc_vblank_on(crtc);
    mutex_unlock(&vop->vop_lock);

休眠喚醒流程圖

從網(wǎng)上拷貝了個(gè)休眠喚醒的流程圖,如果以后有問(wèn)題需要分析的話,可以跟進(jìn)這個(gè)流程去排查。

總結(jié)

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