arm: ls1021atwr: optimize the deep sleep latency

It will take more than 1s when wake up from deep sleep. Most of the
time is spent on outputing information. This patch reduced the deep
sleep latency by:
1. avoid outputing system informaton
2. remove flush cache after DDR restore
3. skip reloading second stage uboot binary when SD boot

Signed-off-by: Tang Yuantian <Yuantian.Tang@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>

diff --git a/board/freescale/common/arm_sleep.c b/board/freescale/common/arm_sleep.c
index 8e8b7fa204ffa9ab2dd85b6f3f68bba8c3623a41..a498c65f040d35ff1172d9f109fe03fef754ccaf 100644 (file)
--- a/board/freescale/common/arm_sleep.c
+++ b/board/freescale/common/arm_sleep.c
@@ -12,7 +12,6 @@
 #include <asm/secure.h>
 #endif
 #include <asm/armv7.h>
-#include <asm/cache.h>
 
 #if defined(CONFIG_LS102XA)
 #include <asm/arch/immap_ls102xa.h>
@@ -65,8 +64,6 @@ static void dp_ddr_restore(void)
 
        for (i = 0; i < DDR_BUFF_LEN / 8; i++)
                *dst++ = *src++;
-
-       flush_dcache_all();
 }
 
 static void dp_resume_prepare(void)
@@ -74,7 +71,6 @@ static void dp_resume_prepare(void)
        dp_ddr_restore();
        board_sleep_prepare();
        armv7_init_nonsec();
-       cleanup_before_linux();
 #ifdef CONFIG_U_QE
        u_qe_resume();
 #endif

diff --git a/board/freescale/ls1021atwr/ls1021atwr.c b/board/freescale/ls1021atwr/ls1021atwr.c
index 445ea2424dc09283fcd2de8515e927231b2fdf70..4918c1192e2bd268cd6fd748853971445c049c77 100644 (file)
--- a/board/freescale/ls1021atwr/ls1021atwr.c
+++ b/board/freescale/ls1021atwr/ls1021atwr.c
@@ -436,8 +436,10 @@ int board_early_init_f(void)
        }
 
 #if defined(CONFIG_DEEP_SLEEP)
-       if (is_warm_boot())
-               fsl_dp_disable_console();
+       if (is_warm_boot()) {
+               timer_init();
+               dram_init();
+       }
 #endif
 
        return 0;
@@ -446,6 +448,8 @@ int board_early_init_f(void)
 #ifdef CONFIG_SPL_BUILD
 void board_init_f(ulong dummy)
 {
+       void (*second_uboot)(void);
+
        /* Clear the BSS */
        memset(__bss_start, 0, __bss_end - __bss_start);
 
@@ -466,6 +470,17 @@ void board_init_f(ulong dummy)
        enable_layerscape_ns_access();
 #endif
 
+       /*
+        * if it is woken up from deep sleep, then jump to second
+        * stage uboot and continue executing without recopying
+        * it from SD since it has already been reserved in memeory
+        * in last boot.
+        */
+       if (is_warm_boot()) {
+               second_uboot = (void (*)(void))CONFIG_SYS_TEXT_BASE;
+               second_uboot();
+       }
+
        board_init_r(NULL, 0);
 }
 #endif