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 8e8b7fa..a498c65 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 445ea24..4918c11 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