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arm: ls1021atwr: optimize the deep sleep latency

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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>
This commit is contained in:
tang yuantian 2015-09-24 15:52:02 +08:00 committed by York Sun
parent 6ec9aef2ce
commit 0210a36988
2 changed files with 17 additions and 6 deletions
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4
board/freescale/common/arm_sleep.c
View file

@ -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

19
board/freescale/ls1021atwr/ls1021atwr.c
View file

@ -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