On 09/24/2015 12:52 AM, Tang Yuantian wrote:
> 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.t...@freescale.com>
> ---
> board/freescale/common/arm_sleep.c | 4 ----
> board/freescale/ls1021atwr/ls1021atwr.c | 19 +++++++++++++++++--
> 2 files changed, 17 insertions(+), 6 deletions(-)
>
> diff --git a/board/freescale/common/arm_sleep.c
> b/board/freescale/common/arm_sleep.c
> index 8e8b7fa..a498c65 100644
> --- 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 228dbf8..236376b 100644
> --- a/board/freescale/ls1021atwr/ls1021atwr.c
> +++ b/board/freescale/ls1021atwr/ls1021atwr.c
> @@ -521,8 +521,10 @@ 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;
> @@ -531,6 +533,8 @@ 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);
>
> @@ -551,6 +555,17 @@ void board_init_f(ulong dummy)
> enable_devices_ns_access(&ns_dev[7], 1);
> #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
>
Yuantian,
Please explain more why the second stage u-boot is reserved? Wouldn't Linux
overwrite the memory?
York
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