From 6995a2893718a54cbd255ea3dd9b6d7306e30cf2 Mon Sep 17 00:00:00 2001 From: "Satyanarayana, Sandhya" Date: Thu, 9 Aug 2012 18:29:57 +0000 Subject: [PATCH] am33xx evm: Update secure_emif_sdram_config during ddr init This patch updates secure_emif_sdram_config with the same value written to sdram_config during ddr3 initialization. During suspend/resume, this value is copied into sdram_config. With this, a write to sdram_config at the end of resume sequence which triggers an init sequence can be avoided. Without this register write in place, the DDR_RESET line goes low for a few cycles during resume which is a violation of the JEDEC spec. Signed-off-by: Satyanarayana, Sandhya --- arch/arm/cpu/armv7/am33xx/ddr.c | 5 ++++- arch/arm/include/asm/arch-am33xx/cpu.h | 2 ++ arch/arm/include/asm/arch-am33xx/sys_proto.h | 1 + 3 files changed, 7 insertions(+), 1 deletion(-) diff --git a/arch/arm/cpu/armv7/am33xx/ddr.c b/arch/arm/cpu/armv7/am33xx/ddr.c index cffd4abcf7..fd9fc4a720 100644 --- a/arch/arm/cpu/armv7/am33xx/ddr.c +++ b/arch/arm/cpu/armv7/am33xx/ddr.c @@ -17,6 +17,7 @@ http://www.ti.com/ #include #include +#include #include #include @@ -46,8 +47,10 @@ void config_sdram(const struct emif_regs *regs) { writel(regs->ref_ctrl, &emif_reg->emif_sdram_ref_ctrl); writel(regs->ref_ctrl, &emif_reg->emif_sdram_ref_ctrl_shdw); - if (regs->zq_config) + if (regs->zq_config){ writel(regs->zq_config, &emif_reg->emif_zq_config); + writel(regs->sdram_config, &cstat->secure_emif_sdram_config); + } writel(regs->sdram_config, &emif_reg->emif_sdram_config); } diff --git a/arch/arm/include/asm/arch-am33xx/cpu.h b/arch/arm/include/asm/arch-am33xx/cpu.h index de9ee91496..6cfbef76a7 100644 --- a/arch/arm/include/asm/arch-am33xx/cpu.h +++ b/arch/arm/include/asm/arch-am33xx/cpu.h @@ -234,6 +234,8 @@ struct vtp_reg { struct ctrl_stat { unsigned int resv1[16]; unsigned int statusreg; /* ofset 0x40 */ + unsigned int resv2[51]; + unsigned int secure_emif_sdram_config; /* offset 0x0110 */ }; /* AM33XX GPIO registers */ diff --git a/arch/arm/include/asm/arch-am33xx/sys_proto.h b/arch/arm/include/asm/arch-am33xx/sys_proto.h index 8a4b24839f..819ea650f0 100644 --- a/arch/arm/include/asm/arch-am33xx/sys_proto.h +++ b/arch/arm/include/asm/arch-am33xx/sys_proto.h @@ -46,6 +46,7 @@ u32 get_sysboot_value(void); int print_cpuinfo(void); #endif +extern struct ctrl_stat *cstat; u32 get_device_type(void); void setup_clocks_for_console(void); void ddr_pll_config(unsigned int ddrpll_M); -- 2.25.1