From a994b3deb00bf3177cdf9f92060baec4f640f466 Mon Sep 17 00:00:00 2001 From: Shengzhou Liu Date: Wed, 16 Dec 2015 16:45:41 +0800 Subject: driver/ddr/fsl: Add workaround for A009663 Erratum A-009663 workaround requires to set DDR_INTERVAL[BSTOPRE] to 0 before setting DDR_SDRAM_CFG[MEM_EN] and set DDR_INTERVAL[BSTOPRE] to the desired value after DDR initialization has completed. When DDR controller is configured to operate in auto-precharge mode(DDR_INTERVAL[BSTOPRE]=0), this workaround is not needed. Signed-off-by: Shengzhou Liu Reviewed-by: York Sun --- drivers/ddr/fsl/fsl_ddr_gen4.c | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'drivers/ddr/fsl') diff --git a/drivers/ddr/fsl/fsl_ddr_gen4.c b/drivers/ddr/fsl/fsl_ddr_gen4.c index 0d9dd0bb46..6f76980d31 100644 --- a/drivers/ddr/fsl/fsl_ddr_gen4.c +++ b/drivers/ddr/fsl/fsl_ddr_gen4.c @@ -155,7 +155,12 @@ void fsl_ddr_set_memctl_regs(const fsl_ddr_cfg_regs_t *regs, ddr_out32(&ddr->sdram_mode_15, regs->ddr_sdram_mode_15); ddr_out32(&ddr->sdram_mode_16, regs->ddr_sdram_mode_16); ddr_out32(&ddr->sdram_md_cntl, regs->ddr_sdram_md_cntl); +#ifdef CONFIG_SYS_FSL_ERRATUM_A009663 + ddr_out32(&ddr->sdram_interval, + regs->ddr_sdram_interval & ~SDRAM_INTERVAL_BSTOPRE); +#else ddr_out32(&ddr->sdram_interval, regs->ddr_sdram_interval); +#endif ddr_out32(&ddr->sdram_data_init, regs->ddr_data_init); ddr_out32(&ddr->ddr_wrlvl_cntl, regs->ddr_wrlvl_cntl); #ifndef CONFIG_SYS_FSL_DDR_EMU @@ -397,6 +402,11 @@ step2: if (timeout <= 0) printf("Waiting for D_INIT timeout. Memory may not work.\n"); + +#ifdef CONFIG_SYS_FSL_ERRATUM_A009663 + ddr_out32(&ddr->sdram_interval, regs->ddr_sdram_interval); +#endif + #ifdef CONFIG_DEEP_SLEEP if (is_warm_boot()) { /* exit self-refresh */ -- cgit v1.2.1