From 5fc62fe57097e195a8047859cd3c278a5d6790b6 Mon Sep 17 00:00:00 2001 From: Shengzhou Liu Date: Wed, 16 Mar 2016 13:50:23 +0800 Subject: driver/ddr/fsl: Add workaround for erratum A-009801 The initial training for the DDRC may provide results that are not optimized. The workaround provides better read timing margins. Signed-off-by: Shengzhou Liu Reviewed-by: York Sun --- drivers/ddr/fsl/fsl_ddr_gen4.c | 7 +++++++ 1 file changed, 7 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 7cdb7008b4..1dc0631440 100644 --- a/drivers/ddr/fsl/fsl_ddr_gen4.c +++ b/drivers/ddr/fsl/fsl_ddr_gen4.c @@ -251,6 +251,13 @@ void fsl_ddr_set_memctl_regs(const fsl_ddr_cfg_regs_t *regs, } #endif +#ifdef CONFIG_SYS_FSL_ERRATUM_A009801 + temp32 = ddr_in32(&ddr->debug[25]); + temp32 &= ~DDR_CAS_TO_PRE_SUB_MASK; + temp32 |= 9 << DDR_CAS_TO_PRE_SUB_SHIFT; + ddr_out32(&ddr->debug[25], temp32); +#endif + #ifdef CONFIG_SYS_FSL_ERRATUM_A009942 ddr_freq = get_ddr_freq(ctrl_num) / 1000000; tmp = ddr_in32(&ddr->debug[28]); -- cgit v1.2.1