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| author | Shengzhou Liu <Shengzhou.Liu@freescale.com> | 2016-01-06 11:26:51 +0800 |
|---|---|---|
| committer | York Sun <york.sun@nxp.com> | 2016-01-25 08:24:14 -0800 |
| commit | 0d3972cfcd6dff18d110d2ee01ad99e3623bfd45 (patch) | |
| tree | cf44538dad352ebcedef94d99a03c432f6d736e8 /drivers/ddr | |
| parent | 12f229ea8f6c8e20f8fd07906eafc853c4c354a9 (diff) | |
| download | u-boot-imx-0d3972cfcd6dff18d110d2ee01ad99e3623bfd45.zip u-boot-imx-0d3972cfcd6dff18d110d2ee01ad99e3623bfd45.tar.gz u-boot-imx-0d3972cfcd6dff18d110d2ee01ad99e3623bfd45.tar.bz2 | |
fsl/ddr: Add workaround for ERRATUM_A009942
During the receive data training, the DDRC may complete on a
non-optimal setting that could lead to data corruption or
initialization failure.
Workaround: before setting MEM_EN, set DEBUG_29 register with
specific value for different data rates.
Signed-off-by: Shengzhou Liu <Shengzhou.Liu@freescale.com>
Reviewed-by: York Sun <york.sun@nxp.com>
Diffstat (limited to 'drivers/ddr')
| -rw-r--r-- | drivers/ddr/fsl/fsl_ddr_gen4.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/ddr/fsl/fsl_ddr_gen4.c b/drivers/ddr/fsl/fsl_ddr_gen4.c index 3fca5c2..0d9dd0b 100644 --- a/drivers/ddr/fsl/fsl_ddr_gen4.c +++ b/drivers/ddr/fsl/fsl_ddr_gen4.c @@ -55,6 +55,10 @@ void fsl_ddr_set_memctl_regs(const fsl_ddr_cfg_regs_t *regs, u32 vref_seq2[3] = {0xc0, 0xf0, 0x70}; /* for range 2 */ u32 *vref_seq = vref_seq1; #endif +#ifdef CONFIG_SYS_FSL_ERRATUM_A009942 + ulong ddr_freq; + u32 tmp; +#endif #ifdef CONFIG_FSL_DDR_BIST u32 mtcr, err_detect, err_sbe; u32 cs0_bnds, cs1_bnds, cs2_bnds, cs3_bnds, cs0_config; @@ -227,6 +231,20 @@ void fsl_ddr_set_memctl_regs(const fsl_ddr_cfg_regs_t *regs, ddr_out32(&ddr->debug[25], 0x9000); } #endif + +#ifdef CONFIG_SYS_FSL_ERRATUM_A009942 + ddr_freq = get_ddr_freq(ctrl_num) / 1000000; + tmp = ddr_in32(&ddr->debug[28]); + if (ddr_freq <= 1333) + ddr_out32(&ddr->debug[28], tmp | 0x0080006a); + else if (ddr_freq <= 1600) + ddr_out32(&ddr->debug[28], tmp | 0x0070006f); + else if (ddr_freq <= 1867) + ddr_out32(&ddr->debug[28], tmp | 0x00700076); + else if (ddr_freq <= 2133) + ddr_out32(&ddr->debug[28], tmp | 0x0060007b); +#endif + /* * For RDIMMs, JEDEC spec requires clocks to be stable before reset is * deasserted. Clocks start when any chip select is enabled and clock |