diff options
| author | Alif Zakuan Yuslaimi <alif.zakuan.yuslaimi@altera.com> | 2025-08-03 18:24:41 -0700 |
|---|---|---|
| committer | Tien Fong Chee <tien.fong.chee@intel.com> | 2025-08-08 22:20:49 +0800 |
| commit | 1e354de7fc36c5cf1f7e77c5dca4713100fbb503 (patch) | |
| tree | 2660cc7036772b739c487e0961f12991f05d3d36 /drivers/ddr/altera/sdram_agilex.c | |
| parent | 209d53eb1b486776dd1a7ad7f8611083fff7ad26 (diff) | |
ddr: altera: agilex: Get ACF from boot scratch register
The DDR data rate must be set correctly in the DDRIOCTRL
register according to the Actual Clock Frequency (ACF) value.
By enabling the reading of ACF value from bit 18 of the boot
scratch register during initialization, the DDR data rate is
able to be configured accurately.
Signed-off-by: Alif Zakuan Yuslaimi <alif.zakuan.yuslaimi@altera.com>
Reviewed-by: Tien Fong Chee <tien.fong.chee@altera.com>
Diffstat (limited to 'drivers/ddr/altera/sdram_agilex.c')
| -rw-r--r-- | drivers/ddr/altera/sdram_agilex.c | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/drivers/ddr/altera/sdram_agilex.c b/drivers/ddr/altera/sdram_agilex.c index e4655877a78..b36a765a5de 100644 --- a/drivers/ddr/altera/sdram_agilex.c +++ b/drivers/ddr/altera/sdram_agilex.c @@ -73,12 +73,22 @@ int sdram_mmr_init_full(struct udevice *dev) */ /* Configure DDR IO size x16, x32 and x64 mode */ u32 update_value; + u32 reg; update_value = hmc_readl(plat, NIOSRESERVED0); update_value = (update_value & 0xFF) >> 5; - /* Configure DDR data rate 0-HAlf-rate 1-Quarter-rate */ - update_value |= (hmc_readl(plat, CTRLCFG3) & 0x4); + /* Read ACF from boot_scratch_cold_8 register bit[18]*/ + reg = readl(socfpga_get_sysmgr_addr() + + SYSMGR_SOC64_BOOT_SCRATCH_COLD8); + reg = ((reg & SYSMGR_SCRATCH_REG_8_ACF_DDR_RATE_MASK) + >> SYSMGR_SCRATCH_REG_8_ACF_DDR_RATE_SHIFT); + + /* bit-2 of DDRIOCTRL: Configure DDR data rate 0-Half-rate 1-Quarter-rate */ + clrsetbits_le32(&update_value, + DDR_HMC_DDRIOCTRL_MPFE_HMCA_DATA_RATE_MSK, + reg << DDR_HMC_DDRIOCTRL_MPFE_HMCA_DATA_RATE_SHIFT); + hmc_ecc_writel(plat, update_value, DDRIOCTRL); /* Copy values MMR IOHMC dramaddrw to HMC adp DRAMADDRWIDTH */ |