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ram: rk3399: Conduct memory training at 400MHz

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Currently the default initialisation frequency is 50MHz.  Although
this does appear to be suitable for some LPDDR4 RAM chips, training at
this low frequency has been seen to cause Column errors, leading to
Capacity check errors on others.

Here we force RAM initialisation to happen at 400MHz before ramping up
to the final value running value of 800MHz after everything has been
successfully configured.

Link: https://lore.kernel.org/u-boot/Yo4v3jUeHXTovjOH@google.com/
Suggested-by: YouMin Chen <cym@rock-chips.com>
Signed-off-by: Lee Jones <lee@kernel.org>
Tested-by: Xavier Drudis Ferran <xdrudis@tinet.cat>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
Tested-by: Michal Suchánek <msuchanek@suse.de>
This commit is contained in:
Lee Jones 2022-08-11 08:58:48 +01:00 committed by Kever Yang
parent daef678cff
commit 337e92e79c
1 changed files with 21 additions and 15 deletions
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36
drivers/ram/rockchip/sdram_rk3399.c
View file

@ -85,7 +85,7 @@ struct sdram_rk3399_ops {
int (*data_training_first)(struct dram_info *dram, u32 channel, u8 rank,
struct rk3399_sdram_params *sdram);
int (*set_rate_index)(struct dram_info *dram,
struct rk3399_sdram_params *params);
struct rk3399_sdram_params *params, u32 ctl_fn);
void (*modify_param)(const struct chan_info *chan,
struct rk3399_sdram_params *params);
struct rk3399_sdram_params *
@ -1644,7 +1644,8 @@ static int data_training_first(struct dram_info *dram, u32 channel, u8 rank,
}
static int switch_to_phy_index1(struct dram_info *dram,
struct rk3399_sdram_params *params)
struct rk3399_sdram_params *params,
u32 unused)
{
u32 channel;
u32 *denali_phy;
@ -2539,26 +2540,25 @@ static int lpddr4_set_ctl(struct dram_info *dram,
}
static int lpddr4_set_rate(struct dram_info *dram,
struct rk3399_sdram_params *params)
struct rk3399_sdram_params *params,
u32 ctl_fn)
{
u32 ctl_fn;
u32 phy_fn;
for (ctl_fn = 0; ctl_fn < 2; ctl_fn++) {
phy_fn = lpddr4_get_phy_fn(params, ctl_fn);
phy_fn = lpddr4_get_phy_fn(params, ctl_fn);
lpddr4_set_phy(dram, params, phy_fn, &dfs_cfgs_lpddr4[ctl_fn]);
lpddr4_set_ctl(dram, params, ctl_fn,
dfs_cfgs_lpddr4[ctl_fn].base.ddr_freq);
lpddr4_set_phy(dram, params, phy_fn, &dfs_cfgs_lpddr4[ctl_fn]);
lpddr4_set_ctl(dram, params, ctl_fn,
dfs_cfgs_lpddr4[ctl_fn].base.ddr_freq);
if (IS_ENABLED(CONFIG_RAM_ROCKCHIP_DEBUG))
printf("%s: change freq to %dMHz %d, %d\n", __func__,
dfs_cfgs_lpddr4[ctl_fn].base.ddr_freq / MHz,
ctl_fn, phy_fn);
}
if (IS_ENABLED(CONFIG_RAM_ROCKCHIP_DEBUG))
printf("%s: change freq to %dMHz %d, %d\n", __func__,
dfs_cfgs_lpddr4[ctl_fn].base.ddr_freq / MHz,
ctl_fn, phy_fn);
return 0;
}
#endif /* CONFIG_RAM_RK3399_LPDDR4 */
/* CS0,n=1
@ -2955,6 +2955,12 @@ static int sdram_init(struct dram_info *dram,
params->ch[ch].cap_info.rank = rank;
}
#if defined(CONFIG_RAM_RK3399_LPDDR4)
/* LPDDR4 needs to be trained at 400MHz */
lpddr4_set_rate(dram, params, 0);
params->base.ddr_freq = dfs_cfgs_lpddr4[0].base.ddr_freq / MHz;
#endif
params->base.num_channels = 0;
for (channel = 0; channel < 2; channel++) {
const struct chan_info *chan = &dram->chan[channel];
@ -3005,7 +3011,7 @@ static int sdram_init(struct dram_info *dram,
params->base.stride = calculate_stride(params);
dram_all_config(dram, params);
ret = dram->ops->set_rate_index(dram, params);
ret = dram->ops->set_rate_index(dram, params, 1);
if (ret)
return ret;