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ram: k3-ddrss: Allow use of dt provided initial frequency 

Allow device tree to provide ti,ddr-freq0 to be used as the initial DDR
frequency that is set for lpddr4 before initialization of the
controller. Make this optional and continue to use bypass frequency if
ti,ddr-freq0 is not provided.

Signed-off-by: Dave Gerlach <d-gerlach@ti.com>
[praneeth@ti.com: fix minor build error]
Signed-off-by: Praneeth Bajjuri <praneeth@ti.com>
This commit is contained in:
Dave Gerlach 2021-06-11 09:39:09 -05:00 committed by Praneeth Bajjuri
parent c66dd9b846
commit d7ca60b875
1 changed files with 11 additions and 5 deletions
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16
drivers/ram/k3-ddrss/k3-ddrss.c
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@ -35,6 +35,7 @@ struct k3_ddrss_desc {
struct power_domain ddrdata_pwrdmn;
struct clk ddr_clk;
struct clk osc_clk;
u32 ddr_freq0;
u32 ddr_freq1;
u32 ddr_freq2;
u32 ddr_fhs_cnt;
@ -124,9 +125,7 @@ static void k3_lpddr4_freq_update(void)
else if (req_type == 2)
clk_set_rate(&ddrss->ddr_clk, ddrss->ddr_freq2);
else if (req_type == 0)
/* Put DDR pll in bypass mode */
clk_set_rate(&ddrss->ddr_clk,
clk_get_rate(&ddrss->osc_clk));
clk_set_rate(&ddrss->ddr_clk, ddrss->ddr_freq0);
else
printf("%s: Invalid freq request type\n", __func__);
@ -175,8 +174,7 @@ static int k3_ddrss_init_freq(struct k3_ddrss_desc *ddrss)
ret = clk_set_rate(&ddrss->ddr_clk, ddrss->ddr_freq1);
break;
case DENALI_CTL_0_DRAM_CLASS_LPDDR4:
/* Set to bypass frequency for LPDDR4*/
ret = clk_set_rate(&ddrss->ddr_clk, clk_get_rate(&ddrss->osc_clk));
ret = clk_set_rate(&ddrss->ddr_clk, ddrss->ddr_freq0);
break;
default:
ret = -EINVAL;
@ -274,6 +272,14 @@ static int k3_ddrss_ofdata_to_priv(struct udevice *dev)
if (ret)
dev_err(dev, "clk get failed for osc clk %d\n", ret);
ret = dev_read_u32(dev, "ti,ddr-freq0", &ddrss->ddr_freq0);
if (ret) {
ddrss->ddr_freq0 = clk_get_rate(&ddrss->osc_clk);
dev_dbg(dev,
"ddr freq0 not populated, using bypass frequency.\n",
ret);
}
ret = dev_read_u32(dev, "ti,ddr-freq1", &ddrss->ddr_freq1);
if (ret)
dev_err(dev, "ddr freq1 not populated %d\n", ret);