From f9d1324775a08c7892b31b26f24169e024b665ec Mon Sep 17 00:00:00 2001
From: Andre Przywara <andre.przywara@arm.com>
Date: Wed, 5 May 2021 13:53:05 +0100
Subject: [PATCH] sunxi: clock: H6/H616: Fix PLL clock factor encodings
Most clock factors and dividers in the H6 PLLs use a "+1 encoding",
which we were missing on two occasions.
This fixes the MMC clock setup on the H6, which could be slightly off due
to the wrong parent frequency:
mmc 2 set mod-clk req 52000000 parent 1176000000 n 2 m 12 rate 49000000
Also the CPU frequency (PLL1) was a tad too high before.
For PLL5 (DRAM) we already accounted for this +1, but in the DRAM code
itself, not in the bit field macro. Move this there to be aligned with
what the other SoCs and other PLLs do.
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Jernej Skrabec <jernej.skrabec@gmail.com>
---
arch/arm/include/asm/arch-sunxi/clock_sun50i_h6.h | 4 ++--
arch/arm/mach-sunxi/clock_sun50i_h6.c | 2 +-
arch/arm/mach-sunxi/dram_sun50i_h6.c | 2 +-
arch/arm/mach-sunxi/dram_sun50i_h616.c | 2 +-
4 files changed, 5 insertions(+), 5 deletions(-)
diff --git a/arch/arm/include/asm/arch-sunxi/clock_sun50i_h6.h b/arch/arm/include/asm/arch-sunxi/clock_sun50i_h6.h
index 62abfc4ef6..2e076cf594 100644
--- a/arch/arm/include/asm/arch-sunxi/clock_sun50i_h6.h
+++ b/arch/arm/include/asm/arch-sunxi/clock_sun50i_h6.h
@@ -233,14 +233,14 @@ struct sunxi_ccm_reg {
#define CCM_PLL1_OUT_EN BIT(27)
#define CCM_PLL1_CLOCK_TIME_2 (2 << 24)
#define CCM_PLL1_CTRL_P(p) ((p) << 16)
-#define CCM_PLL1_CTRL_N(n) ((n) << 8)
+#define CCM_PLL1_CTRL_N(n) (((n) - 1) << 8)
/* pll5 bit field */
#define CCM_PLL5_CTRL_EN BIT(31)
#define CCM_PLL5_LOCK_EN BIT(29)
#define CCM_PLL5_LOCK BIT(28)
#define CCM_PLL5_OUT_EN BIT(27)
-#define CCM_PLL5_CTRL_N(n) ((n) << 8)
+#define CCM_PLL5_CTRL_N(n) (((n) - 1) << 8)
#define CCM_PLL5_CTRL_DIV1(div1) ((div1) << 0)
#define CCM_PLL5_CTRL_DIV2(div0) ((div0) << 1)
diff --git a/arch/arm/mach-sunxi/clock_sun50i_h6.c b/arch/arm/mach-sunxi/clock_sun50i_h6.c
index 492fc4a3fc..a947463e0a 100644
--- a/arch/arm/mach-sunxi/clock_sun50i_h6.c
+++ b/arch/arm/mach-sunxi/clock_sun50i_h6.c
@@ -94,7 +94,7 @@ unsigned int clock_get_pll6(void)
int m = IS_ENABLED(CONFIG_MACH_SUN50I_H6) ? 4 : 2;
uint32_t rval = readl(&ccm->pll6_cfg);
- int n = ((rval & CCM_PLL6_CTRL_N_MASK) >> CCM_PLL6_CTRL_N_SHIFT);
+ int n = ((rval & CCM_PLL6_CTRL_N_MASK) >> CCM_PLL6_CTRL_N_SHIFT) + 1;
int div1 = ((rval & CCM_PLL6_CTRL_DIV1_MASK) >>
CCM_PLL6_CTRL_DIV1_SHIFT) + 1;
int div2 = ((rval & CCM_PLL6_CTRL_DIV2_MASK) >>
diff --git a/arch/arm/mach-sunxi/dram_sun50i_h6.c b/arch/arm/mach-sunxi/dram_sun50i_h6.c
index 32ec0bc4cd..d05375c902 100644
--- a/arch/arm/mach-sunxi/dram_sun50i_h6.c
+++ b/arch/arm/mach-sunxi/dram_sun50i_h6.c
@@ -171,7 +171,7 @@ static void mctl_sys_init(struct dram_para *para)
/* Set PLL5 rate to doubled DRAM clock rate */
writel(CCM_PLL5_CTRL_EN | CCM_PLL5_LOCK_EN |
- CCM_PLL5_CTRL_N(para->clk * 2 / 24 - 1), &ccm->pll5_cfg);
+ CCM_PLL5_CTRL_N(para->clk * 2 / 24), &ccm->pll5_cfg);
mctl_await_completion(&ccm->pll5_cfg, CCM_PLL5_LOCK, CCM_PLL5_LOCK);
/* Configure DRAM mod clock */
diff --git a/arch/arm/mach-sunxi/dram_sun50i_h616.c b/arch/arm/mach-sunxi/dram_sun50i_h616.c
index ef5876971c..acdfb3ceef 100644
--- a/arch/arm/mach-sunxi/dram_sun50i_h616.c
+++ b/arch/arm/mach-sunxi/dram_sun50i_h616.c
@@ -113,7 +113,7 @@ static void mctl_sys_init(struct dram_para *para)
/* Set PLL5 rate to doubled DRAM clock rate */
writel(CCM_PLL5_CTRL_EN | CCM_PLL5_LOCK_EN | CCM_PLL5_OUT_EN |
- CCM_PLL5_CTRL_N(para->clk * 2 / 24 - 1), &ccm->pll5_cfg);
+ CCM_PLL5_CTRL_N(para->clk * 2 / 24), &ccm->pll5_cfg);
mctl_await_completion(&ccm->pll5_cfg, CCM_PLL5_LOCK, CCM_PLL5_LOCK);
/* Configure DRAM mod clock */
--
2.39.5