From 2bbfe00147a7c075f5c43e657ec218afea662819 Mon Sep 17 00:00:00 2001 From: Douglas Anderson Date: Tue, 21 Jul 2015 13:41:23 -0700 Subject: [PATCH] clk: rockchip: Fix PLL bandwidth In the TRM we see that BWADJ is "a 12-bit bus that selects the values 1-4096 for the bandwidth divider (NB)": NB = BWADJ[11:0] + 1 The recommended setting of NB: NB = NF / 2. So: NB = NF / 2 BWADJ[11:0] + 1 = NF / 2 BWADJ[11:0] = NF / 2 - 1 Right now, we have: { \ .rate = _rate##U, \ .nr = _nr, \ .nf = _nf, \ .no = _no, \ .bwadj = (_nf >> 1), \ } That means we set bwadj to NF / 2, not NF / 2 - 1 All of this is a bit confusing because we specify "NR" (the 1-based value), "NF" (the 1-based value), "NO" (the 1-based value), but "BWADJ" (the 0-based value) instead of "NB" (the 1-based value). Let's change to working with "NB" and fix the off by one error. This may affect PLL jitter in a small way (hopefully for the better). Signed-off-by: Douglas Anderson Reviewed-by: Heiko Stuebner Signed-off-by: Stephen Boyd --- drivers/clk/rockchip/clk-pll.c | 18 +++++++++--------- drivers/clk/rockchip/clk-rk3188.c | 2 +- drivers/clk/rockchip/clk-rk3288.c | 2 +- drivers/clk/rockchip/clk.h | 8 ++++---- 4 files changed, 15 insertions(+), 15 deletions(-) diff --git a/drivers/clk/rockchip/clk-pll.c b/drivers/clk/rockchip/clk-pll.c index 1f88dd158b93..96903ae8b192 100644 --- a/drivers/clk/rockchip/clk-pll.c +++ b/drivers/clk/rockchip/clk-pll.c @@ -120,8 +120,8 @@ static int rockchip_pll_wait_lock(struct rockchip_clk_pll *pll) #define RK3066_PLLCON0_NR_SHIFT 8 #define RK3066_PLLCON1_NF_MASK 0x1fff #define RK3066_PLLCON1_NF_SHIFT 0 -#define RK3066_PLLCON2_BWADJ_MASK 0xfff -#define RK3066_PLLCON2_BWADJ_SHIFT 0 +#define RK3066_PLLCON2_NB_MASK 0xfff +#define RK3066_PLLCON2_NB_SHIFT 0 #define RK3066_PLLCON3_RESET (1 << 5) #define RK3066_PLLCON3_PWRDOWN (1 << 1) #define RK3066_PLLCON3_BYPASS (1 << 0) @@ -207,8 +207,8 @@ static int rockchip_rk3066_pll_set_rate(struct clk_hw *hw, unsigned long drate, writel_relaxed(HIWORD_UPDATE(rate->nf - 1, RK3066_PLLCON1_NF_MASK, RK3066_PLLCON1_NF_SHIFT), pll->reg_base + RK3066_PLLCON(1)); - writel_relaxed(HIWORD_UPDATE(rate->bwadj, RK3066_PLLCON2_BWADJ_MASK, - RK3066_PLLCON2_BWADJ_SHIFT), + writel_relaxed(HIWORD_UPDATE(rate->nb - 1, RK3066_PLLCON2_NB_MASK, + RK3066_PLLCON2_NB_SHIFT), pll->reg_base + RK3066_PLLCON(2)); /* leave reset and wait the reset_delay */ @@ -261,7 +261,7 @@ static void rockchip_rk3066_pll_init(struct clk_hw *hw) { struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw); const struct rockchip_pll_rate_table *rate; - unsigned int nf, nr, no, bwadj; + unsigned int nf, nr, no, nb; unsigned long drate; u32 pllcon; @@ -283,13 +283,13 @@ static void rockchip_rk3066_pll_init(struct clk_hw *hw) nf = ((pllcon >> RK3066_PLLCON1_NF_SHIFT) & RK3066_PLLCON1_NF_MASK) + 1; pllcon = readl_relaxed(pll->reg_base + RK3066_PLLCON(2)); - bwadj = (pllcon >> RK3066_PLLCON2_BWADJ_SHIFT) & RK3066_PLLCON2_BWADJ_MASK; + nb = ((pllcon >> RK3066_PLLCON2_NB_SHIFT) & RK3066_PLLCON2_NB_MASK) + 1; - pr_debug("%s: pll %s@%lu: nr (%d:%d); no (%d:%d); nf(%d:%d), bwadj(%d:%d)\n", + pr_debug("%s: pll %s@%lu: nr (%d:%d); no (%d:%d); nf(%d:%d), nb(%d:%d)\n", __func__, __clk_get_name(hw->clk), drate, rate->nr, nr, - rate->no, no, rate->nf, nf, rate->bwadj, bwadj); + rate->no, no, rate->nf, nf, rate->nb, nb); if (rate->nr != nr || rate->no != no || rate->nf != nf - || rate->bwadj != bwadj) { + || rate->nb != nb) { struct clk *parent = __clk_get_parent(hw->clk); unsigned long prate; diff --git a/drivers/clk/rockchip/clk-rk3188.c b/drivers/clk/rockchip/clk-rk3188.c index edbafbcabeb6..0abf22d14401 100644 --- a/drivers/clk/rockchip/clk-rk3188.c +++ b/drivers/clk/rockchip/clk-rk3188.c @@ -817,7 +817,7 @@ static void __init rk3188_clk_init(struct device_node *np) rate = pll->rate_table; while (rate->rate > 0) { - rate->bwadj = 0; + rate->nb = 1; rate++; } } diff --git a/drivers/clk/rockchip/clk-rk3288.c b/drivers/clk/rockchip/clk-rk3288.c index a8bad7d3a487..0df5bae9ddbf 100644 --- a/drivers/clk/rockchip/clk-rk3288.c +++ b/drivers/clk/rockchip/clk-rk3288.c @@ -84,7 +84,7 @@ static struct rockchip_pll_rate_table rk3288_pll_rates[] = { RK3066_PLL_RATE( 742500000, 8, 495, 2), RK3066_PLL_RATE( 696000000, 1, 58, 2), RK3066_PLL_RATE( 600000000, 1, 50, 2), - RK3066_PLL_RATE_BWADJ(594000000, 1, 198, 8, 1), + RK3066_PLL_RATE_NB(594000000, 1, 198, 8, 1), RK3066_PLL_RATE( 552000000, 1, 46, 2), RK3066_PLL_RATE( 504000000, 1, 84, 4), RK3066_PLL_RATE( 500000000, 3, 125, 2), diff --git a/drivers/clk/rockchip/clk.h b/drivers/clk/rockchip/clk.h index 93ea335f2653..dc8ecb2673b7 100644 --- a/drivers/clk/rockchip/clk.h +++ b/drivers/clk/rockchip/clk.h @@ -83,16 +83,16 @@ enum rockchip_pll_type { .nr = _nr, \ .nf = _nf, \ .no = _no, \ - .bwadj = ((_nf) >> 1), \ + .nb = ((_nf) < 2) ? 1 : (_nf) >> 1, \ } -#define RK3066_PLL_RATE_BWADJ(_rate, _nr, _nf, _no, _bw) \ +#define RK3066_PLL_RATE_NB(_rate, _nr, _nf, _no, _nb) \ { \ .rate = _rate##U, \ .nr = _nr, \ .nf = _nf, \ .no = _no, \ - .bwadj = _bw, \ + .nb = _nb, \ } struct rockchip_pll_rate_table { @@ -100,7 +100,7 @@ struct rockchip_pll_rate_table { unsigned int nr; unsigned int nf; unsigned int no; - unsigned int bwadj; + unsigned int nb; }; /** -- 2.30.2