diff options
Diffstat (limited to 'drivers/clk/sunxi-ng/ccu-sun50i-h616.c')
| -rw-r--r-- | drivers/clk/sunxi-ng/ccu-sun50i-h616.c | 46 |
1 files changed, 30 insertions, 16 deletions
diff --git a/drivers/clk/sunxi-ng/ccu-sun50i-h616.c b/drivers/clk/sunxi-ng/ccu-sun50i-h616.c index 84e406ddf9d1..b001d0c03534 100644 --- a/drivers/clk/sunxi-ng/ccu-sun50i-h616.c +++ b/drivers/clk/sunxi-ng/ccu-sun50i-h616.c @@ -216,19 +216,29 @@ static struct ccu_nkmp pll_de_clk = { }; /* - * TODO: Determine SDM settings for the audio PLL. The manual suggests - * PLL_FACTOR_N=16, PLL_POST_DIV_P=2, OUTPUT_DIV=2, pattern=0xe000c49b - * for 24.576 MHz, and PLL_FACTOR_N=22, PLL_POST_DIV_P=3, OUTPUT_DIV=2, - * pattern=0xe001288c for 22.5792 MHz. - * This clashes with our fixed PLL_POST_DIV_P. + * Sigma-delta modulation settings table obtained from the vendor SDK driver. + * There are additional M0 and M1 divider bits not modelled here, so forced to + * fixed values in the probe routine. Sigma-delta modulation allows providing a + * fractional-N divider in the PLL, to help reaching those specific + * frequencies with less error. */ +static struct ccu_sdm_setting pll_audio_sdm_table[] = { + { .rate = 90316800, .pattern = 0xc001288d, .m = 3, .n = 22 }, + { .rate = 98304000, .pattern = 0xc001eb85, .m = 5, .n = 40 }, +}; + #define SUN50I_H616_PLL_AUDIO_REG 0x078 static struct ccu_nm pll_audio_hs_clk = { .enable = BIT(31), .lock = BIT(28), .n = _SUNXI_CCU_MULT_MIN(8, 8, 12), - .m = _SUNXI_CCU_DIV(1, 1), /* input divider */ + .m = _SUNXI_CCU_DIV(16, 6), + .sdm = _SUNXI_CCU_SDM(pll_audio_sdm_table, + BIT(24), 0x178, BIT(31)), + .fixed_post_div = 2, .common = { + .features = CCU_FEATURE_FIXED_POSTDIV | + CCU_FEATURE_SIGMA_DELTA_MOD, .reg = 0x078, .hw.init = CLK_HW_INIT("pll-audio-hs", "osc24M", &ccu_nm_ops, @@ -685,18 +695,20 @@ static const struct clk_hw *clk_parent_pll_audio[] = { }; /* - * The divider of pll-audio is fixed to 24 for now, so 24576000 and 22579200 - * rates can be set exactly in conjunction with sigma-delta modulation. + * The PLL_AUDIO_4X clock defaults to 24.5714 MHz according to the manual, with + * a final divider of 1. The 2X and 1X clocks use 2 and 4 respectively. The 1x + * clock is set to either 24576000 or 22579200 for 48Khz and 44.1Khz (and + * multiples). */ static CLK_FIXED_FACTOR_HWS(pll_audio_1x_clk, "pll-audio-1x", clk_parent_pll_audio, - 96, 1, CLK_SET_RATE_PARENT); + 4, 1, CLK_SET_RATE_PARENT); static CLK_FIXED_FACTOR_HWS(pll_audio_2x_clk, "pll-audio-2x", clk_parent_pll_audio, - 48, 1, CLK_SET_RATE_PARENT); + 2, 1, CLK_SET_RATE_PARENT); static CLK_FIXED_FACTOR_HWS(pll_audio_4x_clk, "pll-audio-4x", clk_parent_pll_audio, - 24, 1, CLK_SET_RATE_PARENT); + 1, 1, CLK_SET_RATE_PARENT); static const struct clk_hw *pll_periph0_parents[] = { &pll_periph0_clk.common.hw @@ -990,7 +1002,7 @@ static struct clk_hw_onecell_data sun50i_h616_hw_clks = { .num = CLK_NUMBER, }; -static struct ccu_reset_map sun50i_h616_ccu_resets[] = { +static const struct ccu_reset_map sun50i_h616_ccu_resets[] = { [RST_MBUS] = { 0x540, BIT(30) }, [RST_BUS_DE] = { 0x60c, BIT(16) }, @@ -1136,12 +1148,14 @@ static int sun50i_h616_ccu_probe(struct platform_device *pdev) } /* - * Force the post-divider of pll-audio to 12 and the output divider - * of it to 2, so 24576000 and 22579200 rates can be set exactly. + * Set the output-divider for the pll-audio clocks (M0) to 2 and the + * input divider (M1) to 1 as recommended by the manual when using + * SDM. */ val = readl(reg + SUN50I_H616_PLL_AUDIO_REG); - val &= ~(GENMASK(21, 16) | BIT(0)); - writel(val | (11 << 16) | BIT(0), reg + SUN50I_H616_PLL_AUDIO_REG); + val &= ~BIT(1); + val |= BIT(0); + writel(val, reg + SUN50I_H616_PLL_AUDIO_REG); /* * First clock parent (osc32K) is unusable for CEC. But since there |