Messages in this thread Patch in this message | | | From | <> | Subject | Re: [PATCHv2] clk:aspeed:Fix AST2600 hpll calculate formula | Date | Mon, 13 Sep 2021 05:26:27 +0000 |
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On 08.09.2021 12:18, Ryan Chen wrote: > EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe > > AST2600 HPLL calculate formula [SCU200] > HPLL Numerator(M): have fixed value depend on SCU strap. > M = SCU500[10] ? 0x5F : SCU500[8] ? 0xBF : SCU200[12:0] > > if SCU500[10] = 1, M=0x5F. > else if SCU500[10]=0 & SCU500[8]=1, M=0xBF. > others (SCU510[10]=0 and SCU510[8]=0) > depend on SCU200[12:0] (default 0x8F) register setting. > > HPLL Denumerator (N) = SCU200[18:13] (default 0x2) > HPLL Divider (P) = SCU200[22:19] (default 0x0) > > Fixes: d3d04f6c330a ("clk: Add support for AST2600 SoC") > Signed-off-by: Ryan Chen <ryan_chen@aspeedtech.com> > --- > drivers/clk/clk-ast2600.c | 29 ++++++++++++++++++++++++++++- > 1 file changed, 28 insertions(+), 1 deletion(-) > > diff --git a/drivers/clk/clk-ast2600.c b/drivers/clk/clk-ast2600.c > index 085d0a18b2b6..5d8c46bcf237 100644 > --- a/drivers/clk/clk-ast2600.c > +++ b/drivers/clk/clk-ast2600.c > @@ -169,6 +169,33 @@ static const struct clk_div_table ast2600_div_table[] = { > }; > > /* For hpll/dpll/epll/mpll */ > +static struct clk_hw *ast2600_calc_hpll(const char *name, u32 val) > +{ > + unsigned int mult, div; > + u32 hwstrap = readl(scu_g6_base + ASPEED_G6_STRAP1); > + > + if (val & BIT(24)) { > + /* Pass through mode */ > + mult = div = 1; > + } else { > + /* F = 25Mhz * [(M + 2) / (n + 1)] / (p + 1) */ > + u32 m = val & 0x1fff; > + u32 n = (val >> 13) & 0x3f; > + u32 p = (val >> 19) & 0xf; > + > + if (hwstrap & BIT(10)) > + m = 0x5F; > + else { > + if (hwstrap & BIT(8))
You may write it directly: else if (hwstrap & BIT(8))
> + m = 0xBF; > + } > + mult = (m + 1) / (n + 1); > + div = (p + 1); > + } > + return clk_hw_register_fixed_factor(NULL, name, "clkin", 0, > + mult, div); > +}; > + > static struct clk_hw *ast2600_calc_pll(const char *name, u32 val) > { > unsigned int mult, div; > @@ -716,7 +743,7 @@ static void __init aspeed_g6_cc(struct regmap *map) > * and we assume that it is enabled > */ > regmap_read(map, ASPEED_HPLL_PARAM, &val); > - aspeed_g6_clk_data->hws[ASPEED_CLK_HPLL] = ast2600_calc_pll("hpll", val); > + aspeed_g6_clk_data->hws[ASPEED_CLK_HPLL] = ast2600_calc_hpll("hpll", val); > > regmap_read(map, ASPEED_MPLL_PARAM, &val); > aspeed_g6_clk_data->hws[ASPEED_CLK_MPLL] = ast2600_calc_pll("mpll", val); > -- > 2.17.1 >
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