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clk: qcom: clk-alpha-pll: Update set_rate for Zonda PLL

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The Zonda PLL has a 16 bit signed alpha and in the cases where the alpha
value is greater than 0.5, the L value needs to be adjusted accordingly.
Thus update the logic to handle the signed alpha val.

Fixes: f21b6bfecc ("clk: qcom: clk-alpha-pll: add support for zonda pll")
Cc: stable@vger.kernel.org
Signed-off-by: Satya Priya Kakitapalli <quic_skakitap@quicinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20240731062916.2680823-5-quic_skakitap@quicinc.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
This commit is contained in:
Satya Priya Kakitapalli 2024-07-31 11:59:12 +05:30 committed by Bjorn Andersson
parent 85e8ee59df
commit f4973130d2
1 changed files with 16 additions and 0 deletions
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16
drivers/clk/qcom/clk-alpha-pll.c
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@ -41,6 +41,7 @@
#define PLL_USER_CTL(p) ((p)->offset + (p)->regs[PLL_OFF_USER_CTL])
# define PLL_POST_DIV_SHIFT 8
# define PLL_POST_DIV_MASK(p) GENMASK((p)->width - 1, 0)
# define PLL_ALPHA_MSB BIT(15)
# define PLL_ALPHA_EN BIT(24)
# define PLL_ALPHA_MODE BIT(25)
# define PLL_VCO_SHIFT 20
@ -2117,6 +2118,18 @@ static void clk_zonda_pll_disable(struct clk_hw *hw)
regmap_write(regmap, PLL_OPMODE(pll), 0x0);
}
static void zonda_pll_adjust_l_val(unsigned long rate, unsigned long prate, u32 *l)
{
u64 remainder, quotient;
quotient = rate;
remainder = do_div(quotient, prate);
*l = quotient;
if ((remainder * 2) / prate)
*l = *l + 1;
}
static int clk_zonda_pll_set_rate(struct clk_hw *hw, unsigned long rate,
unsigned long prate)
{
@ -2133,6 +2146,9 @@ static int clk_zonda_pll_set_rate(struct clk_hw *hw, unsigned long rate,
if (ret < 0)
return ret;
if (a & PLL_ALPHA_MSB)
zonda_pll_adjust_l_val(rate, prate, &l);
regmap_write(pll->clkr.regmap, PLL_ALPHA_VAL(pll), a);
regmap_write(pll->clkr.regmap, PLL_L_VAL(pll), l);