Re: [PATCH V4 1/8] clk: qcom: clk-alpha-pll: Fix CAL_L_VAL override for LUCID EVO PLL

[Konrad Dybcio <konrad.dybcio@linaro.org>]

On 6/11/24 15:37, Ajit Pandey wrote:
> In LUCID EVO PLL CAL_L_VAL and L_VAL bitfields are part of single
> PLL_L_VAL register. Update for L_VAL bitfield values in PLL_L_VAL
> register using regmap_write() API in __alpha_pll_trion_set_rate
> callback will override LUCID EVO PLL initial configuration related
> to PLL_CAL_L_VAL bit fields in PLL_L_VAL register.
> 
> Observed random PLL lock failures during PLL enable due to such
> override in PLL calibration value. Use regmap_update_bits() with
> L_VAL bitfield mask instead of regmap_write() API to update only
> PLL_L_VAL bitfields in __alpha_pll_trion_set_rate callback.
> 
> Fixes: 260e36606a03 ("clk: qcom: clk-alpha-pll: add Lucid EVO PLL configuration interfaces")
> Cc: stable@vger.kernel.org
> Signed-off-by: Ajit Pandey <quic_ajipan@quicinc.com>
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
> ---
>   drivers/clk/qcom/clk-alpha-pll.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/clk/qcom/clk-alpha-pll.c b/drivers/clk/qcom/clk-alpha-pll.c
> index c51647e37df8..a538559caaa0 100644
> --- a/drivers/clk/qcom/clk-alpha-pll.c
> +++ b/drivers/clk/qcom/clk-alpha-pll.c
> @@ -1665,7 +1665,7 @@ static int __alpha_pll_trion_set_rate(struct clk_hw *hw, unsigned long rate,
>   	if (ret < 0)
>   		return ret;
>   
> -	regmap_write(pll->clkr.regmap, PLL_L_VAL(pll), l);
> +	regmap_update_bits(pll->clkr.regmap, PLL_L_VAL(pll), LUCID_EVO_PLL_L_VAL_MASK,  l);

Since you're altering a function used by LUCID and TRION PLLs.. how will
that affect non-LUCID_EVO/OLE ones?

Konrad