linux-kernel - Re: [PATCH V3 2/5] clk: qcom: Remove support to set CAL

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Date:   Fri, 9 Jun 2023 17:19:19 +0530
From:   Jagadeesh Kona <quic_jkona@...cinc.com>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        "Michael Turquette" <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        "Rob Herring" <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>
CC:     Bjorn Andersson <andersson@...nel.org>,
        Vladimir Zapolskiy <vladimir.zapolskiy@...aro.org>,
        Vinod Koul <vkoul@...nel.org>, <linux-arm-msm@...r.kernel.org>,
        <linux-clk@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, Taniya Das <quic_tdas@...cinc.com>,
        Satya Priya Kakitapalli <quic_skakitap@...cinc.com>,
        Imran Shaik <quic_imrashai@...cinc.com>,
        Ajit Pandey <quic_ajipan@...cinc.com>
Subject: Re: [PATCH V3 2/5] clk: qcom: Remove support to set CAL_L field in
 lucid evo pll configure

Hi Dmitry,

Thanks for your review!

On 6/1/2023 8:16 PM, Dmitry Baryshkov wrote:
> On 01/06/2023 17:34, Jagadeesh Kona wrote:
>> For lucid evo and ole pll's the CAL_L, RINGOSC_CAL_L and L_VAL are
>> part of the same register, hence update the l configuration value
>> to include these fields across all the chipsets.
>>
>> Since the l configuration value now includes both L and CAL_L fields,
>> there is no need to explicitly set CAL_L field again in lucid evo pll
>> configure, Hence remove support to explicity set CAL_L field for evo pll.
>>
>> Fixes: 260e36606a03 ("clk: qcom: clk-alpha-pll: add Lucid EVO PLL 
>> configuration interfaces")
>> Signed-off-by: Taniya Das <quic_tdas@...cinc.com>
>> Signed-off-by: Jagadeesh Kona <quic_jkona@...cinc.com>
>> ---
>> Changes since V2:
>>   - Squashed update L val and remove explicit cal_l configuration to 
>> single patch
>>   - Updated L configuration for gpucc-sm8450 as well which was merged 
>> recently
>> Changes since V1:
>>   - Newly added.
>>
>>   drivers/clk/qcom/camcc-sm8450.c  | 24 ++++++++++++++++--------
>>   drivers/clk/qcom/clk-alpha-pll.c |  6 +-----
>>   drivers/clk/qcom/dispcc-sm8450.c |  6 ++++--
>>   drivers/clk/qcom/dispcc-sm8550.c |  6 ++++--
>>   drivers/clk/qcom/gpucc-sa8775p.c |  6 ++++--
>>   drivers/clk/qcom/gpucc-sm8450.c  |  6 ++++--
>>   6 files changed, 33 insertions(+), 21 deletions(-)
> 
> I'd say, this is still not a correct solution from my point of view. A 
> correct solution would be to follow the existing code and use constants 
> for the constant values (of CAL_L, and RINGOSC_CAL_L).
> 

Sure, will keep the existing code as is and will remove this patch in 
the next series.

>>
>> diff --git a/drivers/clk/qcom/camcc-sm8450.c 
>> b/drivers/clk/qcom/camcc-sm8450.c
>> index 51338a2884d2..6a5a08f88598 100644
>> --- a/drivers/clk/qcom/camcc-sm8450.c
>> +++ b/drivers/clk/qcom/camcc-sm8450.c
>> @@ -57,7 +57,8 @@ static const struct pll_vco rivian_evo_vco[] = {
>>   static const struct clk_parent_data pll_parent_data_tcxo = { .index 
>> = DT_BI_TCXO };
>>   static const struct alpha_pll_config cam_cc_pll0_config = {
>> -    .l = 0x3e,
>> +    /* .l includes CAL_L_VAL, L_VAL fields */
>> +    .l = 0x0044003e,
>>       .alpha = 0x8000,
>>       .config_ctl_val = 0x20485699,
>>       .config_ctl_hi_val = 0x00182261,
>> @@ -128,7 +129,8 @@ static struct clk_alpha_pll_postdiv 
>> cam_cc_pll0_out_odd = {
>>   };

[skipped]

Thanks & Regards,
Jagadeesh