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SubjectRe: [PATCH 6/6] clk: qcom: Fix APSS PLL and RCG Configuration
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On 13. 01. 2023. 16:20, Konrad Dybcio wrote:
>
> On 13.01.2023 15:36, devi priya wrote:
>> Included CLK_IS_CRITICAL flag which helps to properly enable
>> the APSS PLL during bootup.
> Please describe the issue and not only the user-visible impact it
> makes. Does the PLL get shut down by clk_ignore_unused? Maybe you
> would be interested in the sync_state changes that landed in recent
> -next that may solve it for you?
>
> I don't think it should be always-on, as you have an alternate source
> for low power modes, adding CLK_IS_CRITICAL will keep the PLL enabled
> even if you're not using it.

I have the same opinion, as this is working fine on IPQ6018 and IPQ8074
and I have not experienced any issues with it.

>
>> clk_rcg2_ops should be used for APSS clock RCG, as other ops
>> will not configure the RCG register
> RCG register meaning RCG register*s*, meaning in this case M/N/D
> which would be required for proper rate setting and not only input
> switching (which arguably doesn't seem to be of much concern on a
> single-parent clock)? This all is not obvious..
Same question from me as well, why do you need clk_rcg2_ops with
a dummy frequency table since this is just a mux using RCG2 control
bits?

Regards,
Robert
>
> Konrad
>> Co-developed-by: Praveenkumar I <quic_ipkumar@quicinc.com>
>> Signed-off-by: Praveenkumar I <quic_ipkumar@quicinc.com>
>> Signed-off-by: devi priya <quic_devipriy@quicinc.com>
>> ---
>> drivers/clk/qcom/apss-ipq-pll.c | 1 +
>> drivers/clk/qcom/apss-ipq6018.c | 8 +++++++-
>> 2 files changed, 8 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/clk/qcom/apss-ipq-pll.c b/drivers/clk/qcom/apss-ipq-pll.c
>> index dd0c01bf5a98..75486a124fcd 100644
>> --- a/drivers/clk/qcom/apss-ipq-pll.c
>> +++ b/drivers/clk/qcom/apss-ipq-pll.c
>> @@ -33,6 +33,7 @@ static struct clk_alpha_pll ipq_pll = {
>> },
>> .num_parents = 1,
>> .ops = &clk_alpha_pll_huayra_ops,
>> + .flags = CLK_IS_CRITICAL,
>> },
>> },
>> };
>> diff --git a/drivers/clk/qcom/apss-ipq6018.c b/drivers/clk/qcom/apss-ipq6018.c
>> index f2f502e2d5a4..0d0e7196a4dc 100644
>> --- a/drivers/clk/qcom/apss-ipq6018.c
>> +++ b/drivers/clk/qcom/apss-ipq6018.c
>> @@ -33,15 +33,21 @@ static const struct parent_map parents_apcs_alias0_clk_src_map[] = {
>> { P_APSS_PLL_EARLY, 5 },
>> };
>>
>> +static const struct freq_tbl ftbl_apcs_alias0_clk_src[] = {
>> + { .src = P_APSS_PLL_EARLY, .pre_div = 1 },
>> + { }
>> +};
>> +
>> static struct clk_rcg2 apcs_alias0_clk_src = {
>> .cmd_rcgr = 0x0050,
>> + .freq_tbl = ftbl_apcs_alias0_clk_src,
>> .hid_width = 5,
>> .parent_map = parents_apcs_alias0_clk_src_map,
>> .clkr.hw.init = &(struct clk_init_data){
>> .name = "apcs_alias0_clk_src",
>> .parent_data = parents_apcs_alias0_clk_src,
>> .num_parents = ARRAY_SIZE(parents_apcs_alias0_clk_src),
>> - .ops = &clk_rcg2_mux_closest_ops,
>> + .ops = &clk_rcg2_ops,
>> .flags = CLK_SET_RATE_PARENT,
>> },
>> };
>

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