linux-kernel - Re: [PATCH RFT v2 11/14] clk: qcom: smd-rpm: Hook up PCNoC_0 keep

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Date:   Wed, 22 Mar 2023 09:05:21 +0100
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Bjorn Andersson <andersson@...nel.org>
Cc:     Andy Gross <agross@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        devicetree@...r.kernel.org
Subject: Re: [PATCH RFT v2 11/14] clk: qcom: smd-rpm: Hook up PCNoC_0
 keep_alive



On 22.03.2023 04:19, Bjorn Andersson wrote:
> On Wed, Mar 08, 2023 at 10:35:27PM +0100, Konrad Dybcio wrote:
>> 14 [1] of our 18 supported platforms need an active keepalive vote on
>> PCNoC_0 so as not to cause havoc on the entire SoC. Guarantee that.
>>
> 
> Given that these are all clocks for peripheral (or peripheral & config)
> noc clocks, doesn't this just ensure that the running CPU is able to
> reach something on the peripheral bus?
> 
> That is, are you encoding a active-only keep-alive interconnect path?
> Could we somehow express that using the interconnect driver on top
> instead?
Qualcomm downstream has a different notion of "keep_alive" on the msm_bus
side, which is basically:

if (bus->keepalive)
	active_vote_freq = max(19200000, aggregated_rate);

Considering that they're doing essentially the same thing, I suppose both
periph/config NoC could be enabled there instead.

Konrad

> 
> Regards,
> Bjorn
> 
>> [1] there are 13 changes to driver data, but 8226 reuses 8974.
>>
>> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
>> ---
>>  drivers/clk/qcom/clk-smd-rpm.c | 27 ++++++++++++++-------------
>>  1 file changed, 14 insertions(+), 13 deletions(-)
>>
>> diff --git a/drivers/clk/qcom/clk-smd-rpm.c b/drivers/clk/qcom/clk-smd-rpm.c
>> index 8e25b3d7d30c..a44b52bd0c83 100644
>> --- a/drivers/clk/qcom/clk-smd-rpm.c
>> +++ b/drivers/clk/qcom/clk-smd-rpm.c
>> @@ -500,6 +500,7 @@ DEFINE_CLK_SMD_RPM(aggre1_noc, QCOM_SMD_RPM_AGGR_CLK, 1);
>>  DEFINE_CLK_SMD_RPM(aggre2_noc, QCOM_SMD_RPM_AGGR_CLK, 2);
>>  
>>  DEFINE_CLK_SMD_RPM_BUS(pcnoc, 0);
>> +DEFINE_CLK_SMD_RPM_BUS_KEEP_ALIVE(pcnoc, 0);
>>  DEFINE_CLK_SMD_RPM_BUS(snoc, 1);
>>  DEFINE_CLK_SMD_RPM_BUS(sysmmnoc, 2);
>>  DEFINE_CLK_SMD_RPM_BUS(cnoc, 2);
>> @@ -558,7 +559,7 @@ DEFINE_CLK_SMD_RPM_XO_BUFFER(div_clk3, 13, 19200000);
>>  
>>  static struct clk_smd_rpm *msm8909_clks[] = {
>>  	[RPM_SMD_PCNOC_CLK]		= &clk_smd_rpm_bus_0_pcnoc_clk,
>> -	[RPM_SMD_PCNOC_A_CLK]		= &clk_smd_rpm_bus_0_pcnoc_a_clk,
>> +	[RPM_SMD_PCNOC_A_CLK]		= &clk_smd_rpm_bus_0_pcnoc_a_keep_alive_clk,
>>  	[RPM_SMD_SNOC_CLK]		= &clk_smd_rpm_bus_1_snoc_clk,
>>  	[RPM_SMD_SNOC_A_CLK]		= &clk_smd_rpm_bus_1_snoc_a_clk,
>>  	[RPM_SMD_BIMC_CLK]		= &clk_smd_rpm_bimc_clk,
>> @@ -592,7 +593,7 @@ static const struct rpm_smd_clk_desc rpm_clk_msm8909 = {
>>  
>>  static struct clk_smd_rpm *msm8916_clks[] = {
>>  	[RPM_SMD_PCNOC_CLK]		= &clk_smd_rpm_bus_0_pcnoc_clk,
>> -	[RPM_SMD_PCNOC_A_CLK]		= &clk_smd_rpm_bus_0_pcnoc_a_clk,
>> +	[RPM_SMD_PCNOC_A_CLK]		= &clk_smd_rpm_bus_0_pcnoc_a_keep_alive_clk,
>>  	[RPM_SMD_SNOC_CLK]		= &clk_smd_rpm_bus_1_snoc_clk,
>>  	[RPM_SMD_SNOC_A_CLK]		= &clk_smd_rpm_bus_1_snoc_a_clk,
>>  	[RPM_SMD_BIMC_CLK]		= &clk_smd_rpm_bimc_clk,
>> @@ -626,7 +627,7 @@ static struct clk_smd_rpm *msm8936_clks[] = {
>>  	[RPM_SMD_XO_CLK_SRC]		= &clk_smd_rpm_branch_bi_tcxo,
>>  	[RPM_SMD_XO_A_CLK_SRC]		= &clk_smd_rpm_branch_bi_tcxo_a,
>>  	[RPM_SMD_PCNOC_CLK]		= &clk_smd_rpm_bus_0_pcnoc_clk,
>> -	[RPM_SMD_PCNOC_A_CLK]		= &clk_smd_rpm_bus_0_pcnoc_a_clk,
>> +	[RPM_SMD_PCNOC_A_CLK]		= &clk_smd_rpm_bus_0_pcnoc_a_keep_alive_clk,
>>  	[RPM_SMD_SNOC_CLK]		= &clk_smd_rpm_bus_1_snoc_clk,
>>  	[RPM_SMD_SNOC_A_CLK]		= &clk_smd_rpm_bus_1_snoc_a_clk,
>>  	[RPM_SMD_BIMC_CLK]		= &clk_smd_rpm_bimc_clk,
>> @@ -660,7 +661,7 @@ static const struct rpm_smd_clk_desc rpm_clk_msm8936 = {
>>  
>>  static struct clk_smd_rpm *msm8974_clks[] = {
>>  	[RPM_SMD_PNOC_CLK]		= &clk_smd_rpm_bus_0_pcnoc_clk,
>> -	[RPM_SMD_PNOC_A_CLK]		= &clk_smd_rpm_bus_0_pcnoc_a_clk,
>> +	[RPM_SMD_PNOC_A_CLK]		= &clk_smd_rpm_bus_0_pcnoc_a_keep_alive_clk,
>>  	[RPM_SMD_SNOC_CLK]		= &clk_smd_rpm_bus_1_snoc_clk,
>>  	[RPM_SMD_SNOC_A_CLK]		= &clk_smd_rpm_bus_1_snoc_a_clk,
>>  	[RPM_SMD_CNOC_CLK]		= &clk_smd_rpm_bus_2_cnoc_clk,
>> @@ -712,7 +713,7 @@ static struct clk_smd_rpm *msm8976_clks[] = {
>>  	[RPM_SMD_XO_CLK_SRC] = &clk_smd_rpm_branch_bi_tcxo,
>>  	[RPM_SMD_XO_A_CLK_SRC] = &clk_smd_rpm_branch_bi_tcxo_a,
>>  	[RPM_SMD_PCNOC_CLK] = &clk_smd_rpm_bus_0_pcnoc_clk,
>> -	[RPM_SMD_PCNOC_A_CLK] = &clk_smd_rpm_bus_0_pcnoc_a_clk,
>> +	[RPM_SMD_PCNOC_A_CLK] = &clk_smd_rpm_bus_0_pcnoc_a_keep_alive_clk,
>>  	[RPM_SMD_SNOC_CLK] = &clk_smd_rpm_bus_1_snoc_clk,
>>  	[RPM_SMD_SNOC_A_CLK] = &clk_smd_rpm_bus_1_snoc_a_clk,
>>  	[RPM_SMD_BIMC_CLK] = &clk_smd_rpm_bimc_clk,
>> @@ -746,7 +747,7 @@ static struct clk_smd_rpm *msm8992_clks[] = {
>>  	[RPM_SMD_XO_CLK_SRC] = &clk_smd_rpm_branch_bi_tcxo,
>>  	[RPM_SMD_XO_A_CLK_SRC] = &clk_smd_rpm_branch_bi_tcxo_a,
>>  	[RPM_SMD_PNOC_CLK] = &clk_smd_rpm_bus_0_pcnoc_clk,
>> -	[RPM_SMD_PNOC_A_CLK] = &clk_smd_rpm_bus_0_pcnoc_a_clk,
>> +	[RPM_SMD_PNOC_A_CLK] = &clk_smd_rpm_bus_0_pcnoc_a_keep_alive_clk,
>>  	[RPM_SMD_OCMEMGX_CLK] = &clk_smd_rpm_ocmemgx_clk,
>>  	[RPM_SMD_OCMEMGX_A_CLK] = &clk_smd_rpm_ocmemgx_a_clk,
>>  	[RPM_SMD_BIMC_CLK] = &clk_smd_rpm_bimc_clk,
>> @@ -804,7 +805,7 @@ static struct clk_smd_rpm *msm8994_clks[] = {
>>  	[RPM_SMD_XO_CLK_SRC] = &clk_smd_rpm_branch_bi_tcxo,
>>  	[RPM_SMD_XO_A_CLK_SRC] = &clk_smd_rpm_branch_bi_tcxo_a,
>>  	[RPM_SMD_PNOC_CLK] = &clk_smd_rpm_bus_0_pcnoc_clk,
>> -	[RPM_SMD_PNOC_A_CLK] = &clk_smd_rpm_bus_0_pcnoc_a_clk,
>> +	[RPM_SMD_PNOC_A_CLK] = &clk_smd_rpm_bus_0_pcnoc_a_keep_alive_clk,
>>  	[RPM_SMD_OCMEMGX_CLK] = &clk_smd_rpm_ocmemgx_clk,
>>  	[RPM_SMD_OCMEMGX_A_CLK] = &clk_smd_rpm_ocmemgx_a_clk,
>>  	[RPM_SMD_BIMC_CLK] = &clk_smd_rpm_bimc_clk,
>> @@ -864,7 +865,7 @@ static struct clk_smd_rpm *msm8996_clks[] = {
>>  	[RPM_SMD_XO_CLK_SRC] = &clk_smd_rpm_branch_bi_tcxo,
>>  	[RPM_SMD_XO_A_CLK_SRC] = &clk_smd_rpm_branch_bi_tcxo_a,
>>  	[RPM_SMD_PCNOC_CLK] = &clk_smd_rpm_bus_0_pcnoc_clk,
>> -	[RPM_SMD_PCNOC_A_CLK] = &clk_smd_rpm_bus_0_pcnoc_a_clk,
>> +	[RPM_SMD_PCNOC_A_CLK] = &clk_smd_rpm_bus_0_pcnoc_a_keep_alive_clk,
>>  	[RPM_SMD_SNOC_CLK] = &clk_smd_rpm_bus_1_snoc_clk,
>>  	[RPM_SMD_SNOC_A_CLK] = &clk_smd_rpm_bus_1_snoc_a_clk,
>>  	[RPM_SMD_CNOC_CLK] = &clk_smd_rpm_bus_2_cnoc_clk,
>> @@ -918,7 +919,7 @@ static struct clk_smd_rpm *qcs404_clks[] = {
>>  	[RPM_SMD_QDSS_CLK] = &clk_smd_rpm_qdss_clk,
>>  	[RPM_SMD_QDSS_A_CLK] = &clk_smd_rpm_qdss_a_clk,
>>  	[RPM_SMD_PNOC_CLK] = &clk_smd_rpm_bus_0_pcnoc_clk,
>> -	[RPM_SMD_PNOC_A_CLK] = &clk_smd_rpm_bus_0_pcnoc_a_clk,
>> +	[RPM_SMD_PNOC_A_CLK] = &clk_smd_rpm_bus_0_pcnoc_a_keep_alive_clk,
>>  	[RPM_SMD_SNOC_CLK] = &clk_smd_rpm_bus_1_snoc_clk,
>>  	[RPM_SMD_SNOC_A_CLK] = &clk_smd_rpm_bus_1_snoc_a_clk,
>>  	[RPM_SMD_BIMC_CLK] = &clk_smd_rpm_bimc_clk,
>> @@ -948,7 +949,7 @@ static struct clk_smd_rpm *msm8998_clks[] = {
>>  	[RPM_SMD_BIMC_CLK] = &clk_smd_rpm_bimc_clk,
>>  	[RPM_SMD_BIMC_A_CLK] = &clk_smd_rpm_bimc_a_clk,
>>  	[RPM_SMD_PCNOC_CLK] = &clk_smd_rpm_bus_0_pcnoc_clk,
>> -	[RPM_SMD_PCNOC_A_CLK] = &clk_smd_rpm_bus_0_pcnoc_a_clk,
>> +	[RPM_SMD_PCNOC_A_CLK] = &clk_smd_rpm_bus_0_pcnoc_a_keep_alive_clk,
>>  	[RPM_SMD_SNOC_CLK] = &clk_smd_rpm_bus_1_snoc_clk,
>>  	[RPM_SMD_SNOC_A_CLK] = &clk_smd_rpm_bus_1_snoc_a_clk,
>>  	[RPM_SMD_CNOC_CLK] = &clk_smd_rpm_bus_2_cnoc_clk,
>> @@ -1010,7 +1011,7 @@ static struct clk_smd_rpm *sdm660_clks[] = {
>>  	[RPM_SMD_CNOC_CLK] = &clk_smd_rpm_bus_2_cnoc_clk,
>>  	[RPM_SMD_CNOC_A_CLK] = &clk_smd_rpm_bus_2_cnoc_a_clk,
>>  	[RPM_SMD_CNOC_PERIPH_CLK] = &clk_smd_rpm_bus_0_pcnoc_clk,
>> -	[RPM_SMD_CNOC_PERIPH_A_CLK] = &clk_smd_rpm_bus_0_pcnoc_a_clk,
>> +	[RPM_SMD_CNOC_PERIPH_A_CLK] = &clk_smd_rpm_bus_0_pcnoc_a_keep_alive_clk,
>>  	[RPM_SMD_BIMC_CLK] = &clk_smd_rpm_bimc_clk,
>>  	[RPM_SMD_BIMC_A_CLK] = &clk_smd_rpm_bimc_a_clk,
>>  	[RPM_SMD_MMSSNOC_AXI_CLK] = &clk_smd_rpm_mmssnoc_axi_rpm_clk,
>> @@ -1052,7 +1053,7 @@ static struct clk_smd_rpm *mdm9607_clks[] = {
>>  	[RPM_SMD_XO_CLK_SRC]		= &clk_smd_rpm_branch_bi_tcxo,
>>  	[RPM_SMD_XO_A_CLK_SRC]		= &clk_smd_rpm_branch_bi_tcxo_a,
>>  	[RPM_SMD_PCNOC_CLK]		= &clk_smd_rpm_bus_0_pcnoc_clk,
>> -	[RPM_SMD_PCNOC_A_CLK]		= &clk_smd_rpm_bus_0_pcnoc_a_clk,
>> +	[RPM_SMD_PCNOC_A_CLK]		= &clk_smd_rpm_bus_0_pcnoc_a_keep_alive_clk,
>>  	[RPM_SMD_BIMC_CLK]		= &clk_smd_rpm_bimc_clk,
>>  	[RPM_SMD_BIMC_A_CLK]		= &clk_smd_rpm_bimc_a_clk,
>>  	[RPM_SMD_QPIC_CLK]		= &clk_smd_rpm_qpic_clk,
>> @@ -1074,7 +1075,7 @@ static struct clk_smd_rpm *msm8953_clks[] = {
>>  	[RPM_SMD_XO_CLK_SRC]		= &clk_smd_rpm_branch_bi_tcxo,
>>  	[RPM_SMD_XO_A_CLK_SRC]		= &clk_smd_rpm_branch_bi_tcxo_a,
>>  	[RPM_SMD_PCNOC_CLK]		= &clk_smd_rpm_bus_0_pcnoc_clk,
>> -	[RPM_SMD_PCNOC_A_CLK]		= &clk_smd_rpm_bus_0_pcnoc_a_clk,
>> +	[RPM_SMD_PCNOC_A_CLK]		= &clk_smd_rpm_bus_0_pcnoc_a_keep_alive_clk,
>>  	[RPM_SMD_SNOC_CLK]		= &clk_smd_rpm_bus_1_snoc_clk,
>>  	[RPM_SMD_SNOC_A_CLK]		= &clk_smd_rpm_bus_1_snoc_a_clk,
>>  	[RPM_SMD_BIMC_CLK]		= &clk_smd_rpm_bimc_clk,
>>
>> -- 
>> 2.39.2
>>