The GPU_CC block is powered by VDD_CX. Describe that.
Signed-off-by: Konrad Dybcio <[email protected]>
---
arch/arm64/boot/dts/qcom/sm6115.dtsi | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch/arm64/boot/dts/qcom/sm6115.dtsi b/arch/arm64/boot/dts/qcom/sm6115.dtsi
index 29b5b388cd94..bfaaa1801a4d 100644
--- a/arch/arm64/boot/dts/qcom/sm6115.dtsi
+++ b/arch/arm64/boot/dts/qcom/sm6115.dtsi
@@ -1430,6 +1430,8 @@ gpucc: clock-controller@5990000 {
clocks = <&rpmcc RPM_SMD_XO_CLK_SRC>,
<&gcc GCC_GPU_GPLL0_CLK_SRC>,
<&gcc GCC_GPU_GPLL0_DIV_CLK_SRC>;
+ power-domains = <&rpmpd SM6115_VDDCX>;
+ required-opps = <&rpmpd_opp_low_svs>;
#clock-cells = <1>;
#reset-cells = <1>;
#power-domain-cells = <1>;
--
2.41.0
On Mon, Jul 17, 2023 at 05:19:22PM +0200, Konrad Dybcio wrote:
> The GPU_CC block is powered by VDD_CX. Describe that.
>
> Signed-off-by: Konrad Dybcio <[email protected]>
> ---
> arch/arm64/boot/dts/qcom/sm6115.dtsi | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/qcom/sm6115.dtsi b/arch/arm64/boot/dts/qcom/sm6115.dtsi
> index 29b5b388cd94..bfaaa1801a4d 100644
> --- a/arch/arm64/boot/dts/qcom/sm6115.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sm6115.dtsi
> @@ -1430,6 +1430,8 @@ gpucc: clock-controller@5990000 {
> clocks = <&rpmcc RPM_SMD_XO_CLK_SRC>,
> <&gcc GCC_GPU_GPLL0_CLK_SRC>,
> <&gcc GCC_GPU_GPLL0_DIV_CLK_SRC>;
> + power-domains = <&rpmpd SM6115_VDDCX>;
> + required-opps = <&rpmpd_opp_low_svs>;
Where is this required-opp coming from? The clocks in gpucc seem to have
different voltage requirements depending on the rates, but we usually
handle that in the OPP tables of the consumer.
Thanks,
Stephan
On 17.07.2023 18:28, Stephan Gerhold wrote:
> On Mon, Jul 17, 2023 at 05:19:22PM +0200, Konrad Dybcio wrote:
>> The GPU_CC block is powered by VDD_CX. Describe that.
>>
>> Signed-off-by: Konrad Dybcio <[email protected]>
>> ---
>> arch/arm64/boot/dts/qcom/sm6115.dtsi | 2 ++
>> 1 file changed, 2 insertions(+)
>>
>> diff --git a/arch/arm64/boot/dts/qcom/sm6115.dtsi b/arch/arm64/boot/dts/qcom/sm6115.dtsi
>> index 29b5b388cd94..bfaaa1801a4d 100644
>> --- a/arch/arm64/boot/dts/qcom/sm6115.dtsi
>> +++ b/arch/arm64/boot/dts/qcom/sm6115.dtsi
>> @@ -1430,6 +1430,8 @@ gpucc: clock-controller@5990000 {
>> clocks = <&rpmcc RPM_SMD_XO_CLK_SRC>,
>> <&gcc GCC_GPU_GPLL0_CLK_SRC>,
>> <&gcc GCC_GPU_GPLL0_DIV_CLK_SRC>;
>> + power-domains = <&rpmpd SM6115_VDDCX>;
>> + required-opps = <&rpmpd_opp_low_svs>;
>
> Where is this required-opp coming from? The clocks in gpucc seem to have
> different voltage requirements depending on the rates, but we usually
> handle that in the OPP tables of the consumer.
The only lower levels defined for this SoC are VDD_MIN and VDD_RET,
but quite obviously the GPU won't work then
Konrad
>
> Thanks,
> Stephan
On Mon, Jul 17, 2023 at 06:50:18PM +0200, Konrad Dybcio wrote:
> On 17.07.2023 18:28, Stephan Gerhold wrote:
> > On Mon, Jul 17, 2023 at 05:19:22PM +0200, Konrad Dybcio wrote:
> >> The GPU_CC block is powered by VDD_CX. Describe that.
> >>
> >> Signed-off-by: Konrad Dybcio <[email protected]>
> >> ---
> >> arch/arm64/boot/dts/qcom/sm6115.dtsi | 2 ++
> >> 1 file changed, 2 insertions(+)
> >>
> >> diff --git a/arch/arm64/boot/dts/qcom/sm6115.dtsi b/arch/arm64/boot/dts/qcom/sm6115.dtsi
> >> index 29b5b388cd94..bfaaa1801a4d 100644
> >> --- a/arch/arm64/boot/dts/qcom/sm6115.dtsi
> >> +++ b/arch/arm64/boot/dts/qcom/sm6115.dtsi
> >> @@ -1430,6 +1430,8 @@ gpucc: clock-controller@5990000 {
> >> clocks = <&rpmcc RPM_SMD_XO_CLK_SRC>,
> >> <&gcc GCC_GPU_GPLL0_CLK_SRC>,
> >> <&gcc GCC_GPU_GPLL0_DIV_CLK_SRC>;
> >> + power-domains = <&rpmpd SM6115_VDDCX>;
> >> + required-opps = <&rpmpd_opp_low_svs>;
> >
> > Where is this required-opp coming from? The clocks in gpucc seem to have
> > different voltage requirements depending on the rates, but we usually
> > handle that in the OPP tables of the consumer.
> The only lower levels defined for this SoC are VDD_MIN and VDD_RET,
> but quite obviously the GPU won't work then
>
The levels needed for the GPU clocks to run should be in the GPU OPP
table though, just like e.g. sdhc2_opp_table for the SDCC clocks.
I still don't really understand why this is specified here. :)
Stephan
On Mon, Jul 17, 2023 at 07:11:33PM +0200, Konrad Dybcio wrote:
> On 17.07.2023 18:56, Stephan Gerhold wrote:
> > On Mon, Jul 17, 2023 at 06:50:18PM +0200, Konrad Dybcio wrote:
> >> On 17.07.2023 18:28, Stephan Gerhold wrote:
> >>> On Mon, Jul 17, 2023 at 05:19:22PM +0200, Konrad Dybcio wrote:
> >>>> The GPU_CC block is powered by VDD_CX. Describe that.
> >>>>
> >>>> Signed-off-by: Konrad Dybcio <[email protected]>
> >>>> ---
> >>>> arch/arm64/boot/dts/qcom/sm6115.dtsi | 2 ++
> >>>> 1 file changed, 2 insertions(+)
> >>>>
> >>>> diff --git a/arch/arm64/boot/dts/qcom/sm6115.dtsi b/arch/arm64/boot/dts/qcom/sm6115.dtsi
> >>>> index 29b5b388cd94..bfaaa1801a4d 100644
> >>>> --- a/arch/arm64/boot/dts/qcom/sm6115.dtsi
> >>>> +++ b/arch/arm64/boot/dts/qcom/sm6115.dtsi
> >>>> @@ -1430,6 +1430,8 @@ gpucc: clock-controller@5990000 {
> >>>> clocks = <&rpmcc RPM_SMD_XO_CLK_SRC>,
> >>>> <&gcc GCC_GPU_GPLL0_CLK_SRC>,
> >>>> <&gcc GCC_GPU_GPLL0_DIV_CLK_SRC>;
> >>>> + power-domains = <&rpmpd SM6115_VDDCX>;
> >>>> + required-opps = <&rpmpd_opp_low_svs>;
> >>>
> >>> Where is this required-opp coming from? The clocks in gpucc seem to have
> >>> different voltage requirements depending on the rates, but we usually
> >>> handle that in the OPP tables of the consumer.
> >> The only lower levels defined for this SoC are VDD_MIN and VDD_RET,
> >> but quite obviously the GPU won't work then
> >>
> >
> > The levels needed for the GPU clocks to run should be in the GPU OPP
> > table though, just like e.g. sdhc2_opp_table for the SDCC clocks.
> >
> > I still don't really understand why this is specified here. :)
> The GPU_CC block needs this rail to be at a certain power level for
> register access. This describes that requirement.
>
Can you show where this is defined downstream? On a quick look I didn't
see something like that anywhere. Or is this from some secret
documentation?
Thanks,
Stephan
On 17.07.2023 18:56, Stephan Gerhold wrote:
> On Mon, Jul 17, 2023 at 06:50:18PM +0200, Konrad Dybcio wrote:
>> On 17.07.2023 18:28, Stephan Gerhold wrote:
>>> On Mon, Jul 17, 2023 at 05:19:22PM +0200, Konrad Dybcio wrote:
>>>> The GPU_CC block is powered by VDD_CX. Describe that.
>>>>
>>>> Signed-off-by: Konrad Dybcio <[email protected]>
>>>> ---
>>>> arch/arm64/boot/dts/qcom/sm6115.dtsi | 2 ++
>>>> 1 file changed, 2 insertions(+)
>>>>
>>>> diff --git a/arch/arm64/boot/dts/qcom/sm6115.dtsi b/arch/arm64/boot/dts/qcom/sm6115.dtsi
>>>> index 29b5b388cd94..bfaaa1801a4d 100644
>>>> --- a/arch/arm64/boot/dts/qcom/sm6115.dtsi
>>>> +++ b/arch/arm64/boot/dts/qcom/sm6115.dtsi
>>>> @@ -1430,6 +1430,8 @@ gpucc: clock-controller@5990000 {
>>>> clocks = <&rpmcc RPM_SMD_XO_CLK_SRC>,
>>>> <&gcc GCC_GPU_GPLL0_CLK_SRC>,
>>>> <&gcc GCC_GPU_GPLL0_DIV_CLK_SRC>;
>>>> + power-domains = <&rpmpd SM6115_VDDCX>;
>>>> + required-opps = <&rpmpd_opp_low_svs>;
>>>
>>> Where is this required-opp coming from? The clocks in gpucc seem to have
>>> different voltage requirements depending on the rates, but we usually
>>> handle that in the OPP tables of the consumer.
>> The only lower levels defined for this SoC are VDD_MIN and VDD_RET,
>> but quite obviously the GPU won't work then
>>
>
> The levels needed for the GPU clocks to run should be in the GPU OPP
> table though, just like e.g. sdhc2_opp_table for the SDCC clocks.
>
> I still don't really understand why this is specified here. :)
The GPU_CC block needs this rail to be at a certain power level for
register access. This describes that requirement.
Konrad
On 17.07.2023 19:23, Stephan Gerhold wrote:
> On Mon, Jul 17, 2023 at 07:11:33PM +0200, Konrad Dybcio wrote:
>> On 17.07.2023 18:56, Stephan Gerhold wrote:
>>> On Mon, Jul 17, 2023 at 06:50:18PM +0200, Konrad Dybcio wrote:
>>>> On 17.07.2023 18:28, Stephan Gerhold wrote:
>>>>> On Mon, Jul 17, 2023 at 05:19:22PM +0200, Konrad Dybcio wrote:
>>>>>> The GPU_CC block is powered by VDD_CX. Describe that.
>>>>>>
>>>>>> Signed-off-by: Konrad Dybcio <[email protected]>
>>>>>> ---
>>>>>> arch/arm64/boot/dts/qcom/sm6115.dtsi | 2 ++
>>>>>> 1 file changed, 2 insertions(+)
>>>>>>
>>>>>> diff --git a/arch/arm64/boot/dts/qcom/sm6115.dtsi b/arch/arm64/boot/dts/qcom/sm6115.dtsi
>>>>>> index 29b5b388cd94..bfaaa1801a4d 100644
>>>>>> --- a/arch/arm64/boot/dts/qcom/sm6115.dtsi
>>>>>> +++ b/arch/arm64/boot/dts/qcom/sm6115.dtsi
>>>>>> @@ -1430,6 +1430,8 @@ gpucc: clock-controller@5990000 {
>>>>>> clocks = <&rpmcc RPM_SMD_XO_CLK_SRC>,
>>>>>> <&gcc GCC_GPU_GPLL0_CLK_SRC>,
>>>>>> <&gcc GCC_GPU_GPLL0_DIV_CLK_SRC>;
>>>>>> + power-domains = <&rpmpd SM6115_VDDCX>;
>>>>>> + required-opps = <&rpmpd_opp_low_svs>;
>>>>>
>>>>> Where is this required-opp coming from? The clocks in gpucc seem to have
>>>>> different voltage requirements depending on the rates, but we usually
>>>>> handle that in the OPP tables of the consumer.
>>>> The only lower levels defined for this SoC are VDD_MIN and VDD_RET,
>>>> but quite obviously the GPU won't work then
>>>>
>>>
>>> The levels needed for the GPU clocks to run should be in the GPU OPP
>>> table though, just like e.g. sdhc2_opp_table for the SDCC clocks.
>>>
>>> I still don't really understand why this is specified here. :)
>> The GPU_CC block needs this rail to be at a certain power level for
>> register access. This describes that requirement.
>>
>
> Can you show where this is defined downstream? On a quick look I didn't
> see something like that anywhere. Or is this from some secret
> documentation?
As far as downstream goes, you can notice that no branch's or RCG's
vdd tables ever define a level lower than the one I mentioned.
Konrad
On Mon, Jul 17, 2023 at 07:11:33PM +0200, Konrad Dybcio wrote:
> On 17.07.2023 18:56, Stephan Gerhold wrote:
> > On Mon, Jul 17, 2023 at 06:50:18PM +0200, Konrad Dybcio wrote:
> >> On 17.07.2023 18:28, Stephan Gerhold wrote:
> >>> On Mon, Jul 17, 2023 at 05:19:22PM +0200, Konrad Dybcio wrote:
> >>>> The GPU_CC block is powered by VDD_CX. Describe that.
> >>>>
> >>>> Signed-off-by: Konrad Dybcio <[email protected]>
> >>>> ---
> >>>> arch/arm64/boot/dts/qcom/sm6115.dtsi | 2 ++
> >>>> 1 file changed, 2 insertions(+)
> >>>>
> >>>> diff --git a/arch/arm64/boot/dts/qcom/sm6115.dtsi b/arch/arm64/boot/dts/qcom/sm6115.dtsi
> >>>> index 29b5b388cd94..bfaaa1801a4d 100644
> >>>> --- a/arch/arm64/boot/dts/qcom/sm6115.dtsi
> >>>> +++ b/arch/arm64/boot/dts/qcom/sm6115.dtsi
> >>>> @@ -1430,6 +1430,8 @@ gpucc: clock-controller@5990000 {
> >>>> clocks = <&rpmcc RPM_SMD_XO_CLK_SRC>,
> >>>> <&gcc GCC_GPU_GPLL0_CLK_SRC>,
> >>>> <&gcc GCC_GPU_GPLL0_DIV_CLK_SRC>;
> >>>> + power-domains = <&rpmpd SM6115_VDDCX>;
> >>>> + required-opps = <&rpmpd_opp_low_svs>;
> >>>
> >>> Where is this required-opp coming from? The clocks in gpucc seem to have
> >>> different voltage requirements depending on the rates, but we usually
> >>> handle that in the OPP tables of the consumer.
> >> The only lower levels defined for this SoC are VDD_MIN and VDD_RET,
> >> but quite obviously the GPU won't work then
> >>
> >
> > The levels needed for the GPU clocks to run should be in the GPU OPP
> > table though, just like e.g. sdhc2_opp_table for the SDCC clocks.
> >
> > I still don't really understand why this is specified here. :)
> The GPU_CC block needs this rail to be at a certain power level for
> register access. This describes that requirement.
>
And that is not the lowest level reported by command db?
Please describe this part in the commit message as well.
Thanks,
Bjorn
On Mon, Jul 17, 2023 at 09:18:21PM +0200, Konrad Dybcio wrote:
> On 17.07.2023 19:23, Stephan Gerhold wrote:
> > On Mon, Jul 17, 2023 at 07:11:33PM +0200, Konrad Dybcio wrote:
> >> On 17.07.2023 18:56, Stephan Gerhold wrote:
> >>> On Mon, Jul 17, 2023 at 06:50:18PM +0200, Konrad Dybcio wrote:
> >>>> On 17.07.2023 18:28, Stephan Gerhold wrote:
> >>>>> On Mon, Jul 17, 2023 at 05:19:22PM +0200, Konrad Dybcio wrote:
> >>>>>> The GPU_CC block is powered by VDD_CX. Describe that.
> >>>>>>
> >>>>>> Signed-off-by: Konrad Dybcio <[email protected]>
> >>>>>> ---
> >>>>>> arch/arm64/boot/dts/qcom/sm6115.dtsi | 2 ++
> >>>>>> 1 file changed, 2 insertions(+)
> >>>>>>
> >>>>>> diff --git a/arch/arm64/boot/dts/qcom/sm6115.dtsi b/arch/arm64/boot/dts/qcom/sm6115.dtsi
> >>>>>> index 29b5b388cd94..bfaaa1801a4d 100644
> >>>>>> --- a/arch/arm64/boot/dts/qcom/sm6115.dtsi
> >>>>>> +++ b/arch/arm64/boot/dts/qcom/sm6115.dtsi
> >>>>>> @@ -1430,6 +1430,8 @@ gpucc: clock-controller@5990000 {
> >>>>>> clocks = <&rpmcc RPM_SMD_XO_CLK_SRC>,
> >>>>>> <&gcc GCC_GPU_GPLL0_CLK_SRC>,
> >>>>>> <&gcc GCC_GPU_GPLL0_DIV_CLK_SRC>;
> >>>>>> + power-domains = <&rpmpd SM6115_VDDCX>;
> >>>>>> + required-opps = <&rpmpd_opp_low_svs>;
> >>>>>
> >>>>> Where is this required-opp coming from? The clocks in gpucc seem to have
> >>>>> different voltage requirements depending on the rates, but we usually
> >>>>> handle that in the OPP tables of the consumer.
> >>>> The only lower levels defined for this SoC are VDD_MIN and VDD_RET,
> >>>> but quite obviously the GPU won't work then
> >>>>
> >>>
> >>> The levels needed for the GPU clocks to run should be in the GPU OPP
> >>> table though, just like e.g. sdhc2_opp_table for the SDCC clocks.
> >>>
> >>> I still don't really understand why this is specified here. :)
> >> The GPU_CC block needs this rail to be at a certain power level for
> >> register access. This describes that requirement.
> >>
> >
> > Can you show where this is defined downstream? On a quick look I didn't
> > see something like that anywhere. Or is this from some secret
> > documentation?
> As far as downstream goes, you can notice that no branch's or RCG's
> vdd tables ever define a level lower than the one I mentioned.
>
As far as I can tell the vdd tables are only used when the clock is
actually enabled though, not for writing to registers while they are
disabled.
Stephan
On 18.07.2023 06:25, Bjorn Andersson wrote:
> On Mon, Jul 17, 2023 at 07:11:33PM +0200, Konrad Dybcio wrote:
>> On 17.07.2023 18:56, Stephan Gerhold wrote:
>>> On Mon, Jul 17, 2023 at 06:50:18PM +0200, Konrad Dybcio wrote:
>>>> On 17.07.2023 18:28, Stephan Gerhold wrote:
>>>>> On Mon, Jul 17, 2023 at 05:19:22PM +0200, Konrad Dybcio wrote:
>>>>>> The GPU_CC block is powered by VDD_CX. Describe that.
>>>>>>
>>>>>> Signed-off-by: Konrad Dybcio <[email protected]>
>>>>>> ---
>>>>>> arch/arm64/boot/dts/qcom/sm6115.dtsi | 2 ++
>>>>>> 1 file changed, 2 insertions(+)
>>>>>>
>>>>>> diff --git a/arch/arm64/boot/dts/qcom/sm6115.dtsi b/arch/arm64/boot/dts/qcom/sm6115.dtsi
>>>>>> index 29b5b388cd94..bfaaa1801a4d 100644
>>>>>> --- a/arch/arm64/boot/dts/qcom/sm6115.dtsi
>>>>>> +++ b/arch/arm64/boot/dts/qcom/sm6115.dtsi
>>>>>> @@ -1430,6 +1430,8 @@ gpucc: clock-controller@5990000 {
>>>>>> clocks = <&rpmcc RPM_SMD_XO_CLK_SRC>,
>>>>>> <&gcc GCC_GPU_GPLL0_CLK_SRC>,
>>>>>> <&gcc GCC_GPU_GPLL0_DIV_CLK_SRC>;
>>>>>> + power-domains = <&rpmpd SM6115_VDDCX>;
>>>>>> + required-opps = <&rpmpd_opp_low_svs>;
>>>>>
>>>>> Where is this required-opp coming from? The clocks in gpucc seem to have
>>>>> different voltage requirements depending on the rates, but we usually
>>>>> handle that in the OPP tables of the consumer.
>>>> The only lower levels defined for this SoC are VDD_MIN and VDD_RET,
>>>> but quite obviously the GPU won't work then
>>>>
>>>
>>> The levels needed for the GPU clocks to run should be in the GPU OPP
>>> table though, just like e.g. sdhc2_opp_table for the SDCC clocks.
>>>
>>> I still don't really understand why this is specified here. :)
>> The GPU_CC block needs this rail to be at a certain power level for
>> register access. This describes that requirement.
>>
>
> And that is not the lowest level reported by command db?
> Please describe this part in the commit message as well.
command-what? ;)
RPM exports VDD_NONE (off), VDD_MIN (the lowest state before collapse)
and then low_svs is usually the lowest "actually on" state for all
consumers.
Konrad
On 18.07.2023 13:56, Stephan Gerhold wrote:
> On Mon, Jul 17, 2023 at 09:18:21PM +0200, Konrad Dybcio wrote:
>> On 17.07.2023 19:23, Stephan Gerhold wrote:
>>> On Mon, Jul 17, 2023 at 07:11:33PM +0200, Konrad Dybcio wrote:
>>>> On 17.07.2023 18:56, Stephan Gerhold wrote:
>>>>> On Mon, Jul 17, 2023 at 06:50:18PM +0200, Konrad Dybcio wrote:
>>>>>> On 17.07.2023 18:28, Stephan Gerhold wrote:
>>>>>>> On Mon, Jul 17, 2023 at 05:19:22PM +0200, Konrad Dybcio wrote:
>>>>>>>> The GPU_CC block is powered by VDD_CX. Describe that.
>>>>>>>>
>>>>>>>> Signed-off-by: Konrad Dybcio <[email protected]>
>>>>>>>> ---
>>>>>>>> arch/arm64/boot/dts/qcom/sm6115.dtsi | 2 ++
>>>>>>>> 1 file changed, 2 insertions(+)
>>>>>>>>
>>>>>>>> diff --git a/arch/arm64/boot/dts/qcom/sm6115.dtsi b/arch/arm64/boot/dts/qcom/sm6115.dtsi
>>>>>>>> index 29b5b388cd94..bfaaa1801a4d 100644
>>>>>>>> --- a/arch/arm64/boot/dts/qcom/sm6115.dtsi
>>>>>>>> +++ b/arch/arm64/boot/dts/qcom/sm6115.dtsi
>>>>>>>> @@ -1430,6 +1430,8 @@ gpucc: clock-controller@5990000 {
>>>>>>>> clocks = <&rpmcc RPM_SMD_XO_CLK_SRC>,
>>>>>>>> <&gcc GCC_GPU_GPLL0_CLK_SRC>,
>>>>>>>> <&gcc GCC_GPU_GPLL0_DIV_CLK_SRC>;
>>>>>>>> + power-domains = <&rpmpd SM6115_VDDCX>;
>>>>>>>> + required-opps = <&rpmpd_opp_low_svs>;
>>>>>>>
>>>>>>> Where is this required-opp coming from? The clocks in gpucc seem to have
>>>>>>> different voltage requirements depending on the rates, but we usually
>>>>>>> handle that in the OPP tables of the consumer.
>>>>>> The only lower levels defined for this SoC are VDD_MIN and VDD_RET,
>>>>>> but quite obviously the GPU won't work then
>>>>>>
>>>>>
>>>>> The levels needed for the GPU clocks to run should be in the GPU OPP
>>>>> table though, just like e.g. sdhc2_opp_table for the SDCC clocks.
>>>>>
>>>>> I still don't really understand why this is specified here. :)
>>>> The GPU_CC block needs this rail to be at a certain power level for
>>>> register access. This describes that requirement.
>>>>
>>>
>>> Can you show where this is defined downstream? On a quick look I didn't
>>> see something like that anywhere. Or is this from some secret
>>> documentation?
>> As far as downstream goes, you can notice that no branch's or RCG's
>> vdd tables ever define a level lower than the one I mentioned.
>>
>
> As far as I can tell the vdd tables are only used when the clock is
> actually enabled though, not for writing to registers while they are
> disabled.
Maybe, but you can also notice that even XO rates require at least
SVS_LOW to function.
Konrad
On Tue, 18 Jul 2023 at 15:48, Konrad Dybcio <[email protected]> wrote:
>
> On 18.07.2023 13:56, Stephan Gerhold wrote:
> > On Mon, Jul 17, 2023 at 09:18:21PM +0200, Konrad Dybcio wrote:
> >> On 17.07.2023 19:23, Stephan Gerhold wrote:
> >>> On Mon, Jul 17, 2023 at 07:11:33PM +0200, Konrad Dybcio wrote:
> >>>> On 17.07.2023 18:56, Stephan Gerhold wrote:
> >>>>> On Mon, Jul 17, 2023 at 06:50:18PM +0200, Konrad Dybcio wrote:
> >>>>>> On 17.07.2023 18:28, Stephan Gerhold wrote:
> >>>>>>> On Mon, Jul 17, 2023 at 05:19:22PM +0200, Konrad Dybcio wrote:
> >>>>>>>> The GPU_CC block is powered by VDD_CX. Describe that.
> >>>>>>>>
> >>>>>>>> Signed-off-by: Konrad Dybcio <[email protected]>
> >>>>>>>> ---
> >>>>>>>> arch/arm64/boot/dts/qcom/sm6115.dtsi | 2 ++
> >>>>>>>> 1 file changed, 2 insertions(+)
> >>>>>>>>
> >>>>>>>> diff --git a/arch/arm64/boot/dts/qcom/sm6115.dtsi b/arch/arm64/boot/dts/qcom/sm6115.dtsi
> >>>>>>>> index 29b5b388cd94..bfaaa1801a4d 100644
> >>>>>>>> --- a/arch/arm64/boot/dts/qcom/sm6115.dtsi
> >>>>>>>> +++ b/arch/arm64/boot/dts/qcom/sm6115.dtsi
> >>>>>>>> @@ -1430,6 +1430,8 @@ gpucc: clock-controller@5990000 {
> >>>>>>>> clocks = <&rpmcc RPM_SMD_XO_CLK_SRC>,
> >>>>>>>> <&gcc GCC_GPU_GPLL0_CLK_SRC>,
> >>>>>>>> <&gcc GCC_GPU_GPLL0_DIV_CLK_SRC>;
> >>>>>>>> + power-domains = <&rpmpd SM6115_VDDCX>;
> >>>>>>>> + required-opps = <&rpmpd_opp_low_svs>;
> >>>>>>>
> >>>>>>> Where is this required-opp coming from? The clocks in gpucc seem to have
> >>>>>>> different voltage requirements depending on the rates, but we usually
> >>>>>>> handle that in the OPP tables of the consumer.
> >>>>>> The only lower levels defined for this SoC are VDD_MIN and VDD_RET,
> >>>>>> but quite obviously the GPU won't work then
> >>>>>>
> >>>>>
> >>>>> The levels needed for the GPU clocks to run should be in the GPU OPP
> >>>>> table though, just like e.g. sdhc2_opp_table for the SDCC clocks.
> >>>>>
> >>>>> I still don't really understand why this is specified here. :)
> >>>> The GPU_CC block needs this rail to be at a certain power level for
> >>>> register access. This describes that requirement.
> >>>>
> >>>
> >>> Can you show where this is defined downstream? On a quick look I didn't
> >>> see something like that anywhere. Or is this from some secret
> >>> documentation?
> >> As far as downstream goes, you can notice that no branch's or RCG's
> >> vdd tables ever define a level lower than the one I mentioned.
> >>
> >
> > As far as I can tell the vdd tables are only used when the clock is
> > actually enabled though, not for writing to registers while they are
> > disabled.
> Maybe, but you can also notice that even XO rates require at least
> SVS_LOW to function.
But the vdd tables are related to clock rates, which, in the upstream
design, should be voted by the consumers, not by the clock driver.
--
With best wishes
Dmitry
On 18.07.2023 15:08, Dmitry Baryshkov wrote:
> On Tue, 18 Jul 2023 at 15:48, Konrad Dybcio <[email protected]> wrote:
>>
>> On 18.07.2023 13:56, Stephan Gerhold wrote:
>>> On Mon, Jul 17, 2023 at 09:18:21PM +0200, Konrad Dybcio wrote:
>>>> On 17.07.2023 19:23, Stephan Gerhold wrote:
>>>>> On Mon, Jul 17, 2023 at 07:11:33PM +0200, Konrad Dybcio wrote:
>>>>>> On 17.07.2023 18:56, Stephan Gerhold wrote:
>>>>>>> On Mon, Jul 17, 2023 at 06:50:18PM +0200, Konrad Dybcio wrote:
>>>>>>>> On 17.07.2023 18:28, Stephan Gerhold wrote:
>>>>>>>>> On Mon, Jul 17, 2023 at 05:19:22PM +0200, Konrad Dybcio wrote:
>>>>>>>>>> The GPU_CC block is powered by VDD_CX. Describe that.
>>>>>>>>>>
>>>>>>>>>> Signed-off-by: Konrad Dybcio <[email protected]>
>>>>>>>>>> ---
>>>>>>>>>> arch/arm64/boot/dts/qcom/sm6115.dtsi | 2 ++
>>>>>>>>>> 1 file changed, 2 insertions(+)
>>>>>>>>>>
>>>>>>>>>> diff --git a/arch/arm64/boot/dts/qcom/sm6115.dtsi b/arch/arm64/boot/dts/qcom/sm6115.dtsi
>>>>>>>>>> index 29b5b388cd94..bfaaa1801a4d 100644
>>>>>>>>>> --- a/arch/arm64/boot/dts/qcom/sm6115.dtsi
>>>>>>>>>> +++ b/arch/arm64/boot/dts/qcom/sm6115.dtsi
>>>>>>>>>> @@ -1430,6 +1430,8 @@ gpucc: clock-controller@5990000 {
>>>>>>>>>> clocks = <&rpmcc RPM_SMD_XO_CLK_SRC>,
>>>>>>>>>> <&gcc GCC_GPU_GPLL0_CLK_SRC>,
>>>>>>>>>> <&gcc GCC_GPU_GPLL0_DIV_CLK_SRC>;
>>>>>>>>>> + power-domains = <&rpmpd SM6115_VDDCX>;
>>>>>>>>>> + required-opps = <&rpmpd_opp_low_svs>;
>>>>>>>>>
>>>>>>>>> Where is this required-opp coming from? The clocks in gpucc seem to have
>>>>>>>>> different voltage requirements depending on the rates, but we usually
>>>>>>>>> handle that in the OPP tables of the consumer.
>>>>>>>> The only lower levels defined for this SoC are VDD_MIN and VDD_RET,
>>>>>>>> but quite obviously the GPU won't work then
>>>>>>>>
>>>>>>>
>>>>>>> The levels needed for the GPU clocks to run should be in the GPU OPP
>>>>>>> table though, just like e.g. sdhc2_opp_table for the SDCC clocks.
>>>>>>>
>>>>>>> I still don't really understand why this is specified here. :)
>>>>>> The GPU_CC block needs this rail to be at a certain power level for
>>>>>> register access. This describes that requirement.
>>>>>>
>>>>>
>>>>> Can you show where this is defined downstream? On a quick look I didn't
>>>>> see something like that anywhere. Or is this from some secret
>>>>> documentation?
>>>> As far as downstream goes, you can notice that no branch's or RCG's
>>>> vdd tables ever define a level lower than the one I mentioned.
>>>>
>>>
>>> As far as I can tell the vdd tables are only used when the clock is
>>> actually enabled though, not for writing to registers while they are
>>> disabled.
>> Maybe, but you can also notice that even XO rates require at least
>> SVS_LOW to function.
>
> But the vdd tables are related to clock rates, which, in the upstream
> design, should be voted by the consumers, not by the clock driver.
Not all of the clocks are associated with OPP tables upstream, and it
would be nice if the clock controller block had power flowing to it
in case one wanted to access a different clock.
Konrad
On Tue, Jul 18, 2023 at 02:21:31PM +0200, Konrad Dybcio wrote:
> On 18.07.2023 06:25, Bjorn Andersson wrote:
> > On Mon, Jul 17, 2023 at 07:11:33PM +0200, Konrad Dybcio wrote:
> >> On 17.07.2023 18:56, Stephan Gerhold wrote:
> >>> On Mon, Jul 17, 2023 at 06:50:18PM +0200, Konrad Dybcio wrote:
> >>>> On 17.07.2023 18:28, Stephan Gerhold wrote:
> >>>>> On Mon, Jul 17, 2023 at 05:19:22PM +0200, Konrad Dybcio wrote:
> >>>>>> The GPU_CC block is powered by VDD_CX. Describe that.
> >>>>>>
> >>>>>> Signed-off-by: Konrad Dybcio <[email protected]>
> >>>>>> ---
> >>>>>> arch/arm64/boot/dts/qcom/sm6115.dtsi | 2 ++
> >>>>>> 1 file changed, 2 insertions(+)
> >>>>>>
> >>>>>> diff --git a/arch/arm64/boot/dts/qcom/sm6115.dtsi b/arch/arm64/boot/dts/qcom/sm6115.dtsi
> >>>>>> index 29b5b388cd94..bfaaa1801a4d 100644
> >>>>>> --- a/arch/arm64/boot/dts/qcom/sm6115.dtsi
> >>>>>> +++ b/arch/arm64/boot/dts/qcom/sm6115.dtsi
> >>>>>> @@ -1430,6 +1430,8 @@ gpucc: clock-controller@5990000 {
> >>>>>> clocks = <&rpmcc RPM_SMD_XO_CLK_SRC>,
> >>>>>> <&gcc GCC_GPU_GPLL0_CLK_SRC>,
> >>>>>> <&gcc GCC_GPU_GPLL0_DIV_CLK_SRC>;
> >>>>>> + power-domains = <&rpmpd SM6115_VDDCX>;
> >>>>>> + required-opps = <&rpmpd_opp_low_svs>;
> >>>>>
> >>>>> Where is this required-opp coming from? The clocks in gpucc seem to have
> >>>>> different voltage requirements depending on the rates, but we usually
> >>>>> handle that in the OPP tables of the consumer.
> >>>> The only lower levels defined for this SoC are VDD_MIN and VDD_RET,
> >>>> but quite obviously the GPU won't work then
> >>>>
> >>>
> >>> The levels needed for the GPU clocks to run should be in the GPU OPP
> >>> table though, just like e.g. sdhc2_opp_table for the SDCC clocks.
> >>>
> >>> I still don't really understand why this is specified here. :)
> >> The GPU_CC block needs this rail to be at a certain power level for
> >> register access. This describes that requirement.
> >>
> >
> > And that is not the lowest level reported by command db?
> > Please describe this part in the commit message as well.
> command-what? ;)
>
Apparently doesn't matter that I read that line multiple times, my brain
really wanted a 'h' in there.
> RPM exports VDD_NONE (off), VDD_MIN (the lowest state before collapse)
> and then low_svs is usually the lowest "actually on" state for all
> consumers.
>
In rpmhpd I changed it such that the minimal enabled state would be
!disabled (so that the automatic enablement during probe would be
sufficient to access registers), but talking to Ulf this is
provider-specific.
So unless you can figure out a acceptable lowest non-disabled state this
is what has to be done...
PS. My ask for mentioning this in the commit message still stands.
Regards,
Bjorn