Existing values were insufficient to produce accurate clock for audio
devices. New values are safe and most suitable to produce 48000Hz sample
rate.
Signed-off-by: Jan Dakinevich <[email protected]>
---
drivers/clk/meson/a1-pll.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/drivers/clk/meson/a1-pll.c b/drivers/clk/meson/a1-pll.c
index 4325e8a6a3ef..00e06d03445b 100644
--- a/drivers/clk/meson/a1-pll.c
+++ b/drivers/clk/meson/a1-pll.c
@@ -74,9 +74,9 @@ static struct clk_regmap fixed_pll = {
},
};
-static const struct pll_mult_range hifi_pll_mult_range = {
- .min = 32,
- .max = 64,
+static const struct pll_params_table hifi_pll_params_table[] = {
+ PLL_PARAMS(128, 5),
+ { },
};
static const struct reg_sequence hifi_init_regs[] = {
@@ -124,7 +124,7 @@ static struct clk_regmap hifi_pll = {
.shift = 6,
.width = 1,
},
- .range = &hifi_pll_mult_range,
+ .table = hifi_pll_params_table,
.init_regs = hifi_init_regs,
.init_count = ARRAY_SIZE(hifi_init_regs),
},
--
2.34.1
On Fri 15 Mar 2024 at 02:21, Jan Dakinevich <[email protected]> wrote:
> Existing values were insufficient to produce accurate clock for audio
> devices. New values are safe and most suitable to produce 48000Hz sample
> rate.
The hifi pll is not about 48k only. I see no reason to restrict the PLL
to a single setting.
You've provided no justification why the PLL driver can't reach the same
setting for 48k. The setting below is just the crude part. the fine
tuning is done done with the frac parameter so I doubt this provides a
more accurate rate.
>
> Signed-off-by: Jan Dakinevich <[email protected]>
> ---
> drivers/clk/meson/a1-pll.c | 8 ++++----
> 1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/clk/meson/a1-pll.c b/drivers/clk/meson/a1-pll.c
> index 4325e8a6a3ef..00e06d03445b 100644
> --- a/drivers/clk/meson/a1-pll.c
> +++ b/drivers/clk/meson/a1-pll.c
> @@ -74,9 +74,9 @@ static struct clk_regmap fixed_pll = {
> },
> };
>
> -static const struct pll_mult_range hifi_pll_mult_range = {
> - .min = 32,
> - .max = 64,
> +static const struct pll_params_table hifi_pll_params_table[] = {
> + PLL_PARAMS(128, 5),
> + { },
> };
>
> static const struct reg_sequence hifi_init_regs[] = {
> @@ -124,7 +124,7 @@ static struct clk_regmap hifi_pll = {
> .shift = 6,
> .width = 1,
> },
> - .range = &hifi_pll_mult_range,
> + .table = hifi_pll_params_table,
> .init_regs = hifi_init_regs,
> .init_count = ARRAY_SIZE(hifi_init_regs),
> },
--
Jerome
On 3/15/24 11:58, Jerome Brunet wrote:
>
> On Fri 15 Mar 2024 at 02:21, Jan Dakinevich <[email protected]> wrote:
>
>> Existing values were insufficient to produce accurate clock for audio
>> devices. New values are safe and most suitable to produce 48000Hz sample
>> rate.
>
> The hifi pll is not about 48k only. I see no reason to restrict the PLL
> to a single setting.
> > You've provided no justification why the PLL driver can't reach the same
> setting for 48k. The setting below is just the crude part. the fine
> tuning is done done with the frac parameter so I doubt this provides a
> more accurate rate.
>
You are right, it is not about 48k only. However, there are two issues.
First, indeed, I could just extend the range of multipliers to 1..255.
But I am unsure if hifi_pll is able to handle whole range of
mulptipliers. The value 128 is taken from Amlogic's branch, and I am
pretty sure that it works.
Second, unfortunately frac parameter currently doesn't work. When frac
is used enabling of hifi_pll fails in meson_clk_pll_wait_lock(). I see
it when try to use 44100Hz and multipliers' range is set to 1..255. So,
support of other rates than 48k requires extra effort.
>>
>> Signed-off-by: Jan Dakinevich <[email protected]>
>> ---
>> drivers/clk/meson/a1-pll.c | 8 ++++----
>> 1 file changed, 4 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/clk/meson/a1-pll.c b/drivers/clk/meson/a1-pll.c
>> index 4325e8a6a3ef..00e06d03445b 100644
>> --- a/drivers/clk/meson/a1-pll.c
>> +++ b/drivers/clk/meson/a1-pll.c
>> @@ -74,9 +74,9 @@ static struct clk_regmap fixed_pll = {
>> },
>> };
>>
>> -static const struct pll_mult_range hifi_pll_mult_range = {
>> - .min = 32,
>> - .max = 64,
>> +static const struct pll_params_table hifi_pll_params_table[] = {
>> + PLL_PARAMS(128, 5),
>> + { },
>> };
>>
>> static const struct reg_sequence hifi_init_regs[] = {
>> @@ -124,7 +124,7 @@ static struct clk_regmap hifi_pll = {
>> .shift = 6,
>> .width = 1,
>> },
>> - .range = &hifi_pll_mult_range,
>> + .table = hifi_pll_params_table,
>> .init_regs = hifi_init_regs,
>> .init_count = ARRAY_SIZE(hifi_init_regs),
>> },
>
>
--
Best regards
Jan Dakinevich
On Sun 17 Mar 2024 at 17:17, Jan Dakinevich <[email protected]> wrote:
> On 3/15/24 11:58, Jerome Brunet wrote:
>>
>> On Fri 15 Mar 2024 at 02:21, Jan Dakinevich <[email protected]> wrote:
>>
>>> Existing values were insufficient to produce accurate clock for audio
>>> devices. New values are safe and most suitable to produce 48000Hz sample
>>> rate.
>>
>> The hifi pll is not about 48k only. I see no reason to restrict the PLL
>> to a single setting.
>> > You've provided no justification why the PLL driver can't reach the same
>> setting for 48k. The setting below is just the crude part. the fine
>> tuning is done done with the frac parameter so I doubt this provides a
>> more accurate rate.
>>
>
> You are right, it is not about 48k only. However, there are two issues.
>
> First, indeed, I could just extend the range of multipliers to 1..255.
Why 1..255 ? This is not what I'm pointing out
According to the datasheet - the range is 32 - 64, as currently
set in the driver.
The change you have provided request a multipler of 128/5 = 25,6
If you put assigned-rate = 614400000 in DT, I see no reason can find the
same solution on its own.
> But I am unsure if hifi_pll is able to handle whole range of
> mulptipliers. The value 128 is taken from Amlogic's branch, and I am
> pretty sure that it works.
>
> Second, unfortunately frac parameter currently doesn't work. When frac
> is used enabling of hifi_pll fails in meson_clk_pll_wait_lock(). I see
> it when try to use 44100Hz and multipliers' range is set to 1..255. So,
> support of other rates than 48k requires extra effort.
Then your change is even more problematic because it certainly does not
disable frac ... which you say is broken.
That parameter should be removed with a proper comment explaining why
you are disabling it. That type a limitation / known issue should be
mentionned in your change.
>
>>>
>>> Signed-off-by: Jan Dakinevich <[email protected]>
>>> ---
>>> drivers/clk/meson/a1-pll.c | 8 ++++----
>>> 1 file changed, 4 insertions(+), 4 deletions(-)
>>>
>>> diff --git a/drivers/clk/meson/a1-pll.c b/drivers/clk/meson/a1-pll.c
>>> index 4325e8a6a3ef..00e06d03445b 100644
>>> --- a/drivers/clk/meson/a1-pll.c
>>> +++ b/drivers/clk/meson/a1-pll.c
>>> @@ -74,9 +74,9 @@ static struct clk_regmap fixed_pll = {
>>> },
>>> };
>>>
>>> -static const struct pll_mult_range hifi_pll_mult_range = {
>>> - .min = 32,
>>> - .max = 64,
>>> +static const struct pll_params_table hifi_pll_params_table[] = {
>>> + PLL_PARAMS(128, 5),
>>> + { },
>>> };
>>>
>>> static const struct reg_sequence hifi_init_regs[] = {
>>> @@ -124,7 +124,7 @@ static struct clk_regmap hifi_pll = {
>>> .shift = 6,
>>> .width = 1,
>>> },
>>> - .range = &hifi_pll_mult_range,
>>> + .table = hifi_pll_params_table,
>>> .init_regs = hifi_init_regs,
>>> .init_count = ARRAY_SIZE(hifi_init_regs),
>>> },
>>
>>
--
Jerome
On 3/18/24 13:17, Jerome Brunet wrote:
>
> On Sun 17 Mar 2024 at 17:17, Jan Dakinevich <[email protected]> wrote:
>
>> On 3/15/24 11:58, Jerome Brunet wrote:
>>>
>>> On Fri 15 Mar 2024 at 02:21, Jan Dakinevich <[email protected]> wrote:
>>>
>>>> Existing values were insufficient to produce accurate clock for audio
>>>> devices. New values are safe and most suitable to produce 48000Hz sample
>>>> rate.
>>>
>>> The hifi pll is not about 48k only. I see no reason to restrict the PLL
>>> to a single setting.
>>>> You've provided no justification why the PLL driver can't reach the same
>>> setting for 48k. The setting below is just the crude part. the fine
>>> tuning is done done with the frac parameter so I doubt this provides a
>>> more accurate rate.
>>>
>>
>> You are right, it is not about 48k only. However, there are two issues.
>>
>> First, indeed, I could just extend the range of multipliers to 1..255.
>
> Why 1..255 ? This is not what I'm pointing out
>
> According to the datasheet - the range is 32 - 64, as currently
> set in the driver.
>
Could you point where in the doc the range 32..64 is documented?
Documentation that I have may be not so complete, but I don't see there
any mention about it.
Anyway, range 32..64 of multipliers is not enough to produce accurate
clock, and a need 128 for 48kHz.
> The change you have provided request a multipler of 128/5 = 25,6
> If you put assigned-rate = 614400000 in DT, I see no reason can find the
> same solution on its own.
>
The reasoning is following. I don't know why 32..64 range was declared
for this clock, and whether it would be safe to extend it and include
128, which is required for 48kHz. But I know, that multiplier=128 is
safe and works fine (together divider=5).
>> But I am unsure if hifi_pll is able to handle whole range of
>> mulptipliers. The value 128 is taken from Amlogic's branch, and I am
>> pretty sure that it works.
>
>>
>> Second, unfortunately frac parameter currently doesn't work. When frac
>> is used enabling of hifi_pll fails in meson_clk_pll_wait_lock(). I see
>> it when try to use 44100Hz and multipliers' range is set to 1..255. So,
>> support of other rates than 48k requires extra effort.
>
> Then your change is even more problematic because it certainly does not
> disable frac ... which you say is broken.
>
> That parameter should be removed with a proper comment explaining why
> you are disabling it. That type a limitation / known issue should be
> mentionned in your change.
>
Handling of frac should not be removed, it should be fixed to achieve
another rates. But that is not the goal of this commit.
>>
>>>>
>>>> Signed-off-by: Jan Dakinevich <[email protected]>
>>>> ---
>>>> drivers/clk/meson/a1-pll.c | 8 ++++----
>>>> 1 file changed, 4 insertions(+), 4 deletions(-)
>>>>
>>>> diff --git a/drivers/clk/meson/a1-pll.c b/drivers/clk/meson/a1-pll.c
>>>> index 4325e8a6a3ef..00e06d03445b 100644
>>>> --- a/drivers/clk/meson/a1-pll.c
>>>> +++ b/drivers/clk/meson/a1-pll.c
>>>> @@ -74,9 +74,9 @@ static struct clk_regmap fixed_pll = {
>>>> },
>>>> };
>>>>
>>>> -static const struct pll_mult_range hifi_pll_mult_range = {
>>>> - .min = 32,
>>>> - .max = 64,
>>>> +static const struct pll_params_table hifi_pll_params_table[] = {
>>>> + PLL_PARAMS(128, 5),
>>>> + { },
>>>> };
>>>>
>>>> static const struct reg_sequence hifi_init_regs[] = {
>>>> @@ -124,7 +124,7 @@ static struct clk_regmap hifi_pll = {
>>>> .shift = 6,
>>>> .width = 1,
>>>> },
>>>> - .range = &hifi_pll_mult_range,
>>>> + .table = hifi_pll_params_table,
>>>> .init_regs = hifi_init_regs,
>>>> .init_count = ARRAY_SIZE(hifi_init_regs),
>>>> },
>>>
>>>
>
>
--
Best regards
Jan Dakinevich
On Tue 19 Mar 2024 at 01:35, Jan Dakinevich <[email protected]> wrote:
> On 3/18/24 13:17, Jerome Brunet wrote:
>>
>> On Sun 17 Mar 2024 at 17:17, Jan Dakinevich <[email protected]> wrote:
>>
>>> On 3/15/24 11:58, Jerome Brunet wrote:
>>>>
>>>> On Fri 15 Mar 2024 at 02:21, Jan Dakinevich <[email protected]> wrote:
>>>>
>>>>> Existing values were insufficient to produce accurate clock for audio
>>>>> devices. New values are safe and most suitable to produce 48000Hz sample
>>>>> rate.
>>>>
>>>> The hifi pll is not about 48k only. I see no reason to restrict the PLL
>>>> to a single setting.
>>>>> You've provided no justification why the PLL driver can't reach the same
>>>> setting for 48k. The setting below is just the crude part. the fine
>>>> tuning is done done with the frac parameter so I doubt this provides a
>>>> more accurate rate.
>>>>
>>>
>>> You are right, it is not about 48k only. However, there are two issues.
>>>
>>> First, indeed, I could just extend the range of multipliers to 1..255.
>>
>> Why 1..255 ? This is not what I'm pointing out
>>
>> According to the datasheet - the range is 32 - 64, as currently
>> set in the driver.
>>
>
> Could you point where in the doc the range 32..64 is documented?
> Documentation that I have may be not so complete, but I don't see there
> any mention about it.
>
> Anyway, range 32..64 of multipliers is not enough to produce accurate
> clock, and a need 128 for 48kHz.
A1 datasheet v0.4 - Section 7.6.3.2
>
>> The change you have provided request a multipler of 128/5 = 25,6
>> If you put assigned-rate = 614400000 in DT, I see no reason can find the
>> same solution on its own.
>>
>
> The reasoning is following. I don't know why 32..64 range was declared
> for this clock, and whether it would be safe to extend it and include
> 128, which is required for 48kHz. But I know, that multiplier=128 is
> safe and works fine (together divider=5).
You have not answer my remark.
Mainline does not do everything like the AML SDK does. Saying you are
copying it because you know it works (in your opinion) is not good
enough.
I'm telling you that your hack is not necessary and so far, you have not
demonstrated that it is.
Also the multiplier range in m/n, not m alone.
>
>>> But I am unsure if hifi_pll is able to handle whole range of
>>> mulptipliers. The value 128 is taken from Amlogic's branch, and I am
>>> pretty sure that it works.
>>
>>>
>>> Second, unfortunately frac parameter currently doesn't work. When frac
>>> is used enabling of hifi_pll fails in meson_clk_pll_wait_lock(). I see
>>> it when try to use 44100Hz and multipliers' range is set to 1..255. So,
>>> support of other rates than 48k requires extra effort.
>>
>> Then your change is even more problematic because it certainly does not
>> disable frac ... which you say is broken.
>>
>> That parameter should be removed with a proper comment explaining why
>> you are disabling it. That type a limitation / known issue should be
>> mentionned in your change.
>>
>
> Handling of frac should not be removed, it should be fixed to achieve
> another rates. But that is not the goal of this commit.
You argued that frac was broken and that was partly why you introduced
this work around. I'm telling you this approach is incorrect.
So either :
* Remove frac for now, until it is fixed, because it is broken and add
comment clearly explaining that quirk.
* Or fix it now.
Your choice.
>
>
>>>
>>>>>
>>>>> Signed-off-by: Jan Dakinevich <[email protected]>
>>>>> ---
>>>>> drivers/clk/meson/a1-pll.c | 8 ++++----
>>>>> 1 file changed, 4 insertions(+), 4 deletions(-)
>>>>>
>>>>> diff --git a/drivers/clk/meson/a1-pll.c b/drivers/clk/meson/a1-pll.c
>>>>> index 4325e8a6a3ef..00e06d03445b 100644
>>>>> --- a/drivers/clk/meson/a1-pll.c
>>>>> +++ b/drivers/clk/meson/a1-pll.c
>>>>> @@ -74,9 +74,9 @@ static struct clk_regmap fixed_pll = {
>>>>> },
>>>>> };
>>>>>
>>>>> -static const struct pll_mult_range hifi_pll_mult_range = {
>>>>> - .min = 32,
>>>>> - .max = 64,
>>>>> +static const struct pll_params_table hifi_pll_params_table[] = {
>>>>> + PLL_PARAMS(128, 5),
>>>>> + { },
>>>>> };
>>>>>
>>>>> static const struct reg_sequence hifi_init_regs[] = {
>>>>> @@ -124,7 +124,7 @@ static struct clk_regmap hifi_pll = {
>>>>> .shift = 6,
>>>>> .width = 1,
>>>>> },
>>>>> - .range = &hifi_pll_mult_range,
>>>>> + .table = hifi_pll_params_table,
>>>>> .init_regs = hifi_init_regs,
>>>>> .init_count = ARRAY_SIZE(hifi_init_regs),
>>>>> },
>>>>
>>>>
>>
>>
--
Jerome
On Tue, Mar 19, 2024 at 09:21:27AM +0100, Jerome Brunet wrote:
>
> On Tue 19 Mar 2024 at 01:35, Jan Dakinevich <[email protected]> wrote:
>
> > On 3/18/24 13:17, Jerome Brunet wrote:
> >>
> >> On Sun 17 Mar 2024 at 17:17, Jan Dakinevich <[email protected]> wrote:
> >>
> >>> On 3/15/24 11:58, Jerome Brunet wrote:
> >>>>
> >>>> On Fri 15 Mar 2024 at 02:21, Jan Dakinevich <[email protected]> wrote:
> >>>>
> >>>>> Existing values were insufficient to produce accurate clock for audio
> >>>>> devices. New values are safe and most suitable to produce 48000Hz sample
> >>>>> rate.
> >>>>
> >>>> The hifi pll is not about 48k only. I see no reason to restrict the PLL
> >>>> to a single setting.
> >>>>> You've provided no justification why the PLL driver can't reach the same
> >>>> setting for 48k. The setting below is just the crude part. the fine
> >>>> tuning is done done with the frac parameter so I doubt this provides a
> >>>> more accurate rate.
> >>>>
> >>>
> >>> You are right, it is not about 48k only. However, there are two issues.
> >>>
> >>> First, indeed, I could just extend the range of multipliers to 1..255.
> >>
> >> Why 1..255 ? This is not what I'm pointing out
> >>
> >> According to the datasheet - the range is 32 - 64, as currently
> >> set in the driver.
> >>
> >
> > Could you point where in the doc the range 32..64 is documented?
> > Documentation that I have may be not so complete, but I don't see there
> > any mention about it.
> >
> > Anyway, range 32..64 of multipliers is not enough to produce accurate
> > clock, and a need 128 for 48kHz.
>
> A1 datasheet v0.4 - Section 7.6.3.2
>
> >
> >> The change you have provided request a multipler of 128/5 = 25,6
> >> If you put assigned-rate = 614400000 in DT, I see no reason can find the
> >> same solution on its own.
> >>
> >
> > The reasoning is following. I don't know why 32..64 range was declared
> > for this clock, and whether it would be safe to extend it and include
> > 128, which is required for 48kHz. But I know, that multiplier=128 is
> > safe and works fine (together divider=5).
>
> You have not answer my remark.
> Mainline does not do everything like the AML SDK does. Saying you are
> copying it because you know it works (in your opinion) is not good
> enough.
>
> I'm telling you that your hack is not necessary and so far, you have not
> demonstrated that it is.
>
> Also the multiplier range in m/n, not m alone.
>
> >
> >>> But I am unsure if hifi_pll is able to handle whole range of
> >>> mulptipliers. The value 128 is taken from Amlogic's branch, and I am
> >>> pretty sure that it works.
> >>
> >>>
> >>> Second, unfortunately frac parameter currently doesn't work. When frac
> >>> is used enabling of hifi_pll fails in meson_clk_pll_wait_lock(). I see
> >>> it when try to use 44100Hz and multipliers' range is set to 1..255. So,
> >>> support of other rates than 48k requires extra effort.
> >>
> >> Then your change is even more problematic because it certainly does not
> >> disable frac ... which you say is broken.
> >>
> >> That parameter should be removed with a proper comment explaining why
> >> you are disabling it. That type a limitation / known issue should be
> >> mentionned in your change.
> >>
> >
> > Handling of frac should not be removed, it should be fixed to achieve
> > another rates. But that is not the goal of this commit.
>
> You argued that frac was broken and that was partly why you introduced
> this work around. I'm telling you this approach is incorrect.
>
> So either :
> * Remove frac for now, until it is fixed, because it is broken and add
> comment clearly explaining that quirk.
> * Or fix it now.
>
> Your choice.
>
> >
> >
> >>>
> >>>>>
> >>>>> Signed-off-by: Jan Dakinevich <[email protected]>
> >>>>> ---
> >>>>> drivers/clk/meson/a1-pll.c | 8 ++++----
> >>>>> 1 file changed, 4 insertions(+), 4 deletions(-)
> >>>>>
> >>>>> diff --git a/drivers/clk/meson/a1-pll.c b/drivers/clk/meson/a1-pll.c
> >>>>> index 4325e8a6a3ef..00e06d03445b 100644
> >>>>> --- a/drivers/clk/meson/a1-pll.c
> >>>>> +++ b/drivers/clk/meson/a1-pll.c
> >>>>> @@ -74,9 +74,9 @@ static struct clk_regmap fixed_pll = {
> >>>>> },
> >>>>> };
> >>>>>
> >>>>> -static const struct pll_mult_range hifi_pll_mult_range = {
> >>>>> - .min = 32,
> >>>>> - .max = 64,
> >>>>> +static const struct pll_params_table hifi_pll_params_table[] = {
> >>>>> + PLL_PARAMS(128, 5),
> >>>>> + { },
> >>>>> };
> >>>>>
> >>>>> static const struct reg_sequence hifi_init_regs[] = {
> >>>>> @@ -124,7 +124,7 @@ static struct clk_regmap hifi_pll = {
> >>>>> .shift = 6,
> >>>>> .width = 1,
> >>>>> },
> >>>>> - .range = &hifi_pll_mult_range,
> >>>>> + .table = hifi_pll_params_table,
> >>>>> .init_regs = hifi_init_regs,
> >>>>> .init_count = ARRAY_SIZE(hifi_init_regs),
> >>>>> },
> >>>>
> >>>>
> >>
> >>
>
>
> --
> Jerome
BTW, here Amlogic already mentioned all possible output audio rates for
which hifipll can be used:
https://lore.kernel.org/all/[email protected]/T/#md7083b4f851ab97dfce43f8f6a3b266eb49ed329
```
The audio working frequency are 44.1khz, 48khz and 192khz.
614.4M can meet the three frequency.
after the hifi pll, there are two dividers in Audio clock.
614.4M/3200 = 192khz
614.4M/12800 = 48khz
614,4M/13932 = 44.0999khz
```
--
Thank you,
Dmitry