linux-kernel - Re: [PATCH v6 1/2] clk: qcom: gcc-ipq6018: update sdcc max clock frequency

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Date: Wed, 26 Jun 2024 09:22:14 +0200
From: Robert Marko <robimarko@...il.com>
To: Bjorn Andersson <andersson@...nel.org>
Cc: Chukun Pan <amadeus@....edu.cn>, Konrad Dybcio <konrad.dybcio@...aro.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, linux-arm-msm@...r.kernel.org, 
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-clk@...r.kernel.org
Subject: Re: [PATCH v6 1/2] clk: qcom: gcc-ipq6018: update sdcc max clock frequency

On Wed, 26 Jun 2024 at 06:03, Bjorn Andersson <andersson@...nel.org> wrote:
>
> On Sat, Jun 22, 2024 at 04:36:20PM GMT, Robert Marko wrote:
> >
> > On 20. 06. 2024. 17:01, Chukun Pan wrote:
> > > The mmc controller of the IPQ6018 does not support HS400 mode.
> > > So adjust the maximum clock frequency of sdcc to 200 MHz (HS200).
> > >
> > > Signed-off-by: Chukun Pan <amadeus@....edu.cn>
> > > ---
> > >   drivers/clk/qcom/gcc-ipq6018.c | 2 +-
> > >   1 file changed, 1 insertion(+), 1 deletion(-)
> > >
> > > diff --git a/drivers/clk/qcom/gcc-ipq6018.c b/drivers/clk/qcom/gcc-ipq6018.c
> > > index 7e69de34c310..6c764e3e2665 100644
> > > --- a/drivers/clk/qcom/gcc-ipq6018.c
> > > +++ b/drivers/clk/qcom/gcc-ipq6018.c
> > > @@ -1617,7 +1617,7 @@ static const struct freq_tbl ftbl_sdcc_apps_clk_src[] = {
> > >     F(96000000, P_GPLL2, 12, 0, 0),
> > >     F(177777778, P_GPLL0, 4.5, 0, 0),
> > >     F(192000000, P_GPLL2, 6, 0, 0),
> > > -   F(384000000, P_GPLL2, 3, 0, 0),
> > > +   F(200000000, P_GPLL0, 4, 0, 0),
> >
> > Hi,
> > Are you sure that 200MHz is even valid of a frequency, cause all IPQ SoC-s
> > use 192MHz for the HS200 mode instead.
> >
>
> If I'm parsing the docs correctly, 192MHz, 200MHz and 384MHz are a valid
> frequencies for the clock output, but the SDCC expects to receive 200MHz.
>
> > I would just drop the 384MHz frequency as datasheet clearly states that
> > HS400
> > is not supported.
> >
>
> I'll pick this patch as suggested. Please don't hesitate to send a
> follow up patch according to this suggestion if it turns out to be a
> better choice.

Since you have datasheet and 200MHz is a valid option that is fine
by me.

Regards,
Robert
>
> Regards,
> Bjorn
>
> > Regards,
> > Robert
> >
> > >     { }
> > >   };