linux-kernel - Re: [PATCH 2/6] clk: actions: Fix SD clocks factor table on Owl S500 SoC

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Date:   Wed, 26 May 2021 15:37:43 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     Cristian Ciocaltea <cristian.ciocaltea@...il.com>
Cc:     Stephen Boyd <sboyd@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Andreas Färber <afaerber@...e.de>,
        Michael Turquette <mturquette@...libre.com>,
        Edgar Bernardi Righi <edgar.righi@...tec.org.br>,
        linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-actions@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH 2/6] clk: actions: Fix SD clocks factor table on Owl S500
 SoC

On Tue, Mar 16, 2021 at 08:14:37PM +0200, Cristian Ciocaltea wrote:
> Hi Mani,
> 
> Thanks for reviewing this patch series!
> 
> On Tue, Mar 16, 2021 at 09:28:45AM +0530, Manivannan Sadhasivam wrote:
> > On Mon, Mar 08, 2021 at 07:18:27PM +0200, Cristian Ciocaltea wrote:
> > > Drop the unsupported entries in the factor table used for the SD[0-2]
> > > clocks definitions on the Actions Semi Owl S500 SoC.
> > > 
> > > Fixes: ed6b4795ece4 ("clk: actions: Add clock driver for S500 SoC")
> > > Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@...il.com>
> > > ---
> > >  drivers/clk/actions/owl-s500.c | 4 ----
> > >  1 file changed, 4 deletions(-)
> > > 
> > > diff --git a/drivers/clk/actions/owl-s500.c b/drivers/clk/actions/owl-s500.c
> > > index 75b7186185b0..69cd959205f5 100644
> > > --- a/drivers/clk/actions/owl-s500.c
> > > +++ b/drivers/clk/actions/owl-s500.c
> > > @@ -127,8 +127,6 @@ static struct clk_factor_table sd_factor_table[] = {
> > >  	{ 12, 1, 13 }, { 13, 1, 14 }, { 14, 1, 15 }, { 15, 1, 16 },
> > >  	{ 16, 1, 17 }, { 17, 1, 18 }, { 18, 1, 19 }, { 19, 1, 20 },
> > >  	{ 20, 1, 21 }, { 21, 1, 22 }, { 22, 1, 23 }, { 23, 1, 24 },
> > > -	{ 24, 1, 25 }, { 25, 1, 26 }, { 26, 1, 27 }, { 27, 1, 28 },
> > > -	{ 28, 1, 29 }, { 29, 1, 30 }, { 30, 1, 31 }, { 31, 1, 32 },
> > 

[...]

> This is basically what gets translated to sd_factor_table and I removed
> the extra entries 25..31. Actually I also dropped the 24th one, since
> that would give us an odd number of items, although I'm not quite sure
> this is a bug in the xapp-le code or the HW is really supposed to work
> like that.
> 

In my datasheet I can see the factor values till 24. So let's remove the
entries from 25-31.

Thanks,
Mani

> Kind regards,
> Cristi
> 
> > Thanks,
> > Mani
> > 
> > >  
> > >  	/* bit8: /128 */
> > >  	{ 256, 1, 1 * 128 }, { 257, 1, 2 * 128 }, { 258, 1, 3 * 128 }, { 259, 1, 4 * 128 },
> > > @@ -137,8 +135,6 @@ static struct clk_factor_table sd_factor_table[] = {
> > >  	{ 268, 1, 13 * 128 }, { 269, 1, 14 * 128 }, { 270, 1, 15 * 128 }, { 271, 1, 16 * 128 },
> > >  	{ 272, 1, 17 * 128 }, { 273, 1, 18 * 128 }, { 274, 1, 19 * 128 }, { 275, 1, 20 * 128 },
> > >  	{ 276, 1, 21 * 128 }, { 277, 1, 22 * 128 }, { 278, 1, 23 * 128 }, { 279, 1, 24 * 128 },
> > > -	{ 280, 1, 25 * 128 }, { 281, 1, 26 * 128 }, { 282, 1, 27 * 128 }, { 283, 1, 28 * 128 },
> > > -	{ 284, 1, 29 * 128 }, { 285, 1, 30 * 128 }, { 286, 1, 31 * 128 }, { 287, 1, 32 * 128 },
> > >  	{ 0, 0, 0 },
> > >  };
> > >  
> > > -- 
> > > 2.30.1
> > >