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

From: Cristian Ciocaltea <cristian.ciocaltea@gmail.com>
To: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Cc: "Stephen Boyd" <sboyd@kernel.org>,
	"Rob Herring" <robh+dt@kernel.org>,
	"Andreas Färber" <afaerber@suse.de>,
	"Michael Turquette" <mturquette@baylibre.com>,
	"Edgar Bernardi Righi" <edgar.righi@lsitec.org.br>,
	linux-clk@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-actions@lists.infradead.org, linux-kernel@vger.kernel.org,
	devicetree@vger.kernel.org
Subject: Re: [PATCH 2/6] clk: actions: Fix SD clocks factor table on Owl S500 SoC
Date: Thu, 27 May 2021 16:27:33 +0300	[thread overview]
Message-ID: <20210527132733.GA1300160@BV030612LT> (raw)
In-Reply-To: <20210526100719.GC10723@work>

On Wed, May 26, 2021 at 03:37:43PM +0530, Manivannan Sadhasivam wrote:
> 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@gmail.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.

I got an updated datasheet and I confirm 24 is a valid selector. Applied
the correction in v2:

https://lore.kernel.org/lkml/cover.1622119892.git.cristian.ciocaltea@gmail.com/

Thanks,
Cristi

> 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
> > > > 