linux-kernel - Re: [PATCH] drm/omap: Migrate minimum FCK/PCK ratio from Kconfig to dts

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Date:   Tue, 1 Oct 2019 11:12:10 +0300
From:   Tero Kristo <t-kristo@...com>
To:     Tomi Valkeinen <tomi.valkeinen@...com>,
        Adam Ford <aford173@...il.com>
CC:     "H. Nikolaus Schaller" <hns@...delico.com>,
        Tony Lindgren <tony@...mide.com>,
        Linux-OMAP <linux-omap@...r.kernel.org>,
        Adam Ford <adam.ford@...icpd.com>,
        Benoît Cousson <bcousson@...libre.com>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        devicetree <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/omap: Migrate minimum FCK/PCK ratio from Kconfig to
 dts

On 01/10/2019 08:07, Tomi Valkeinen wrote:
> On 30/09/2019 20:48, Tero Kristo wrote:
> 
>> Hmmh, after some testing, it seems there is bad stuff happening with 
>> the divider clock implementation, I am re-working it as of now. 
>> Basically what is wrong is that with a divider max value of say 16, 
>> the driver attempts to craft the max value into a mask, but this ends 
>> up being 0x1f. If the max value is 15, it ends up into 0xf which is 
>> correct.
> 
> Ok, that explains the max not working.
> 
> It doesn't explain the other issue, where the TRM says the max div is 
> 32, but it does not work. But taking the max div from the old SoCs, 16, 
> is not correct either, as it seems that dividers up to 31 work ok.
> 
>   Tomi
> 

Ok, attached a series that hopefully fixes it, any testing feedback 
welcome before I post this properly.

This also supports omap36xx dpll4_m4_ck divider up-to 31, other omap3 
family is limited to 16.

-Tero


--
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View attachment "0002-clk-ti-divider-cleanup-ti_clk_parse_divider_data-API.patch" of type "text/x-patch" (3104 bytes)

View attachment "0003-clk-ti-divider-convert-to-use-min-max-mask-instead-o.patch" of type "text/x-patch" (8401 bytes)

View attachment "0004-ARM-dts-omap3-fix-DPLL4-M4-divider-max-value.patch" of type "text/x-patch" (1542 bytes)

View attachment "0001-clk-ti-divider-cleanup-_register_divider-and-ti_clk_.patch" of type "text/x-patch" (6839 bytes)