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From: Tomi Valkeinen <tomi.valkeinen@ti.com>
To: Adam Ford <aford173@gmail.com>,
	"H. Nikolaus Schaller" <hns@goldelico.com>
Cc: "Tero Kristo" <t-kristo@ti.com>,
	"Tony Lindgren" <tony@atomide.com>,
	Linux-OMAP <linux-omap@vger.kernel.org>,
	"Adam Ford" <adam.ford@logicpd.com>,
	"Benoît Cousson" <bcousson@baylibre.com>,
	dri-devel <dri-devel@lists.freedesktop.org>,
	devicetree <devicetree@vger.kernel.org>,
	"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] drm/omap: Migrate minimum FCK/PCK ratio from Kconfig to dts
Date: Mon, 30 Sep 2019 17:27:05 +0300	[thread overview]
Message-ID: <3777f1b1-2d9a-334b-b9e7-99dfda2ae29b@ti.com> (raw)
In-Reply-To: <04306a5e-f9be-35a4-1aa1-5795d780e289@ti.com>

On 30/09/2019 17:20, Tomi Valkeinen wrote:

> Let's see what Tero says, but yeah, something is odd here. I expected 
> the max divider to be 16 with Tero's patch, but I don't see it having 
> that effect. I can get the div to 31.
> 
> You can see this from the clock register 0x48004e40 (CM_CLKSEL_DSS). The 
> lowest bits are the divider, 5 to 0. The TRM says max div is 32.
> 
> Tero said for him the dividers > 16 didn't "stick" to the register. I'm 
> now wondering if he has an old beagleboard with OMAP34xx, which has max 
> div 16.

So testing a bit more here, I can see the DSS working fine and fps as 
expected when I write values directly to CM_CLKSEL_DSS:5:0, with 
dividers up to 31. With 32, DSS breaks. The TRM (AM/DM37x) says value 32 
is valid.

  Tomi

-- 
Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki

  reply	other threads:[~2019-09-30 14:27 UTC|newest]

Thread overview: 55+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-10 19:42 [PATCH] drm/omap: Migrate minimum FCK/PCK ratio from Kconfig to dts Adam Ford
2019-05-28 11:11 ` Tomi Valkeinen
2019-05-28 11:11   ` Tomi Valkeinen
2019-05-28 15:09   ` Adam Ford
2019-05-28 15:20     ` H. Nikolaus Schaller
2019-05-28 15:53     ` Tomi Valkeinen
2019-05-31 12:13       ` Adam Ford
2019-09-25 20:51       ` Adam Ford
2019-09-26  6:55         ` Tomi Valkeinen
2019-09-26  6:55           ` Tomi Valkeinen
2019-09-26 14:12           ` Adam Ford
2019-09-27  6:21             ` Tomi Valkeinen
2019-09-27  6:21               ` Tomi Valkeinen
2019-09-27 12:13               ` Adam Ford
2019-09-27 13:45                 ` Tomi Valkeinen
2019-09-27  7:55             ` Tomi Valkeinen
2019-09-27  7:55               ` Tomi Valkeinen
2019-09-27 12:33               ` Adam Ford
2019-09-27 13:47                 ` Tomi Valkeinen
2019-09-27 15:37                   ` Tero Kristo
2019-09-27 15:47                     ` Tomi Valkeinen
2019-09-27 15:47                       ` Tomi Valkeinen
2019-09-30  6:45                       ` Tomi Valkeinen
2019-09-30  6:45                         ` Tomi Valkeinen
2019-09-30  8:53                         ` Tero Kristo
2019-09-30  8:53                           ` Tero Kristo
2019-09-30 12:41                           ` Adam Ford
2019-09-30 12:41                             ` Adam Ford
2019-09-30 12:47                             ` Tero Kristo
2019-09-30 13:17                               ` Adam Ford
2019-09-30 13:35                                 ` Tomi Valkeinen
2019-09-30 13:38                           ` H. Nikolaus Schaller
2019-09-30 13:54                             ` Adam Ford
2019-09-30 14:04                               ` Adam Ford
2019-09-30 14:12                                 ` Adam Ford
2019-09-30 14:12                                   ` Adam Ford
2019-09-30 14:20                                   ` Tomi Valkeinen
2019-09-30 14:20                                     ` Tomi Valkeinen
2019-09-30 14:27                                     ` Tomi Valkeinen [this message]
2019-09-30 14:56                                       ` H. Nikolaus Schaller
2019-09-30 14:56                                         ` H. Nikolaus Schaller
2019-09-30 15:10                                       ` Adam Ford
2019-09-30 17:48                                         ` Tero Kristo
2019-10-01  5:07                                           ` Tomi Valkeinen
2019-10-01  5:12                                             ` Tero Kristo
2019-10-01  8:12                                             ` Tero Kristo
2019-10-01  8:12                                               ` Tero Kristo
2019-10-01  9:31                                               ` Tomi Valkeinen
2019-10-01  9:31                                                 ` Tomi Valkeinen
2019-10-01 13:06                                                 ` Adam Ford
2019-10-01 13:06                                                   ` Adam Ford
2019-10-01 13:14                                                   ` Tomi Valkeinen
2019-09-25 21:26   ` Andrew F. Davis
2019-09-25 21:26     ` Andrew F. Davis
2019-06-13 20:22 ` Rob Herring

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