From: Tomi Valkeinen <tomi.valkeinen@ti.com>
To: Tero Kristo <t-kristo@ti.com>, Adam Ford <aford173@gmail.com>
Cc: "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: Fri, 27 Sep 2019 18:47:54 +0300 [thread overview]
Message-ID: <eb2eb1f6-3c9b-7ecb-667e-819033af9c14@ti.com> (raw)
In-Reply-To: <36369388-e9c8-22cd-8c19-e2bdf2d0389b@ti.com>
On 27/09/2019 18:37, Tero Kristo wrote:
> If you can provide details about what clock framework / driver does
> wrong (sample clk_set_xyz call sequence, expected results via
> clk_get_xyz, and what fails), I can take a look at it. Just reporting
> arbitrary display driver issues I won't be able to debug at all (I don't
> have access to any of the displays, nor do I want to waste time
> debugging them without absolutely no knowledge whatsoever.)
I used your hack patches to allow changing rates via debugfs. And set
dss1_alwon_fck_3430es2 to 27000000 or 27870967. The end result was that
DSS gets some very high clock from dss1_alwon_fck_3430es2, as the frame
rate jumps to many hundreds fps.
So, these numbers are not real, but to give the idea what I saw. Running
first with 50 MHz, I can see, say, 40 fps. Then I set the clock to 30
MHz, and fps dropped to, say, 30fps, as expected with lower clock. Then
I set the clock to 27MHz (or the other one), expecting a bit lower fps,
but instead I saw hundreds of fps.
I don't know if there's any other way to observe the wrong clock rate
but have the dss enabled and running kmstest or similar. I can help you
set that up next week, should be trivial. You don't need a display for that.
Tomi
--
Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki
next prev parent reply other threads:[~2019-09-27 15:48 UTC|newest]
Thread overview: 40+ 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 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 14:12 ` Adam Ford
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 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 [this message]
2019-09-30 6:45 ` Tomi Valkeinen
2019-09-30 8:53 ` Tero Kristo
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 14:20 ` Tomi Valkeinen
2019-09-30 14:27 ` Tomi Valkeinen
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 9:31 ` Tomi Valkeinen
2019-10-01 13:06 ` Adam Ford
2019-10-01 13:14 ` Tomi Valkeinen
2019-09-25 21:26 ` Andrew F. Davis
2019-06-13 20:22 ` Rob Herring
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