From: "H. Nikolaus Schaller" <hns@goldelico.com>
To: Andreas Kemnade <andreas@kemnade.info>
Cc: Sven Van Asbroeck <thesven73@gmail.com>,
Discussions about the Letux Kernel
<letux-kernel@openphoenux.org>,
Linus Walleij <linus.walleij@linaro.org>,
Mark Brown <broonie@kernel.org>,
kernel list <linux-kernel@vger.kernel.org>,
Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Subject: Re: [Letux-kernel] [BUG] SPI broken for SPI based panel drivers
Date: Tue, 1 Dec 2020 17:51:12 +0100 [thread overview]
Message-ID: <BEB2D564-489D-4761-8B98-DB90E0A42B60@goldelico.com> (raw)
In-Reply-To: <20201201174433.2000c8a3@aktux>
> Am 01.12.2020 um 17:44 schrieb Andreas Kemnade <andreas@kemnade.info>:
>
> On Tue, 1 Dec 2020 11:10:49 -0500
> Sven Van Asbroeck <thesven73@gmail.com> wrote:
>
>> Nikolaus,
>>
>> On Tue, Dec 1, 2020 at 9:38 AM H. Nikolaus Schaller <hns@goldelico.com> wrote:
>>>
>>> Let's work on a fix for the fix now.
>>>
>>
>> Are you quite sure the chip-select of the tpo,td028ttec1 panel
>> is active-high? A quick google produced a datasheet which
>> seems to indicate that XCS is active-low?
>>
> Schematics is here:
> https://projects.goldelico.com/p/gta04-main/downloads/48/
>
> The display connector P204-LCD indicates some inversion at the XCS and
> XRES pins.
>
> This patch fixes things for a boot where the display was not
> touched by the bootloader
> diff --git a/arch/arm/boot/dts/omap3-gta04.dtsi b/arch/arm/boot/dts/omap3-gta04.dtsi
> index c8745bc800f7..003202d12990 100644
> --- a/arch/arm/boot/dts/omap3-gta04.dtsi
> +++ b/arch/arm/boot/dts/omap3-gta04.dtsi
> @@ -124,7 +124,6 @@
> spi-max-frequency = <100000>;
> spi-cpol;
> spi-cpha;
> - spi-cs-high;
>
> backlight= <&backlight>;
> label = "lcd";
>
> So if that one is really active-low, why did it ever work?!
Apparently, because there was patch f1f028ff89cb0d3 to fix 6953c57ab172 ...
BR,
Nikolaus
next prev parent reply other threads:[~2020-12-01 16:54 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-30 19:03 [BUG] SPI broken for SPI based panel drivers H. Nikolaus Schaller
2020-11-30 20:13 ` Sven Van Asbroeck
2020-11-30 20:22 ` Sven Van Asbroeck
2020-12-01 8:59 ` H. Nikolaus Schaller
2020-12-01 12:16 ` Mark Brown
2020-12-01 14:05 ` H. Nikolaus Schaller
2020-12-01 14:20 ` Linus Walleij
2020-12-01 14:34 ` Sven Van Asbroeck
2020-12-01 14:35 ` H. Nikolaus Schaller
2020-12-01 15:52 ` Sven Van Asbroeck
2020-12-01 16:46 ` H. Nikolaus Schaller
2020-12-01 16:10 ` Sven Van Asbroeck
2020-12-01 16:39 ` H. Nikolaus Schaller
2020-12-01 16:53 ` Sven Van Asbroeck
2020-12-01 17:10 ` H. Nikolaus Schaller
2020-12-01 18:43 ` Sven Van Asbroeck
2020-12-02 12:19 ` Mark Brown
2020-12-04 10:08 ` H. Nikolaus Schaller
2020-12-04 13:46 ` Sven Van Asbroeck
2020-12-04 16:49 ` H. Nikolaus Schaller
2020-12-04 19:19 ` Sven Van Asbroeck
2020-12-04 21:31 ` H. Nikolaus Schaller
2020-12-05 0:25 ` Linus Walleij
2020-12-05 7:04 ` H. Nikolaus Schaller
2020-12-09 8:04 ` Andreas Kemnade
2020-12-09 8:40 ` H. Nikolaus Schaller
2020-12-09 8:38 ` Linus Walleij
2020-12-09 8:45 ` H. Nikolaus Schaller
2020-12-01 22:51 ` Linus Walleij
2020-12-01 16:44 ` [Letux-kernel] " Andreas Kemnade
2020-12-01 16:51 ` H. Nikolaus Schaller [this message]
2020-12-01 16:52 ` H. Nikolaus Schaller
2020-12-01 16:55 ` Sven Van Asbroeck
2020-12-01 16:20 ` Mark Brown
2020-12-01 16:41 ` H. Nikolaus Schaller
2020-12-01 17:11 ` Mark Brown
2020-12-01 12:41 ` Sven Van Asbroeck
2020-12-01 13:32 ` H. Nikolaus Schaller
2020-12-01 14:08 ` Sven Van Asbroeck
2020-12-01 15:33 ` Mark Brown
2020-12-05 20:57 ` Pavel Machek
2020-12-07 13:43 ` Mark Brown
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