From: Sebastian Reichel <sre@kernel.org>
To: Tony Lindgren <tony@atomide.com>
Cc: "Dmitry Torokhov" <dmitry.torokhov@gmail.com>,
"Benoît Cousson" <bcousson@baylibre.com>,
"Krzysztof Kozlowski" <krzysztof.kozlowski+dt@linaro.org>,
"Rob Herring" <robh+dt@kernel.org>,
devicetree@vger.kernel.org, linux-omap@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/4] ARM: dts: omap3-n900: fix LCD reset line polarity
Date: Tue, 11 Oct 2022 14:37:26 +0200 [thread overview]
Message-ID: <20221011123726.elsr53ue7nxzhvww@mercury.elektranox.org> (raw)
In-Reply-To: <Y0UDEtQlN5Y9h7BU@atomide.com>
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Hi,
On Tue, Oct 11, 2022 at 08:45:54AM +0300, Tony Lindgren wrote:
> * Dmitry Torokhov <dmitry.torokhov@gmail.com> [221004 21:26]:
> > The LCD driver (panel-sony-acx565akm), when probing, starts with line
> > driven low, and then toggles it to high and keeps it there. Also, the
> > line is driven low when powering off the device, and ls released when
> > powering it back on. This means that the reset line should be described
> > as "active low" in DTS. This will be important when the driver is
> > converted to gpiod API which respects the polarity declared in DTS.
>
> We should ensure these patches get merged together with the driver
> change to avoid breaking LCD for booting. Probably no need to have
> the driver quirk handling for inverted polartity in this case.
>
> It's probably easiest to have an immutable branch for the driver
> changes I can base the dts changes on. Or I can ack the dts changes
> if they get merged with the driver.
Both drivers are already using gpiod API:
drivers/gpu/drm/panel/panel-sony-acx565akm.c
drivers/gpu/drm/panel/panel-dsi-cm.c
So this just breaks things.
-- Sebastian
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next prev parent reply other threads:[~2022-10-11 12:37 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-04 21:35 [PATCH 1/4] ARM: dts: omap3-n900: fix LCD reset line polarity Dmitry Torokhov
2022-10-04 21:35 ` [PATCH 2/4] ARM: dts: omap4-sdp: " Dmitry Torokhov
2022-10-04 21:35 ` [PATCH 3/4] ARM: dts: omap3-n950: " Dmitry Torokhov
2022-10-04 21:35 ` [PATCH 4/4] ARM: dts: motorola-mapphone: " Dmitry Torokhov
2022-10-11 5:45 ` [PATCH 1/4] ARM: dts: omap3-n900: " Tony Lindgren
2022-10-11 12:37 ` Sebastian Reichel [this message]
2022-10-11 14:06 ` Dmitry Torokhov
2022-10-11 14:30 ` Tony Lindgren
2022-10-11 14:38 ` Dmitry Torokhov
2022-10-11 14:47 ` Tony Lindgren
2022-10-12 10:58 ` Tomi Valkeinen
2022-10-12 19:30 ` Dmitry Torokhov
2022-10-13 6:22 ` Tomi Valkeinen
2022-10-13 11:08 ` Tony Lindgren
2022-10-13 13:17 ` Sebastian Reichel
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