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From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To: Hans de Goede <hdegoede@redhat.com>
Cc: "Jani Nikula" <jani.nikula@linux.intel.com>,
	"Joonas Lahtinen" <joonas.lahtinen@linux.intel.com>,
	"Rodrigo Vivi" <rodrigo.vivi@intel.com>,
	"Ville Syrjälä" <ville.syrjala@linux.intel.com>,
	"Mika Westerberg" <mika.westerberg@linux.intel.com>,
	"Bartosz Golaszewski" <bgolaszewski@baylibre.com>,
	"Linus Walleij" <linus.walleij@linaro.org>,
	intel-gfx <intel-gfx@lists.freedesktop.org>,
	dri-devel@lists.freedesktop.org, linux-gpio@vger.kernel.org,
	linux-acpi@vger.kernel.org
Subject: Re: [PATCH 1/2] pinctrl: baytrail: Add GPIO lookup and pinctrl-map for i915 DSI panel ctrl
Date: Mon, 2 Dec 2019 15:09:06 +0200
Message-ID: <20191202130906.GH32742@smile.fi.intel.com> (raw)
In-Reply-To: <20191129185836.2789-2-hdegoede@redhat.com>

On Fri, Nov 29, 2019 at 07:58:35PM +0100, Hans de Goede wrote:
> On Bay Trail devices the MIPI power on/off sequences for DSI LCD panels
> do not control the LCD panel and backlight GPIOs. So far we have been
> relying on these GPIOs being configured as output and driven high by
> the Video BIOS (GOP) when it initializes the panel.
> 
> This does not work when the device is booted with a HDMI monitor connected
> as then the GOP will initialize the HDMI instead of the panel, leaving the
> panel black, even though the i915 driver tries to output an image to it.
> 
> Likewise on some device-models when the GOP does not initialize the DSI
> panel it also leaves the mux of the PWM0 pin in generic GPIO mode instead
> of muxing it to the PWM controller.
> 
> This commit adds GPIO lookups and a pinctrl-map which the i915 driver can
> use to get the panel- and backlight-enable GPIOs and to mux the PWM0 pin
> to the PWM controller.
> 
> Note it may seem a bit weird to add a pinctrl-map for the i915 driver,
> so that it can set the PWM0 pinmux. Doing this from the LPSS PWM driver
> would be more logical. But the only thing telling us that the pin should
> definitely be muxed to the PWM controller is the VBT to which the PWM
> driver does not have access.

My concern here, as one of Linus', is a pollution the driver with board code.
Aren't we able to split this to a separate file under PDx86 realm and do nasty
quirks there?

-- 
With Best Regards,
Andy Shevchenko



  parent reply index

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-29 18:58 [PATCH 0/2] drm/i915/vlv_dsi: Control panel and backlight enable GPIOs on BYT Hans de Goede
2019-11-29 18:58 ` [PATCH 1/2] pinctrl: baytrail: Add GPIO lookup and pinctrl-map for i915 DSI panel ctrl Hans de Goede
2019-12-02 11:39   ` Linus Walleij
2019-12-02 13:09   ` Andy Shevchenko [this message]
2019-11-29 18:58 ` [PATCH 2/2] drm/i915/vlv_dsi: Control panel and backlight enable GPIOs on BYT Hans de Goede
2019-12-02 11:21   ` Linus Walleij
2019-12-02 11:53     ` Jani Nikula
2019-12-02 15:49       ` Hans de Goede
2019-11-29 20:07 ` [PATCH 0/2] " Andy Shevchenko

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