From: Linus Walleij <linus.walleij@linaro.org>
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>,
"Lee Jones" <lee.jones@linaro.org>,
intel-gfx <intel-gfx@lists.freedesktop.org>,
"open list:DRM PANEL DRIVERS" <dri-devel@lists.freedesktop.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"open list:GPIO SUBSYSTEM" <linux-gpio@vger.kernel.org>
Subject: Re: [PATCH 5/5] drm/i915/dsi: Control panel and backlight enable GPIOs on BYT
Date: Mon, 16 Dec 2019 11:29:54 +0100 [thread overview]
Message-ID: <CACRpkdZCehawbGz+dELgjte6pTz0oEFQ3mo-2FuM4CQwm58tHQ@mail.gmail.com> (raw)
In-Reply-To: <20191215163810.52356-6-hdegoede@redhat.com>
On Sun, Dec 15, 2019 at 5:38 PM Hans de Goede <hdegoede@redhat.com> wrote:
> On Bay Trail devices the MIPI power on/off sequences for DSI LCD panels
> do not control the LCD panel- and backlight-enable GPIOs. So far, when
> the VBT indicates we should use the SoC for backlight control, 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 makes the DSI code control the SoC GPIOs for panel- and
> backlight-enable on BYT, when the VBT indicates the SoC should be used
>
> for backlight control. It also ensures that the PWM0 pin is muxed to the
> PWM controller in this case.
>
> This fixes the LCD panel not lighting up on various devices when booted
> with a HDMI monitor connected. This has been tested to fix this on the
> following devices:
>
> Peaq C1010
> Point of View MOBII TAB-P800W
> Point of View MOBII TAB-P1005W
> Terra Pad 1061
> Yours Y8W81
>
> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Looks good to me:
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Yours,
Linus Walleij
next prev parent reply other threads:[~2019-12-16 10:30 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-15 16:38 [PATCH 0/5] drm/i915/dsi: Control panel and backlight enable GPIOs from VBT Hans de Goede
2019-12-15 16:38 ` [PATCH 1/5] pinctrl: Export pinctrl_unregister_mappings Hans de Goede
2019-12-15 16:38 ` [PATCH 2/5] drm/i915/dsi: Move poking of panel-enable GPIO to intel_dsi_vbt.c Hans de Goede
2019-12-16 10:27 ` Linus Walleij
2019-12-16 13:51 ` Ville Syrjälä
2019-12-15 16:38 ` [PATCH 3/5] drm/i915/dsi: Init panel-enable GPIO to low when the LCD is initially off Hans de Goede
2019-12-16 10:28 ` Linus Walleij
2019-12-16 13:45 ` Ville Syrjälä
2019-12-16 13:51 ` Hans de Goede
2019-12-16 14:14 ` Ville Syrjälä
2019-12-16 14:59 ` Hans de Goede
2019-12-15 16:38 ` [PATCH 4/5] drm/i915/dsi: Move Crystal Cove PMIC panel GPIO lookup from mfd to the i915 driver Hans de Goede
2019-12-16 10:30 ` Linus Walleij
2019-12-16 12:16 ` Andy Shevchenko
2019-12-16 13:13 ` Hans de Goede
2019-12-16 13:56 ` Ville Syrjälä
2019-12-16 14:16 ` Hans de Goede
2019-12-15 16:38 ` [PATCH 5/5] drm/i915/dsi: Control panel and backlight enable GPIOs on BYT Hans de Goede
2019-12-16 10:29 ` Linus Walleij [this message]
2019-12-16 14:04 ` Ville Syrjälä
2019-12-16 14:28 ` Hans de Goede
2019-12-16 10:26 ` [PATCH 0/5] drm/i915/dsi: Control panel and backlight enable GPIOs from VBT Linus Walleij
2019-12-16 10:59 ` Hans de Goede
2019-12-16 11:11 ` Hans de Goede
2019-12-16 12:16 ` Linus Walleij
2019-12-16 13:25 ` Hans de Goede
2019-12-16 12:18 ` Andy Shevchenko
2019-12-16 16:10 ` Lee Jones
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