From: "Ville Syrjälä" <ville.syrjala@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>,
Lee Jones <lee.jones@linaro.org>,
Linus Walleij <linus.walleij@linaro.org>,
intel-gfx <intel-gfx@lists.freedesktop.org>,
dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org,
linux-gpio@vger.kernel.org
Subject: Re: [PATCH 3/5] drm/i915/dsi: Init panel-enable GPIO to low when the LCD is initially off
Date: Mon, 16 Dec 2019 15:45:51 +0200 [thread overview]
Message-ID: <20191216134551.GQ1208@intel.com> (raw)
In-Reply-To: <20191215163810.52356-4-hdegoede@redhat.com>
On Sun, Dec 15, 2019 at 05:38:08PM +0100, Hans de Goede wrote:
> When the LCD has not been turned on by the firmware/GOP, because e.g. the
> device was booted with an external monitor connected over HDMI, we should
> not turn on the panel-enable GPIO when we request it.
>
> Turning on the panel-enable GPIO when we request it, means we turn it on
> too early in the init-sequence, which causes some panels to not correctly
> light up.
>
> This commits adds a panel_is_on parameter to intel_dsi_vbt_gpio_init()
> and makes intel_dsi_vbt_gpio_init() set the initial GPIO value accordingly.
>
> This fixes the panel not lighting up on a Thundersoft TST168 tablet when
> booted with an external monitor connected over HDMI.
>
> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
> ---
> drivers/gpu/drm/i915/display/intel_dsi.h | 2 +-
> drivers/gpu/drm/i915/display/intel_dsi_vbt.c | 7 +++----
> drivers/gpu/drm/i915/display/vlv_dsi.c | 2 +-
> 3 files changed, 5 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_dsi.h b/drivers/gpu/drm/i915/display/intel_dsi.h
> index de7e51cd3460..675771ea91aa 100644
> --- a/drivers/gpu/drm/i915/display/intel_dsi.h
> +++ b/drivers/gpu/drm/i915/display/intel_dsi.h
> @@ -203,7 +203,7 @@ void bxt_dsi_reset_clocks(struct intel_encoder *encoder, enum port port);
>
> /* intel_dsi_vbt.c */
> bool intel_dsi_vbt_init(struct intel_dsi *intel_dsi, u16 panel_id);
> -void intel_dsi_vbt_gpio_init(struct intel_dsi *intel_dsi);
> +void intel_dsi_vbt_gpio_init(struct intel_dsi *intel_dsi, bool panel_is_on);
> void intel_dsi_vbt_gpio_cleanup(struct intel_dsi *intel_dsi);
> void intel_dsi_vbt_exec_sequence(struct intel_dsi *intel_dsi,
> enum mipi_seq seq_id);
> diff --git a/drivers/gpu/drm/i915/display/intel_dsi_vbt.c b/drivers/gpu/drm/i915/display/intel_dsi_vbt.c
> index 5352e8c9eca5..027970348b22 100644
> --- a/drivers/gpu/drm/i915/display/intel_dsi_vbt.c
> +++ b/drivers/gpu/drm/i915/display/intel_dsi_vbt.c
> @@ -688,17 +688,16 @@ bool intel_dsi_vbt_init(struct intel_dsi *intel_dsi, u16 panel_id)
> * On some BYT/CHT devs some sequences are incomplete and we need to manually
> * control some GPIOs.
> */
> -void intel_dsi_vbt_gpio_init(struct intel_dsi *intel_dsi)
> +void intel_dsi_vbt_gpio_init(struct intel_dsi *intel_dsi, bool panel_is_on)
> {
> struct drm_device *dev = intel_dsi->base.base.dev;
> struct drm_i915_private *dev_priv = to_i915(dev);
> struct mipi_config *mipi_config = dev_priv->vbt.dsi.config;
> + enum gpiod_flags flags = panel_is_on ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW;
Can't we just tell it not to change the current setting?
>
> if ((IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) &&
> (mipi_config->pwm_blc == PPS_BLC_PMIC)) {
> - intel_dsi->gpio_panel =
> - gpiod_get(dev->dev, "panel", GPIOD_OUT_HIGH);
> -
> + intel_dsi->gpio_panel = gpiod_get(dev->dev, "panel", flags);
> if (IS_ERR(intel_dsi->gpio_panel)) {
> DRM_ERROR("Failed to own gpio for panel control\n");
> intel_dsi->gpio_panel = NULL;
> diff --git a/drivers/gpu/drm/i915/display/vlv_dsi.c b/drivers/gpu/drm/i915/display/vlv_dsi.c
> index 178d0fffba5b..e86e4a11e199 100644
> --- a/drivers/gpu/drm/i915/display/vlv_dsi.c
> +++ b/drivers/gpu/drm/i915/display/vlv_dsi.c
> @@ -1910,7 +1910,7 @@ void vlv_dsi_init(struct drm_i915_private *dev_priv)
>
> vlv_dphy_param_init(intel_dsi);
>
> - intel_dsi_vbt_gpio_init(intel_dsi);
> + intel_dsi_vbt_gpio_init(intel_dsi, current_mode != NULL);
>
> drm_connector_init(dev, connector, &intel_dsi_connector_funcs,
> DRM_MODE_CONNECTOR_DSI);
> --
> 2.23.0
--
Ville Syrjälä
Intel
next prev parent reply other threads:[~2019-12-16 13:45 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 [this message]
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
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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