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@xxxxxxxxxx> > --- > 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 _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel