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SubjectRe: [PATCH 3/5] drm/i915/dsi: Init panel-enable GPIO to low when the LCD is initially off
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

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