On Wed, 19 Jun 2019, Lee Shawn C <[email protected]> wrote:
> If LFP backlight type setting from VBT was "VESA eDP AUX Interface".
> Driver should check panel capability and try to initialize aux backlight.
> No matter i915_modparams.enable_dpcd_backlight was enabled or not.
>
> v2: access dev_priv->vbt.backlight.type directly and remove unused function.
>
> Cc: Ville Syrjälä <[email protected]>
> Cc: Jani Nikula <[email protected]>
> Cc: Jose Roberto de Souza <[email protected]>
> Cc: Cooper Chiou <[email protected]>
>
> Signed-off-by: Lee Shawn C <[email protected]>
> ---
> drivers/gpu/drm/i915/display/intel_bios.h | 1 +
> drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c | 4 +++-
> 2 files changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_bios.h
> b/drivers/gpu/drm/i915/display/intel_bios.h
> index 4e42cfaf61a7..0b7be6389a07 100644
> --- a/drivers/gpu/drm/i915/display/intel_bios.h
> +++ b/drivers/gpu/drm/i915/display/intel_bios.h
> @@ -42,6 +42,7 @@ enum intel_backlight_type {
> INTEL_BACKLIGHT_DISPLAY_DDI,
> INTEL_BACKLIGHT_DSI_DCS,
> INTEL_BACKLIGHT_PANEL_DRIVER_INTERFACE,
> + INTEL_BACKLIGHT_VESA_EDP_AUX_INTERFACE,
> };
>
> struct edp_power_seq {
> diff --git a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
> b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
> index 7ded95a334db..db7c7b9f9b56 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
> @@ -264,8 +264,10 @@ intel_dp_aux_display_control_capable(struct
> intel_connector *connector)
> int intel_dp_aux_init_backlight_funcs(struct intel_connector
> *intel_connector)
> {
> struct intel_panel *panel = &intel_connector->panel;
> + struct drm_i915_private *dev_priv = to_i915(intel_connector->base.dev);
>
> - if (!i915_modparams.enable_dpcd_backlight)
> + if (!i915_modparams.enable_dpcd_backlight &&
> + (dev_priv->vbt.backlight.type !=
> INTEL_BACKLIGHT_VESA_EDP_AUX_INTERFACE))
> return -ENODEV;
There was also this part in the v1 review:
The usual thing to do is to set i915.enable_dpcd_backlight initial value
to -1 (i.e. make it an int), and with that default value respect
VBT. Otherwise, respect the value of enable_dpcd_backlight.
BR,
Jani.
>
> if (!intel_dp_aux_display_control_capable(intel_connector))
--
Jani Nikula, Intel Open Source Graphics Center
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