On Wed, 19 Jun 2019, Jani Nikula <jani.nikula@xxxxxxxxx> wrote:
>On Wed, 19 Jun 2019, Lee Shawn C <shawn.c.lee@xxxxxxxxx> 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 <ville.syrjala@xxxxxxxxxxxxxxx>
>> Cc: Jani Nikula <jani.nikula@xxxxxxxxx>
>> Cc: Jose Roberto de Souza <jose.souza@xxxxxxxxx>
>> Cc: Cooper Chiou <cooper.chiou@xxxxxxxxx>
>>
>> Signed-off-by: Lee Shawn C <shawn.c.lee@xxxxxxxxx>
>> ---
>> 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.
Do you mean we should do following?
1. Change i915.enable_dpcd_backlight type from bool to int.
2. Give default value as -1 for enable_dpcd_backlight in i915_param.h.
3. Add a judgement to check LFP backlight type was aux interface or not.
Between if (!i915_modparams.enable_dpcd_backlight) and
if (!intel_dp_aux_display_control_capable(intel_connector)).
Best regards,
Shawn
>>
>> if (!intel_dp_aux_display_control_capable(intel_connector))
>
>--
>Jani Nikula, Intel Open Source Graphics Center
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