On Wed, 2017-05-03 at 17:28 -0700, Puthikorn Voravootivat wrote:
> There are some panel that
> (1) does not support display backlight enable via AUX
> (2) support display backlight adjustment via AUX
> (3) support display backlight enable via eDP BL_ENABLE pin
>
> The current driver required that (1) must be support to enable (2).
> This patch drops that requirement.
>
> Signed-off-by: Puthikorn Voravootivat <put...@chromium.org>
> ---
> drivers/gpu/drm/i915/intel_dp_aux_backlight.c | 5 ++++-
> 1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_dp_aux_backlight.c
> b/drivers/gpu/drm/i915/intel_dp_aux_backlight.c
> index ad8560c5f689..5b83c9737644 100644
> --- a/drivers/gpu/drm/i915/intel_dp_aux_backlight.c
> +++ b/drivers/gpu/drm/i915/intel_dp_aux_backlight.c
> @@ -28,6 +28,10 @@ static void set_aux_backlight_enable(struct intel_dp
> *intel_dp, bool enable)
> {
> uint8_t reg_val = 0;
>
> + /* Early return when display use other mechanism to enable backlight.
> */
> + if (!(intel_dp->edp_dpcd[1] & DP_EDP_BACKLIGHT_AUX_ENABLE_CAP))
> + return;
> +
How is backlight enabled in this case?
-DK
> if (drm_dp_dpcd_readb(&intel_dp->aux, DP_EDP_DISPLAY_CONTROL_REGISTER,
> ®_val) < 0) {
> DRM_DEBUG_KMS("Failed to read DPCD register 0x%x\n",
> @@ -164,7 +168,6 @@ intel_dp_aux_display_control_capable(struct
> intel_connector *connector)
> * the panel can support backlight control over the aux channel
> */
> if ((intel_dp->edp_dpcd[1] & DP_EDP_TCON_BACKLIGHT_ADJUSTMENT_CAP) &&
> - (intel_dp->edp_dpcd[1] & DP_EDP_BACKLIGHT_AUX_ENABLE_CAP) &&
> (intel_dp->edp_dpcd[2] & DP_EDP_BACKLIGHT_BRIGHTNESS_AUX_SET_CAP)) {
> DRM_DEBUG_KMS("AUX Backlight Control Supported!\n");
> return true;
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