On Tue, 2017-06-13 at 08:29 +0200, Maarten Lankhorst wrote:
> Op 12-06-17 om 22:16 schreef Dhinakaran Pandiyan:
> > Maarten and Ville noticed that we are enabling backlight via DP aux very
> > early in the modeset_init path via the intel_dp_aux_setup_backlight()
> > function. Looks like all we need to do during _setup_backlight() is
> > read the current brightness state instead of modifying it, so I don't
> > why need to _enable_backlight() from _setup_backlight().
> >
> > Cc: Ville Syrjala <ville.syrj...@linux.intel.com>
> > Cc: Maarten Lankhorst <maarten.lankho...@linux.intel.com>
> > Cc: Jani Nikula <jani.nik...@intel.com>
> > Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandi...@intel.com>
> > ---
> > drivers/gpu/drm/i915/intel_dp_aux_backlight.c | 10 ----------
> > 1 file changed, 10 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/intel_dp_aux_backlight.c
> > b/drivers/gpu/drm/i915/intel_dp_aux_backlight.c
> > index 6cc6298..228ca06 100644
> > --- a/drivers/gpu/drm/i915/intel_dp_aux_backlight.c
> > +++ b/drivers/gpu/drm/i915/intel_dp_aux_backlight.c
> > @@ -80,10 +80,6 @@ static uint32_t intel_dp_aux_get_backlight(struct
> > intel_connector *connector)
> > static void
> > intel_dp_aux_set_backlight(const struct drm_connector_state *conn_state,
> > u32 level)
> > {
> > - /*
> > - * conn_state->best_encoder is likely NULL when called from
> > - * intel_dp_aux_setup_backlight()
> > - */
> > struct intel_connector *connector =
> > to_intel_connector(conn_state->connector);
> > struct intel_dp *intel_dp = enc_to_intel_dp(&connector->encoder->base);
> > uint8_t vals[2] = { 0x0 };
> > @@ -106,10 +102,6 @@ static void intel_dp_aux_enable_backlight(const struct
> > intel_crtc_state *crtc_st
> > const struct drm_connector_state
> > *conn_state)
> > {
> > struct intel_connector *connector =
> > to_intel_connector(conn_state->connector);
> > - /*
> > - * conn_state->best_encoder (and crtc_state) are NULL when called from
> > - * intel_dp_aux_setup_backlight()
> > - */
> > struct intel_dp *intel_dp = enc_to_intel_dp(&connector->encoder->base);
> Maybe change this one to conn_state->best_encoder now? Same as for
> set_backlight. Needs some runtime testing though. :)
I see four instances that need to be converted, I should perhaps do it a
in a separate patch. But, I can't seem to get brightness control working
on the SDP I have here. So, I'm a bit wary of doing it until I can bench
test properly.
Thanks for the review.
-DK
> > uint8_t dpcd_buf = 0;
> > uint8_t edp_backlight_mode = 0;
> > @@ -156,8 +148,6 @@ static int intel_dp_aux_setup_backlight(struct
> > intel_connector *connector,
> > struct intel_dp *intel_dp = enc_to_intel_dp(&connector->encoder->base);
> > struct intel_panel *panel = &connector->panel;
> >
> > - intel_dp_aux_enable_backlight(NULL, connector->base.state);
> > -
> > if (intel_dp->edp_dpcd[2] & DP_EDP_BACKLIGHT_BRIGHTNESS_BYTE_COUNT)
> > panel->backlight.max = 0xFFFF;
> > else
> Reviewed-by: Maarten Lankhorst <maarten.lankho...@linux.intel.com>
>
> Cheers,
>
> Maarten
>
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