From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Sharma, Shashank" Subject: Re: [PATCH v3 3/4] drm/i915: Enable/disable TMDS output buffers in DP++ adaptor as needed Date: Wed, 04 May 2016 15:43:30 +0530 Message-ID: <5729CB4A.90607@intel.com> References: <1462216105-20881-1-git-send-email-ville.syrjala@linux.intel.com> <1462216105-20881-4-git-send-email-ville.syrjala@linux.intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: <1462216105-20881-4-git-send-email-ville.syrjala@linux.intel.com> Sender: stable-owner@vger.kernel.org To: ville.syrjala@linux.intel.com, dri-devel@lists.freedesktop.org Cc: intel-gfx@lists.freedesktop.org, stable@vger.kernel.org, Tore Anderson , Paulo Zanoni , Daniel Vetter List-Id: intel-gfx@lists.freedesktop.org On 5/3/2016 12:38 AM, ville.syrjala@linux.intel.com wrote: > From: Ville Syrj=C3=A4l=C3=A4 > > To save a bit of power, let's try to turn off the TMDS output buffers > in DP++ adaptors when we're not driving the port. > > v2: Let's not forget DDI, toss in a debug message while at it > v3: Just do the TMDS output control based on adaptor type. With the > helper getting passed the type, we wouldn't actually have to > check at all in the driver, but the check eliminates the debug > output more honest > > Cc: stable@vger.kernel.org > Cc: Tore Anderson > Cc: Paulo Zanoni > Cc: Shashank Sharma > Cc: Daniel Vetter > Signed-off-by: Ville Syrj=C3=A4l=C3=A4 > --- > drivers/gpu/drm/i915/intel_ddi.c | 12 ++++++++++++ > drivers/gpu/drm/i915/intel_drv.h | 1 + > drivers/gpu/drm/i915/intel_hdmi.c | 20 ++++++++++++++++++++ > 3 files changed, 33 insertions(+) > > diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/= intel_ddi.c > index 422ec81ef59b..a3600704e6d4 100644 > --- a/drivers/gpu/drm/i915/intel_ddi.c > +++ b/drivers/gpu/drm/i915/intel_ddi.c > @@ -1601,6 +1601,12 @@ static void intel_ddi_pre_enable(struct intel_= encoder *intel_encoder) > enum port port =3D intel_ddi_get_encoder_port(intel_encoder); > int type =3D intel_encoder->type; > > + if (type =3D=3D INTEL_OUTPUT_HDMI) { how to handle type2 active adapters here, which can show type =3D DP ? > + struct intel_hdmi *intel_hdmi =3D enc_to_intel_hdmi(encoder); > + > + intel_dp_dual_mode_set_tmds_output(intel_hdmi, true); > + } > + > intel_prepare_ddi_buffer(intel_encoder); > > if (type =3D=3D INTEL_OUTPUT_EDP) { > @@ -1667,6 +1673,12 @@ static void intel_ddi_post_disable(struct inte= l_encoder *intel_encoder) > DPLL_CTRL2_DDI_CLK_OFF(port))); > else if (INTEL_INFO(dev)->gen < 9) > I915_WRITE(PORT_CLK_SEL(port), PORT_CLK_SEL_NONE); > + > + if (type =3D=3D INTEL_OUTPUT_HDMI) { Same as above. Regards Shashank > + struct intel_hdmi *intel_hdmi =3D enc_to_intel_hdmi(encoder); > + > + intel_dp_dual_mode_set_tmds_output(intel_hdmi, false); > + } > } > > static void intel_enable_ddi(struct intel_encoder *intel_encoder) > diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/= intel_drv.h > index e94d18fb2ff1..dbcb80c70e2e 100644 > --- a/drivers/gpu/drm/i915/intel_drv.h > +++ b/drivers/gpu/drm/i915/intel_drv.h > @@ -1419,6 +1419,7 @@ void intel_hdmi_init_connector(struct intel_dig= ital_port *intel_dig_port, > struct intel_hdmi *enc_to_intel_hdmi(struct drm_encoder *encoder); > bool intel_hdmi_compute_config(struct intel_encoder *encoder, > struct intel_crtc_state *pipe_config); > +void intel_dp_dual_mode_set_tmds_output(struct intel_hdmi *hdmi, boo= l enable); > > > /* intel_lvds.c */ > diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915= /intel_hdmi.c > index 31ca11134294..c4d93e6b4bed 100644 > --- a/drivers/gpu/drm/i915/intel_hdmi.c > +++ b/drivers/gpu/drm/i915/intel_hdmi.c > @@ -836,6 +836,22 @@ static void hsw_set_infoframes(struct drm_encode= r *encoder, > intel_hdmi_set_hdmi_infoframe(encoder, adjusted_mode); > } > > +void intel_dp_dual_mode_set_tmds_output(struct intel_hdmi *hdmi, boo= l enable) > +{ > + struct drm_i915_private *dev_priv =3D to_i915(intel_hdmi_to_dev(hdm= i)); > + struct i2c_adapter *adapter =3D > + intel_gmbus_get_adapter(dev_priv, hdmi->ddc_bus); > + > + if (hdmi->dp_dual_mode.type < DRM_DP_DUAL_MODE_TYPE2_DVI) > + return; > + > + DRM_DEBUG_KMS("%s DP dual mode adaptor TMDS output\n", > + enable ? "Enabling" : "Disabling"); > + > + drm_dp_dual_mode_set_tmds_output(hdmi->dp_dual_mode.type, > + adapter, enable); > +} > + > static void intel_hdmi_prepare(struct intel_encoder *encoder) > { > struct drm_device *dev =3D encoder->base.dev; > @@ -845,6 +861,8 @@ static void intel_hdmi_prepare(struct intel_encod= er *encoder) > const struct drm_display_mode *adjusted_mode =3D &crtc->config->ba= se.adjusted_mode; > u32 hdmi_val; > > + intel_dp_dual_mode_set_tmds_output(intel_hdmi, true); > + > hdmi_val =3D SDVO_ENCODING_HDMI; > if (!HAS_PCH_SPLIT(dev) && crtc->config->limited_color_range) > hdmi_val |=3D HDMI_COLOR_RANGE_16_235; > @@ -1142,6 +1160,8 @@ static void intel_disable_hdmi(struct intel_enc= oder *encoder) > } > > intel_hdmi->set_infoframes(&encoder->base, false, NULL); > + > + intel_dp_dual_mode_set_tmds_output(intel_hdmi, false); > } > > static void g4x_disable_hdmi(struct intel_encoder *encoder) >