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Wed, 6 Oct 2021 03:09:07 +0000 (UTC) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 7bit Date: Tue, 05 Oct 2021 20:09:07 -0700 From: abhinavk@codeaurora.org To: Bjorn Andersson Cc: Rob Clark , Sean Paul , David Airlie , Daniel Vetter , Dmitry Baryshkov , Kalyan Thota , Kuogee Hsieh , Rob Herring , Stephen Boyd , linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org, linux-kernel@vger.kernel.org Subject: Re: [Freedreno] [PATCH v4 4/7] drm/msm/dp: Allow attaching a drm_panel In-Reply-To: References: <20211005231323.2663520-1-bjorn.andersson@linaro.org> <20211005231323.2663520-5-bjorn.andersson@linaro.org> <28fbd8f5b2d6bae7bedfc7e81e3fddd9@codeaurora.org> Message-ID: <1238652fd3200a71a92a5f46e63dd50d@codeaurora.org> X-Sender: abhinavk@codeaurora.org User-Agent: Roundcube Webmail/1.3.9 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org On 2021-10-05 19:09, Bjorn Andersson wrote: > On Tue 05 Oct 17:35 PDT 2021, abhinavk@codeaurora.org wrote: > >> Hi Bjorn >> >> On 2021-10-05 16:13, Bjorn Andersson wrote: >> > eDP panels might need some power sequencing and backlight management, >> > so make it possible to associate a drm_panel with an eDP instance and >> > prepare and enable the panel accordingly. >> > >> > Now that we know which hardware instance is DP and which is eDP, >> > parser->parse() is passed the connector_type and the parser is limited >> > to only search for a panel in the eDP case. >> > >> > Signed-off-by: Bjorn Andersson >> > --- >> > >> > Changes since v3: >> > - Previously posted separately, now added to series >> > - Make the search for a panel conditional on it being an eDP connector >> > - Move the search to of_graph port 1 (was 2 to distinguish from DP >> > link to USB-C connector) >> > >> > drivers/gpu/drm/msm/dp/dp_display.c | 9 ++++++--- >> > drivers/gpu/drm/msm/dp/dp_display.h | 1 + >> > drivers/gpu/drm/msm/dp/dp_drm.c | 11 +++++++++++ >> > drivers/gpu/drm/msm/dp/dp_parser.c | 30 ++++++++++++++++++++++++++++- >> > drivers/gpu/drm/msm/dp/dp_parser.h | 3 ++- >> > 5 files changed, 49 insertions(+), 5 deletions(-) >> > >> > diff --git a/drivers/gpu/drm/msm/dp/dp_display.c >> > b/drivers/gpu/drm/msm/dp/dp_display.c >> > index eaf08f9e7d87..bdaf227f05dc 100644 >> > --- a/drivers/gpu/drm/msm/dp/dp_display.c >> > +++ b/drivers/gpu/drm/msm/dp/dp_display.c >> > @@ -10,6 +10,7 @@ >> > #include >> > #include >> > #include >> > +#include >> > >> > #include "msm_drv.h" >> > #include "msm_kms.h" >> > @@ -230,12 +231,14 @@ static int dp_display_bind(struct device *dev, >> > struct device *master, >> > priv = drm->dev_private; >> > priv->dp = &(dp->dp_display); >> > >> > - rc = dp->parser->parse(dp->parser); >> > + rc = dp->parser->parse(dp->parser, dp->dp_display.connector_type); >> > if (rc) { >> > DRM_ERROR("device tree parsing failed\n"); >> > goto end; >> > } >> > >> > + dp->dp_display.panel_bridge = dp->parser->panel_bridge; >> > + >> > dp->aux->drm_dev = drm; >> > rc = dp_aux_register(dp->aux); >> > if (rc) { >> > @@ -822,7 +825,7 @@ static int dp_display_set_mode(struct msm_dp >> > *dp_display, >> > return 0; >> > } >> > >> > -static int dp_display_prepare(struct msm_dp *dp) >> > +static int dp_display_prepare(struct msm_dp *dp_display) >> > { >> > return 0; >> > } >> > @@ -896,7 +899,7 @@ static int dp_display_disable(struct >> > dp_display_private *dp, u32 data) >> > return 0; >> > } >> > >> > -static int dp_display_unprepare(struct msm_dp *dp) >> > +static int dp_display_unprepare(struct msm_dp *dp_display) >> > { >> > return 0; >> > } >> > diff --git a/drivers/gpu/drm/msm/dp/dp_display.h >> > b/drivers/gpu/drm/msm/dp/dp_display.h >> > index 02999408c052..24aefca66029 100644 >> > --- a/drivers/gpu/drm/msm/dp/dp_display.h >> > +++ b/drivers/gpu/drm/msm/dp/dp_display.h >> > @@ -15,6 +15,7 @@ struct msm_dp { >> > struct device *codec_dev; >> > struct drm_connector *connector; >> > struct drm_encoder *encoder; >> > + struct drm_bridge *panel_bridge; >> > bool is_connected; >> > bool audio_enabled; >> > bool power_on; >> > diff --git a/drivers/gpu/drm/msm/dp/dp_drm.c >> > b/drivers/gpu/drm/msm/dp/dp_drm.c >> > index f33e31523f56..76856c4ee1d6 100644 >> > --- a/drivers/gpu/drm/msm/dp/dp_drm.c >> > +++ b/drivers/gpu/drm/msm/dp/dp_drm.c >> > @@ -5,6 +5,7 @@ >> > >> > #include >> > #include >> > +#include >> > #include >> > >> > #include "msm_drv.h" >> > @@ -160,5 +161,15 @@ struct drm_connector >> > *dp_drm_connector_init(struct msm_dp *dp_display) >> > >> > drm_connector_attach_encoder(connector, dp_display->encoder); >> > >> > + if (dp_display->panel_bridge) { >> > + ret = drm_bridge_attach(dp_display->encoder, >> > + dp_display->panel_bridge, NULL, >> > + DRM_BRIDGE_ATTACH_NO_CONNECTOR); >> > + if (ret < 0) { >> > + DRM_ERROR("failed to attach panel bridge: %d\n", ret); >> > + return ERR_PTR(ret); >> > + } >> > + } >> > + >> > return connector; >> > } >> > diff --git a/drivers/gpu/drm/msm/dp/dp_parser.c >> > b/drivers/gpu/drm/msm/dp/dp_parser.c >> > index 4d6e047f803d..eb6bbfbea484 100644 >> > --- a/drivers/gpu/drm/msm/dp/dp_parser.c >> > +++ b/drivers/gpu/drm/msm/dp/dp_parser.c >> > @@ -6,6 +6,7 @@ >> > #include >> > #include >> > >> > +#include >> > #include >> > >> > #include "dp_parser.h" >> > @@ -263,7 +264,28 @@ static int dp_parser_clock(struct dp_parser >> > *parser) >> > return 0; >> > } >> > >> > -static int dp_parser_parse(struct dp_parser *parser) >> > +static int dp_parser_find_panel(struct dp_parser *parser) >> > +{ >> > + struct device *dev = &parser->pdev->dev; >> > + struct drm_panel *panel; >> > + int rc; >> > + >> > + rc = drm_of_find_panel_or_bridge(dev->of_node, 1, 0, &panel, NULL); >> > + if (rc) { >> > + DRM_ERROR("failed to acquire DRM panel: %d\n", rc); >> > + return rc; >> > + } >> > + >> > + parser->panel_bridge = devm_drm_panel_bridge_add(dev, panel); >> > + if (IS_ERR(parser->panel_bridge)) { >> > + DRM_ERROR("failed to create panel bridge\n"); >> > + return PTR_ERR(parser->panel_bridge); >> > + } >> >> When we add a bridge using devm_drm_panel_bridge_add(), it will >> register >> with default bridge functions which is fine >> because we need the panel power to be controlled here. >> >> >> 140 static const struct drm_bridge_funcs panel_bridge_bridge_funcs = { >> 141 .attach = panel_bridge_attach, >> 142 .detach = panel_bridge_detach, >> 143 .pre_enable = panel_bridge_pre_enable, >> 144 .enable = panel_bridge_enable, >> 145 .disable = panel_bridge_disable, >> 146 .post_disable = panel_bridge_post_disable, >> 147 .get_modes = panel_bridge_get_modes, >> >> But what about the EDID related things, the DP/eDP driver already >> reads the >> EDID and gets the modes so we need to skip >> that in this case as otherwise it will end up calling the >> panel_get_modes in >> the eDP panel which will be redundant. >> >> Let me know if I am missing something in this proposal. >> > > I'm slightly lost when it comes to these types, so can you please help > me understand why the panel_bridge_bridge_funcs->get_modes() would be > invoked with the proposed patches. > > Because adding a log print in panel_bridge_get_modes() shows that it's > not invoked. > > > So I think we have the opposite problem, rather than having two > redundant get_modes we only support relying on the EDID information > directly in the DP driver, at this point. > > So unless I'm missing something critical, this works and provides panel > and backlight controls and the additional work to move the EDID read > out > to the panel driver would better be done after this initial support > lands? > > Regards, > Bjorn I missed this line which uses the DRM_BRIDGE_ATTACH_NO_CONNECTOR + ret = drm_bridge_attach(dp_display->encoder, + dp_display->panel_bridge, NULL, + DRM_BRIDGE_ATTACH_NO_CONNECTOR); In this case, no separate connector will get created and hence get_modes will not be called again since this is just a virtual bridge. That explains why your log didnt show up. I will continue checking the rest of this patch. > >> > + >> > + return 0; >> > +} >> > + >> > +static int dp_parser_parse(struct dp_parser *parser, int >> > connector_type) >> > { >> > int rc = 0; >> > >> > @@ -284,6 +306,12 @@ static int dp_parser_parse(struct dp_parser >> > *parser) >> > if (rc) >> > return rc; >> > >> > + if (connector_type == DRM_MODE_CONNECTOR_eDP) { >> > + rc = dp_parser_find_panel(parser); >> > + if (rc) >> > + return rc; >> > + } >> > + >> > /* Map the corresponding regulator information according to >> > * version. Currently, since we only have one supported platform, >> > * mapping the regulator directly. >> > diff --git a/drivers/gpu/drm/msm/dp/dp_parser.h >> > b/drivers/gpu/drm/msm/dp/dp_parser.h >> > index dac10923abde..3172da089421 100644 >> > --- a/drivers/gpu/drm/msm/dp/dp_parser.h >> > +++ b/drivers/gpu/drm/msm/dp/dp_parser.h >> > @@ -123,8 +123,9 @@ struct dp_parser { >> > struct dp_display_data disp_data; >> > const struct dp_regulator_cfg *regulator_cfg; >> > u32 max_dp_lanes; >> > + struct drm_bridge *panel_bridge; >> > >> > - int (*parse)(struct dp_parser *parser); >> > + int (*parse)(struct dp_parser *parser, int connector_type); >> > }; >> > >> > /**