From: Douglas Anderson <dianders@chromium.org> To: Andrzej Hajda <a.hajda@samsung.com>, Neil Armstrong <narmstrong@baylibre.com>, Laurent Pinchart <Laurent.pinchart@ideasonboard.com>, Jonas Karlman <jonas@kwiboo.se>, Jernej Skrabec <jernej.skrabec@siol.net>, Sam Ravnborg <sam@ravnborg.org>, Wolfram Sang <wsa@kernel.org> Cc: Stephen Boyd <swboyd@chromium.org>, robdclark@chromium.org, Maarten Lankhorst <maarten.lankhorst@linux.intel.com>, Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>, Steev Klimaszewski <steev@kali.org>, Bjorn Andersson <bjorn.andersson@linaro.org>, linux-arm-msm@vger.kernel.org, Linus W <linus.walleij@linaro.org>, Douglas Anderson <dianders@chromium.org>, Andy Gross <agross@kernel.org>, Boris Brezillon <boris.brezillon@collabora.com>, Daniel Vetter <daniel@ffwll.ch>, David Airlie <airlied@linux.ie>, Laurent Pinchart <laurent.pinchart@ideasonboard.com>, Maxime Ripard <mripard@kernel.org>, Rob Herring <robh+dt@kernel.org>, Robert Foss <robert.foss@linaro.org>, Thierry Reding <thierry.reding@gmail.com>, Thomas Zimmermann <tzimmermann@suse.de>, devicetree@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v4 00/27] drm: Fix EDID reading on ti-sn65dsi86; solve some chicken-and-egg problems Date: Fri, 16 Apr 2021 15:39:23 -0700 [thread overview] Message-ID: <20210416223950.3586967-1-dianders@chromium.org> (raw) The primary goal of this series is to try to properly fix EDID reading for eDP panels using the ti-sn65dsi86 bridge. Previously we had a patch that added EDID reading but it turned out not to work at bootup. This caused some extra churn at bootup as we tried (and failed) to read the EDID several times and also ended up forcing us to use the hardcoded mode at boot. With this patch series I believe EDID reading is reliable at boot now and we never use the hardcoded mode. This series is the logical successor to the 3-part series containing the patch ("drm/bridge: ti-sn65dsi86: Properly get the EDID, but only if refclk") [1] though only one actual patch is the same between the two. This series starts out with some general / obvious fixes and moves on to some more specific and maybe controversial ones. I wouldn't object to some of the earlier ones landing if they look ready. This patch was developed agains linuxnext (next-20210416) on a sc7180-trogdor-lazor device. To get things booting for me, I had to use Stephen's patch [2] to keep from crashing but otherwise all the patches I needed were here. Primary change between v2 and v3 is to stop doing the EDID caching in the core. I also added Andrzej's review tags. Between v3 and v4 this series grew a whole lot. I changed it so that the EDID reading is actually driven by the panel driver now as was suggested by Andrzej. While I still believe that the old approach wasn't too bad I'm still switching. Why? The main reason is that I think it's useful in general for the panel code to have access to the DDC bus and to be able to read the EDID. This may allow us to more easily have the panel code support multiple sources of panels--it can read the EDID and possibly adjust timings based on the model ID. It also allows the panel code (or perhaps backlight code?) to send DDC commands if they are need for a particular panel. At the moment, once the panel is provided the DDC bus then existing code will assume that it should be in charge of reading the EDID. While it doesn't have to work that way, it seems sane to build on what's already there. In order to expose the DDC bus to the panel, I had to solve a bunch of chicken-and-egg problems in terms of probe ordering between the bridge and the panel. I've broken the bridge driver into several sub drivers to make this happen. At the moment the sub-drivers are just there to solve the probe problem, but conceivably someone could use them to break the driver up in the future if need be. I apologize in advance for the length of this series. I'm currently working through getting commit access to drm-misc [3] so I can land the first several patches which are already reviewed. There are still a lot of patches even after the first few, but hopefully you can see that there are only so many because they're broken up into nice and reviewable bite-sized-chunks. :-) [1] https://lore.kernel.org/r/20210304155144.3.I60a7fb23ce4589006bc95c64ab8d15c74b876e68@changeid/ [2] https://lore.kernel.org/r/161706912161.3012082.17313817257247946143@swboyd.mtv.corp.google.com/ [3] https://gitlab.freedesktop.org/freedesktop/freedesktop/-/issues/348 Changes in v4: - Reword commit mesage slightly. Changes in v3: - Removed "NOTES" from commit message. Changes in v2: - Removed 2nd paragraph in commit message. Douglas Anderson (27): drm/bridge: Fix the stop condition of drm_bridge_chain_pre_enable() drm/bridge: ti-sn65dsi86: Simplify refclk handling drm/bridge: ti-sn65dsi86: Remove incorrectly tagged kerneldoc comment drm/bridge: ti-sn65dsi86: Reorder remove() drm/bridge: ti-sn65dsi86: Move drm_panel_unprepare() to post_disable() drm/bridge: ti-sn65dsi86: Get rid of the useless detect() function drm/panel: panel-simple: Use runtime pm to avoid excessive unprepare / prepare drm/bridge: ti-sn65dsi86: Rename the main driver data structure drm/bridge: ti-sn65dsi86: More renames in prep for sub-devices drm/bridge: ti-sn65dsi86: Clean debugfs code drm/bridge: ti-sn65dsi86: Add local var for "dev" to simplify probe drm/bridge: ti-sn65dsi86: Cleanup managing of drvdata drm/bridge: ti-sn65dsi86: Use devm to do our runtime_disable drm/bridge: ti-sn65dsi86: Move all the chip-related init to the start drm/bridge: ti-sn65dsi86: Break GPIO and MIPI-to-eDP bridge into sub-drivers drm/panel: panel-simple: Get rid of hacky HPD chicken-and-egg code drm/bridge: ti-sn65dsi86: Use pm_runtime autosuspend drm/bridge: ti-sn65dsi86: Code motion of refclk management functions drm/bridge: ti-sn65dsi86: If refclk, DP AUX can happen w/out pre-enable drm/bridge: ti-sn65dsi86: Promote the AUX channel to its own sub-dev i2c: i2c-core-of: Fix corner case of finding adapter by node drm/panel: panel-simple: Remove extra call: drm_connector_update_edid_property() drm/panel: panel-simple: Power the panel when reading the EDID drm/panel: panel-simple: Cache the EDID as long as we retain power drm/bridge: ti-sn65dsi86: Don't read EDID blob over DDC arm64: dts: qcom: Link the panel to the bridge's DDC bus drm/panel: panel-simple: Prepare/unprepare are refcounted, not forced arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi | 1 + drivers/gpu/drm/bridge/Kconfig | 1 + drivers/gpu/drm/bridge/ti-sn65dsi86.c | 748 ++++++++++++------- drivers/gpu/drm/drm_bridge.c | 3 + drivers/gpu/drm/panel/Kconfig | 1 + drivers/gpu/drm/panel/panel-simple.c | 123 +-- drivers/i2c/i2c-core-of.c | 17 +- 7 files changed, 555 insertions(+), 339 deletions(-) -- 2.31.1.368.gbe11c130af-goog
WARNING: multiple messages have this Message-ID (diff)
From: Douglas Anderson <dianders@chromium.org> To: Andrzej Hajda <a.hajda@samsung.com>, Neil Armstrong <narmstrong@baylibre.com>, Laurent Pinchart <Laurent.pinchart@ideasonboard.com>, Jonas Karlman <jonas@kwiboo.se>, Jernej Skrabec <jernej.skrabec@siol.net>, Sam Ravnborg <sam@ravnborg.org>, Wolfram Sang <wsa@kernel.org> Cc: David Airlie <airlied@linux.ie>, Steev Klimaszewski <steev@kali.org>, Bjorn Andersson <bjorn.andersson@linaro.org>, Thierry Reding <thierry.reding@gmail.com>, Laurent Pinchart <laurent.pinchart@ideasonboard.com>, robdclark@chromium.org, Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>, Andy Gross <agross@kernel.org>, devicetree@vger.kernel.org, linux-arm-msm@vger.kernel.org, Stephen Boyd <swboyd@chromium.org>, Rob Herring <robh+dt@kernel.org>, dri-devel@lists.freedesktop.org, Douglas Anderson <dianders@chromium.org>, Robert Foss <robert.foss@linaro.org>, linux-kernel@vger.kernel.org, Boris Brezillon <boris.brezillon@collabora.com>, Thomas Zimmermann <tzimmermann@suse.de>, linux-i2c@vger.kernel.org Subject: [PATCH v4 00/27] drm: Fix EDID reading on ti-sn65dsi86; solve some chicken-and-egg problems Date: Fri, 16 Apr 2021 15:39:23 -0700 [thread overview] Message-ID: <20210416223950.3586967-1-dianders@chromium.org> (raw) The primary goal of this series is to try to properly fix EDID reading for eDP panels using the ti-sn65dsi86 bridge. Previously we had a patch that added EDID reading but it turned out not to work at bootup. This caused some extra churn at bootup as we tried (and failed) to read the EDID several times and also ended up forcing us to use the hardcoded mode at boot. With this patch series I believe EDID reading is reliable at boot now and we never use the hardcoded mode. This series is the logical successor to the 3-part series containing the patch ("drm/bridge: ti-sn65dsi86: Properly get the EDID, but only if refclk") [1] though only one actual patch is the same between the two. This series starts out with some general / obvious fixes and moves on to some more specific and maybe controversial ones. I wouldn't object to some of the earlier ones landing if they look ready. This patch was developed agains linuxnext (next-20210416) on a sc7180-trogdor-lazor device. To get things booting for me, I had to use Stephen's patch [2] to keep from crashing but otherwise all the patches I needed were here. Primary change between v2 and v3 is to stop doing the EDID caching in the core. I also added Andrzej's review tags. Between v3 and v4 this series grew a whole lot. I changed it so that the EDID reading is actually driven by the panel driver now as was suggested by Andrzej. While I still believe that the old approach wasn't too bad I'm still switching. Why? The main reason is that I think it's useful in general for the panel code to have access to the DDC bus and to be able to read the EDID. This may allow us to more easily have the panel code support multiple sources of panels--it can read the EDID and possibly adjust timings based on the model ID. It also allows the panel code (or perhaps backlight code?) to send DDC commands if they are need for a particular panel. At the moment, once the panel is provided the DDC bus then existing code will assume that it should be in charge of reading the EDID. While it doesn't have to work that way, it seems sane to build on what's already there. In order to expose the DDC bus to the panel, I had to solve a bunch of chicken-and-egg problems in terms of probe ordering between the bridge and the panel. I've broken the bridge driver into several sub drivers to make this happen. At the moment the sub-drivers are just there to solve the probe problem, but conceivably someone could use them to break the driver up in the future if need be. I apologize in advance for the length of this series. I'm currently working through getting commit access to drm-misc [3] so I can land the first several patches which are already reviewed. There are still a lot of patches even after the first few, but hopefully you can see that there are only so many because they're broken up into nice and reviewable bite-sized-chunks. :-) [1] https://lore.kernel.org/r/20210304155144.3.I60a7fb23ce4589006bc95c64ab8d15c74b876e68@changeid/ [2] https://lore.kernel.org/r/161706912161.3012082.17313817257247946143@swboyd.mtv.corp.google.com/ [3] https://gitlab.freedesktop.org/freedesktop/freedesktop/-/issues/348 Changes in v4: - Reword commit mesage slightly. Changes in v3: - Removed "NOTES" from commit message. Changes in v2: - Removed 2nd paragraph in commit message. Douglas Anderson (27): drm/bridge: Fix the stop condition of drm_bridge_chain_pre_enable() drm/bridge: ti-sn65dsi86: Simplify refclk handling drm/bridge: ti-sn65dsi86: Remove incorrectly tagged kerneldoc comment drm/bridge: ti-sn65dsi86: Reorder remove() drm/bridge: ti-sn65dsi86: Move drm_panel_unprepare() to post_disable() drm/bridge: ti-sn65dsi86: Get rid of the useless detect() function drm/panel: panel-simple: Use runtime pm to avoid excessive unprepare / prepare drm/bridge: ti-sn65dsi86: Rename the main driver data structure drm/bridge: ti-sn65dsi86: More renames in prep for sub-devices drm/bridge: ti-sn65dsi86: Clean debugfs code drm/bridge: ti-sn65dsi86: Add local var for "dev" to simplify probe drm/bridge: ti-sn65dsi86: Cleanup managing of drvdata drm/bridge: ti-sn65dsi86: Use devm to do our runtime_disable drm/bridge: ti-sn65dsi86: Move all the chip-related init to the start drm/bridge: ti-sn65dsi86: Break GPIO and MIPI-to-eDP bridge into sub-drivers drm/panel: panel-simple: Get rid of hacky HPD chicken-and-egg code drm/bridge: ti-sn65dsi86: Use pm_runtime autosuspend drm/bridge: ti-sn65dsi86: Code motion of refclk management functions drm/bridge: ti-sn65dsi86: If refclk, DP AUX can happen w/out pre-enable drm/bridge: ti-sn65dsi86: Promote the AUX channel to its own sub-dev i2c: i2c-core-of: Fix corner case of finding adapter by node drm/panel: panel-simple: Remove extra call: drm_connector_update_edid_property() drm/panel: panel-simple: Power the panel when reading the EDID drm/panel: panel-simple: Cache the EDID as long as we retain power drm/bridge: ti-sn65dsi86: Don't read EDID blob over DDC arm64: dts: qcom: Link the panel to the bridge's DDC bus drm/panel: panel-simple: Prepare/unprepare are refcounted, not forced arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi | 1 + drivers/gpu/drm/bridge/Kconfig | 1 + drivers/gpu/drm/bridge/ti-sn65dsi86.c | 748 ++++++++++++------- drivers/gpu/drm/drm_bridge.c | 3 + drivers/gpu/drm/panel/Kconfig | 1 + drivers/gpu/drm/panel/panel-simple.c | 123 +-- drivers/i2c/i2c-core-of.c | 17 +- 7 files changed, 555 insertions(+), 339 deletions(-) -- 2.31.1.368.gbe11c130af-goog _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel
next reply other threads:[~2021-04-16 22:40 UTC|newest] Thread overview: 102+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-04-16 22:39 Douglas Anderson [this message] 2021-04-16 22:39 ` [PATCH v4 00/27] drm: Fix EDID reading on ti-sn65dsi86; solve some chicken-and-egg problems Douglas Anderson 2021-04-16 22:39 ` [PATCH v4 01/27] drm/bridge: Fix the stop condition of drm_bridge_chain_pre_enable() Douglas Anderson 2021-04-16 22:39 ` Douglas Anderson 2021-04-16 22:39 ` [PATCH v4 02/27] drm/bridge: ti-sn65dsi86: Simplify refclk handling Douglas Anderson 2021-04-16 22:39 ` Douglas Anderson 2021-04-16 22:39 ` [PATCH v4 03/27] drm/bridge: ti-sn65dsi86: Remove incorrectly tagged kerneldoc comment Douglas Anderson 2021-04-16 22:39 ` Douglas Anderson 2021-04-16 22:39 ` [PATCH v4 04/27] drm/bridge: ti-sn65dsi86: Reorder remove() Douglas Anderson 2021-04-16 22:39 ` Douglas Anderson 2021-04-16 22:39 ` [PATCH v4 05/27] drm/bridge: ti-sn65dsi86: Move drm_panel_unprepare() to post_disable() Douglas Anderson 2021-04-16 22:39 ` Douglas Anderson 2021-04-16 22:39 ` [PATCH v4 06/27] drm/bridge: ti-sn65dsi86: Get rid of the useless detect() function Douglas Anderson 2021-04-16 22:39 ` Douglas Anderson 2021-04-16 22:39 ` [PATCH v4 07/27] drm/panel: panel-simple: Use runtime pm to avoid excessive unprepare / prepare Douglas Anderson 2021-04-16 22:39 ` Douglas Anderson 2021-04-16 22:39 ` [PATCH v4 08/27] drm/bridge: ti-sn65dsi86: Rename the main driver data structure Douglas Anderson 2021-04-16 22:39 ` Douglas Anderson 2021-04-23 14:28 ` Bjorn Andersson 2021-04-23 14:28 ` Bjorn Andersson 2021-04-16 22:39 ` [PATCH v4 09/27] drm/bridge: ti-sn65dsi86: More renames in prep for sub-devices Douglas Anderson 2021-04-16 22:39 ` Douglas Anderson 2021-04-23 14:30 ` Bjorn Andersson 2021-04-23 14:30 ` Bjorn Andersson 2021-04-16 22:39 ` [PATCH v4 10/27] drm/bridge: ti-sn65dsi86: Clean debugfs code Douglas Anderson 2021-04-16 22:39 ` Douglas Anderson 2021-04-23 14:35 ` Bjorn Andersson 2021-04-23 14:35 ` Bjorn Andersson 2021-04-16 22:39 ` [PATCH v4 11/27] drm/bridge: ti-sn65dsi86: Add local var for "dev" to simplify probe Douglas Anderson 2021-04-16 22:39 ` Douglas Anderson 2021-04-23 14:38 ` Bjorn Andersson 2021-04-23 14:38 ` Bjorn Andersson 2021-04-16 22:39 ` [PATCH v4 12/27] drm/bridge: ti-sn65dsi86: Cleanup managing of drvdata Douglas Anderson 2021-04-16 22:39 ` Douglas Anderson 2021-04-23 14:38 ` Bjorn Andersson 2021-04-23 14:38 ` Bjorn Andersson 2021-04-16 22:39 ` [PATCH v4 13/27] drm/bridge: ti-sn65dsi86: Use devm to do our runtime_disable Douglas Anderson 2021-04-16 22:39 ` Douglas Anderson 2021-04-23 14:39 ` Bjorn Andersson 2021-04-23 14:39 ` Bjorn Andersson 2021-04-16 22:39 ` [PATCH v4 14/27] drm/bridge: ti-sn65dsi86: Move all the chip-related init to the start Douglas Anderson 2021-04-16 22:39 ` Douglas Anderson 2021-04-23 14:41 ` Bjorn Andersson 2021-04-23 14:41 ` Bjorn Andersson 2021-04-16 22:39 ` [PATCH v4 15/27] drm/bridge: ti-sn65dsi86: Break GPIO and MIPI-to-eDP bridge into sub-drivers Douglas Anderson 2021-04-16 22:39 ` Douglas Anderson 2021-04-17 2:31 ` kernel test robot 2021-04-17 2:31 ` kernel test robot 2021-04-19 15:43 ` Doug Anderson 2021-04-19 15:43 ` Doug Anderson 2021-04-23 14:49 ` Bjorn Andersson 2021-04-23 14:49 ` Bjorn Andersson 2021-04-16 22:39 ` [PATCH v4 16/27] drm/panel: panel-simple: Get rid of hacky HPD chicken-and-egg code Douglas Anderson 2021-04-16 22:39 ` Douglas Anderson 2021-04-23 14:50 ` Bjorn Andersson 2021-04-23 14:50 ` Bjorn Andersson 2021-04-16 22:39 ` [PATCH v4 17/27] drm/bridge: ti-sn65dsi86: Use pm_runtime autosuspend Douglas Anderson 2021-04-16 22:39 ` Douglas Anderson 2021-04-23 14:51 ` Bjorn Andersson 2021-04-23 14:51 ` Bjorn Andersson 2021-04-16 22:39 ` [PATCH v4 18/27] drm/bridge: ti-sn65dsi86: Code motion of refclk management functions Douglas Anderson 2021-04-16 22:39 ` Douglas Anderson 2021-04-23 14:51 ` Bjorn Andersson 2021-04-23 14:51 ` Bjorn Andersson 2021-04-16 22:39 ` [PATCH v4 19/27] drm/bridge: ti-sn65dsi86: If refclk, DP AUX can happen w/out pre-enable Douglas Anderson 2021-04-16 22:39 ` Douglas Anderson 2021-04-23 14:56 ` Bjorn Andersson 2021-04-23 14:56 ` Bjorn Andersson 2021-04-16 22:39 ` [PATCH v4 20/27] drm/bridge: ti-sn65dsi86: Promote the AUX channel to its own sub-dev Douglas Anderson 2021-04-16 22:39 ` Douglas Anderson 2021-04-23 14:59 ` Bjorn Andersson 2021-04-23 14:59 ` Bjorn Andersson 2021-04-16 22:39 ` [PATCH v4 21/27] i2c: i2c-core-of: Fix corner case of finding adapter by node Douglas Anderson 2021-04-23 15:12 ` Bjorn Andersson 2021-04-16 22:39 ` [PATCH v4 22/27] drm/panel: panel-simple: Remove extra call: drm_connector_update_edid_property() Douglas Anderson 2021-04-16 22:39 ` Douglas Anderson 2021-04-23 15:15 ` Bjorn Andersson 2021-04-23 15:15 ` Bjorn Andersson 2021-04-16 22:39 ` [PATCH v4 23/27] drm/panel: panel-simple: Power the panel when reading the EDID Douglas Anderson 2021-04-16 22:39 ` Douglas Anderson 2021-04-23 15:16 ` Bjorn Andersson 2021-04-23 15:16 ` Bjorn Andersson 2021-04-16 22:39 ` [PATCH v4 24/27] drm/panel: panel-simple: Cache the EDID as long as we retain power Douglas Anderson 2021-04-16 22:39 ` Douglas Anderson 2021-04-23 16:12 ` Bjorn Andersson 2021-04-23 16:12 ` Bjorn Andersson 2021-04-23 16:30 ` Doug Anderson 2021-04-23 16:30 ` Doug Anderson 2021-04-16 22:39 ` [PATCH v4 25/27] drm/bridge: ti-sn65dsi86: Don't read EDID blob over DDC Douglas Anderson 2021-04-16 22:39 ` Douglas Anderson 2021-04-23 16:13 ` Bjorn Andersson 2021-04-23 16:13 ` Bjorn Andersson 2021-04-16 22:39 ` [PATCH v4 26/27] arm64: dts: qcom: Link the panel to the bridge's DDC bus Douglas Anderson 2021-04-23 16:16 ` Bjorn Andersson 2021-04-16 22:39 ` [PATCH v4 27/27] drm/panel: panel-simple: Prepare/unprepare are refcounted, not forced Douglas Anderson 2021-04-16 22:39 ` Douglas Anderson 2021-04-23 16:16 ` Bjorn Andersson 2021-04-23 16:16 ` Bjorn Andersson 2021-04-23 16:46 ` Doug Anderson 2021-04-23 16:46 ` Doug Anderson 2021-04-20 16:42 ` [PATCH v4 00/27] drm: Fix EDID reading on ti-sn65dsi86; solve some chicken-and-egg problems Doug Anderson 2021-04-20 16:42 ` Doug Anderson
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