Re: [PATCH v8 06/11] drm/panel: panel-simple: Allow panel-simple be a DP AUX endpoint device

Re: [PATCH v8 06/11] drm/panel: panel-simple: Allow panel-simple be a DP AUX endpoint device

[kernel test robot]

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CC: kbuild-all(a)lists.01.org
CC: clang-built-linux(a)googlegroups.com
In-Reply-To: <20210524165920.v8.6.Iada41f76a7342354bae929d0bb3ceba40f27f0ea@changeid>
References: <20210524165920.v8.6.Iada41f76a7342354bae929d0bb3ceba40f27f0ea(a)changeid>
TO: Douglas Anderson <dianders@chromium.org>
TO: Andrzej Hajda <a.hajda@samsung.com>
TO: Neil Armstrong <narmstrong@baylibre.com>
TO: Laurent Pinchart <Laurent.pinchart@ideasonboard.com>
TO: Jonas Karlman <jonas@kwiboo.se>
TO: Sam Ravnborg <sam@ravnborg.org>
CC: robdclark(a)chromium.org
CC: David Airlie <airlied@linux.ie>
CC: linux-arm-msm(a)vger.kernel.org
CC: Douglas Anderson <dianders@chromium.org>
CC: Steev Klimaszewski <steev@kali.org>

Hi Douglas,

I love your patch! Perhaps something to improve:

[auto build test WARNING on next-20210524]
[also build test WARNING on v5.13-rc3]
[cannot apply to robh/for-next pinctrl/devel linus/master v5.13-rc3 v5.13-rc2 v5.13-rc1]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Douglas-Anderson/drm-Fix-EDID-reading-on-ti-sn65dsi86-by-introducing-the-DP-AUX-bus/20210525-080505
base:    674dc447b09fb668976c6ab1356b11e02ff209ed
:::::: branch date: 4 hours ago
:::::: commit date: 4 hours ago
config: x86_64-randconfig-b001-20210524 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 99155e913e9bad5f7f8a247f8bb3a3ff3da74af1)

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>


iwyu warnings: (new ones prefixed by >>)
>> drivers/gpu/drm/drm_dp_aux_bus.c:16:1: iwyu: warning: superfluous #include <linux/kernel.h>
>> drivers/gpu/drm/drm_dp_aux_bus.c:20:1: iwyu: warning: superfluous #include <linux/pm_runtime.h>

vim +16 drivers/gpu/drm/drm_dp_aux_bus.c

c51d94bc90f7b2 Douglas Anderson 2021-05-24 @16  #include <linux/kernel.h>
c51d94bc90f7b2 Douglas Anderson 2021-05-24  17  #include <linux/module.h>
c51d94bc90f7b2 Douglas Anderson 2021-05-24  18  #include <linux/of_device.h>
c51d94bc90f7b2 Douglas Anderson 2021-05-24  19  #include <linux/pm_domain.h>
c51d94bc90f7b2 Douglas Anderson 2021-05-24 @20  #include <linux/pm_runtime.h>
c51d94bc90f7b2 Douglas Anderson 2021-05-24  21  

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org

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[PATCH v8 06/11] drm/panel: panel-simple: Allow panel-simple be a DP AUX endpoint device

[Douglas Anderson]

The panel-simple driver can already have devices instantiated as
platform devices or MIPI DSI devices. Let's add a 3rd way to
instantiate it: as DP AUX endpoint devices.

At the moment there is no benefit to instantiating it in this way,
but:
- In the next patch we'll give it access to the DDC channel via the DP
  AUX bus.
- Possibly in the future we may use this channel to configure the
  backlight.

Signed-off-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Lyude Paul <lyude@redhat.com>
---

(no changes since v7)

Changes in v7:
- Patch to allow panel-simple to be DP AUX EP new for v7.

 drivers/gpu/drm/panel/Kconfig        |  1 +
 drivers/gpu/drm/panel/panel-simple.c | 52 +++++++++++++++++++++++++---
 2 files changed, 49 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index ef87d92cdf49..b1ea86d9fdaf 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -82,6 +82,7 @@ config DRM_PANEL_SIMPLE
 	depends on BACKLIGHT_CLASS_DEVICE
 	depends on PM
 	select VIDEOMODE_HELPERS
+	select DRM_DP_AUX_BUS
 	help
 	  DRM panel driver for dumb panels that need at most a regulator and
 	  a GPIO to be powered up. Optionally a backlight can be attached so
diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
index 21939d4352cf..d3b5ae22d939 100644
--- a/drivers/gpu/drm/panel/panel-simple.c
+++ b/drivers/gpu/drm/panel/panel-simple.c
@@ -36,6 +36,7 @@
 
 #include <drm/drm_crtc.h>
 #include <drm/drm_device.h>
+#include <drm/drm_dp_aux_bus.h>
 #include <drm/drm_mipi_dsi.h>
 #include <drm/drm_panel.h>
 
@@ -4957,6 +4958,38 @@ static struct mipi_dsi_driver panel_simple_dsi_driver = {
 	.shutdown = panel_simple_dsi_shutdown,
 };
 
+static int panel_simple_dp_aux_ep_probe(struct dp_aux_ep_device *aux_ep)
+{
+	const struct of_device_id *id;
+
+	id = of_match_node(platform_of_match, aux_ep->dev.of_node);
+	if (!id)
+		return -ENODEV;
+
+	return panel_simple_probe(&aux_ep->dev, id->data);
+}
+
+static void panel_simple_dp_aux_ep_remove(struct dp_aux_ep_device *aux_ep)
+{
+	panel_simple_remove(&aux_ep->dev);
+}
+
+static void panel_simple_dp_aux_ep_shutdown(struct dp_aux_ep_device *aux_ep)
+{
+	panel_simple_shutdown(&aux_ep->dev);
+}
+
+static struct dp_aux_ep_driver panel_simple_dp_aux_ep_driver = {
+	.driver = {
+		.name = "panel-simple-dp-aux",
+		.of_match_table = platform_of_match,	/* Same as platform one! */
+		.pm = &panel_simple_pm_ops,
+	},
+	.probe = panel_simple_dp_aux_ep_probe,
+	.remove = panel_simple_dp_aux_ep_remove,
+	.shutdown = panel_simple_dp_aux_ep_shutdown,
+};
+
 static int __init panel_simple_init(void)
 {
 	int err;
@@ -4965,15 +4998,25 @@ static int __init panel_simple_init(void)
 	if (err < 0)
 		return err;
 
+	err = dp_aux_dp_driver_register(&panel_simple_dp_aux_ep_driver);
+	if (err < 0)
+		goto err_did_platform_register;
+
 	if (IS_ENABLED(CONFIG_DRM_MIPI_DSI)) {
 		err = mipi_dsi_driver_register(&panel_simple_dsi_driver);
-		if (err < 0) {
-			platform_driver_unregister(&panel_simple_platform_driver);
-			return err;
-		}
+		if (err < 0)
+			goto err_did_aux_ep_register;
 	}
 
 	return 0;
+
+err_did_aux_ep_register:
+	dp_aux_dp_driver_unregister(&panel_simple_dp_aux_ep_driver);
+
+err_did_platform_register:
+	platform_driver_unregister(&panel_simple_platform_driver);
+
+	return err;
 }
 module_init(panel_simple_init);
 
@@ -4982,6 +5025,7 @@ static void __exit panel_simple_exit(void)
 	if (IS_ENABLED(CONFIG_DRM_MIPI_DSI))
 		mipi_dsi_driver_unregister(&panel_simple_dsi_driver);
 
+	dp_aux_dp_driver_unregister(&panel_simple_dp_aux_ep_driver);
 	platform_driver_unregister(&panel_simple_platform_driver);
 }
 module_exit(panel_simple_exit);
-- 
2.31.1.818.g46aad6cb9e-goog

[PATCH v8 06/11] drm/panel: panel-simple: Allow panel-simple be a DP AUX endpoint device

[Douglas Anderson]

The panel-simple driver can already have devices instantiated as
platform devices or MIPI DSI devices. Let's add a 3rd way to
instantiate it: as DP AUX endpoint devices.

At the moment there is no benefit to instantiating it in this way,
but:
- In the next patch we'll give it access to the DDC channel via the DP
  AUX bus.
- Possibly in the future we may use this channel to configure the
  backlight.

Signed-off-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Lyude Paul <lyude@redhat.com>
---

(no changes since v7)

Changes in v7:
- Patch to allow panel-simple to be DP AUX EP new for v7.

 drivers/gpu/drm/panel/Kconfig        |  1 +
 drivers/gpu/drm/panel/panel-simple.c | 52 +++++++++++++++++++++++++---
 2 files changed, 49 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index ef87d92cdf49..b1ea86d9fdaf 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -82,6 +82,7 @@ config DRM_PANEL_SIMPLE
 	depends on BACKLIGHT_CLASS_DEVICE
 	depends on PM
 	select VIDEOMODE_HELPERS
+	select DRM_DP_AUX_BUS
 	help
 	  DRM panel driver for dumb panels that need at most a regulator and
 	  a GPIO to be powered up. Optionally a backlight can be attached so
diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
index 21939d4352cf..d3b5ae22d939 100644
--- a/drivers/gpu/drm/panel/panel-simple.c
+++ b/drivers/gpu/drm/panel/panel-simple.c
@@ -36,6 +36,7 @@
 
 #include <drm/drm_crtc.h>
 #include <drm/drm_device.h>
+#include <drm/drm_dp_aux_bus.h>
 #include <drm/drm_mipi_dsi.h>
 #include <drm/drm_panel.h>
 
@@ -4957,6 +4958,38 @@ static struct mipi_dsi_driver panel_simple_dsi_driver = {
 	.shutdown = panel_simple_dsi_shutdown,
 };
 
+static int panel_simple_dp_aux_ep_probe(struct dp_aux_ep_device *aux_ep)
+{
+	const struct of_device_id *id;
+
+	id = of_match_node(platform_of_match, aux_ep->dev.of_node);
+	if (!id)
+		return -ENODEV;
+
+	return panel_simple_probe(&aux_ep->dev, id->data);
+}
+
+static void panel_simple_dp_aux_ep_remove(struct dp_aux_ep_device *aux_ep)
+{
+	panel_simple_remove(&aux_ep->dev);
+}
+
+static void panel_simple_dp_aux_ep_shutdown(struct dp_aux_ep_device *aux_ep)
+{
+	panel_simple_shutdown(&aux_ep->dev);
+}
+
+static struct dp_aux_ep_driver panel_simple_dp_aux_ep_driver = {
+	.driver = {
+		.name = "panel-simple-dp-aux",
+		.of_match_table = platform_of_match,	/* Same as platform one! */
+		.pm = &panel_simple_pm_ops,
+	},
+	.probe = panel_simple_dp_aux_ep_probe,
+	.remove = panel_simple_dp_aux_ep_remove,
+	.shutdown = panel_simple_dp_aux_ep_shutdown,
+};
+
 static int __init panel_simple_init(void)
 {
 	int err;
@@ -4965,15 +4998,25 @@ static int __init panel_simple_init(void)
 	if (err < 0)
 		return err;
 
+	err = dp_aux_dp_driver_register(&panel_simple_dp_aux_ep_driver);
+	if (err < 0)
+		goto err_did_platform_register;
+
 	if (IS_ENABLED(CONFIG_DRM_MIPI_DSI)) {
 		err = mipi_dsi_driver_register(&panel_simple_dsi_driver);
-		if (err < 0) {
-			platform_driver_unregister(&panel_simple_platform_driver);
-			return err;
-		}
+		if (err < 0)
+			goto err_did_aux_ep_register;
 	}
 
 	return 0;
+
+err_did_aux_ep_register:
+	dp_aux_dp_driver_unregister(&panel_simple_dp_aux_ep_driver);
+
+err_did_platform_register:
+	platform_driver_unregister(&panel_simple_platform_driver);
+
+	return err;
 }
 module_init(panel_simple_init);
 
@@ -4982,6 +5025,7 @@ static void __exit panel_simple_exit(void)
 	if (IS_ENABLED(CONFIG_DRM_MIPI_DSI))
 		mipi_dsi_driver_unregister(&panel_simple_dsi_driver);
 
+	dp_aux_dp_driver_unregister(&panel_simple_dp_aux_ep_driver);
 	platform_driver_unregister(&panel_simple_platform_driver);
 }
 module_exit(panel_simple_exit);
-- 
2.31.1.818.g46aad6cb9e-goog