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* [PATCH AUTOSEL 4.19 05/12] drm/sun4i: dw-hdmi: Make HDMI PHY into a platform device
       [not found] <20210615155009.62894-1-sashal@kernel.org>
@ 2021-06-15 15:50 ` Sasha Levin
  2021-06-15 16:34   ` Saravana Kannan
  0 siblings, 1 reply; 2+ messages in thread
From: Sasha Levin @ 2021-06-15 15:50 UTC (permalink / raw)
  To: linux-kernel, stable
  Cc: Saravana Kannan, Ondrej Jirman, Andre Przywara, Maxime Ripard,
	Sasha Levin, dri-devel, linux-arm-kernel, linux-sunxi

From: Saravana Kannan <saravanak@google.com>

[ Upstream commit 9bf3797796f570b34438235a6a537df85832bdad ]

On sunxi boards that use HDMI output, HDMI device probe keeps being
avoided indefinitely with these repeated messages in dmesg:

  platform 1ee0000.hdmi: probe deferral - supplier 1ef0000.hdmi-phy
    not ready

There's a fwnode_link being created with fw_devlink=on between hdmi
and hdmi-phy nodes, because both nodes have 'compatible' property set.

Fw_devlink code assumes that nodes that have compatible property
set will also have a device associated with them by some driver
eventually. This is not the case with the current sun8i-hdmi
driver.

This commit makes sun8i-hdmi-phy into a proper platform device
and fixes the display pipeline probe on sunxi boards that use HDMI.

More context: https://lkml.org/lkml/2021/5/16/203

Signed-off-by: Saravana Kannan <saravanak@google.com>
Signed-off-by: Ondrej Jirman <megous@megous.com>
Tested-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://patchwork.freedesktop.org/patch/msgid/20210607085836.2827429-1-megous@megous.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c  | 31 ++++++++++++++++---
 drivers/gpu/drm/sun4i/sun8i_dw_hdmi.h  |  5 ++--
 drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c | 41 ++++++++++++++++++++++----
 3 files changed, 66 insertions(+), 11 deletions(-)

diff --git a/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c b/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c
index 5073622cbb56..ab048f9412e7 100644
--- a/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c
+++ b/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c
@@ -144,7 +144,7 @@ static int sun8i_dw_hdmi_bind(struct device *dev, struct device *master,
 		goto err_disable_clk_tmds;
 	}
 
-	ret = sun8i_hdmi_phy_probe(hdmi, phy_node);
+	ret = sun8i_hdmi_phy_get(hdmi, phy_node);
 	of_node_put(phy_node);
 	if (ret) {
 		dev_err(dev, "Couldn't get the HDMI PHY\n");
@@ -179,7 +179,6 @@ static int sun8i_dw_hdmi_bind(struct device *dev, struct device *master,
 
 cleanup_encoder:
 	drm_encoder_cleanup(encoder);
-	sun8i_hdmi_phy_remove(hdmi);
 err_disable_clk_tmds:
 	clk_disable_unprepare(hdmi->clk_tmds);
 err_assert_ctrl_reset:
@@ -194,7 +193,6 @@ static void sun8i_dw_hdmi_unbind(struct device *dev, struct device *master,
 	struct sun8i_dw_hdmi *hdmi = dev_get_drvdata(dev);
 
 	dw_hdmi_unbind(hdmi->hdmi);
-	sun8i_hdmi_phy_remove(hdmi);
 	clk_disable_unprepare(hdmi->clk_tmds);
 	reset_control_assert(hdmi->rst_ctrl);
 }
@@ -230,7 +228,32 @@ static struct platform_driver sun8i_dw_hdmi_pltfm_driver = {
 		.of_match_table = sun8i_dw_hdmi_dt_ids,
 	},
 };
-module_platform_driver(sun8i_dw_hdmi_pltfm_driver);
+
+static int __init sun8i_dw_hdmi_init(void)
+{
+	int ret;
+
+	ret = platform_driver_register(&sun8i_dw_hdmi_pltfm_driver);
+	if (ret)
+		return ret;
+
+	ret = platform_driver_register(&sun8i_hdmi_phy_driver);
+	if (ret) {
+		platform_driver_unregister(&sun8i_dw_hdmi_pltfm_driver);
+		return ret;
+	}
+
+	return ret;
+}
+
+static void __exit sun8i_dw_hdmi_exit(void)
+{
+	platform_driver_unregister(&sun8i_dw_hdmi_pltfm_driver);
+	platform_driver_unregister(&sun8i_hdmi_phy_driver);
+}
+
+module_init(sun8i_dw_hdmi_init);
+module_exit(sun8i_dw_hdmi_exit);
 
 MODULE_AUTHOR("Jernej Skrabec <jernej.skrabec@siol.net>");
 MODULE_DESCRIPTION("Allwinner DW HDMI bridge");
diff --git a/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.h b/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.h
index aadbe0a10b0c..41355bf3aca8 100644
--- a/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.h
+++ b/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.h
@@ -179,14 +179,15 @@ struct sun8i_dw_hdmi {
 	struct reset_control		*rst_ctrl;
 };
 
+extern struct platform_driver sun8i_hdmi_phy_driver;
+
 static inline struct sun8i_dw_hdmi *
 encoder_to_sun8i_dw_hdmi(struct drm_encoder *encoder)
 {
 	return container_of(encoder, struct sun8i_dw_hdmi, encoder);
 }
 
-int sun8i_hdmi_phy_probe(struct sun8i_dw_hdmi *hdmi, struct device_node *node);
-void sun8i_hdmi_phy_remove(struct sun8i_dw_hdmi *hdmi);
+int sun8i_hdmi_phy_get(struct sun8i_dw_hdmi *hdmi, struct device_node *node);
 
 void sun8i_hdmi_phy_init(struct sun8i_hdmi_phy *phy);
 const struct dw_hdmi_phy_ops *sun8i_hdmi_phy_get_ops(void);
diff --git a/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c b/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c
index dc9b1398adb9..7e7a81f9d29a 100644
--- a/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c
+++ b/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c
@@ -5,6 +5,7 @@
 
 #include <linux/delay.h>
 #include <linux/of_address.h>
+#include <linux/of_platform.h>
 
 #include "sun8i_dw_hdmi.h"
 
@@ -433,10 +434,30 @@ static const struct of_device_id sun8i_hdmi_phy_of_table[] = {
 	{ /* sentinel */ }
 };
 
-int sun8i_hdmi_phy_probe(struct sun8i_dw_hdmi *hdmi, struct device_node *node)
+int sun8i_hdmi_phy_get(struct sun8i_dw_hdmi *hdmi, struct device_node *node)
+{
+	struct platform_device *pdev = of_find_device_by_node(node);
+	struct sun8i_hdmi_phy *phy;
+
+	if (!pdev)
+		return -EPROBE_DEFER;
+
+	phy = platform_get_drvdata(pdev);
+	if (!phy)
+		return -EPROBE_DEFER;
+
+	hdmi->phy = phy;
+
+	put_device(&pdev->dev);
+
+	return 0;
+}
+
+static int sun8i_hdmi_phy_probe(struct platform_device *pdev)
 {
 	const struct of_device_id *match;
-	struct device *dev = hdmi->dev;
+	struct device *dev = &pdev->dev;
+	struct device_node *node = dev->of_node;
 	struct sun8i_hdmi_phy *phy;
 	struct resource res;
 	void __iomem *regs;
@@ -540,7 +561,7 @@ int sun8i_hdmi_phy_probe(struct sun8i_dw_hdmi *hdmi, struct device_node *node)
 		clk_prepare_enable(phy->clk_phy);
 	}
 
-	hdmi->phy = phy;
+	platform_set_drvdata(pdev, phy);
 
 	return 0;
 
@@ -564,9 +585,9 @@ int sun8i_hdmi_phy_probe(struct sun8i_dw_hdmi *hdmi, struct device_node *node)
 	return ret;
 }
 
-void sun8i_hdmi_phy_remove(struct sun8i_dw_hdmi *hdmi)
+static int sun8i_hdmi_phy_remove(struct platform_device *pdev)
 {
-	struct sun8i_hdmi_phy *phy = hdmi->phy;
+	struct sun8i_hdmi_phy *phy = platform_get_drvdata(pdev);
 
 	clk_disable_unprepare(phy->clk_mod);
 	clk_disable_unprepare(phy->clk_bus);
@@ -580,4 +601,14 @@ void sun8i_hdmi_phy_remove(struct sun8i_dw_hdmi *hdmi)
 	clk_put(phy->clk_pll1);
 	clk_put(phy->clk_mod);
 	clk_put(phy->clk_bus);
+	return 0;
 }
+
+struct platform_driver sun8i_hdmi_phy_driver = {
+	.probe  = sun8i_hdmi_phy_probe,
+	.remove = sun8i_hdmi_phy_remove,
+	.driver = {
+		.name = "sun8i-hdmi-phy",
+		.of_match_table = sun8i_hdmi_phy_of_table,
+	},
+};
-- 
2.30.2


^ permalink raw reply related	[flat|nested] 2+ messages in thread
* Re: [PATCH AUTOSEL 4.19 05/12] drm/sun4i: dw-hdmi: Make HDMI PHY into a platform device
  2021-06-15 15:50 ` [PATCH AUTOSEL 4.19 05/12] drm/sun4i: dw-hdmi: Make HDMI PHY into a platform device Sasha Levin
@ 2021-06-15 16:34   ` Saravana Kannan
  0 siblings, 0 replies; 2+ messages in thread
From: Saravana Kannan @ 2021-06-15 16:34 UTC (permalink / raw)
  To: Sasha Levin
  Cc: LKML, stable, Ondrej Jirman, Andre Przywara, Maxime Ripard,
	dri-devel, linux-arm-kernel,
	open list:ARM/Allwinner sunXi SoC support

On Tue, Jun 15, 2021 at 8:50 AM Sasha Levin <sashal@kernel.org> wrote:
>
> From: Saravana Kannan <saravanak@google.com>
>
> [ Upstream commit 9bf3797796f570b34438235a6a537df85832bdad ]
>
> On sunxi boards that use HDMI output, HDMI device probe keeps being
> avoided indefinitely with these repeated messages in dmesg:
>
>   platform 1ee0000.hdmi: probe deferral - supplier 1ef0000.hdmi-phy
>     not ready
>
> There's a fwnode_link being created with fw_devlink=on between hdmi
> and hdmi-phy nodes, because both nodes have 'compatible' property set.
>
> Fw_devlink code assumes that nodes that have compatible property
> set will also have a device associated with them by some driver
> eventually. This is not the case with the current sun8i-hdmi
> driver.

Not needed. fw_devlink isn't present in 4.19.

-Saravana

>
> This commit makes sun8i-hdmi-phy into a proper platform device
> and fixes the display pipeline probe on sunxi boards that use HDMI.
>
> More context: https://lkml.org/lkml/2021/5/16/203
>
> Signed-off-by: Saravana Kannan <saravanak@google.com>
> Signed-off-by: Ondrej Jirman <megous@megous.com>
> Tested-by: Andre Przywara <andre.przywara@arm.com>
> Signed-off-by: Maxime Ripard <maxime@cerno.tech>
> Link: https://patchwork.freedesktop.org/patch/msgid/20210607085836.2827429-1-megous@megous.com
> Signed-off-by: Sasha Levin <sashal@kernel.org>
> ---
>  drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c  | 31 ++++++++++++++++---
>  drivers/gpu/drm/sun4i/sun8i_dw_hdmi.h  |  5 ++--
>  drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c | 41 ++++++++++++++++++++++----
>  3 files changed, 66 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c b/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c
> index 5073622cbb56..ab048f9412e7 100644
> --- a/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c
> +++ b/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c
> @@ -144,7 +144,7 @@ static int sun8i_dw_hdmi_bind(struct device *dev, struct device *master,
>                 goto err_disable_clk_tmds;
>         }
>
> -       ret = sun8i_hdmi_phy_probe(hdmi, phy_node);
> +       ret = sun8i_hdmi_phy_get(hdmi, phy_node);
>         of_node_put(phy_node);
>         if (ret) {
>                 dev_err(dev, "Couldn't get the HDMI PHY\n");
> @@ -179,7 +179,6 @@ static int sun8i_dw_hdmi_bind(struct device *dev, struct device *master,
>
>  cleanup_encoder:
>         drm_encoder_cleanup(encoder);
> -       sun8i_hdmi_phy_remove(hdmi);
>  err_disable_clk_tmds:
>         clk_disable_unprepare(hdmi->clk_tmds);
>  err_assert_ctrl_reset:
> @@ -194,7 +193,6 @@ static void sun8i_dw_hdmi_unbind(struct device *dev, struct device *master,
>         struct sun8i_dw_hdmi *hdmi = dev_get_drvdata(dev);
>
>         dw_hdmi_unbind(hdmi->hdmi);
> -       sun8i_hdmi_phy_remove(hdmi);
>         clk_disable_unprepare(hdmi->clk_tmds);
>         reset_control_assert(hdmi->rst_ctrl);
>  }
> @@ -230,7 +228,32 @@ static struct platform_driver sun8i_dw_hdmi_pltfm_driver = {
>                 .of_match_table = sun8i_dw_hdmi_dt_ids,
>         },
>  };
> -module_platform_driver(sun8i_dw_hdmi_pltfm_driver);
> +
> +static int __init sun8i_dw_hdmi_init(void)
> +{
> +       int ret;
> +
> +       ret = platform_driver_register(&sun8i_dw_hdmi_pltfm_driver);
> +       if (ret)
> +               return ret;
> +
> +       ret = platform_driver_register(&sun8i_hdmi_phy_driver);
> +       if (ret) {
> +               platform_driver_unregister(&sun8i_dw_hdmi_pltfm_driver);
> +               return ret;
> +       }
> +
> +       return ret;
> +}
> +
> +static void __exit sun8i_dw_hdmi_exit(void)
> +{
> +       platform_driver_unregister(&sun8i_dw_hdmi_pltfm_driver);
> +       platform_driver_unregister(&sun8i_hdmi_phy_driver);
> +}
> +
> +module_init(sun8i_dw_hdmi_init);
> +module_exit(sun8i_dw_hdmi_exit);
>
>  MODULE_AUTHOR("Jernej Skrabec <jernej.skrabec@siol.net>");
>  MODULE_DESCRIPTION("Allwinner DW HDMI bridge");
> diff --git a/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.h b/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.h
> index aadbe0a10b0c..41355bf3aca8 100644
> --- a/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.h
> +++ b/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.h
> @@ -179,14 +179,15 @@ struct sun8i_dw_hdmi {
>         struct reset_control            *rst_ctrl;
>  };
>
> +extern struct platform_driver sun8i_hdmi_phy_driver;
> +
>  static inline struct sun8i_dw_hdmi *
>  encoder_to_sun8i_dw_hdmi(struct drm_encoder *encoder)
>  {
>         return container_of(encoder, struct sun8i_dw_hdmi, encoder);
>  }
>
> -int sun8i_hdmi_phy_probe(struct sun8i_dw_hdmi *hdmi, struct device_node *node);
> -void sun8i_hdmi_phy_remove(struct sun8i_dw_hdmi *hdmi);
> +int sun8i_hdmi_phy_get(struct sun8i_dw_hdmi *hdmi, struct device_node *node);
>
>  void sun8i_hdmi_phy_init(struct sun8i_hdmi_phy *phy);
>  const struct dw_hdmi_phy_ops *sun8i_hdmi_phy_get_ops(void);
> diff --git a/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c b/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c
> index dc9b1398adb9..7e7a81f9d29a 100644
> --- a/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c
> +++ b/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c
> @@ -5,6 +5,7 @@
>
>  #include <linux/delay.h>
>  #include <linux/of_address.h>
> +#include <linux/of_platform.h>
>
>  #include "sun8i_dw_hdmi.h"
>
> @@ -433,10 +434,30 @@ static const struct of_device_id sun8i_hdmi_phy_of_table[] = {
>         { /* sentinel */ }
>  };
>
> -int sun8i_hdmi_phy_probe(struct sun8i_dw_hdmi *hdmi, struct device_node *node)
> +int sun8i_hdmi_phy_get(struct sun8i_dw_hdmi *hdmi, struct device_node *node)
> +{
> +       struct platform_device *pdev = of_find_device_by_node(node);
> +       struct sun8i_hdmi_phy *phy;
> +
> +       if (!pdev)
> +               return -EPROBE_DEFER;
> +
> +       phy = platform_get_drvdata(pdev);
> +       if (!phy)
> +               return -EPROBE_DEFER;
> +
> +       hdmi->phy = phy;
> +
> +       put_device(&pdev->dev);
> +
> +       return 0;
> +}
> +
> +static int sun8i_hdmi_phy_probe(struct platform_device *pdev)
>  {
>         const struct of_device_id *match;
> -       struct device *dev = hdmi->dev;
> +       struct device *dev = &pdev->dev;
> +       struct device_node *node = dev->of_node;
>         struct sun8i_hdmi_phy *phy;
>         struct resource res;
>         void __iomem *regs;
> @@ -540,7 +561,7 @@ int sun8i_hdmi_phy_probe(struct sun8i_dw_hdmi *hdmi, struct device_node *node)
>                 clk_prepare_enable(phy->clk_phy);
>         }
>
> -       hdmi->phy = phy;
> +       platform_set_drvdata(pdev, phy);
>
>         return 0;
>
> @@ -564,9 +585,9 @@ int sun8i_hdmi_phy_probe(struct sun8i_dw_hdmi *hdmi, struct device_node *node)
>         return ret;
>  }
>
> -void sun8i_hdmi_phy_remove(struct sun8i_dw_hdmi *hdmi)
> +static int sun8i_hdmi_phy_remove(struct platform_device *pdev)
>  {
> -       struct sun8i_hdmi_phy *phy = hdmi->phy;
> +       struct sun8i_hdmi_phy *phy = platform_get_drvdata(pdev);
>
>         clk_disable_unprepare(phy->clk_mod);
>         clk_disable_unprepare(phy->clk_bus);
> @@ -580,4 +601,14 @@ void sun8i_hdmi_phy_remove(struct sun8i_dw_hdmi *hdmi)
>         clk_put(phy->clk_pll1);
>         clk_put(phy->clk_mod);
>         clk_put(phy->clk_bus);
> +       return 0;
>  }
> +
> +struct platform_driver sun8i_hdmi_phy_driver = {
> +       .probe  = sun8i_hdmi_phy_probe,
> +       .remove = sun8i_hdmi_phy_remove,
> +       .driver = {
> +               .name = "sun8i-hdmi-phy",
> +               .of_match_table = sun8i_hdmi_phy_of_table,
> +       },
> +};
> --
> 2.30.2
>

^ permalink raw reply	[flat|nested] 2+ messages in thread
end of thread, other threads:[~2021-06-15 16:35 UTC | newest]

Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
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2021-06-15 15:50 ` [PATCH AUTOSEL 4.19 05/12] drm/sun4i: dw-hdmi: Make HDMI PHY into a platform device Sasha Levin
2021-06-15 16:34   ` Saravana Kannan

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