[PATCH 0/3] Finish Armada DRM DT support

[PATCH 0/3] Finish Armada DRM DT support

[Russell King - ARM Linux]

Finish Armada DRM support for DT, finally allowing mainline kernels to
use this driver unimpeded.

 arch/arm/boot/dts/dove-cubox.dts     | 43 +++++++++++++++++++++++++++++++
 drivers/gpu/drm/armada/Makefile      |  3 +++
 drivers/gpu/drm/armada/armada_drv.c  | 29 ++++++++++++++++++---
 drivers/gpu/drm/armada/armada_rmem.c | 49 ++++++++++++++++++++++++++++++++++++
 4 files changed, 121 insertions(+), 3 deletions(-)

-- 
RMK's Patch system: http://www.armlinux.org.uk/developer/patches/
FTTC broadband for 0.8mile line in suburbia: sync at 13.8Mbps down 630kbps up
According to speedtest.net: 13Mbps down 490kbps up

[PATCH 1/3] drm/armada: fix compare_of() for LCD controllers

[Russell King]

The DT node passed for LCD controllers is the "port" node within the
parent device.  Detect this and compare the parent node.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
---
 drivers/gpu/drm/armada/armada_drv.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/armada/armada_drv.c b/drivers/gpu/drm/armada/armada_drv.c
index d1705d298a39..217f0590fd61 100644
--- a/drivers/gpu/drm/armada/armada_drv.c
+++ b/drivers/gpu/drm/armada/armada_drv.c
@@ -205,7 +205,10 @@ static void armada_drm_unbind(struct device *dev)
 
 static int compare_of(struct device *dev, void *data)
 {
-	return dev->of_node == data;
+	struct device_node *np = data;
+	if (of_node_cmp(np->name, "port") == 0)
+		np = np->parent;
+	return dev->of_node == np;
 }
 
 static int compare_dev_name(struct device *dev, void *data)
-- 
2.7.4

[PATCH 2/3] drm/armada: add OF reserved memory support

[Russell King]

Existing Armada DRM makes use of reserved memory for allocating
contiguous screen buffers, which currently prevents its use with
DT systems.  Add support for this for DT systems.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
---
 drivers/gpu/drm/armada/Makefile      |  3 +++
 drivers/gpu/drm/armada/armada_drv.c  | 24 ++++++++++++++++--
 drivers/gpu/drm/armada/armada_rmem.c | 49 ++++++++++++++++++++++++++++++++++++
 3 files changed, 74 insertions(+), 2 deletions(-)
 create mode 100644 drivers/gpu/drm/armada/armada_rmem.c

diff --git a/drivers/gpu/drm/armada/Makefile b/drivers/gpu/drm/armada/Makefile
index ecf25cf9f9f5..0b8bf3b8aa6a 100644
--- a/drivers/gpu/drm/armada/Makefile
+++ b/drivers/gpu/drm/armada/Makefile
@@ -5,3 +5,6 @@ armada-y	+= armada_510.o
 armada-$(CONFIG_DEBUG_FS) += armada_debugfs.o
 
 obj-$(CONFIG_DRM_ARMADA) := armada.o
+
+armada-rmem-$(CONFIG_DRM_ARMADA) += armada_rmem.o
+obj-y += $(armada-rmem-y) $(armada-rmem-m)
diff --git a/drivers/gpu/drm/armada/armada_drv.c b/drivers/gpu/drm/armada/armada_drv.c
index 217f0590fd61..a9ee492a2810 100644
--- a/drivers/gpu/drm/armada/armada_drv.c
+++ b/drivers/gpu/drm/armada/armada_drv.c
@@ -9,6 +9,7 @@
 #include <linux/component.h>
 #include <linux/module.h>
 #include <linux/of_graph.h>
+#include <linux/of_reserved_mem.h>
 #include <drm/drm_crtc_helper.h>
 #include <drm/drm_fb_helper.h>
 #include <drm/drm_of.h>
@@ -96,6 +97,9 @@ static int armada_drm_bind(struct device *dev)
 			return -EINVAL;
 	}
 
+	if (!mem && dev->of_node)
+		mem = dev->platform_data;
+
 	if (!mem)
 		return -ENXIO;
 
@@ -250,9 +254,17 @@ static int armada_drm_probe(struct platform_device *pdev)
 	struct device *dev = &pdev->dev;
 	int ret;
 
-	ret = drm_of_component_probe(dev, compare_dev_name, &armada_master_ops);
-	if (ret != -EINVAL)
+	if (dev->of_node) {
+		ret = of_reserved_mem_device_init(dev);
+		if (ret && ret != -ENODEV)
+			return ret;
+
+		ret = drm_of_component_probe(dev, compare_of,
+					     &armada_master_ops);
+		if (ret)
+			of_reserved_mem_device_release(dev);
 		return ret;
+	}
 
 	if (dev->platform_data) {
 		char **devices = dev->platform_data;
@@ -287,6 +299,7 @@ static int armada_drm_probe(struct platform_device *pdev)
 static int armada_drm_remove(struct platform_device *pdev)
 {
 	component_master_del(&pdev->dev, &armada_master_ops);
+	of_reserved_mem_device_release(&pdev->dev);
 	return 0;
 }
 
@@ -300,11 +313,18 @@ static const struct platform_device_id armada_drm_platform_ids[] = {
 };
 MODULE_DEVICE_TABLE(platform, armada_drm_platform_ids);
 
+static const struct of_device_id armada_drm_dt_ids[] = {
+	{ .compatible = "marvell,dove-display-subsystem", },
+	{ /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, armada_drm_dt_ids);
+
 static struct platform_driver armada_drm_platform_driver = {
 	.probe	= armada_drm_probe,
 	.remove	= armada_drm_remove,
 	.driver	= {
 		.name	= "armada-drm",
+		.of_match_table = armada_drm_dt_ids,
 	},
 	.id_table = armada_drm_platform_ids,
 };
diff --git a/drivers/gpu/drm/armada/armada_rmem.c b/drivers/gpu/drm/armada/armada_rmem.c
new file mode 100644
index 000000000000..36bb20e426b6
--- /dev/null
+++ b/drivers/gpu/drm/armada/armada_rmem.c
@@ -0,0 +1,49 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2017 Russell King
+#include <linux/errno.h>
+#include <linux/of.h>
+#include <linux/of_reserved_mem.h>
+#include <linux/slab.h>
+
+static int armada_rmem_dev_init(struct reserved_mem *rmem, struct device *dev)
+{
+	struct resource *r;
+
+	if (dev->platform_data)
+		return -EBUSY;
+
+	r = kzalloc(sizeof(*r), GFP_KERNEL);
+	if (!r)
+		return -ENOMEM;
+
+	r->start = rmem->base;
+	r->end = rmem->base + rmem->size - 1;
+	r->flags = IORESOURCE_MEM;
+
+	rmem->priv = r;
+	dev->platform_data = r;
+
+	return 0;
+}
+
+static void armada_rmem_dev_release(struct reserved_mem *rmem,
+	struct device *dev)
+{
+	kfree(rmem->priv);
+	rmem->priv = NULL;
+	dev->platform_data = NULL;
+}
+
+static const struct reserved_mem_ops armada_rmem_ops = {
+	.device_init = armada_rmem_dev_init,
+	.device_release = armada_rmem_dev_release,
+};
+
+static int __init armada_rmem_init(struct reserved_mem *rmem)
+{
+	rmem->ops = &armada_rmem_ops;
+	return 0;
+}
+
+RESERVEDMEM_OF_DECLARE(armada_rmem, "marvell,dove-framebuffer",
+			armada_rmem_init);
-- 
2.7.4

[PATCH 3/3] ARM: dts: cubox: add LCD controller and TDA998x configuration

[Russell King]

Add DT configuration for the HDMI display output on the Dove Cubox.
This adds support for the LCD0 controller which is connected to a
TDA19988 HDMI encoder.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---
 arch/arm/boot/dts/dove-cubox.dts | 43 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/arch/arm/boot/dts/dove-cubox.dts b/arch/arm/boot/dts/dove-cubox.dts
index 580e3cbcfbf7..f6dd56f63d09 100644
--- a/arch/arm/boot/dts/dove-cubox.dts
+++ b/arch/arm/boot/dts/dove-cubox.dts
@@ -67,6 +67,25 @@
 	gpu-subsystem {
 		status = "okay";
 	};
+
+	reserved-memory {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges;
+
+		display_reserved: framebuffer {
+			compatible = "marvell,dove-framebuffer";
+			size = <0x02000000>;
+			alignment = <0x02000000>;
+			no-map;
+		};
+	};
+
+	display-subsystem {
+		compatible = "marvell,dove-display-subsystem";
+		memory-region = <&display_reserved>;
+		ports = <&lcd0_port>;
+	};
 };
 
 &uart0 { status = "okay"; };
@@ -117,6 +136,30 @@
 			silabs,pll-master;
 		};
 	};
+
+	tda998x: hdmi-encoder {
+		compatible = "nxp,tda998x";
+		reg = <0x70>;
+		video-ports = <0x234501>;
+		interrupts-extended = <&gpio0 27 IRQ_TYPE_LEVEL_LOW>;
+
+		port {
+			tda998x_video: endpoint {
+				remote-endpoint = <&lcd0_rgb>;
+			};
+		};
+	};
+};
+
+&lcd0 {
+	status = "okay";
+	clocks = <&si5351 0>;
+	clock-names = "ext_ref_clk1";
+	lcd0_port: port {
+		lcd0_rgb: endpoint {
+			remote-endpoint = <&tda998x_video>;
+		};
+	};
 };
 
 &sdio0 {
-- 
2.7.4

[PATCH 3/3] ARM: dts: cubox: add LCD controller and TDA998x configuration

[Gregory CLEMENT]

Hi Russell,
 
 On mar., juil. 10 2018, Russell King <rmk+kernel@arm.linux.org.uk> wrote:

> Add DT configuration for the HDMI display output on the Dove Cubox.
> This adds support for the LCD0 controller which is connected to a
> TDA19988 HDMI encoder.
>
> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
> ---
>  arch/arm/boot/dts/dove-cubox.dts | 43 ++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 43 insertions(+)
>
> diff --git a/arch/arm/boot/dts/dove-cubox.dts b/arch/arm/boot/dts/dove-cubox.dts
> index 580e3cbcfbf7..f6dd56f63d09 100644
> --- a/arch/arm/boot/dts/dove-cubox.dts
> +++ b/arch/arm/boot/dts/dove-cubox.dts
> @@ -67,6 +67,25 @@
>  	gpu-subsystem {
>  		status = "okay";
>  	};
> +
> +	reserved-memory {
> +		#address-cells = <1>;
> +		#size-cells = <1>;
> +		ranges;
> +
> +		display_reserved: framebuffer {
> +			compatible = "marvell,dove-framebuffer";

I didn't find the binding documentation associated to
"marvell,dove-framebuffer".

Could you point me on the accurate file?


> +			size = <0x02000000>;
> +			alignment = <0x02000000>;
> +			no-map;
> +		};
> +	};
> +
> +	display-subsystem {
> +		compatible = "marvell,dove-display-subsystem";

Same for this one.

Thanks,

Gregory

> +		memory-region = <&display_reserved>;
> +		ports = <&lcd0_port>;
> +	};
>  };
>  
>  &uart0 { status = "okay"; };
> @@ -117,6 +136,30 @@
>  			silabs,pll-master;
>  		};
>  	};
> +
> +	tda998x: hdmi-encoder {
> +		compatible = "nxp,tda998x";
> +		reg = <0x70>;
> +		video-ports = <0x234501>;
> +		interrupts-extended = <&gpio0 27 IRQ_TYPE_LEVEL_LOW>;
> +
> +		port {
> +			tda998x_video: endpoint {
> +				remote-endpoint = <&lcd0_rgb>;
> +			};
> +		};
> +	};
> +};
> +
> +&lcd0 {
> +	status = "okay";
> +	clocks = <&si5351 0>;
> +	clock-names = "ext_ref_clk1";
> +	lcd0_port: port {
> +		lcd0_rgb: endpoint {
> +			remote-endpoint = <&tda998x_video>;
> +		};
> +	};
>  };
>  
>  &sdio0 {
> -- 
> 2.7.4
>

-- 
Gregory Clement, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
http://bootlin.com

Re: [PATCH 2/3] drm/armada: add OF reserved memory support

[Lubomir Rintel]

On Tue, 2018-07-10 at 11:24 +0100, Russell King wrote:
> Existing Armada DRM makes use of reserved memory for allocating
> contiguous screen buffers, which currently prevents its use with
> DT systems.  Add support for this for DT systems.
> 
> Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
> ---
>  drivers/gpu/drm/armada/Makefile      |  3 +++
>  drivers/gpu/drm/armada/armada_drv.c  | 24 ++++++++++++++++--
>  drivers/gpu/drm/armada/armada_rmem.c | 49
> ++++++++++++++++++++++++++++++++++++
>  3 files changed, 74 insertions(+), 2 deletions(-)
>  create mode 100644 drivers/gpu/drm/armada/armada_rmem.c
> 
> diff --git a/drivers/gpu/drm/armada/Makefile
> b/drivers/gpu/drm/armada/Makefile
> index ecf25cf9f9f5..0b8bf3b8aa6a 100644
> --- a/drivers/gpu/drm/armada/Makefile
> +++ b/drivers/gpu/drm/armada/Makefile
> @@ -5,3 +5,6 @@ armada-y	+= armada_510.o
>  armada-$(CONFIG_DEBUG_FS) += armada_debugfs.o
>  
>  obj-$(CONFIG_DRM_ARMADA) := armada.o
> +
> +armada-rmem-$(CONFIG_DRM_ARMADA) += armada_rmem.o
> +obj-y += $(armada-rmem-y) $(armada-rmem-m)
> diff --git a/drivers/gpu/drm/armada/armada_drv.c
> b/drivers/gpu/drm/armada/armada_drv.c
> index 217f0590fd61..a9ee492a2810 100644
> --- a/drivers/gpu/drm/armada/armada_drv.c
> +++ b/drivers/gpu/drm/armada/armada_drv.c
> @@ -9,6 +9,7 @@
>  #include <linux/component.h>
>  #include <linux/module.h>
>  #include <linux/of_graph.h>
> +#include <linux/of_reserved_mem.h>
>  #include <drm/drm_crtc_helper.h>
>  #include <drm/drm_fb_helper.h>
>  #include <drm/drm_of.h>
> @@ -96,6 +97,9 @@ static int armada_drm_bind(struct device *dev)
>  			return -EINVAL;
>  	}
>  
> +	if (!mem && dev->of_node)
> +		mem = dev->platform_data;
> +
>  	if (!mem)
>  		return -ENXIO;
>  
> @@ -250,9 +254,17 @@ static int armada_drm_probe(struct
> platform_device *pdev)
>  	struct device *dev = &pdev->dev;
>  	int ret;
>  
> -	ret = drm_of_component_probe(dev, compare_dev_name,
> &armada_master_ops);
> -	if (ret != -EINVAL)
> +	if (dev->of_node) {
> +		ret = of_reserved_mem_device_init(dev);
> +		if (ret && ret != -ENODEV)
> +			return ret;
> +
> +		ret = drm_of_component_probe(dev, compare_of,
> +					     &armada_master_ops);
> +		if (ret)
> +			of_reserved_mem_device_release(dev);
>  		return ret;
> +	}
>  
>  	if (dev->platform_data) {
>  		char **devices = dev->platform_data;
> @@ -287,6 +299,7 @@ static int armada_drm_probe(struct
> platform_device *pdev)
>  static int armada_drm_remove(struct platform_device *pdev)
>  {
>  	component_master_del(&pdev->dev, &armada_master_ops);
> +	of_reserved_mem_device_release(&pdev->dev);
>  	return 0;
>  }
>  
> @@ -300,11 +313,18 @@ static const struct platform_device_id
> armada_drm_platform_ids[] = {
>  };
>  MODULE_DEVICE_TABLE(platform, armada_drm_platform_ids);
>  
> +static const struct of_device_id armada_drm_dt_ids[] = {
> +	{ .compatible = "marvell,dove-display-subsystem", },
> +	{ /* sentinel */ },
> +};
> +MODULE_DEVICE_TABLE(of, armada_drm_dt_ids);
> +
>  static struct platform_driver armada_drm_platform_driver = {
>  	.probe	= armada_drm_probe,
>  	.remove	= armada_drm_remove,
>  	.driver	= {
>  		.name	= "armada-drm",
> +		.of_match_table = armada_drm_dt_ids,
>  	},
>  	.id_table = armada_drm_platform_ids,
>  };
> diff --git a/drivers/gpu/drm/armada/armada_rmem.c
> b/drivers/gpu/drm/armada/armada_rmem.c
> new file mode 100644
> index 000000000000..36bb20e426b6
> --- /dev/null
> +++ b/drivers/gpu/drm/armada/armada_rmem.c
> @@ -0,0 +1,49 @@
> +// SPDX-License-Identifier: GPL-2.0
> +// Copyright (C) 2017 Russell King
> +#include <linux/errno.h>
> +#include <linux/of.h>
> +#include <linux/of_reserved_mem.h>
> +#include <linux/slab.h>
> +
> +static int armada_rmem_dev_init(struct reserved_mem *rmem, struct
> device *dev)
> +{
> +	struct resource *r;
> +
> +	if (dev->platform_data)
> +		return -EBUSY;
> +
> +	r = kzalloc(sizeof(*r), GFP_KERNEL);
> +	if (!r)
> +		return -ENOMEM;
> +
> +	r->start = rmem->base;
> +	r->end = rmem->base + rmem->size - 1;
> +	r->flags = IORESOURCE_MEM;
> +
> +	rmem->priv = r;
> +	dev->platform_data = r;
> +
> +	return 0;
> +}
> +
> +static void armada_rmem_dev_release(struct reserved_mem *rmem,
> +	struct device *dev)
> +{
> +	kfree(rmem->priv);
> +	rmem->priv = NULL;
> +	dev->platform_data = NULL;
> +}
> +
> +static const struct reserved_mem_ops armada_rmem_ops = {
> +	.device_init = armada_rmem_dev_init,
> +	.device_release = armada_rmem_dev_release,
> +};
> +
> +static int __init armada_rmem_init(struct reserved_mem *rmem)
> +{
> +	rmem->ops = &armada_rmem_ops;
> +	return 0;
> +}
> +
> +RESERVEDMEM_OF_DECLARE(armada_rmem, "marvell,dove-framebuffer",
> +			armada_rmem_init);

Hi,

wouldn't "marvell,armada-framebuffer" make more sense here?
The driver will do just well for MMP2 and perhaps more hardware that is
not Dove; the DTs could just say:

compatible = "marvell,dove-framebuffer", "marvell,armada-framebuffer";
compatible = "marvell,mmp2-framebuffer", "marvell,armada-framebuffer";

Lubo


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Re: [PATCH 0/3] Finish Armada DRM DT support

[Lubomir Rintel]

On Tue, 2018-07-10 at 11:23 +0100, Russell King - ARM Linux wrote:
> Finish Armada DRM support for DT, finally allowing mainline kernels to
> use this driver unimpeded.
> 
>  arch/arm/boot/dts/dove-cubox.dts     | 43 +++++++++++++++++++++++++++++++
>  drivers/gpu/drm/armada/Makefile      |  3 +++
>  drivers/gpu/drm/armada/armada_drv.c  | 29 ++++++++++++++++++---
>  drivers/gpu/drm/armada/armada_rmem.c | 49 ++++++++++++++++++++++++++++++++++++
>  4 files changed, 121 insertions(+), 3 deletions(-)

Hi,

thank you for these patches. I've found them while figuring out how to
make the Armada DRM driver work on an OLPC XO-1.75. Seems like they
slipped through the cracks and were never applied.

With a little more work they indeed seem to work well on my laptop.
Feel free to slap in my Tested-by tag (and Reviewed-by, if one from me
is any worth in the DRM land):

Tested-by: Lubomir Rintel <lkundrak@v3.sk>
Reviewed-by: Lubomir Rintel <lkundrak@v3.sk>

The testing essentially consisted of checking that framebuffer
emulation, console and "weston --use-pixman" work.

I'll post the XO-1.75 patches that build on top of this soonish. I'm
fairly new to DRM and they would certainly require significant changes
before they could be integrated though.

Thanks,
Lubo


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