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Groups > linux.kernel > #1705743 > unrolled thread

[PATCH v4 0/5] Support for LEGO MINDSTORMS EV3 LCD display

Started byDavid Lechner <david@lechnology.com>
First post2017-08-07 19:50 +0200
Last post2017-08-09 18:00 +0200
Articles 5 — 2 participants

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Contents

  [PATCH v4 0/5] Support for LEGO MINDSTORMS EV3 LCD display David Lechner <david@lechnology.com> - 2017-08-07 19:50 +0200
    [PATCH v4 4/5] ARM: dts: da850-lego-ev3: Add node for LCD display David Lechner <david@lechnology.com> - 2017-08-07 19:50 +0200
    [PATCH v4 5/5] ARM: davinci_all_defconfig: enable tinydrm and ST7586 David Lechner <david@lechnology.com> - 2017-08-07 19:50 +0200
    [PATCH v4 1/5] drm/tinydrm: Generalize tinydrm_xrgb8888_to_gray8() David Lechner <david@lechnology.com> - 2017-08-07 19:50 +0200
      Re: [PATCH v4 1/5] drm/tinydrm: Generalize  tinydrm_xrgb8888_to_gray8() Noralf Trønnes <noralf@tronnes.org> - 2017-08-09 18:00 +0200

#1705743 — [PATCH v4 0/5] Support for LEGO MINDSTORMS EV3 LCD display

FromDavid Lechner <david@lechnology.com>
Date2017-08-07 19:50 +0200
Subject[PATCH v4 0/5] Support for LEGO MINDSTORMS EV3 LCD display
Message-ID<ubUk9-3qL-11@gated-at.bofh.it>
The goal of this series is to get the built-in LCD of the LEGO MINDSTORMS EV3
working.

v2 changes:
* Wrote a new driver for ST7586 instead of combining it with existing drivers
* Don't touch MIPI DBI code (other than the patch suggested by Noralf)
* New defconfig patch

v3 changes:
* New patch to generalize tinydrm_xrgb8888_to_gray8() so that it can be reused.
* Device tree bindings in separate patch.
* Fixed incorrect device tree binding pin descriptions.
* Added MAINTAINERS entry for drivers/gpu/drm/tinydrm/st7586.c.
* Removed "mipi_dbi_" from function names in st7586.c.
* Moved init and fini to pipe_enable and pipe_disable ops.
* Dropped RGB565 format.
* Made adjustments for the fact the controller cannot be read via SPI.
* Dropped st7586.h - values moved into st7586.c.

v4 changes:
* Dropped patch "drm/tinydrm: remove call to mipi_dbi_init()
  from mipi_dbi_spi_init()" since it has been applied.
* correct order for MAINTAINERS entry
* Drop code/dt bindings not used by LEGO EV3 (regulator, backlight, etc)
* Make gpios required
* Use lookup table for pixel packing algorithm
* Don't modify clip when used as function parameter
* Rename dc to a0 since that is what is on the datasheet/LEGO schematic.

David Lechner (5):
  drm/tinydrm: Generalize tinydrm_xrgb8888_to_gray8()
  dt-bindings: add binding for Sitronix ST7586 display panels
  drm/tinydrm: add support for LEGO MINDSTORMS EV3 LCD
  ARM: dts: da850-lego-ev3: Add node for LCD display
  ARM: davinci_all_defconfig: enable tinydrm and ST7586

 .../bindings/display/sitronix,st7586.txt           |  22 ++
 MAINTAINERS                                        |   6 +
 arch/arm/boot/dts/da850-lego-ev3.dts               |  24 ++
 arch/arm/configs/davinci_all_defconfig             |   2 +
 drivers/gpu/drm/tinydrm/Kconfig                    |  10 +
 drivers/gpu/drm/tinydrm/Makefile                   |   1 +
 drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c     |  42 +-
 drivers/gpu/drm/tinydrm/repaper.c                  |  28 +-
 drivers/gpu/drm/tinydrm/st7586.c                   | 428 +++++++++++++++++++++
 include/drm/tinydrm/tinydrm-helpers.h              |   3 +-
 10 files changed, 534 insertions(+), 32 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/display/sitronix,st7586.txt
 create mode 100644 drivers/gpu/drm/tinydrm/st7586.c

-- 
2.7.4

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#1705746 — [PATCH v4 4/5] ARM: dts: da850-lego-ev3: Add node for LCD display

FromDavid Lechner <david@lechnology.com>
Date2017-08-07 19:50 +0200
Subject[PATCH v4 4/5] ARM: dts: da850-lego-ev3: Add node for LCD display
Message-ID<ubUka-3qL-19@gated-at.bofh.it>
In reply to#1705743
This adds a new node for the LEGO MINDSTORMS EV3 LCD display.

Signed-off-by: David Lechner <david@lechnology.com>
---

v4 changes:
* changed dc to a0

 arch/arm/boot/dts/da850-lego-ev3.dts | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/arch/arm/boot/dts/da850-lego-ev3.dts b/arch/arm/boot/dts/da850-lego-ev3.dts
index 45983c0..413dbd5 100644
--- a/arch/arm/boot/dts/da850-lego-ev3.dts
+++ b/arch/arm/boot/dts/da850-lego-ev3.dts
@@ -249,6 +249,15 @@
 			0x4c 0x00000080 0x000000f0
 		>;
 	};
+
+	ev3_lcd_pins: pinmux_lcd {
+		pinctrl-single,bits = <
+			/* SIMO, GP2[11], GP2[12], CLK */
+			0x14 0x00188100 0x00ffff00
+			/* GP5[0] */
+			0x30 0x80000000 0xf0000000
+		>;
+	};
 };
 
 &pinconf {
@@ -357,6 +366,21 @@
 	};
 };
 
+&spi1 {
+	status = "okay";
+	pinctrl-0 = <&ev3_lcd_pins>;
+	pinctrl-names = "default";
+	cs-gpios = <&gpio 44 GPIO_ACTIVE_LOW>;
+
+	display@0{
+		compatible = "lego,ev3-lcd";
+		reg = <0>;
+		spi-max-frequency = <10000000>;
+		a0-gpios = <&gpio 43 GPIO_ACTIVE_HIGH>;
+		reset-gpios = <&gpio 80 GPIO_ACTIVE_HIGH>;
+	};
+};
+
 &ehrpwm0 {
 	status = "okay";
 };
-- 
2.7.4

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#1705757 — [PATCH v4 5/5] ARM: davinci_all_defconfig: enable tinydrm and ST7586

FromDavid Lechner <david@lechnology.com>
Date2017-08-07 19:50 +0200
Subject[PATCH v4 5/5] ARM: davinci_all_defconfig: enable tinydrm and ST7586
Message-ID<ubUkb-3qL-49@gated-at.bofh.it>
In reply to#1705743
This enables the tinydrm and ST7586 panel modules used by the display
on LEGO MINDSTORMS EV3.

Signed-off-by: David Lechner <david@lechnology.com>
---
 arch/arm/configs/davinci_all_defconfig | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm/configs/davinci_all_defconfig b/arch/arm/configs/davinci_all_defconfig
index 06e2e2a..27d9720 100644
--- a/arch/arm/configs/davinci_all_defconfig
+++ b/arch/arm/configs/davinci_all_defconfig
@@ -143,6 +143,8 @@ CONFIG_VIDEO_ADV7343=m
 CONFIG_DRM=m
 CONFIG_DRM_TILCDC=m
 CONFIG_DRM_DUMB_VGA_DAC=m
+CONFIG_DRM_TINYDRM=m
+CONFIG_TINYDRM_ST7586=m
 CONFIG_FB=y
 CONFIG_FIRMWARE_EDID=y
 CONFIG_FB_DA8XX=y
-- 
2.7.4

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#1705760 — [PATCH v4 1/5] drm/tinydrm: Generalize tinydrm_xrgb8888_to_gray8()

FromDavid Lechner <david@lechnology.com>
Date2017-08-07 19:50 +0200
Subject[PATCH v4 1/5] drm/tinydrm: Generalize tinydrm_xrgb8888_to_gray8()
Message-ID<ubUkb-3qL-55@gated-at.bofh.it>
In reply to#1705743
This adds parameters for vaddr and clip to tinydrm_xrgb8888_to_gray8() to
make it more generic.

dma_buf_{begin,end}_cpu_access() are moved out to the repaper driver.

Return type is change to void to simplify error handling by callers.

Signed-off-by: David Lechner <david@lechnology.com>
---

v4 changes:
* Change return type to void.


 drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c | 42 +++++++++-----------------
 drivers/gpu/drm/tinydrm/repaper.c              | 28 +++++++++++++++--
 include/drm/tinydrm/tinydrm-helpers.h          |  3 +-
 3 files changed, 41 insertions(+), 32 deletions(-)

diff --git a/drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c b/drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c
index 75808bb..bd6cce0 100644
--- a/drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c
+++ b/drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c
@@ -185,7 +185,9 @@ EXPORT_SYMBOL(tinydrm_xrgb8888_to_rgb565);
 /**
  * tinydrm_xrgb8888_to_gray8 - Convert XRGB8888 to grayscale
  * @dst: 8-bit grayscale destination buffer
+ * @vaddr: XRGB8888 source buffer
  * @fb: DRM framebuffer
+ * @clip: Clip rectangle area to copy
  *
  * Drm doesn't have native monochrome or grayscale support.
  * Such drivers can announce the commonly supported XR24 format to userspace
@@ -195,41 +197,31 @@ EXPORT_SYMBOL(tinydrm_xrgb8888_to_rgb565);
  * where 1 means foreground color and 0 background color.
  *
  * ITU BT.601 is used for the RGB -> luma (brightness) conversion.
- *
- * Returns:
- * Zero on success, negative error code on failure.
  */
-int tinydrm_xrgb8888_to_gray8(u8 *dst, struct drm_framebuffer *fb)
+void tinydrm_xrgb8888_to_gray8(u8 *dst, void *vaddr, struct drm_framebuffer *fb,
+			       struct drm_clip_rect *clip)
 {
-	struct drm_gem_cma_object *cma_obj = drm_fb_cma_get_gem_obj(fb, 0);
-	struct dma_buf_attachment *import_attach = cma_obj->base.import_attach;
-	unsigned int x, y, pitch = fb->pitches[0];
-	int ret = 0;
+	unsigned int len = (clip->x2 - clip->x1) * sizeof(u32);
+	unsigned int x, y;
 	void *buf;
 	u32 *src;
 
 	if (WARN_ON(fb->format->format != DRM_FORMAT_XRGB8888))
-		return -EINVAL;
+		return;
 	/*
 	 * The cma memory is write-combined so reads are uncached.
 	 * Speed up by fetching one line at a time.
 	 */
-	buf = kmalloc(pitch, GFP_KERNEL);
+	buf = kmalloc(len, GFP_KERNEL);
 	if (!buf)
-		return -ENOMEM;
-
-	if (import_attach) {
-		ret = dma_buf_begin_cpu_access(import_attach->dmabuf,
-					       DMA_FROM_DEVICE);
-		if (ret)
-			goto err_free;
-	}
+		return;
 
-	for (y = 0; y < fb->height; y++) {
-		src = cma_obj->vaddr + (y * pitch);
-		memcpy(buf, src, pitch);
+	for (y = clip->y1; y < clip->y2; y++) {
+		src = vaddr + (y * fb->pitches[0]);
+		src += clip->x1;
+		memcpy(buf, src, len);
 		src = buf;
-		for (x = 0; x < fb->width; x++) {
+		for (x = clip->x1; x < clip->x2; x++) {
 			u8 r = (*src & 0x00ff0000) >> 16;
 			u8 g = (*src & 0x0000ff00) >> 8;
 			u8 b =  *src & 0x000000ff;
@@ -240,13 +232,7 @@ int tinydrm_xrgb8888_to_gray8(u8 *dst, struct drm_framebuffer *fb)
 		}
 	}
 
-	if (import_attach)
-		ret = dma_buf_end_cpu_access(import_attach->dmabuf,
-					     DMA_FROM_DEVICE);
-err_free:
 	kfree(buf);
-
-	return ret;
 }
 EXPORT_SYMBOL(tinydrm_xrgb8888_to_gray8);
 
diff --git a/drivers/gpu/drm/tinydrm/repaper.c b/drivers/gpu/drm/tinydrm/repaper.c
index 3343d3f..30dc97b 100644
--- a/drivers/gpu/drm/tinydrm/repaper.c
+++ b/drivers/gpu/drm/tinydrm/repaper.c
@@ -18,6 +18,7 @@
  */
 
 #include <linux/delay.h>
+#include <linux/dma-buf.h>
 #include <linux/gpio/consumer.h>
 #include <linux/module.h>
 #include <linux/of_device.h>
@@ -525,11 +526,20 @@ static int repaper_fb_dirty(struct drm_framebuffer *fb,
 			    struct drm_clip_rect *clips,
 			    unsigned int num_clips)
 {
+	struct drm_gem_cma_object *cma_obj = drm_fb_cma_get_gem_obj(fb, 0);
+	struct dma_buf_attachment *import_attach = cma_obj->base.import_attach;
 	struct tinydrm_device *tdev = fb->dev->dev_private;
 	struct repaper_epd *epd = epd_from_tinydrm(tdev);
+	struct drm_clip_rect clip;
 	u8 *buf = NULL;
 	int ret = 0;
 
+	/* repaper can't do partial updates */
+	clip.x1 = 0;
+	clip.x2 = fb->width;
+	clip.y1 = 0;
+	clip.y2 = fb->height;
+
 	mutex_lock(&tdev->dirty_lock);
 
 	if (!epd->enabled)
@@ -550,9 +560,21 @@ static int repaper_fb_dirty(struct drm_framebuffer *fb,
 		goto out_unlock;
 	}
 
-	ret = tinydrm_xrgb8888_to_gray8(buf, fb);
-	if (ret)
-		goto out_unlock;
+	if (import_attach) {
+		ret = dma_buf_begin_cpu_access(import_attach->dmabuf,
+					       DMA_FROM_DEVICE);
+		if (ret)
+			goto out_unlock;
+	}
+
+	tinydrm_xrgb8888_to_gray8(buf, cma_obj->vaddr, fb, &clip);
+
+	if (import_attach) {
+		ret = dma_buf_end_cpu_access(import_attach->dmabuf,
+					     DMA_FROM_DEVICE);
+		if (ret)
+			goto out_unlock;
+	}
 
 	repaper_gray8_to_mono_reversed(buf, fb->width, fb->height);
 
diff --git a/include/drm/tinydrm/tinydrm-helpers.h b/include/drm/tinydrm/tinydrm-helpers.h
index a6c387f..d554ded 100644
--- a/include/drm/tinydrm/tinydrm-helpers.h
+++ b/include/drm/tinydrm/tinydrm-helpers.h
@@ -43,7 +43,8 @@ void tinydrm_swab16(u16 *dst, void *vaddr, struct drm_framebuffer *fb,
 void tinydrm_xrgb8888_to_rgb565(u16 *dst, void *vaddr,
 				struct drm_framebuffer *fb,
 				struct drm_clip_rect *clip, bool swap);
-int tinydrm_xrgb8888_to_gray8(u8 *dst, struct drm_framebuffer *fb);
+void tinydrm_xrgb8888_to_gray8(u8 *dst, void *vaddr, struct drm_framebuffer *fb,
+			       struct drm_clip_rect *clip);
 
 struct backlight_device *tinydrm_of_find_backlight(struct device *dev);
 int tinydrm_enable_backlight(struct backlight_device *backlight);
-- 
2.7.4

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#1707435 — Re: [PATCH v4 1/5] drm/tinydrm: Generalize tinydrm_xrgb8888_to_gray8()

FromNoralf Trønnes <noralf@tronnes.org>
Date2017-08-09 18:00 +0200
SubjectRe: [PATCH v4 1/5] drm/tinydrm: Generalize tinydrm_xrgb8888_to_gray8()
Message-ID<ucByO-T5-7@gated-at.bofh.it>
In reply to#1705760
Den 07.08.2017 19.39, skrev David Lechner:
> This adds parameters for vaddr and clip to tinydrm_xrgb8888_to_gray8() to
> make it more generic.
>
> dma_buf_{begin,end}_cpu_access() are moved out to the repaper driver.
>
> Return type is change to void to simplify error handling by callers.
>
> Signed-off-by: David Lechner <david@lechnology.com>
> ---

Thanks for doing this, applied to drm-misc.

Noralf.

> v4 changes:
> * Change return type to void.
>
>
>   drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c | 42 +++++++++-----------------
>   drivers/gpu/drm/tinydrm/repaper.c              | 28 +++++++++++++++--
>   include/drm/tinydrm/tinydrm-helpers.h          |  3 +-
>   3 files changed, 41 insertions(+), 32 deletions(-)
>
> diff --git a/drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c b/drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c
> index 75808bb..bd6cce0 100644
> --- a/drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c
> +++ b/drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c
> @@ -185,7 +185,9 @@ EXPORT_SYMBOL(tinydrm_xrgb8888_to_rgb565);
>   /**
>    * tinydrm_xrgb8888_to_gray8 - Convert XRGB8888 to grayscale
>    * @dst: 8-bit grayscale destination buffer
> + * @vaddr: XRGB8888 source buffer
>    * @fb: DRM framebuffer
> + * @clip: Clip rectangle area to copy
>    *
>    * Drm doesn't have native monochrome or grayscale support.
>    * Such drivers can announce the commonly supported XR24 format to userspace
> @@ -195,41 +197,31 @@ EXPORT_SYMBOL(tinydrm_xrgb8888_to_rgb565);
>    * where 1 means foreground color and 0 background color.
>    *
>    * ITU BT.601 is used for the RGB -> luma (brightness) conversion.
> - *
> - * Returns:
> - * Zero on success, negative error code on failure.
>    */
> -int tinydrm_xrgb8888_to_gray8(u8 *dst, struct drm_framebuffer *fb)
> +void tinydrm_xrgb8888_to_gray8(u8 *dst, void *vaddr, struct drm_framebuffer *fb,
> +			       struct drm_clip_rect *clip)
>   {
> -	struct drm_gem_cma_object *cma_obj = drm_fb_cma_get_gem_obj(fb, 0);
> -	struct dma_buf_attachment *import_attach = cma_obj->base.import_attach;
> -	unsigned int x, y, pitch = fb->pitches[0];
> -	int ret = 0;
> +	unsigned int len = (clip->x2 - clip->x1) * sizeof(u32);
> +	unsigned int x, y;
>   	void *buf;
>   	u32 *src;
>   
>   	if (WARN_ON(fb->format->format != DRM_FORMAT_XRGB8888))
> -		return -EINVAL;
> +		return;
>   	/*
>   	 * The cma memory is write-combined so reads are uncached.
>   	 * Speed up by fetching one line at a time.
>   	 */
> -	buf = kmalloc(pitch, GFP_KERNEL);
> +	buf = kmalloc(len, GFP_KERNEL);
>   	if (!buf)
> -		return -ENOMEM;
> -
> -	if (import_attach) {
> -		ret = dma_buf_begin_cpu_access(import_attach->dmabuf,
> -					       DMA_FROM_DEVICE);
> -		if (ret)
> -			goto err_free;
> -	}
> +		return;
>   
> -	for (y = 0; y < fb->height; y++) {
> -		src = cma_obj->vaddr + (y * pitch);
> -		memcpy(buf, src, pitch);
> +	for (y = clip->y1; y < clip->y2; y++) {
> +		src = vaddr + (y * fb->pitches[0]);
> +		src += clip->x1;
> +		memcpy(buf, src, len);
>   		src = buf;
> -		for (x = 0; x < fb->width; x++) {
> +		for (x = clip->x1; x < clip->x2; x++) {
>   			u8 r = (*src & 0x00ff0000) >> 16;
>   			u8 g = (*src & 0x0000ff00) >> 8;
>   			u8 b =  *src & 0x000000ff;
> @@ -240,13 +232,7 @@ int tinydrm_xrgb8888_to_gray8(u8 *dst, struct drm_framebuffer *fb)
>   		}
>   	}
>   
> -	if (import_attach)
> -		ret = dma_buf_end_cpu_access(import_attach->dmabuf,
> -					     DMA_FROM_DEVICE);
> -err_free:
>   	kfree(buf);
> -
> -	return ret;
>   }
>   EXPORT_SYMBOL(tinydrm_xrgb8888_to_gray8);
>   
> diff --git a/drivers/gpu/drm/tinydrm/repaper.c b/drivers/gpu/drm/tinydrm/repaper.c
> index 3343d3f..30dc97b 100644
> --- a/drivers/gpu/drm/tinydrm/repaper.c
> +++ b/drivers/gpu/drm/tinydrm/repaper.c
> @@ -18,6 +18,7 @@
>    */
>   
>   #include <linux/delay.h>
> +#include <linux/dma-buf.h>
>   #include <linux/gpio/consumer.h>
>   #include <linux/module.h>
>   #include <linux/of_device.h>
> @@ -525,11 +526,20 @@ static int repaper_fb_dirty(struct drm_framebuffer *fb,
>   			    struct drm_clip_rect *clips,
>   			    unsigned int num_clips)
>   {
> +	struct drm_gem_cma_object *cma_obj = drm_fb_cma_get_gem_obj(fb, 0);
> +	struct dma_buf_attachment *import_attach = cma_obj->base.import_attach;
>   	struct tinydrm_device *tdev = fb->dev->dev_private;
>   	struct repaper_epd *epd = epd_from_tinydrm(tdev);
> +	struct drm_clip_rect clip;
>   	u8 *buf = NULL;
>   	int ret = 0;
>   
> +	/* repaper can't do partial updates */
> +	clip.x1 = 0;
> +	clip.x2 = fb->width;
> +	clip.y1 = 0;
> +	clip.y2 = fb->height;
> +
>   	mutex_lock(&tdev->dirty_lock);
>   
>   	if (!epd->enabled)
> @@ -550,9 +560,21 @@ static int repaper_fb_dirty(struct drm_framebuffer *fb,
>   		goto out_unlock;
>   	}
>   
> -	ret = tinydrm_xrgb8888_to_gray8(buf, fb);
> -	if (ret)
> -		goto out_unlock;
> +	if (import_attach) {
> +		ret = dma_buf_begin_cpu_access(import_attach->dmabuf,
> +					       DMA_FROM_DEVICE);
> +		if (ret)
> +			goto out_unlock;
> +	}
> +
> +	tinydrm_xrgb8888_to_gray8(buf, cma_obj->vaddr, fb, &clip);
> +
> +	if (import_attach) {
> +		ret = dma_buf_end_cpu_access(import_attach->dmabuf,
> +					     DMA_FROM_DEVICE);
> +		if (ret)
> +			goto out_unlock;
> +	}
>   
>   	repaper_gray8_to_mono_reversed(buf, fb->width, fb->height);
>   
> diff --git a/include/drm/tinydrm/tinydrm-helpers.h b/include/drm/tinydrm/tinydrm-helpers.h
> index a6c387f..d554ded 100644
> --- a/include/drm/tinydrm/tinydrm-helpers.h
> +++ b/include/drm/tinydrm/tinydrm-helpers.h
> @@ -43,7 +43,8 @@ void tinydrm_swab16(u16 *dst, void *vaddr, struct drm_framebuffer *fb,
>   void tinydrm_xrgb8888_to_rgb565(u16 *dst, void *vaddr,
>   				struct drm_framebuffer *fb,
>   				struct drm_clip_rect *clip, bool swap);
> -int tinydrm_xrgb8888_to_gray8(u8 *dst, struct drm_framebuffer *fb);
> +void tinydrm_xrgb8888_to_gray8(u8 *dst, void *vaddr, struct drm_framebuffer *fb,
> +			       struct drm_clip_rect *clip);
>   
>   struct backlight_device *tinydrm_of_find_backlight(struct device *dev);
>   int tinydrm_enable_backlight(struct backlight_device *backlight);

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