[U-Boot] [PATCH 3/3] video: add config option to skip framebuffer clear

[U-Boot] [PATCH 3/3] video: add config option to skip framebuffer clear

[Rob Clark]

The use-case is that the thing that loaded u-boot already put a splash
image on screen.  And we want to preserve that until grub boot menu
takes over.

Signed-off-by: Rob Clark <robdclark@gmail.com>
---
 drivers/video/Kconfig        | 8 ++++++++
 drivers/video/cfb_console.c  | 3 ++-
 drivers/video/video-uclass.c | 4 +++-
 3 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index 8eb0359231..7b56b20344 100644
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -98,6 +98,14 @@ config SYS_WHITE_ON_BLACK
 	 better in low-light situations or to reduce eye strain in some
 	 cases.
 
+config NO_FB_CLEAR
+	bool "Skip framebuffer clear"
+	help
+	  If firmware (whatever loads u-boot) has already put a splash image
+	  on screen, you might want to preserve it until whatever u-boots
+	  loads takes over the screen.  This, for example, can be used to
+	  keep splash image on screen until grub graphical boot menu starts.
+
 source "drivers/video/fonts/Kconfig"
 
 config VIDCONSOLE_AS_LCD
diff --git a/drivers/video/cfb_console.c b/drivers/video/cfb_console.c
index f54802052e..85fa5b0cae 100644
--- a/drivers/video/cfb_console.c
+++ b/drivers/video/cfb_console.c
@@ -2091,7 +2091,8 @@ static int cfg_video_init(void)
 	}
 	eorx = fgx ^ bgx;
 
-	video_clear();
+	if (!CONFIG_IS_ENABLED(NO_FB_CLEAR))
+		video_clear();
 
 #ifdef CONFIG_VIDEO_LOGO
 	/* Plot the logo and get start point of console */
diff --git a/drivers/video/video-uclass.c b/drivers/video/video-uclass.c
index 3036e3a1f2..dfa39b0d1b 100644
--- a/drivers/video/video-uclass.c
+++ b/drivers/video/video-uclass.c
@@ -199,7 +199,9 @@ static int video_post_probe(struct udevice *dev)
 #else
 	priv->colour_bg = 0xffffff;
 #endif
-	video_clear(dev);
+
+	if (!CONFIG_IS_ENABLED(NO_FB_CLEAR))
+		video_clear(dev);
 
 	/*
 	 * Create a text console device. For now we always do this, although
-- 
2.13.0

[U-Boot] [PATCH 1/3] dm: core: also parse chosen node

[Rob Clark]

This is the node that would contain, for example, the framebuffer setup
by an earlier stage.

Signed-off-by: Rob Clark <robdclark@gmail.com>
---
 drivers/core/root.c | 22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

diff --git a/drivers/core/root.c b/drivers/core/root.c
index d691d6ff94..5e6b2da248 100644
--- a/drivers/core/root.c
+++ b/drivers/core/root.c
@@ -266,6 +266,26 @@ static int dm_scan_fdt_node(struct udevice *parent, const void *blob,
 	for (offset = fdt_first_subnode(blob, offset);
 	     offset > 0;
 	     offset = fdt_next_subnode(blob, offset)) {
+		ofnode node = offset_to_ofnode(offset);
+
+		/* "chosen" node isn't a device itself but may contain some: */
+		if (strcmp(ofnode_get_name(node), "chosen") == 0) {
+			dm_dbg("parsing subnodes of \"chosen\"\n");
+
+			for (node = ofnode_first_subnode(node);
+			     ofnode_valid(node);
+			     node = ofnode_next_subnode(node)) {
+				dm_dbg("subnode: %s\n", ofnode_get_name(node));
+				err = lists_bind_fdt(parent, node, NULL);
+				if (err && !ret) {
+					ret = err;
+					dm_dbg("%s: ret=%d\n", ofnode_get_name(node), ret);
+				}
+			}
+
+			continue;
+		}
+
 		if (pre_reloc_only &&
 		    !dm_fdt_pre_reloc(blob, offset))
 			continue;
@@ -273,7 +293,7 @@ static int dm_scan_fdt_node(struct udevice *parent, const void *blob,
 			dm_dbg("   - ignoring disabled device\n");
 			continue;
 		}
-		err = lists_bind_fdt(parent, offset_to_ofnode(offset), NULL);
+		err = lists_bind_fdt(parent, node, NULL);
 		if (err && !ret) {
 			ret = err;
 			debug("%s: ret=%d\n", fdt_get_name(blob, offset, NULL),
-- 
2.13.0

[U-Boot] [PATCH 2/3] video: simplefb

[Rob Clark]

Not really qcom specific, but for now qcom/lk is the one firmware that
is (afaiu) setting up the appropriate dt node for pre-configured
display.  Uses the generic simple-framebuffer DT bindings so this should
be useful on other platforms.

Signed-off-by: Rob Clark <robdclark@gmail.com>
---
 drivers/video/Kconfig    | 10 +++++++
 drivers/video/Makefile   |  2 +-
 drivers/video/simplefb.c | 71 ++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 82 insertions(+), 1 deletion(-)
 create mode 100644 drivers/video/simplefb.c

diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index 61dfed8c06..8eb0359231 100644
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -628,4 +628,14 @@ config VIDEO_DW_HDMI
 	  rather requires a SoC-specific glue driver to call it), it
 	  can not be enabled from the configuration menu.
 
+config VIDEO_SIMPLE
+	bool "Simple display driver for preconfigured display"
+	help
+	  Enables a simple generic display driver which utilizes the
+	  simple-framebuffer devicetree bindings.
+
+	  This driver assumes that the display hardware has been initialized
+	  before u-boot starts, and u-boot will simply render to the pre-
+	  allocated frame buffer surface.
+
 endmenu
diff --git a/drivers/video/Makefile b/drivers/video/Makefile
index ac5371f2ae..52f50f647b 100644
--- a/drivers/video/Makefile
+++ b/drivers/video/Makefile
@@ -57,7 +57,7 @@ obj-$(CONFIG_FORMIKE) += formike.o
 obj-$(CONFIG_LG4573) += lg4573.o
 obj-$(CONFIG_AM335X_LCD) += am335x-fb.o
 obj-$(CONFIG_VIDEO_DW_HDMI) += dw_hdmi.o
-
+obj-$(CONFIG_VIDEO_SIMPLE) += simplefb.o
 obj-${CONFIG_VIDEO_TEGRA124} += tegra124/
 obj-${CONFIG_EXYNOS_FB} += exynos/
 obj-${CONFIG_VIDEO_ROCKCHIP} += rockchip/
diff --git a/drivers/video/simplefb.c b/drivers/video/simplefb.c
new file mode 100644
index 0000000000..035a9761b9
--- /dev/null
+++ b/drivers/video/simplefb.c
@@ -0,0 +1,71 @@
+/*
+ * (C) Copyright 2017 Rob Clark
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <fdtdec.h>
+#include <fdt_support.h>
+#include <video.h>
+
+static int simple_video_probe(struct udevice *dev)
+{
+	struct video_uc_platdata *plat = dev_get_uclass_platdata(dev);
+	struct video_priv *uc_priv = dev_get_uclass_priv(dev);
+	const void *blob = gd->fdt_blob;
+	const int node = dev_of_offset(dev);
+	const char *format;
+	fdt_addr_t base;
+	fdt_size_t size;
+
+	base = fdtdec_get_addr_size_auto_parent(blob, dev_of_offset(dev->parent),
+			node, "reg", 0, &size, false);
+	if (base == FDT_ADDR_T_NONE) {
+		debug("%s: Failed to decode memory region\n", __func__);
+		return -EINVAL;
+	}
+
+	debug("%s: base=%llx, size=%llu\n", __func__, base, size);
+
+	// TODO is there some way to reserve the framebuffer
+	// region so it isn't clobbered?
+	plat->base = base;
+	plat->size = size;
+
+	video_set_flush_dcache(dev, true);
+
+	debug("%s: Query resolution...\n", __func__);
+
+	uc_priv->xsize = fdtdec_get_uint(blob, node, "width", 0);
+	uc_priv->ysize = fdtdec_get_uint(blob, node, "height", 0);
+	uc_priv->rot = 0;
+
+	format = fdt_getprop(blob, node, "format", NULL);
+	debug("%s: %dx%d@%s\n", __func__, uc_priv->xsize, uc_priv->ysize, format);
+
+	if (strcmp(format, "r5g6b5") == 0) {
+		uc_priv->bpix = VIDEO_BPP16;
+	} else if (strcmp(format, "a8b8g8r8") == 0) {
+		uc_priv->bpix = VIDEO_BPP32;
+	} else {
+		printf("%s: invalid format: %s\n", __func__, format);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static const struct udevice_id simple_video_ids[] = {
+	{ .compatible = "simple-framebuffer" },
+	{ }
+};
+
+U_BOOT_DRIVER(simple_video) = {
+	.name	= "simple_video",
+	.id	= UCLASS_VIDEO,
+	.of_match = simple_video_ids,
+	.probe	= simple_video_probe,
+	.flags	= DM_FLAG_PRE_RELOC,
+};
-- 
2.13.0

[U-Boot] [PATCH 3/3] video: add config option to skip framebuffer clear

[Rob Clark]

The use-case is that the thing that loaded u-boot already put a splash
image on screen.  And we want to preserve that until grub boot menu
takes over.

Signed-off-by: Rob Clark <robdclark@gmail.com>
---
 drivers/video/Kconfig        | 8 ++++++++
 drivers/video/cfb_console.c  | 3 ++-
 drivers/video/video-uclass.c | 4 +++-
 3 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index 8eb0359231..7b56b20344 100644
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -98,6 +98,14 @@ config SYS_WHITE_ON_BLACK
 	 better in low-light situations or to reduce eye strain in some
 	 cases.
 
+config NO_FB_CLEAR
+	bool "Skip framebuffer clear"
+	help
+	  If firmware (whatever loads u-boot) has already put a splash image
+	  on screen, you might want to preserve it until whatever u-boots
+	  loads takes over the screen.  This, for example, can be used to
+	  keep splash image on screen until grub graphical boot menu starts.
+
 source "drivers/video/fonts/Kconfig"
 
 config VIDCONSOLE_AS_LCD
diff --git a/drivers/video/cfb_console.c b/drivers/video/cfb_console.c
index f54802052e..85fa5b0cae 100644
--- a/drivers/video/cfb_console.c
+++ b/drivers/video/cfb_console.c
@@ -2091,7 +2091,8 @@ static int cfg_video_init(void)
 	}
 	eorx = fgx ^ bgx;
 
-	video_clear();
+	if (!CONFIG_IS_ENABLED(NO_FB_CLEAR))
+		video_clear();
 
 #ifdef CONFIG_VIDEO_LOGO
 	/* Plot the logo and get start point of console */
diff --git a/drivers/video/video-uclass.c b/drivers/video/video-uclass.c
index 3036e3a1f2..dfa39b0d1b 100644
--- a/drivers/video/video-uclass.c
+++ b/drivers/video/video-uclass.c
@@ -199,7 +199,9 @@ static int video_post_probe(struct udevice *dev)
 #else
 	priv->colour_bg = 0xffffff;
 #endif
-	video_clear(dev);
+
+	if (!CONFIG_IS_ENABLED(NO_FB_CLEAR))
+		video_clear(dev);
 
 	/*
 	 * Create a text console device. For now we always do this, although
-- 
2.13.0

[U-Boot] [PATCH 1/3] dm: core: also parse chosen node

[Simon Glass]

Hi Rob,

On 3 August 2017 at 10:46, Rob Clark <robdclark@gmail.com> wrote:
> This is the node that would contain, for example, the framebuffer setup
> by an earlier stage.
>
> Signed-off-by: Rob Clark <robdclark@gmail.com>
> ---
>  drivers/core/root.c | 22 +++++++++++++++++++++-
>  1 file changed, 21 insertions(+), 1 deletion(-)

Please can you add one to test.dts and add a sandbox test for it?

>
> diff --git a/drivers/core/root.c b/drivers/core/root.c
> index d691d6ff94..5e6b2da248 100644
> --- a/drivers/core/root.c
> +++ b/drivers/core/root.c
> @@ -266,6 +266,26 @@ static int dm_scan_fdt_node(struct udevice *parent, const void *blob,
>         for (offset = fdt_first_subnode(blob, offset);
>              offset > 0;
>              offset = fdt_next_subnode(blob, offset)) {
> +               ofnode node = offset_to_ofnode(offset);
> +
> +               /* "chosen" node isn't a device itself but may contain some: */
> +               if (strcmp(ofnode_get_name(node), "chosen") == 0) {

!strcmp()

> +                       dm_dbg("parsing subnodes of \"chosen\"\n");
> +
> +                       for (node = ofnode_first_subnode(node);
> +                            ofnode_valid(node);
> +                            node = ofnode_next_subnode(node)) {
> +                               dm_dbg("subnode: %s\n", ofnode_get_name(node));
> +                               err = lists_bind_fdt(parent, node, NULL);
> +                               if (err && !ret) {
> +                                       ret = err;
> +                                       dm_dbg("%s: ret=%d\n", ofnode_get_name(node), ret);
> +                               }
> +                       }
> +
> +                       continue;
> +               }
> +
>                 if (pre_reloc_only &&
>                     !dm_fdt_pre_reloc(blob, offset))
>                         continue;
> @@ -273,7 +293,7 @@ static int dm_scan_fdt_node(struct udevice *parent, const void *blob,
>                         dm_dbg("   - ignoring disabled device\n");
>                         continue;
>                 }
> -               err = lists_bind_fdt(parent, offset_to_ofnode(offset), NULL);
> +               err = lists_bind_fdt(parent, node, NULL);
>                 if (err && !ret) {
>                         ret = err;
>                         debug("%s: ret=%d\n", fdt_get_name(blob, offset, NULL),
> --
> 2.13.0
>

Regards,
Simon

[U-Boot] [PATCH 3/3] video: add config option to skip framebuffer clear

[Anatolij Gustschin]

On Thu,  3 Aug 2017 12:47:01 -0400
Rob Clark robdclark at gmail.com wrote:

> The use-case is that the thing that loaded u-boot already put a splash
> image on screen.  And we want to preserve that until grub boot menu
> takes over.
> 
> Signed-off-by: Rob Clark <robdclark@gmail.com>
> ---
>  drivers/video/Kconfig        | 8 ++++++++
>  drivers/video/cfb_console.c  | 3 ++-
>  drivers/video/video-uclass.c | 4 +++-
>  3 files changed, 13 insertions(+), 2 deletions(-)

Applied to u-boot-video/next, thanks!

--
Anatolij

[U-Boot] [PATCH 2/3] video: simplefb

[Anatolij Gustschin]

On Thu,  3 Aug 2017 12:47:00 -0400
Rob Clark robdclark at gmail.com wrote:

> Not really qcom specific, but for now qcom/lk is the one firmware that
> is (afaiu) setting up the appropriate dt node for pre-configured
> display.  Uses the generic simple-framebuffer DT bindings so this should
> be useful on other platforms.
> 
> Signed-off-by: Rob Clark <robdclark@gmail.com>
> ---
>  drivers/video/Kconfig    | 10 +++++++
>  drivers/video/Makefile   |  2 +-
>  drivers/video/simplefb.c | 71 ++++++++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 82 insertions(+), 1 deletion(-)
>  create mode 100644 drivers/video/simplefb.c

Applied to u-boot-video/next, thanks!

--
Anatolij