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Message-ID: <aV1xe09kYUwj4ocm@bywater>
Date: Tue, 6 Jan 2026 21:32:59 +0100
From: Francesco Valla <francesco@...la.it>
To: "Mario Limonciello (AMD) (kernel.org)" <superm1@...nel.org>
Cc: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Maxime Ripard <mripard@...nel.org>,
Thomas Zimmermann <tzimmermann@...e.de>,
David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
Jonathan Corbet <corbet@....net>,
Jocelyn Falempe <jfalempe@...hat.com>,
Javier Martinez Canillas <javierm@...hat.com>,
Sam Ravnborg <sam@...nborg.org>, linux-kernel@...r.kernel.org,
dri-devel@...ts.freedesktop.org, linux-doc@...r.kernel.org,
linux-embedded@...r.kernel.org
Subject: Re: [PATCH RFC v2 1/3] drm: client: add splash client
Hello Mario,
On Tue, Jan 06, 2026 at 12:58:28PM -0600, Mario Limonciello (AMD) (kernel.org) wrote:
>
>
> On 1/6/2026 8:25 AM, Francesco Valla wrote:
> > Add a DRM client that draws a simple splash, with possibility to show:
> >
> > - a colored background;
> > - a static BMP image (loaded as firmware);
> > - the logo provided by EFI BGRT.
>
> That's cool, thanks for implementing my suggestion!
>
> >
> > The client is not meant to replace a full-featured bootsplash, but
> > rather to remove some complexity (and hopefully boot time) on small
> > embedded platforms or on systems with a limited scope (e.g: recovery
> > or manufacturing images).
>
> In theory when using EFI BGRT you could:
> * have the BIOS show the BGRT
> * bootloader not show anything
> * kernel overwrite the framebuffer containing the BIOS BGRT with the exact
> same image (should be invisible to the user)
> * regular bootsplash like plymouth overwrite the framebuffer again with the
> same BGRT but then also add progress bar/distro logo etc.
>
Yes, that's the idea. I am still searching a EFI-enabled platform I can
perform some proper tests on, as I'm not really familiar with EFI.
This version was tested with OVMF on QEMU, but without a real userspace.
> >
> > The background color can be set either at build time from a dedicated
> > config option or at runtime through the drm_client_lib.splash_color
> > command line parameter. Any color in RGB888 format can be used.
> >
> > If enabled, the static BMP image is loaded using the kernel firmware
> > infrastructure; a valid BMP image with 24bpp color and no compression
> > is expected. The name of the image can be set through the
> > drm_client_lib.splash_bmp kernel command line parameter, with the
> > default being 'drm_splash.bmp'.
> >
> > Just like the existing DRM clients, the splash can be enabled from the
> > kernel command line using drm_client_lib.active=splash.
> >
> > Signed-off-by: Francesco Valla <francesco@...la.it>
> > ---
> > drivers/gpu/drm/clients/Kconfig | 79 ++-
> > drivers/gpu/drm/clients/Makefile | 1 +
> > drivers/gpu/drm/clients/drm_client_internal.h | 9 +
> > drivers/gpu/drm/clients/drm_client_setup.c | 8 +
> > drivers/gpu/drm/clients/drm_splash.c | 883 ++++++++++++++++++++++++++
> > 5 files changed, 979 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/gpu/drm/clients/Kconfig b/drivers/gpu/drm/clients/Kconfig
> > index 6096c623d9d5b1a3d4a40d986c45aad2f8277767..dd8cd6cacd1166932eb3890dd816b9ae2d26330f 100644
> > --- a/drivers/gpu/drm/clients/Kconfig
> > +++ b/drivers/gpu/drm/clients/Kconfig
> > @@ -12,6 +12,7 @@ config DRM_CLIENT_LIB
> > config DRM_CLIENT_SELECTION
> > tristate
> > depends on DRM
> > + select DRM_CLIENT_LIB if DRM_CLIENT_SPLASH
> > select DRM_CLIENT_LIB if DRM_CLIENT_LOG
> > select DRM_CLIENT_LIB if DRM_FBDEV_EMULATION
> > help
> > @@ -85,10 +86,79 @@ config DRM_CLIENT_LOG
> > If you only need logs, but no terminal, or if you prefer userspace
> > terminal, say "Y".
> > +config DRM_CLIENT_SPLASH
> > + bool "Display graphic splash"
> > + depends on DRM_CLIENT_SELECTION
> > + select DRM_CLIENT
> > + select DRM_CLIENT_SETUP
> > + select DRM_DRAW
> > + help
> > + This enables a splash drm client, able to display either a plain
> > + color or a static image until the userspace is ready to take over.
> > + The splash will be displayed on all screens available at boot, if
> > + any, or on the ones part of the first hotplug event.
> > +
> > +config DRM_CLIENT_SPLASH_BACKGROUND_COLOR
> > + hex "Splash background color"
> > + depends on DRM_CLIENT_SPLASH
> > + default 0x000000
> > + help
> > + The default splash background color, in RGB888 format.
> > +
> > + The color can be overridden through the drm_client_lib.splash_color
> > + kernel command line parameter.
> > +
> > +config DRM_CLIENT_SPLASH_BMP_SUPPORT
> > + bool
> > +
> > +choice
> > + prompt "Splash source"
> > + depends on DRM_CLIENT_SPLASH
> > + default DRM_CLIENT_SPLASH_SRC_COLOR
> > + help
> > + Selects the source for the splash graphic.
> > +
> > +config DRM_CLIENT_SPLASH_SRC_COLOR
> > + bool "Solid color"
> > + help
> > + Use a solid color as splash. The color is selected through the
> > + DRM_CLIENT_SPLASH_BACKGROUND_COLOR config option.
> > +
> > + The image will be loaded using the firmware loading facility the
> > + kernel provides.
> > +
> > +config DRM_CLIENT_SPLASH_SRC_BMP
> > + bool "BMP image"
> > + select DRM_CLIENT_SPLASH_BMP_SUPPORT
> > + select FW_LOADER
> > + help
> > + Use a BMP (bitmap) image as splash. If the image is smaller than the
> > + display(s), it will be centered and the color specified through the
> > + DRM_CLIENT_SPLASH_BACKGROUND_COLOR config option will be used as
> > + background.
> > +
> > + The image will be loaded using the firmware loading facility the
> > + kernel provides; it shall use 24 bits per pixel and shall not be
> > + compressed. The name of the file can be set through the
> > + drm_client_lib.splash_bmp command line parameter, with the default
> > + being 'drm_splash.bmp'.
> > +
> > +config DRM_CLIENT_SPLASH_SRC_BGRT
> > + bool "EFI BGRT"
> > + select DRM_CLIENT_SPLASH_BMP_SUPPORT
> > + depends on EFI
> > + help
> > + Use the BGRT image provided by the EFI bootloader. If the image is
> > + smaller than the display(s), it will be centered and the color
> > + specified through the DRM_CLIENT_SPLASH_BACKGROUND_COLOR config
> > + option will be used as background.
> > +
> > +endchoice
> > +
> > choice
> > prompt "Default DRM Client"
> > depends on DRM_CLIENT_SELECTION
> > - depends on DRM_FBDEV_EMULATION || DRM_CLIENT_LOG
> > + depends on DRM_FBDEV_EMULATION || DRM_CLIENT_LOG || DRM_CLIENT_SPLASH
> > default DRM_CLIENT_DEFAULT_FBDEV
> > help
> > Selects the default drm client.
> > @@ -111,6 +181,12 @@ config DRM_CLIENT_DEFAULT_LOG
> > screen, but doesn't implement a full terminal. For that you will need
> > a userspace terminal using drm/kms.
> > +config DRM_CLIENT_DEFAULT_SPLASH
> > + bool "splash"
> > + depends on DRM_CLIENT_SPLASH
> > + help
> > + Use splash as default drm client.
> > +
> > endchoice
> > config DRM_CLIENT_DEFAULT
> > @@ -118,6 +194,7 @@ config DRM_CLIENT_DEFAULT
> > depends on DRM_CLIENT
> > default "fbdev" if DRM_CLIENT_DEFAULT_FBDEV
> > default "log" if DRM_CLIENT_DEFAULT_LOG
> > + default "splash" if DRM_CLIENT_DEFAULT_SPLASH
>
> Whitespace off by a character?
>
No, the entire 'config DRM_CLIENT_DEFAULT' block uses spaces instead of
tabulations. I might send a dedicated patch to fix just that.
> > default ""
> > endmenu
> > diff --git a/drivers/gpu/drm/clients/Makefile b/drivers/gpu/drm/clients/Makefile
> > index c16addbc327f09572aa3142cbf0d1d13f172a9e9..3df02d10cd18a47d7e8d7cee70163b0ef0129b51 100644
> > --- a/drivers/gpu/drm/clients/Makefile
> > +++ b/drivers/gpu/drm/clients/Makefile
> > @@ -5,4 +5,5 @@ subdir-ccflags-y += -I$(src)/..
> > drm_client_lib-y := drm_client_setup.o
> > drm_client_lib-$(CONFIG_DRM_CLIENT_LOG) += drm_log.o
> > drm_client_lib-$(CONFIG_DRM_FBDEV_EMULATION) += drm_fbdev_client.o
> > +drm_client_lib-$(CONFIG_DRM_CLIENT_SPLASH) += drm_splash.o
> > obj-$(CONFIG_DRM_CLIENT_LIB) += drm_client_lib.o
> > diff --git a/drivers/gpu/drm/clients/drm_client_internal.h b/drivers/gpu/drm/clients/drm_client_internal.h
> > index 6dc078bf6503b902cbb3267b64ea42d9f1c23375..48ee0c1c2529882b2bf5dc786788390823e25cd6 100644
> > --- a/drivers/gpu/drm/clients/drm_client_internal.h
> > +++ b/drivers/gpu/drm/clients/drm_client_internal.h
> > @@ -22,4 +22,13 @@ void drm_log_register(struct drm_device *dev);
> > static inline void drm_log_register(struct drm_device *dev) {}
> > #endif
> > +#ifdef CONFIG_DRM_CLIENT_SPLASH
> > +void drm_splash_register(struct drm_device *dev,
> > + const struct drm_format_info *format);
> > +#else
> > +static inline void drm_splash_register(struct drm_device *dev,
> > + const struct drm_format_info *format)
> > +{}
> > +#endif
> > +
> > #endif
> > diff --git a/drivers/gpu/drm/clients/drm_client_setup.c b/drivers/gpu/drm/clients/drm_client_setup.c
> > index 515aceac22b18161a14bd60be4acedc1ddd05bc5..c19498938ee3ba442f7502b27a9c33dfff45a203 100644
> > --- a/drivers/gpu/drm/clients/drm_client_setup.c
> > +++ b/drivers/gpu/drm/clients/drm_client_setup.c
> > @@ -56,6 +56,14 @@ void drm_client_setup(struct drm_device *dev, const struct drm_format_info *form
> > return;
> > }
> > #endif
> > +
> > +#ifdef CONFIG_DRM_CLIENT_SPLASH
> > + if (!strcmp(drm_client_default, "splash")) {
> > + drm_splash_register(dev, format);
> > + return;
> > + }
> > +#endif
> > +
> > if (strcmp(drm_client_default, ""))
> > drm_warn(dev, "Unknown DRM client %s\n", drm_client_default);
> > }
> > diff --git a/drivers/gpu/drm/clients/drm_splash.c b/drivers/gpu/drm/clients/drm_splash.c
> > new file mode 100644
> > index 0000000000000000000000000000000000000000..204a5256ef03b6edb81e5dc8c49b5929cb51ff92
> > --- /dev/null
> > +++ b/drivers/gpu/drm/clients/drm_splash.c
> > @@ -0,0 +1,883 @@
> > +// SPDX-License-Identifier: GPL-2.0 or MIT
> > +/*
> > + * Copyright (c) 2025-2026 Francesco Valla <francesco@...la.it>
> > + *
> > + */
> > +
> > +#include <linux/atomic.h>
> > +#include <linux/device.h>
> > +#include <linux/efi-bgrt.h>
> > +#include <linux/firmware.h>
> > +#include <linux/init.h>
> > +#include <linux/iosys-map.h>
> > +#include <linux/kthread.h>
> > +#include <linux/module.h>
> > +#include <linux/types.h>
> > +
> > +#include <drm/drm_client.h>
> > +#include <drm/drm_drv.h>
> > +#include <drm/drm_fourcc.h>
> > +#include <drm/drm_framebuffer.h>
> > +#include <drm/drm_plane.h>
> > +#include <drm/drm_print.h>
> > +
> > +#include "drm_client_internal.h"
> > +#include "drm_draw_internal.h"
> > +#include "drm_internal.h"
> > +
> > +/**
> > + * DOC: overview
> > + *
> > + * This is a simple graphic bootsplash, able to display either a plain color or
> > + * a static image.
> > + */
> > +
> > +static unsigned int splash_color = CONFIG_DRM_CLIENT_SPLASH_BACKGROUND_COLOR;
> > +module_param(splash_color, uint, 0400);
> > +MODULE_PARM_DESC(splash_color, "Splash background color (RGB888)");
>
> Does this really need to be a module parameter(s) in addition to the kconfig
> option(s)? Just wondering what the use case you envisioned is. In my mind I
> was thinking in an embedded system manufacturing flow maybe you would set it
> to red in the case of a hardware test failure on the line or something.
>
My usecase is slightly different: a single BSP (bootloader + kernel +
rootfs) for multiple devices belonging to the same family, each one with
its own splash logo. The device detection would be done by the
bootloader (using an EEPROM parameter) and propagated to the built-in
splash client through command line options.
Q: Why not only the BMP logo, then?
A: Because the logo itself is not a square, and each logo flavor has its
own background color.
> > +
> > +#if IS_ENABLED(CONFIG_DRM_CLIENT_SPLASH_SRC_BMP)
> > +#define DEFAULT_SPLASH_BMP "drm_splash.bmp"
> > +static char *splash_bmp = DEFAULT_SPLASH_BMP;
> > +module_param(splash_bmp, charp, 0400);
> > +MODULE_PARM_DESC(splash_bmp, "Name of splash image (default: \"" DEFAULT_SPLASH_BMP "\")");
> > +#endif // CONFIG_DRM_CLIENT_SPLASH_SRC_BMP
> > +
> > +#if IS_ENABLED(CONFIG_DRM_CLIENT_SPLASH_BMP_SUPPORT)
> > +#define BMP_FILE_MAGIC_ID 0x4d42
> > +
> > +/* BMP header structures copied from drivers/video/fbdev/efifb.c */
> > +struct bmp_file_header {
> > + u16 id;
> > + u32 file_size;
> > + u32 reserved;
> > + u32 bitmap_offset;
> > +} __packed;
> > +
> > +struct bmp_dib_header {
> > + u32 dib_header_size;
> > + s32 width;
> > + s32 height;
> > + u16 planes;
> > + u16 bpp;
> > + u32 compression;
> > + u32 bitmap_size;
> > + u32 horz_resolution;
> > + u32 vert_resolution;
> > + u32 colors_used;
> > + u32 colors_important;
> > +} __packed;
> > +#endif // CONFIG_DRM_CLIENT_SPLASH_BMP_SUPPORT
> > +
> > +typedef int (*drm_splash_data_get_func_t)(void *priv, const u8 **data, size_t *size);
> > +typedef void (*drm_splash_data_release_func_t)(void *priv);
> > +
> > +struct drm_splash_scanout {
> > + int id;
> > + u32 format;
> > + unsigned int width;
> > + unsigned int height;
> > + struct drm_client_buffer *buffer;
> > + bool bg_drawn;
> > +};
> > +
> > +struct drm_splash {
> > + struct drm_client_dev client;
> > + u32 preferred_format;
> > + struct device dev;
> > +
> > + struct task_struct *thread;
> > + atomic_t pending;
> > +
> > + struct mutex hotplug_lock;
> > + bool initialized;
> > +
> > + u32 n_scanout;
> > + struct drm_splash_scanout *scanout;
> > +
> > + spinlock_t data_lock;
> > + drm_splash_data_get_func_t data_get;
> > + drm_splash_data_release_func_t data_release;
> > + void *data_priv;
> > +};
> > +
> > +static struct drm_splash *client_to_drm_splash(struct drm_client_dev *client)
> > +{
> > + return container_of_const(client, struct drm_splash, client);
> > +}
> > +
> > +static void __maybe_unused
> > +drm_splash_data_source_push(struct drm_splash *splash,
> > + drm_splash_data_get_func_t get,
> > + drm_splash_data_release_func_t release,
> > + void *priv)
> > +{
> > + guard(spinlock)(&splash->data_lock);
> > +
> > + /* Release previous data */
> > + if (splash->data_release)
> > + splash->data_release(splash->data_priv);
> > +
> > + splash->data_get = get;
> > + splash->data_release = release;
> > + splash->data_priv = priv;
> > +}
> > +
> > +static void drm_splash_data_source_pop(struct drm_splash *splash,
> > + drm_splash_data_get_func_t *get,
> > + drm_splash_data_release_func_t *release,
> > + void **priv)
> > +{
> > + guard(spinlock)(&splash->data_lock);
> > +
> > + *get = splash->data_get;
> > + splash->data_get = NULL;
> > +
> > + *release = splash->data_release;
> > + splash->data_release = NULL;
> > +
> > + *priv = splash->data_priv;
> > + splash->data_priv = NULL;
> > +}
> > +
> > +static struct drm_splash_scanout *
> > +get_scanout_from_tile_group(struct drm_splash *splash, int id)
> > +{
> > + int j;
> > +
> > + for (j = 0; j < splash->n_scanout; j++)
> > + if (splash->scanout[j].id == id)
> > + return &splash->scanout[j];
> > +
> > + return NULL;
> > +}
> > +
> > +static u32 drm_splash_find_usable_format(struct drm_plane *plane,
> > + u32 preferred_format)
> > +{
> > + int i;
> > +
> > + /* Check if the preferred format can be used */
> > + for (i = 0; i < plane->format_count; i++)
> > + if (plane->format_types[i] == preferred_format)
> > + return preferred_format;
> > +
> > + /* Otherwise, find the first format that can be converted from XRGB8888 */
> > + for (i = 0; i < plane->format_count; i++)
> > + if (drm_draw_color_from_xrgb8888(0xffffffff, plane->format_types[i]) != 0)
> > + return plane->format_types[i];
> > +
> > + return DRM_FORMAT_INVALID;
> > +}
> > +
> > +static void drm_splash_fill(struct iosys_map *map, unsigned int dst_pitch,
> > + unsigned int height, unsigned int width,
> > + u32 px_width, u32 color)
> > +{
> > + switch (px_width) {
> > + case 2:
> > + drm_draw_fill16(map, dst_pitch, height, width, color);
> > + break;
> > + case 3:
> > + drm_draw_fill24(map, dst_pitch, height, width, color);
> > + break;
> > + case 4:
> > + drm_draw_fill32(map, dst_pitch, height, width, color);
> > + break;
> > + default:
> > + WARN_ONCE(1, "Can't fill with pixel width %d", px_width);
> > + }
> > +}
> > +
> > +static int drm_splash_fill_solid_color(struct drm_client_buffer *buffer, u32 color)
> > +{
> > + struct drm_client_dev *client = buffer->client;
> > + struct drm_framebuffer *fb = buffer->fb;
> > + struct drm_rect r = DRM_RECT_INIT(0, 0, fb->width, fb->height);
> > + u32 px_width = fb->format->cpp[0];
> > + struct iosys_map map;
> > + int ret;
> > +
> > + ret = drm_client_buffer_vmap_local(buffer, &map);
> > + if (ret) {
> > + drm_err(client->dev, "splash: cannot vmap buffer: %d", ret);
> > + return ret;
> > + }
> > +
> > + drm_splash_fill(&map, fb->pitches[0], drm_rect_height(&r),
> > + drm_rect_width(&r), px_width, color);
> > +
> > + drm_client_buffer_vunmap_local(buffer);
> > +
> > + return drm_client_buffer_flush(buffer, &r);
> > +}
> > +
> > +#if IS_ENABLED(CONFIG_DRM_CLIENT_SPLASH_BMP_SUPPORT)
> > +static void drm_splash_blit_pix16(struct iosys_map *map, unsigned int dpitch,
> > + unsigned int x_pad, unsigned int y_pad,
> > + const u8 *sbuf8, unsigned int spitch,
> > + unsigned int width, unsigned int height,
> > + bool invert_y, u32 format)
> > +{
> > + unsigned int x, y, src_offset, dst_offset;
> > + u32 scolor, dcolor, wr_off;
> > +
> > + for (y = 0; y < height; y++) {
> > + src_offset = (invert_y ? (height - y - 1) : y) * spitch;
> > + dst_offset = (y_pad + y) * dpitch;
> > +
> > + for (x = 0; x < width; x++) {
> > + scolor = *(const u32 *)(&sbuf8[src_offset + 3 * x]);
> > + dcolor = drm_draw_color_from_xrgb8888(scolor, format);
> > + wr_off = dst_offset + (x_pad + x) * sizeof(u16);
> > +
> > + iosys_map_wr(map, wr_off, u16, dcolor);
> > + }
> > + }
> > +}
> > +
> > +static void drm_splash_blit_pix24(struct iosys_map *map, unsigned int dpitch,
> > + unsigned int x_pad, unsigned int y_pad,
> > + const u8 *sbuf8, unsigned int spitch,
> > + unsigned int width, unsigned int height,
> > + bool invert_y, u32 format)
> > +{
> > + unsigned int x, y, src_offset, dst_offset;
> > + u32 scolor, dcolor, wr_off;
> > +
> > + for (y = 0; y < height; y++) {
> > + src_offset = (invert_y ? (height - y - 1) : y) * spitch;
> > + dst_offset = (y_pad + y) * dpitch;
> > +
> > + for (x = 0; x < width; x++) {
> > + scolor = *(const u32 *)(&sbuf8[src_offset + 3 * x]);
> > + dcolor = drm_draw_color_from_xrgb8888(scolor, format);
> > + wr_off = dst_offset + (x_pad + x) * 3;
> > +
> > + iosys_map_wr(map, wr_off, u8, (dcolor & 0x000000FF) >> 0);
> > + iosys_map_wr(map, wr_off + 1, u8, (dcolor & 0x0000FF00) >> 8);
> > + iosys_map_wr(map, wr_off + 2, u8, (dcolor & 0x00FF0000) >> 16);
> > + }
> > + }
> > +}
> > +
> > +static void drm_splash_blit_pix32(struct iosys_map *map, unsigned int dpitch,
> > + unsigned int x_pad, unsigned int y_pad,
> > + const u8 *sbuf8, unsigned int spitch,
> > + unsigned int width, unsigned int height,
> > + bool invert_y, u32 format)
> > +{
> > + unsigned int x, y, src_offset, dst_offset;
> > + u32 scolor, dcolor, wr_off;
> > +
> > + for (y = 0; y < height; y++) {
> > + src_offset = (invert_y ? (height - y - 1) : y) * spitch;
> > + dst_offset = (y_pad + y) * dpitch;
> > +
> > + for (x = 0; x < width; x++) {
> > + scolor = *(const u32 *)(&sbuf8[src_offset + 3 * x]);
> > + dcolor = drm_draw_color_from_xrgb8888(scolor, format);
> > + wr_off = dst_offset + (x_pad + x) * sizeof(u32);
> > +
> > + iosys_map_wr(map, wr_off, u32, dcolor);
> > + }
> > + }
> > +}
> > +
> > +static void drm_splash_blit_rgb888(struct iosys_map *map, unsigned int dpitch,
> > + unsigned int x_pad, unsigned int y_pad,
> > + const u8 *sbuf8, unsigned int spitch,
> > + unsigned int width, unsigned int height,
> > + bool invert_y)
> > +{
> > + unsigned int y, src_offset, dst_offset;
> > +
> > + for (y = 0; y < height; y++) {
> > + src_offset = (invert_y ? (height - y - 1) : y) * spitch;
> > + dst_offset = (y_pad + y) * dpitch + x_pad * 3;
> > +
> > + iosys_map_memcpy_to(map, dst_offset, &sbuf8[src_offset], width * 3);
> > + }
> > +}
> > +
> > +static int drm_splash_bmp_to_scanout(struct drm_splash_scanout *scanout,
> > + const u8 *data, size_t data_len)
> > +
> > +{
> > + struct drm_client_buffer *buffer = scanout->buffer;
> > + struct drm_client_dev *client = buffer->client;
> > + struct drm_framebuffer *fb = buffer->fb;
> > + u32 px_width = fb->format->cpp[0];
> > + const struct bmp_file_header *file_header;
> > + const struct bmp_dib_header *dib_header;
> > + u32 bmp_width, bmp_height, bmp_pitch;
> > + bool bmp_invert_y;
> > + unsigned int x_pad, y_pad;
> > + const u8 *image_data;
> > + struct iosys_map map;
> > + struct drm_rect r;
> > + int ret;
> > +
> > + if (data_len < (sizeof(*file_header) + sizeof(*dib_header))) {
> > + drm_err(client->dev, "splash: BMP file too short");
> > + return -EINVAL;
> > + }
> > +
> > + file_header = (const struct bmp_file_header *)data;
> > + if (file_header->id != BMP_FILE_MAGIC_ID) {
> > + drm_err(client->dev, "splash: invalid BMP magic 0x%04X",
> > + file_header->id);
> > + return -EINVAL;
> > + }
> > +
> > + dib_header = (const struct bmp_dib_header *)(data + sizeof(*file_header));
> > +
> > + /* Restrict supported format to uncompressed, 24bit RGB888 */
> > + if (dib_header->dib_header_size != 40 || dib_header->width < 0 ||
> > + dib_header->planes != 1 || dib_header->compression != 0 ||
> > + dib_header->bpp != 24) {
> > + drm_err(client->dev, "splash: invalid BMP format");
> > + return -EINVAL;
> > + }
> > +
> > + bmp_width = dib_header->width;
> > + bmp_height = abs(dib_header->height);
> > + bmp_pitch = round_up(3 * bmp_width, 4);
> > + bmp_invert_y = (dib_header->height > 0);
> > +
> > + if ((file_header->bitmap_offset + bmp_pitch * bmp_height) > data_len) {
> > + drm_err(client->dev, "splash: invalid BMP size");
> > + return -EINVAL;
> > + }
> > +
> > + if (bmp_width > scanout->width || bmp_height > scanout->height) {
> > + drm_err(client->dev, "splash: BMP image is too big for the screen");
> > + return -EINVAL;
> > + }
> > +
> > + image_data = data + file_header->bitmap_offset;
> > +
> > + ret = drm_client_buffer_vmap_local(buffer, &map);
> > + if (ret) {
> > + drm_err(client->dev, "splash: cannot vmap buffer: %d", ret);
> > + return ret;
> > + }
> > +
> > + /* Center X and Y */
> > + x_pad = (scanout->width - bmp_width) / 2;
> > + y_pad = (scanout->height - bmp_height) / 2;
> > + r = DRM_RECT_INIT(x_pad, y_pad, bmp_width, bmp_height);
> > +
> > + /* In case the target format is RGB888, source data can be copied to
> > + * the video buffer line by line, avoiding some overhead.
> > + */
> > + if (scanout->format == DRM_FORMAT_RGB888) {
> > + drm_splash_blit_rgb888(&map, fb->pitches[0], x_pad, y_pad,
> > + image_data, bmp_pitch, bmp_width,
> > + bmp_height, bmp_invert_y);
> > + } else {
> > + switch (px_width) {
> > + case 2:
> > + drm_splash_blit_pix16(&map, fb->pitches[0], x_pad,
> > + y_pad, image_data, bmp_pitch,
> > + bmp_width, bmp_height,
> > + bmp_invert_y, scanout->format);
> > + break;
> > + case 3:
> > + drm_splash_blit_pix24(&map, fb->pitches[0], x_pad,
> > + y_pad, image_data, bmp_pitch,
> > + bmp_width, bmp_height,
> > + bmp_invert_y, scanout->format);
> > + break;
> > + case 4:
> > + drm_splash_blit_pix32(&map, fb->pitches[0], x_pad,
> > + y_pad, image_data, bmp_pitch,
> > + bmp_width, bmp_height,
> > + bmp_invert_y, scanout->format);
> > + break;
> > + default:
> > + drm_warn_once(client->dev,
> > + "splash: can't blit with pixel width %d",
> > + px_width);
> > + }
> > + }
> > +
> > + drm_client_buffer_vunmap_local(buffer);
> > +
> > + return drm_client_buffer_flush(buffer, &r);
> > +}
> > +#else
> > +static inline int drm_splash_bmp_to_scanout(struct drm_splash_scanout *scanout,
> > + const u8 *data, size_t data_len)
> > +{
> > + return -EOPNOTSUPP;
> > +}
> > +#endif
> > +
> > +static int drm_splash_draw_scanout(struct drm_splash *splash,
> > + struct drm_splash_scanout *scanout,
> > + const u8 *data, size_t data_len)
> > +{
> > + if (!scanout->buffer)
> > + return -ENODEV;
> > +
> > + if (!scanout->bg_drawn) {
> > + u32 color = drm_draw_color_from_xrgb8888(splash_color,
> > + scanout->format);
> > + drm_splash_fill_solid_color(scanout->buffer, color);
> > + scanout->bg_drawn = true;
> > + }
> > +
> > + if (data != NULL) {
> > + /* Ignore the return value, since the solid color has already
> > + * been drawn to screen.
> > + */
> > + drm_splash_bmp_to_scanout(scanout, data, data_len);
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +static int drm_splash_render_thread(void *data)
> > +{
> > + struct drm_splash *splash = data;
> > + struct drm_client_dev *client = &splash->client;
> > +
> > + while (!kthread_should_stop()) {
> > + unsigned int draw_count = 0;
> > + drm_splash_data_get_func_t get_fn = NULL;
> > + drm_splash_data_release_func_t release_fn = NULL;
> > + void *priv = NULL;
> > + const u8 *img_data = NULL;
> > + size_t img_data_len = 0;
> > + int i, ret;
> > +
> > + drm_splash_data_source_pop(splash, &get_fn, &release_fn, &priv);
> > +
> > + if (get_fn) {
> > + ret = get_fn(priv, &img_data, &img_data_len);
> > + if (ret) {
> > + drm_err(client->dev,
> > + "splash: failed to get image data: %d",
> > + ret);
> > + }
> > + }
> > +
> > + for (i = 0; i < splash->n_scanout; i++) {
> > + ret = drm_splash_draw_scanout(splash,
> > + &splash->scanout[i],
> > + img_data, img_data_len);
> > + if (ret) {
> > + drm_err(client->dev,
> > + "splash: failed to fill scanout %d: %d",
> > + i, ret);
> > + continue;
> > + }
> > +
> > + draw_count++;
> > + }
> > +
> > + if (release_fn)
> > + release_fn(priv);
> > +
> > + if (draw_count > 0) {
> > + ret = drm_client_modeset_commit(client);
> > + /* If commit returns EBUSY, another master showed up.
> > + * This means that the splash is no more required.
> > + */
> > + if (ret == -EBUSY) {
> > + drm_info(client->dev,
> > + "splash: not master anymore, exiting");
> > + break;
> > + }
> > + }
> > +
> > + /* If no changes arrived in the mean time, wait to be awaken,
> > + * e.g.by a firmware callback.
> > + */
> > + if (atomic_xchg(&splash->pending, 0) == 0)
> > + set_current_state(TASK_UNINTERRUPTIBLE);
> > +
> > + schedule();
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +static inline void drm_splash_wake_render_thread(struct drm_splash *splash)
> > +{
> > + atomic_set(&splash->pending, 1);
> > + wake_up_process(splash->thread);
> > +}
> > +
> > +#if IS_ENABLED(CONFIG_DRM_CLIENT_SPLASH_SRC_BMP)
> > +static int drm_splash_fw_get(void *priv, const u8 **data, size_t *size)
> > +{
> > + const struct firmware *fw = priv;
> > +
> > + if (!fw)
> > + return -ENODATA;
> > +
> > + *data = fw->data;
> > + *size = fw->size;
> > +
> > + return 0;
> > +}
> > +
> > +static void drm_splash_fw_release(void *priv)
> > +{
> > + const struct firmware *fw = priv;
> > +
> > + if (fw)
> > + release_firmware(fw);
> > +}
> > +
> > +static void drm_splash_fw_callback(const struct firmware *fw, void *context)
> > +{
> > + struct drm_splash *splash = context;
> > + struct drm_client_dev *client = &splash->client;
> > +
> > + if (!fw || !fw->data) {
> > + drm_err(client->dev, "splash: no firmware");
> > + return;
> > + }
> > +
> > + drm_splash_data_source_push(splash, drm_splash_fw_get,
> > + drm_splash_fw_release, (void *)fw);
> > +
> > + /* Wake the render thread */
> > + drm_dbg(client->dev, "splash: firmware loaded, wake up drawing thread");
> > + drm_splash_wake_render_thread(splash);
> > +}
> > +
> > +static int drm_splash_fw_request_bmp(struct drm_splash *splash)
> > +{
> > + struct drm_client_dev *client = &splash->client;
> > +
> > + drm_info(client->dev, "splash: request %s as firmware", splash_bmp);
> > +
> > + return request_firmware_nowait(THIS_MODULE, FW_ACTION_UEVENT,
> > + splash_bmp, client->dev->dev, GFP_KERNEL,
> > + splash, drm_splash_fw_callback);
> > +}
> > +#else
> > +static inline int drm_splash_fw_request_bmp(struct drm_splash *splash)
> > +{
> > + return -EOPNOTSUPP;
> > +}
> > +#endif // CONFIG_DRM_CLIENT_SPLASH_SRC_BMP
> > +
> > +#if IS_ENABLED(CONFIG_DRM_CLIENT_SPLASH_SRC_BGRT)
> > +static int drm_splash_bgrt_get_data(void *priv, const u8 **data, size_t *size)
> > +{
> > + void *bgrt_image = priv;
> > +
> > + *data = bgrt_image;
> > + *size = bgrt_image_size;
> > +
> > + return 0;
> > +}
> > +
> > +static void drm_splash_bgrt_release(void *priv)
> > +{
> > + void *bgrt_image = priv;
> > +
> > + if (bgrt_image)
> > + memunmap(bgrt_image);
> > +}
> > +
> > +static int drm_splash_bgrt_load(struct drm_splash *splash)
> > +{
> > + struct drm_client_dev *client = &splash->client;
> > + void *bgrt_image = NULL;
> > +
> > + drm_info(client->dev, "splash: using EFI BGRT");
> > +
> > + if (!bgrt_tab.image_address) {
> > + drm_info(client->dev, "splash: no BGRT found");
> > + return -ENOENT;
> > + }
> > +
> > + if (bgrt_tab.status & 0x06) {
> > + drm_info(client->dev, "splash: BGRT rotation bits set, skipping");
> > + return -EOPNOTSUPP;
> > + }
> > +
> > + drm_dbg(client->dev, "splash: BGRT image is at 0x%016llx, size=%zX",
> > + bgrt_tab.image_address, bgrt_image_size);
> > +
> > + bgrt_image = memremap(bgrt_tab.image_address, bgrt_image_size,
> > + MEMREMAP_WB);
> > + if (!bgrt_image) {
> > + drm_warn(client->dev, "splash: failed to map BGRT image memory");
> > + return -ENOMEM;
> > + }
> > +
> > + drm_splash_data_source_push(splash, drm_splash_bgrt_get_data,
> > + drm_splash_bgrt_release, bgrt_image);
> > +
> > + drm_splash_wake_render_thread(splash);
> > +
> > + return 0;
> > +}
> > +#else
> > +static inline int drm_splash_bgrt_load(struct drm_splash *splash)
> > +{
> > + return -EOPNOTSUPP;
> > +}
> > +#endif // CONFIG_DRM_CLIENT_SPLASH_SRC_BGRT
> > +
> > +static int drm_splash_init_client(struct drm_splash *splash)
> > +{
> > + struct drm_client_dev *client = &splash->client;
> > + struct drm_mode_set *modeset;
> > + unsigned int modeset_mask = 0;
> > + unsigned int fb_count = 0;
> > + int j;
> > +
> > + if (drm_client_modeset_probe(client, 0, 0))
> > + return -1;
> > +
> > + j = 0;
> > + drm_client_for_each_modeset(modeset, client) {
> > + struct drm_splash_scanout *tmp;
> > + struct drm_splash_scanout *scanout;
> > + u32 format;
> > + int id = -1;
> > +
> > + /* Skip modesets without a mode */
> > + if (!modeset->mode)
> > + continue;
> > +
> > + if (modeset->connectors[0]->has_tile) {
> > + struct drm_splash_scanout *tiled;
> > + int new_id = modeset->connectors[0]->tile_group->id;
> > +
> > + /* Tiled modesets contribute to a single framebuffer,
> > + * check if this tiled group has already been seen.
> > + */
> > + tiled = get_scanout_from_tile_group(splash, new_id);
> > + if (tiled != NULL) {
> > + if (!modeset->x)
> > + tiled->width += modeset->mode->vdisplay;
> > + if (!modeset->y)
> > + tiled->height += modeset->mode->hdisplay;
> > + modeset->fb = tiled->buffer->fb;
> > + continue;
> > + }
> > +
> > + /* New tile group, save its ID for later */
> > + id = new_id;
> > + }
> > +
> > + format = drm_splash_find_usable_format(modeset->crtc->primary,
> > + splash->preferred_format);
> > + if (format == DRM_FORMAT_INVALID) {
> > + drm_warn(client->dev,
> > + "splash: can't find a usable format for modeset");
> > + continue;
> > + }
> > +
> > + tmp = krealloc(splash->scanout,
> > + (splash->n_scanout + 1) * sizeof(*splash->scanout),
> > + GFP_KERNEL);
> > + if (!tmp) {
> > + drm_warn(client->dev,
> > + "splash: can't reallocate the scanout array");
> > + break;
> > + }
> > +
> > + splash->scanout = tmp;
> > + scanout = &splash->scanout[splash->n_scanout];
> > + splash->n_scanout++;
> > +
> > + memset(scanout, 0, sizeof(*scanout));
> > + scanout->id = id;
> > + scanout->format = format;
> > + scanout->width = modeset->mode->hdisplay;
> > + scanout->height = modeset->mode->vdisplay;
> > +
> > + modeset_mask |= BIT(j);
> > + j++;
> > + }
> > +
> > + /* Now that all sensible modesets have been collected, allocate buffers */
> > + j = 0;
> > + drm_client_for_each_modeset(modeset, client) {
> > + struct drm_splash_scanout *scanout;
> > +
> > + if (!(modeset_mask & BIT(j)))
> > + continue;
> > +
> > + scanout = &splash->scanout[j];
> > + j++;
> > +
> > + scanout->buffer = drm_client_buffer_create_dumb(client,
> > + scanout->width,
> > + scanout->height,
> > + scanout->format);
> > + if (IS_ERR(scanout->buffer)) {
> > + drm_warn(client->dev,
> > + "splash: can't create dumb buffer %d %d %p4cc",
> > + scanout->width, scanout->height, &scanout->format);
> > + continue;
> > + }
> > +
> > + drm_info(client->dev, "splash: created dumb buffer %d %d %p4cc",
> > + scanout->width, scanout->height, &scanout->format);
> > +
> > + modeset->fb = scanout->buffer->fb;
> > + fb_count++;
> > + }
> > +
> > + return (fb_count == 0) ? -ENODEV : 0;
> > +}
> > +
> > +static void drm_splash_free_scanout(struct drm_client_dev *client)
> > +{
> > + struct drm_splash *splash = client_to_drm_splash(client);
> > + int i;
> > +
> > + if (splash->n_scanout) {
> > + for (i = 0; i < splash->n_scanout; i++)
> > + drm_client_buffer_delete(splash->scanout[i].buffer);
> > +
> > + splash->n_scanout = 0;
> > + kfree(splash->scanout);
> > + splash->scanout = NULL;
> > + }
> > +}
> > +
> > +static int drm_splash_client_hotplug(struct drm_client_dev *client)
> > +{
> > + struct drm_splash *splash = client_to_drm_splash(client);
> > + int ret;
> > +
> > + guard(mutex)(&splash->hotplug_lock);
> > +
> > + /* The modesets that get a splash are defined at first hotplug event */
> > + if (splash->initialized)
> > + return 0;
> > +
> > + ret = drm_splash_init_client(splash);
> > + if (ret == -ENODEV) {
> > + drm_info(client->dev, "splash: no modeset found");
> > + return 0;
> > + } else if (ret) {
> > + drm_err(client->dev,
> > + "splash: failed to init client: %d", ret);
> > + return ret;
> > + }
> > +
> > + /* Create the render thread, waken later */
> > + splash->thread = kthread_create(drm_splash_render_thread,
> > + splash, "drm_splash_%s",
> > + client->dev->unique);
> > + if (IS_ERR(splash->thread)) {
> > + ret = PTR_ERR(splash->thread);
> > + drm_err(client->dev, "splash: failed to create render thread: %d", ret);
> > + drm_splash_free_scanout(client);
> > + return ret;
> > + }
> > +
> > + if (IS_ENABLED(CONFIG_DRM_CLIENT_SPLASH_SRC_BMP))
> > + ret = drm_splash_fw_request_bmp(splash);
> > + else if (IS_ENABLED(CONFIG_DRM_CLIENT_SPLASH_SRC_BGRT))
> > + ret = drm_splash_bgrt_load(splash);
>
> I'm not sure this logic will actually work in this order.
> CONFIG_DRM_CLIENT_SPLASH_SRC_BGRT selects
> CONFIG_DRM_CLIENT_SPLASH_SRC_BMP
>
> So won't the BGRT path never run?
>
Actually, CONFIG_DRM_CLIENT_SPLASH_SRC_BGRT selects
CONFIG_DRM_CLIENT_SPLASH_BMP_SUPPORT, which builds the bitmap file
format support shared by both the bmp-as-a-firmware and BGRT "backends".
> > + else
> > + ret = 0;
> > +
> > + if (ret) {
> > + drm_err(client->dev, "splash: failed to kick image load: %d", ret);
> > + kthread_stop(splash->thread);
> > + drm_splash_free_scanout(client);
> > + return ret;
> > + }
> > +
> > + /* Wake the render thread to show initial contents */
> > + drm_splash_wake_render_thread(splash);
> > +
> > + splash->initialized = true;
> > +
> > + return 0;
> > +}
> > +
> > +static int drm_splash_client_restore(struct drm_client_dev *client, bool force)
> > +{
> > + int ret;
> > +
> > + if (force)
> > + ret = drm_client_modeset_commit_locked(client);
> > + else
> > + ret = drm_client_modeset_commit(client);
> > +
> > + return ret;
> > +}
> > +
> > +static void drm_splash_client_unregister(struct drm_client_dev *client)
> > +{
> > + struct drm_splash *splash = client_to_drm_splash(client);
> > +
> > + kthread_stop(splash->thread);
> > + drm_splash_free_scanout(client);
> > + drm_client_release(client);
> > +
> > + if (splash->data_release)
> > + splash->data_release(splash->data_priv);
> > +}
> > +
> > +static void drm_splash_client_free(struct drm_client_dev *client)
> > +{
> > + struct drm_splash *splash = client_to_drm_splash(client);
> > + struct drm_device *dev = client->dev;
> > +
> > + mutex_destroy(&splash->hotplug_lock);
> > + kfree(splash);
> > +
> > + drm_dbg(dev, "Unregistered with drm splash");
> > +}
> > +
> > +static const struct drm_client_funcs drm_splash_client_funcs = {
> > + .owner = THIS_MODULE,
> > + .hotplug = drm_splash_client_hotplug,
> > + .restore = drm_splash_client_restore,
> > + .unregister = drm_splash_client_unregister,
> > + .free = drm_splash_client_free,
> > +};
> > +
> > +/**
> > + * drm_splash_register() - Register a drm device to drm_splash
> > + * @dev: the drm device to register.
> > + * @format: drm device preferred format.
> > + */
> > +void drm_splash_register(struct drm_device *dev,
> > + const struct drm_format_info *format)
> > +{
> > + struct drm_splash *splash;
> > +
> > + splash = kzalloc(sizeof(*splash), GFP_KERNEL);
> > + if (!splash)
> > + goto err_warn;
> > +
> > + mutex_init(&splash->hotplug_lock);
> > + spin_lock_init(&splash->data_lock);
> > +
> > + if (format && format->num_planes == 1)
> > + splash->preferred_format = format->format;
> > + else
> > + splash->preferred_format = DRM_FORMAT_RGB888;
> > +
> > + if (drm_client_init(dev, &splash->client, "drm_splash",
> > + &drm_splash_client_funcs))
> > + goto err_free;
> > +
> > + drm_client_register(&splash->client);
> > + drm_dbg(dev, "Registered with drm splash");
> > +
> > + return;
> > +
> > +err_free:
> > + kfree(splash);
> > +err_warn:
> > + drm_warn(dev, "Failed to register with drm splash");
> > +}
> >
>
>
Thank you!
Reagrds,
Francesco
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