x86: dm: video: Add a framebuffer driver that utilizes VBT

When a VBT is given to an FSP that supports graphics initialization,
the FSP will produce a graphics info HOB that contains all necessary
information for the linear frame buffer of the integrated graphics
device. This adds a DM video driver for it.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Bin Meng 2017-08-15 22:41:56 -07:00
parent 6c22379eaf
commit 5df91f1c82
3 changed files with 133 additions and 0 deletions

View file

@ -592,6 +592,14 @@ config VBT_ADDR
example, base address of 0xfff90000 indicates that the image will
be put at offset 0x90000 from the beginning of a 1MB flash device.
config VIDEO_FSP
bool "Enable FSP framebuffer driver support"
depends on HAVE_VBT && DM_VIDEO
help
Turn on this option to enable a framebuffer driver when U-Boot is
using Video BIOS Table (VBT) image for FSP firmware to initialize
the integrated graphics device.
config ROM_TABLE_ADDR
hex
default 0xf0000

View file

@ -8,4 +8,5 @@ obj-y += cmd_fsp.o
obj-y += fsp_car.o
obj-y += fsp_common.o
obj-y += fsp_dram.o
obj-$(CONFIG_VIDEO_FSP) += fsp_graphics.o
obj-y += fsp_support.o

View file

@ -0,0 +1,124 @@
/*
* Copyright (C) 2017, Bin Meng <bmeng.cn@gmail.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <dm.h>
#include <vbe.h>
#include <video.h>
#include <asm/fsp/fsp_support.h>
DECLARE_GLOBAL_DATA_PTR;
struct pixel {
u8 pos;
u8 size;
};
static const struct fsp_framebuffer {
struct pixel red;
struct pixel green;
struct pixel blue;
struct pixel rsvd;
} fsp_framebuffer_format_map[] = {
[pixel_rgbx_8bpc] = { {0, 8}, {8, 8}, {16, 8}, {24, 8} },
[pixel_bgrx_8bpc] = { {16, 8}, {8, 8}, {0, 8}, {24, 8} },
};
static int save_vesa_mode(struct vesa_mode_info *vesa)
{
const struct hob_graphics_info *ginfo;
const struct fsp_framebuffer *fbinfo;
ginfo = fsp_get_graphics_info(gd->arch.hob_list, NULL);
/*
* If there is no graphics info structure, bail out and keep
* running on the serial console.
*/
if (!ginfo) {
debug("FSP graphics hand-off block not found\n");
return -ENXIO;
}
vesa->x_resolution = ginfo->width;
vesa->y_resolution = ginfo->height;
vesa->bits_per_pixel = 32;
vesa->bytes_per_scanline = ginfo->pixels_per_scanline * 4;
vesa->phys_base_ptr = ginfo->fb_base;
if (ginfo->pixel_format >= pixel_bitmask) {
debug("FSP set unknown framebuffer format: %d\n",
ginfo->pixel_format);
return -EINVAL;
}
fbinfo = &fsp_framebuffer_format_map[ginfo->pixel_format];
vesa->red_mask_size = fbinfo->red.size;
vesa->red_mask_pos = fbinfo->red.pos;
vesa->green_mask_size = fbinfo->green.size;
vesa->green_mask_pos = fbinfo->green.pos;
vesa->blue_mask_size = fbinfo->blue.size;
vesa->blue_mask_pos = fbinfo->blue.pos;
vesa->reserved_mask_size = fbinfo->rsvd.size;
vesa->reserved_mask_pos = fbinfo->rsvd.pos;
return 0;
}
static int fsp_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);
struct vesa_mode_info *vesa = &mode_info.vesa;
int ret;
printf("Video: ");
/* Initialize vesa_mode_info structure */
ret = save_vesa_mode(vesa);
if (ret)
goto err;
/*
* The framebuffer base address in the FSP graphics info HOB reflects
* the value assigned by the FSP. After PCI enumeration the framebuffer
* base address may be relocated. Let's get the updated one from device.
*
* For IGD, it seems to be always on BAR2.
*/
vesa->phys_base_ptr = dm_pci_read_bar32(dev, 2);
ret = vbe_setup_video_priv(vesa, uc_priv, plat);
if (ret)
goto err;
printf("%dx%dx%d\n", uc_priv->xsize, uc_priv->ysize,
vesa->bits_per_pixel);
return 0;
err:
printf("No video mode configured in FSP!\n");
return ret;
}
static const struct udevice_id fsp_video_ids[] = {
{ .compatible = "fsp-fb" },
{ }
};
U_BOOT_DRIVER(fsp_video) = {
.name = "fsp_video",
.id = UCLASS_VIDEO,
.of_match = fsp_video_ids,
.probe = fsp_video_probe,
};
static struct pci_device_id fsp_video_supported[] = {
{ PCI_DEVICE_CLASS(PCI_CLASS_DISPLAY_VGA << 8, 0xffff00) },
{ },
};
U_BOOT_PCI_DEVICE(fsp_video, fsp_video_supported);