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dm: video: Add driver-model support to vesa graphics

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Provide a function to run the Vesa BIOS for a given PCI device and obtain
the resulting configuration (e.g. display size) for use by the video
uclass. This makes it easier to write a video driver that uses vesa and
supports driver model.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass 2016-10-05 20:42:17 -06:00 • committed by Bin Meng
parent d8441ea27e
commit ee87ee82e1
2 changed files with 57 additions and 0 deletions
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55
drivers/pci/pci_rom.c
View file

@ -31,6 +31,7 @@
#include <pci.h> #include <pci.h>
#include <pci_rom.h> #include <pci_rom.h>
#include <vbe.h> #include <vbe.h>
#include <video.h>
#include <video_fb.h> #include <video_fb.h>
#include <linux/screen_info.h> #include <linux/screen_info.h>
@ -348,3 +349,57 @@ err:
free(ram); free(ram);
return ret; return ret;
} }
#ifdef CONFIG_DM_VIDEO
static int vbe_setup_video_priv(struct vesa_mode_info *vesa,
struct video_priv *uc_priv,
struct video_uc_platdata *plat)
{
if (!vesa->x_resolution)
return -ENXIO;
uc_priv->xsize = vesa->x_resolution;
uc_priv->ysize = vesa->y_resolution;
switch (vesa->bits_per_pixel) {
case 32:
case 24:
uc_priv->bpix = VIDEO_BPP32;
break;
case 16:
uc_priv->bpix = VIDEO_BPP16;
break;
default:
return -EPROTONOSUPPORT;
}
plat->base = vesa->phys_base_ptr;
plat->size = vesa->bytes_per_scanline * vesa->y_resolution;
return 0;
}
int vbe_setup_video(struct udevice *dev, int (*int15_handler)(void))
{
struct video_uc_platdata *plat = dev_get_uclass_platdata(dev);
struct video_priv *uc_priv = dev_get_uclass_priv(dev);
int ret;
/* If we are running from EFI or coreboot, this can't work */
if (!ll_boot_init())
return -EPERM;
bootstage_start(BOOTSTAGE_ID_ACCUM_LCD, "vesa display");
ret = dm_pci_run_vga_bios(dev, int15_handler, PCI_ROM_USE_NATIVE |
PCI_ROM_ALLOW_FALLBACK);
bootstage_accum(BOOTSTAGE_ID_ACCUM_LCD);
if (ret) {
debug("failed to run video BIOS: %d\n", ret);
return ret;
}
ret = vbe_setup_video_priv(&mode_info.vesa, uc_priv, plat);
if (ret) {
debug("No video mode configured\n");
return ret;
}
return 0;
}
#endif

2
include/vbe.h
View file

@ -106,5 +106,7 @@ extern struct vbe_mode_info mode_info;
struct graphic_device; struct graphic_device;
int vbe_get_video_info(struct graphic_device *gdev); int vbe_get_video_info(struct graphic_device *gdev);
struct video_priv;
int vbe_setup_video(struct udevice *dev, int (*int15_handler)(void));
#endif #endif