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sunxi: display: Add overscan correction

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Add support for making the visual area of the framebuffer smaller and
drawing a black border around it. This is intended for use with
overscanning monitors (esp. with composite video out), to avoid part
of the picture being invisible.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>
Acked-by: Anatolij Gustschin <agust@denx.de>
This commit is contained in:
Hans de Goede 2015-08-05 00:06:47 +02:00
parent c67a8767f5
commit 58332f89b6
3 changed files with 45 additions and 12 deletions
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5
doc/README.video
View file

@ -68,6 +68,11 @@ The sunxi u-boot driver supports the following video-mode options:
overrides the xres, yres and refresh from the video-mode env. variable.
Defaults to edid=1.
- overscan_x/overscan_y=<int> - Set x/y overscan value
This configures a black border on the left and right resp. top and bottom
to deal with overscanning displays. Defaults to overscan_x=32 and
overscan_y=20 for composite monitors, 0 for other monitors.
For example to always use the hdmi connector, even if no cable is inserted,
using edid info when available and otherwise initalizing it at 1024x768@60Hz,
use: "setenv video-mode sunxi:1024x768-24@60,monitor=dvi,hpd=0,edid=1".

51
drivers/video/sunxi_display.c
View file

@ -19,6 +19,7 @@
#include <fdtdec.h>
#include <fdt_support.h>
#include <i2c.h>
#include <malloc.h>
#include <video_fb.h>
#include "videomodes.h"
#include "hitachi_tx18d42vm_lcd.h"
@ -51,6 +52,7 @@ struct sunxi_display {
GraphicDevice graphic_device;
enum sunxi_monitor monitor;
unsigned int depth;
unsigned int fb_addr;
unsigned int fb_size;
} sunxi_display;
@ -1297,9 +1299,10 @@ void *video_hw_init(void)
#ifdef CONFIG_VIDEO_HDMI
int ret, hpd, hpd_delay, edid;
#endif
int i, overscan_offset, overscan_x, overscan_y;
unsigned int fb_dma_addr;
char mon[16];
char *lcd_mode = CONFIG_VIDEO_LCD_MODE;
int i;
memset(&sunxi_display, 0, sizeof(struct sunxi_display));
@ -1310,6 +1313,8 @@ void *video_hw_init(void)
hpd_delay = video_get_option_int(options, "hpd_delay", 500);
edid = video_get_option_int(options, "edid", 1);
#endif
overscan_x = video_get_option_int(options, "overscan_x", -1);
overscan_y = video_get_option_int(options, "overscan_y", -1);
sunxi_display.monitor = sunxi_get_default_mon(true);
video_get_option_string(options, "monitor", mon, sizeof(mon),
sunxi_get_mon_desc(sunxi_display.monitor));
@ -1386,8 +1391,20 @@ void *video_hw_init(void)
break;
}
/* Yes these defaults are quite high, overscan on composite sucks... */
if (overscan_x == -1)
overscan_x = sunxi_is_composite() ? 32 : 0;
if (overscan_y == -1)
overscan_y = sunxi_is_composite() ? 20 : 0;
sunxi_display.fb_size =
(mode->xres * mode->yres * 4 + 0xfff) & ~0xfff;
overscan_offset = (overscan_y * mode->xres + overscan_x) * 4;
/* We want to keep the fb_base for simplefb page aligned, where as
* the sunxi dma engines will happily accept an unaligned address. */
if (overscan_offset)
sunxi_display.fb_size += 0x1000;
if (sunxi_display.fb_size > CONFIG_SUNXI_MAX_FB_SIZE) {
printf("Error need %dkB for fb, but only %dkB is reserved\n",
sunxi_display.fb_size >> 10,
@ -1395,25 +1412,36 @@ void *video_hw_init(void)
return NULL;
}
printf("Setting up a %dx%d%s %s console\n", mode->xres, mode->yres,
printf("Setting up a %dx%d%s %s console (overscan %dx%d)\n",
mode->xres, mode->yres,
(mode->vmode == FB_VMODE_INTERLACED) ? "i" : "",
sunxi_get_mon_desc(sunxi_display.monitor));
sunxi_get_mon_desc(sunxi_display.monitor),
overscan_x, overscan_y);
gd->fb_base = gd->bd->bi_dram[0].start +
gd->bd->bi_dram[0].size - sunxi_display.fb_size;
sunxi_engines_init();
sunxi_mode_set(mode, gd->fb_base - CONFIG_SYS_SDRAM_BASE);
fb_dma_addr = gd->fb_base - CONFIG_SYS_SDRAM_BASE;
sunxi_display.fb_addr = gd->fb_base;
if (overscan_offset) {
fb_dma_addr += 0x1000 - (overscan_offset & 0xfff);
sunxi_display.fb_addr += (overscan_offset + 0xfff) & ~0xfff;
memset((void *)gd->fb_base, 0, sunxi_display.fb_size);
flush_cache(gd->fb_base, sunxi_display.fb_size);
}
sunxi_mode_set(mode, fb_dma_addr);
/*
* These are the only members of this structure that are used. All the
* others are driver specific. There is nothing to decribe pitch or
* stride, but we are lucky with our hw.
* others are driver specific. The pitch is stored in plnSizeX.
*/
graphic_device->frameAdrs = gd->fb_base;
graphic_device->frameAdrs = sunxi_display.fb_addr;
graphic_device->gdfIndex = GDF_32BIT_X888RGB;
graphic_device->gdfBytesPP = 4;
graphic_device->winSizeX = mode->xres;
graphic_device->winSizeY = mode->yres;
graphic_device->winSizeX = mode->xres - 2 * overscan_x;
graphic_device->winSizeY = mode->yres - 2 * overscan_y;
graphic_device->plnSizeX = mode->xres * graphic_device->gdfBytesPP;
return graphic_device;
}
@ -1490,10 +1518,9 @@ int sunxi_simplefb_setup(void *blob)
return ret;
}
ret = fdt_setup_simplefb_node(blob, offset, gd->fb_base,
ret = fdt_setup_simplefb_node(blob, offset, sunxi_display.fb_addr,
graphic_device->winSizeX, graphic_device->winSizeY,
graphic_device->winSizeX * graphic_device->gdfBytesPP,
"x8r8g8b8");
graphic_device->plnSizeX, "x8r8g8b8");
if (ret)
eprintf("Cannot setup simplefb: Error setting properties\n");

1
include/configs/sunxi-common.h
View file

@ -300,6 +300,7 @@ extern int soft_i2c_gpio_scl;
#define CONFIG_VIDEO_LOGO
#define CONFIG_VIDEO_STD_TIMINGS
#define CONFIG_I2C_EDID
#define VIDEO_LINE_LEN (pGD->plnSizeX)
/* allow both serial and cfb console. */
#define CONFIG_CONSOLE_MUX