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sunxi: video: Fallback from HDMI to VGA on boards with VGA

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If a board has no LCD, but does have VGA fallback to VGA when no HDMI cable
is connected (unless hpd=0).

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>
This commit is contained in:
Hans de Goede 2014-12-25 13:52:04 +01:00
parent 3ffbe477da
commit 49d2703dd8
2 changed files with 31 additions and 25 deletions
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3
doc/README.video
View file

@ -50,8 +50,7 @@ The sunxi u-boot driver supports the following video-mode options:
- hpd=[0|1] - Enable use of the hdmi HotPlug Detect feature
0: Disabled. Configure dvi/hdmi output even if no cable is detected
1: Enabled. If a LCD has been configured fallback to the LCD when no cable is
detected, if no LCD is configured, disable video ouput.
1: Enabled. Fallback to the lcd / vga / none in that order (if available)
Defaults to hpd=1.
- edid=[0|1] - Enable use of DDC + EDID to get monitor info

51
drivers/video/sunxi_display.c
View file

@ -846,36 +846,43 @@ void *video_hw_init(void)
printf("Unknown monitor: '%s', falling back to '%s'\n",
mon, sunxi_get_mon_desc(sunxi_display.monitor));
switch (sunxi_display.monitor) {
case sunxi_monitor_none:
return NULL;
case sunxi_monitor_dvi:
case sunxi_monitor_hdmi:
#ifndef CONFIG_VIDEO_HDMI
printf("HDMI/DVI not supported on this board\n");
sunxi_display.monitor = sunxi_monitor_none;
return NULL;
#else
#ifdef CONFIG_VIDEO_HDMI
/* If HDMI/DVI is selected do HPD & EDID, and handle fallback */
if (sunxi_display.monitor == sunxi_monitor_dvi ||
sunxi_display.monitor == sunxi_monitor_hdmi) {
/* Always call hdp_detect, as it also enables clocks, etc. */
ret = sunxi_hdmi_hpd_detect();
if (ret) {
printf("HDMI connected: ");
if (edid && sunxi_hdmi_edid_get_mode(&custom) == 0)
mode = &custom;
break;
}
if (!hpd)
break; /* User has requested to ignore hpd */
} else if (hpd) {
sunxi_hdmi_shutdown();
if (lcd_mode[0] == 0) {
sunxi_display.monitor = sunxi_monitor_none;
return NULL; /* No LCD, bail */
}
/* Fall back / through to LCD */
/* Fallback to lcd / vga / none */
if (lcd_mode[0]) {
sunxi_display.monitor = sunxi_monitor_lcd;
} else {
#ifdef CONFIG_VIDEO_VGA_VIA_LCD
sunxi_display.monitor = sunxi_monitor_vga;
#else
sunxi_display.monitor = sunxi_monitor_none;
#endif
}
} /* else continue with hdmi/dvi without a cable connected */
}
#endif
switch (sunxi_display.monitor) {
case sunxi_monitor_none:
return NULL;
case sunxi_monitor_dvi:
case sunxi_monitor_hdmi:
#ifdef CONFIG_VIDEO_HDMI
break;
#else
printf("HDMI/DVI not supported on this board\n");
sunxi_display.monitor = sunxi_monitor_none;
return NULL;
#endif
case sunxi_monitor_lcd:
if (lcd_mode[0]) {