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sunxi: video: Add a hpd_delay parameter to configure hpd delay

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In some extreme cases it may be necessary to wait 1.5 seconds or more for a hpd
signal to show up (and be able to read edid info), but we do not want to
penalize all headless boots with an extra second boot delay, so add a hpd_delay
parameter which can be set through the video-mode env. variable.

While at it raise the default from 300ms to 500ms as 300 may very well be too
low in many cases.

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 2014-12-28 09:13:21 +01:00
parent d9786d2380
commit 7fad8a9802
2 changed files with 12 additions and 5 deletions
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8
doc/README.video
View File

@ -53,6 +53,12 @@ The sunxi u-boot driver supports the following video-mode options:
1: Enabled. Fallback to the lcd / vga / none in that order (if available)
Defaults to hpd=1.
- hpd_delay=<int> - How long to wait for the hdmi HPD signal in milliseconds
When the monitor and the board power up at the same time, it may take some
time for the monitor to assert the HPD signal. This configures how long to
wait for the HPD signal before assuming no cable is connected.
Defaults to hpd_delay=500.
- edid=[0|1] - Enable use of DDC + EDID to get monitor info
0: Disabled.
1: Enabled. If valid EDID info was read from the monitor the EDID info will
@ -61,4 +67,4 @@ The sunxi u-boot driver supports the following video-mode options:
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: video-mode=sunxi:1024x768-24@60,monitor=dvi,hpd=0,edid=1 .
use: "setenv video-mode sunxi:1024x768-24@60,monitor=dvi,hpd=0,edid=1".

9
drivers/video/sunxi_display.c
View File

@ -56,13 +56,13 @@ static int await_completion(u32 *reg, u32 mask, u32 val)
return 0;
}
static int sunxi_hdmi_hpd_detect(void)
static int sunxi_hdmi_hpd_detect(int hpd_delay)
{
struct sunxi_ccm_reg * const ccm =
(struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
struct sunxi_hdmi_reg * const hdmi =
(struct sunxi_hdmi_reg *)SUNXI_HDMI_BASE;
unsigned long tmo = timer_get_us() + 300000;
unsigned long tmo = timer_get_us() + hpd_delay * 1000;
/* Set pll3 to 300MHz */
clock_set_pll3(300000000);
@ -851,7 +851,7 @@ void *video_hw_init(void)
struct ctfb_res_modes custom;
const char *options;
#ifdef CONFIG_VIDEO_HDMI
int ret, hpd, edid;
int ret, hpd, hpd_delay, edid;
#endif
char mon[16];
char *lcd_mode = CONFIG_VIDEO_LCD_MODE;
@ -867,6 +867,7 @@ void *video_hw_init(void)
&sunxi_display.depth, &options);
#ifdef CONFIG_VIDEO_HDMI
hpd = video_get_option_int(options, "hpd", 1);
hpd_delay = video_get_option_int(options, "hpd_delay", 500);
edid = video_get_option_int(options, "edid", 1);
sunxi_display.monitor = sunxi_monitor_dvi;
#elif defined CONFIG_VIDEO_VGA_VIA_LCD
@ -891,7 +892,7 @@ void *video_hw_init(void)
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();
ret = sunxi_hdmi_hpd_detect(hpd_delay);
if (ret) {
printf("HDMI connected: ");
if (edid && sunxi_hdmi_edid_get_mode(&custom) == 0)