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sunxi: video: Give hotplug-detect (hpd) signal some time to show up

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When using a hdmi powered hdmi to vga dongle, and cold booting a sunxi
device, the hpd detect code would not see the dongle (until a warm reboot),
because the dongle needs some time to boot.

Testing has shown that this dongle needs 213ms to respond on a cold boot,
so wait up to 300ms for a hpd signal to show up before giving up.

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 2014-12-20 15:15:23 +01:00
parent f300068ddd
commit 40f1b87ce7
1 changed files with 6 additions and 2 deletions
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8
drivers/video/sunxi_display.c
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@ -48,6 +48,7 @@ static int sunxi_hdmi_hpd_detect(void)
(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;
/* Set pll3 to 300MHz */
clock_set_pll3(300000000);
@ -68,9 +69,12 @@ static int sunxi_hdmi_hpd_detect(void)
writel(SUNXI_HDMI_CTRL_ENABLE, &hdmi->ctrl);
writel(SUNXI_HDMI_PAD_CTRL0_HDP, &hdmi->pad_ctrl0);
udelay(1000);
while (timer_get_us() < tmo) {
if (readl(&hdmi->hpd) & SUNXI_HDMI_HPD_DETECT)
return 1;
}
return (readl(&hdmi->hpd) & SUNXI_HDMI_HPD_DETECT) ? 1 : 0;
return 0;
}
static void sunxi_hdmi_shutdown(void)