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authorHans de Goede <hdegoede@redhat.com>2014-12-20 15:15:23 +0100
committerHans de Goede <hdegoede@redhat.com>2015-01-14 14:56:38 +0100
commit40f1b87ce7f84a7ff74fd519dc2c75b333068815 (patch)
tree82f8ffb8a94df6f7b3266553ac4b0171335fde15
parentf300068ddd85914dbec48d9ef2381b6f3ad92fc3 (diff)
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sunxi: video: Give hotplug-detect (hpd) signal some time to show up
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>
-rw-r--r--drivers/video/sunxi_display.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/video/sunxi_display.c b/drivers/video/sunxi_display.c
index 795835d..5a14785 100644
--- a/drivers/video/sunxi_display.c
+++ b/drivers/video/sunxi_display.c
@@ -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)