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display: Retry dcp_ib_get_hpd() for up to 2 seconds

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After boot DCP will need some time to detect connected displays.

Signed-off-by: Janne Grunau <j@jannau.net>
This commit is contained in:
Janne Grunau 2022-01-16 22:40:34 +01:00 committed by Hector Martin
parent 6736368275
commit b2cb605832
1 changed files with 18 additions and 2 deletions
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20
src/display.c
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@ -7,6 +7,9 @@
#include "utils.h"
#include "xnuboot.h"
#define DISPLAY_STATUS_DELAY 100
#define DISPLAY_STATUS_RETRIES 20
#define COMPARE(a, b) \
if ((a) > (b)) { \
*best = modes[i]; \
@ -80,9 +83,22 @@ int display_configure(void)
// Detect if display is connected
int timing_cnt, color_cnt;
int hpd = ret = dcp_ib_get_hpd(iboot, &timing_cnt, &color_cnt);
int hpd = 0, retries = 0;
if (hpd < 0) {
/* After boot DCP does not immediately report a connected display. Retry getting display
* information for 2 seconds.
*/
while (retries++ < DISPLAY_STATUS_RETRIES) {
hpd = dcp_ib_get_hpd(iboot, &timing_cnt, &color_cnt);
if (hpd < 0)
ret = hpd;
else if (hpd && timing_cnt && color_cnt)
break;
if (retries < DISPLAY_STATUS_RETRIES)
mdelay(DISPLAY_STATUS_DELAY);
}
printf("display: waited %d ms for display status\n", (retries - 1) * DISPLAY_STATUS_DELAY);
if (ret < 0) {
printf("display: failed to get display status\n");
goto err_iboot;
}