diff options
| -rw-r--r-- | drivers/gpu/drm/msm/dp/dp_link.c | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/drivers/gpu/drm/msm/dp/dp_link.c b/drivers/gpu/drm/msm/dp/dp_link.c index ef35fac333f7..f1f1d646539d 100644 --- a/drivers/gpu/drm/msm/dp/dp_link.c +++ b/drivers/gpu/drm/msm/dp/dp_link.c @@ -50,6 +50,7 @@ static int dp_aux_link_power_up(struct drm_dp_aux *aux, { u8 value; ssize_t len; + int i; if (link->revision < 0x11) return 0; @@ -61,11 +62,13 @@ static int dp_aux_link_power_up(struct drm_dp_aux *aux, value &= ~DP_SET_POWER_MASK; value |= DP_SET_POWER_D0; - len = drm_dp_dpcd_writeb(aux, DP_SET_POWER, value); - if (len < 0) - return len; - - usleep_range(1000, 2000); + /* retry for 1ms to give the sink time to wake up */ + for (i = 0; i < 3; i++) { + len = drm_dp_dpcd_writeb(aux, DP_SET_POWER, value); + usleep_range(1000, 2000); + if (len == 1) + break; + } return 0; } |