drm/exynos: dp: Check hp gpio in hp detect function

Check the hotplug gpio in the hpd function so we know when it's
asserted. This fixes the return value of the is_connected callback.

BUG=chrome-os-partner:16280
TEST=None

Change-Id: I1ab0c7d830ecdc7b7f38ffd81895038978e4e57a
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/38319
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>

diff --git a/drivers/gpu/drm/exynos/exynos_dp_core.c b/drivers/gpu/drm/exynos/exynos_dp_core.c
index 0f02404..b81f510 100644 (file)
--- a/drivers/gpu/drm/exynos/exynos_dp_core.c
+++ b/drivers/gpu/drm/exynos/exynos_dp_core.c
@@ -58,6 +58,9 @@ static int exynos_dp_detect_hpd(struct exynos_dp_device *dp)
 {
        int timeout_loop = 0;
 
+       if (gpio_is_valid(dp->hpd_gpio))
+               return !gpio_get_value(dp->hpd_gpio);
+
        while (exynos_dp_get_plug_in_status(dp) != 0) {
                timeout_loop++;
                if (DP_TIMEOUT_LOOP_COUNT < timeout_loop) {