From: Baihan Li <libai...@huawei.com>
The issue is that drm_connector_helper_detect_from_ddc() returns wrong
status when plugging or unplugging the monitor. To perform a DP detect(),
add read_dpcd_cap() and read_sink_count() to detect DP monitor, and 200ms
delay doesn't need anymore.
Fixes: 3c7623fb5bb6 ("drm/hisilicon/hibmc: Enable this hot plug detect of irq
feature")
Signed-off-by: Baihan Li <libai...@huawei.com>
Signed-off-by: Yongbang Shi <shiyongb...@huawei.com>
---
ChangeLog:
v4 -> v5:
- fix the commit message and DP detect_ctx(), suggested by Dmitry Baryshkov.
---
drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_dp.c | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_dp.c
b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_dp.c
index d06832e62e96..123372ae2d40 100644
--- a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_dp.c
+++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_dp.c
@@ -12,6 +12,7 @@
#include "hibmc_drm_drv.h"
#include "dp/dp_hw.h"
+#include "dp/dp_comm.h"
#define DP_MASKED_SINK_HPD_PLUG_INT BIT(2)
@@ -34,7 +35,16 @@ static int hibmc_dp_connector_get_modes(struct drm_connector
*connector)
static int hibmc_dp_detect(struct drm_connector *connector,
struct drm_modeset_acquire_ctx *ctx, bool force)
{
- mdelay(200);
+ struct hibmc_dp *dp = to_hibmc_dp(connector);
+ int ret;
+
+ ret = drm_dp_read_dpcd_caps(&dp->aux, dp->dp_dev->dpcd);
+ if (ret)
+ return connector_status_disconnected;
+
+ ret = drm_dp_read_sink_count(&dp->aux);
+ if (ret <= 0)
+ return connector_status_disconnected;
return drm_connector_helper_detect_from_ddc(connector, ctx, force);
}
--
2.33.0
