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Revert "drm/radeon: fix DP link training issue with second 4K monitor"
[firefly-linux-kernel-4.4.55.git]
/
drivers
/
gpu
/
drm
/
radeon
/
radeon_atpx_handler.c
diff --git
a/drivers/gpu/drm/radeon/radeon_atpx_handler.c
b/drivers/gpu/drm/radeon/radeon_atpx_handler.c
index c4b4f298a2831a2ca3723bebe3ef8834bc6a6f3c..69ce955711368468e831bac62890de158efd9061 100644
(file)
--- a/
drivers/gpu/drm/radeon/radeon_atpx_handler.c
+++ b/
drivers/gpu/drm/radeon/radeon_atpx_handler.c
@@
-10,6
+10,7
@@
#include <linux/slab.h>
#include <linux/acpi.h>
#include <linux/pci.h>
+#include <linux/delay.h>
#include "radeon_acpi.h"
@@
-255,6
+256,10
@@
static int radeon_atpx_set_discrete_state(struct radeon_atpx *atpx, u8 state)
if (!info)
return -EIO;
kfree(info);
+
+ /* 200ms delay is required after off */
+ if (state == 0)
+ msleep(200);
}
return 0;
}