Additional 50 ms delay is needed between DPCD reads on HP Bizlink 1326
DP to VGA adapter. Having said that, I haven't noticed a need for
additional delay between DPCD reads on other DP-VGA dongles.
While at it, let's replace mdelay() with usleep_range() routine.
Signed-off-by: Mika Kahola <mika.kahola@xxxxxxxxx>
---
drivers/gpu/drm/i915/intel_dp.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 0e326e7..ff3883c 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -3125,9 +3125,11 @@ intel_dp_dpcd_read_wake(struct drm_dp_aux *aux, unsigned int offset,
for (i = 0; i < 3; i++) {
ret = drm_dp_dpcd_read(aux, offset, buffer, size);
- if (ret == size)
+ if (ret == size) {
+ usleep_range(50000, 50100);
return ret;
- msleep(1);
+ }
+ usleep_range(1000, 1100);
}
return ret;
--
1.9.1
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