diff options
| author | Dave Airlie <airlied@redhat.com> | 2014-04-04 11:34:37 +1000 |
|---|---|---|
| committer | Dave Airlie <airlied@redhat.com> | 2014-04-05 16:06:34 +1000 |
| commit | aa17edff0afa893b5ab1dd60d842cc6f42e847b4 (patch) | |
| tree | ef4b30653b21ee5ff17a5c4ca67b23f3b7fe39b4 /drivers/gpu/drm/drm_dp_helper.c | |
| parent | f4d1b02129d3045c20ebadda8865db2cc7ce2cb5 (diff) | |
drm/dp_helper: don't return EPROTO for defers (v2)
If we get a msg.reply of REPLY_DEFER, we also get an err of 0
so we fail reads with 0 < size and return -EPROTO instead of trying
again.
v2: same fix in i2c code.
Found writing MST support.
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'drivers/gpu/drm/drm_dp_helper.c')
| -rw-r--r-- | drivers/gpu/drm/drm_dp_helper.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c index f4babed2f557..27671489477d 100644 --- a/drivers/gpu/drm/drm_dp_helper.c +++ b/drivers/gpu/drm/drm_dp_helper.c @@ -386,11 +386,11 @@ static int drm_dp_dpcd_access(struct drm_dp_aux *aux, u8 request, return err; } - if (err < size) - return -EPROTO; switch (msg.reply & DP_AUX_NATIVE_REPLY_MASK) { case DP_AUX_NATIVE_REPLY_ACK: + if (err < size) + return -EPROTO; return err; case DP_AUX_NATIVE_REPLY_NACK: @@ -599,8 +599,6 @@ static int drm_dp_i2c_do_msg(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg) return err; } - if (err < msg->size) - return -EPROTO; switch (msg->reply & DP_AUX_NATIVE_REPLY_MASK) { case DP_AUX_NATIVE_REPLY_ACK: @@ -639,6 +637,8 @@ static int drm_dp_i2c_do_msg(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg) * Both native ACK and I2C ACK replies received. We * can assume the transfer was successful. */ + if (err < msg->size) + return -EPROTO; return 0; case DP_AUX_I2C_REPLY_NACK: |