[PATCH] drm/bridge: analogix_dp: return error if transfer none byte

[Jianqun Xu]

Reference from drm_dp_aux description (about transfer):
Upon success, the implementation should return the number of payload bytes
that were transferred, or a negative error-code on failure. Helpers
propagate errors from the .transfer() function, with the exception of
the -EBUSY error, which causes a transaction to be retried. On a short,
helpers will return -EPROTO to make it simpler to check for failure.

The analogix_dp_transfer will return num_transferred, but if there is none
byte been transferred, the return value will be 0, which means success, we
should return error-code if transfer none byte.

for (retry = 0; retry < 32; retry++) {
        err = aux->transfer(aux, &msg);
        if (err < 0) {
                if (err == -EBUSY)
                        continue;

                goto unlock;
        }
}

Cc: zain wang <wzz at rock-chips.com>
Cc: Sean Paul <seanpaul at chromium.org>
Signed-off-by: Jianqun Xu <jay.xu at rock-chips.com>
---
 drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c 
b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
index cd37ac0..303083a 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
+++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
@@ -1162,5 +1162,5 @@ ssize_t analogix_dp_transfer(struct analogix_dp_device 
*dp,
                 (msg->request & ~DP_AUX_I2C_MOT) == DP_AUX_NATIVE_READ)
                msg->reply = DP_AUX_NATIVE_REPLY_ACK;

-       return num_transferred;
+       return num_transferred > 0 ? num_transferred : -EBUSY;
 }
-- 
1.9.1