linux

iv/linux

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Jianqun Xu 19423ba710 drm/bridge: analogix_dp: return error if transfer none byte

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@rock-chips.com>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Jianqun Xu <jay.xu@rock-chips.com>
Signed-off-by: Archit Taneja <architt@codeaurora.org>
Link: http://patchwork.freedesktop.org/patch/msgid/1479255219-7243-1-git-send-email-jay.xu@rock-chips.com

2016-11-16 11:16:13 +05:30

adv7511

drm/bridge: adv7511: add support for the 2nd chip

2016-09-12 13:20:43 +05:30

analogix

drm/bridge: analogix_dp: return error if transfer none byte

2016-11-16 11:16:13 +05:30

analogix-anx78xx.c

drm/bridge: Call drm_connector_cleanup directly

2016-10-05 15:20:36 +02:00

analogix-anx78xx.h

drm/bridge: Add Analogix anx78xx support