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[PATCH] drm/bridge: analogix_dp: Don't return -EBUSY when msg->size is 0 in aux transaction

From zain wang <wzz@rock-chips.com>
Newsgroups linux.kernel
Subject [PATCH] drm/bridge: analogix_dp: Don't return -EBUSY when msg->size is 0 in aux transaction
Date 2017-02-13 10:30 +0100
Message-ID <tal7j-1Oy-13@gated-at.bofh.it> (permalink)
Organization linux.* mail to news gateway

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The analogix_dp_transfer() will return -EBUSY if num_transferred is zero.
But sometimes we will send a bare address packet to start the transaction,
like drm_dp_i2c_xfer() show:
	......
	/* Send a bare address packet to start the transaction.
	 * Zero sized messages specify an address only (bare
	 * address) transaction.
	 */
	msg.buffer = NULL;
	msg.size = 0;
	err = drm_dp_i2c_do_msg(aux, &msg);
	......

In this case, the msg->size is zero, so the num_transferred will be zero too.
We can't return -EBUSY here, let's we return num_transferred if num_transferred
equals msg->size.

Signed-off-by: zain wang <wzz@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 303083a..5384aca 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 > 0 ? num_transferred : -EBUSY;
+	return (num_transferred == msg->size) ? num_transferred : -EBUSY;
 }
-- 
1.9.1

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[PATCH] drm/bridge: analogix_dp: Don't return -EBUSY when msg->size is 0 in aux transaction zain wang <wzz@rock-chips.com> - 2017-02-13 10:30 +0100
  Re: [PATCH] drm/bridge: analogix_dp: Don't return -EBUSY when  msg->size is 0 in aux transaction Zain Wang <wzz@rock-chips.com> - 2017-02-20 03:20 +0100
  Re: [PATCH] drm/bridge: analogix_dp: Don't return -EBUSY when  msg->size is 0 in aux transaction Tomasz Figa <tfiga@chromium.org> - 2017-02-20 03:50 +0100
    Re: [PATCH] drm/bridge: analogix_dp: Don't return -EBUSY when  msg->size is 0 in aux transaction Zain Wang <wzz@rock-chips.com> - 2017-02-20 05:10 +0100
      Re: [PATCH] drm/bridge: analogix_dp: Don't return -EBUSY when  msg->size is 0 in aux transaction Tomasz Figa <tfiga@chromium.org> - 2017-02-20 05:30 +0100

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