Linux-i2c Archive on lore.kernel.org
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* [PATCH 1/7] i2c: tegra: remove dead code
@ 2020-07-23 12:18 Krishna Yarlagadda
  2020-07-23 12:18 ` [PATCH 2/7] i2c: tegra: Fix setting of controller ID Krishna Yarlagadda
                   ` (5 more replies)
  0 siblings, 6 replies; 13+ messages in thread
From: Krishna Yarlagadda @ 2020-07-23 12:18 UTC (permalink / raw)
  To: digetx, linux-i2c, thierry.reding
  Cc: jonathanh, linux-tegra, linux-kernel, ldewangan, smohammed,
	rgumasta, Krishna Yarlagadda

From: Shardar Shariff Md <smohammed@nvidia.com>

When I2C_HEADER_CONT_ON_NAK bit in IO header is set then “No ACK
from slave” error is not reported (NACK is considered as ACK
and transfer is continued). So if I2C_ERR_NO_ACK is set, it would
imply I2C_M_IGNORE_NAK is not set and hence this code will never
execute. When I2C_HEADER_CONT_ON_NAK bit in IO header is set then
“No ACK from slave” error is not reported.
Condition (msg->flags & I2C_M_IGNORE_NAK) will never be hit

Signed-off-by: Shardar Shariff Md <smohammed@nvidia.com>
Signed-off-by: Krishna Yarlagadda <kyarlagadda@nvidia.com>
---
 drivers/i2c/busses/i2c-tegra.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
index 1577296..c6c870c 100644
--- a/drivers/i2c/busses/i2c-tegra.c
+++ b/drivers/i2c/busses/i2c-tegra.c
@@ -1336,11 +1336,8 @@ static int tegra_i2c_xfer_msg(struct tegra_i2c_dev *i2c_dev,
 		return -EAGAIN;
 	}
 
-	if (i2c_dev->msg_err == I2C_ERR_NO_ACK) {
-		if (msg->flags & I2C_M_IGNORE_NAK)
-			return 0;
+	if (i2c_dev->msg_err == I2C_ERR_NO_ACK)
 		return -EREMOTEIO;
-	}
 
 	return -EIO;
 }
-- 
2.7.4


^ permalink raw reply	[flat|nested] 13+ messages in thread

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Thread overview: 13+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-07-23 12:18 [PATCH 1/7] i2c: tegra: remove dead code Krishna Yarlagadda
2020-07-23 12:18 ` [PATCH 2/7] i2c: tegra: Fix setting of controller ID Krishna Yarlagadda
2020-07-23 12:18 ` [PATCH 3/7] i2c: tegra: add flag for register write buffering Krishna Yarlagadda
2020-07-23 13:17   ` Dmitry Osipenko
2020-07-23 12:18 ` [PATCH 4/7] i2c: tegra: add high speed mode support Krishna Yarlagadda
2020-07-23 13:27   ` Dmitry Osipenko
2020-07-25 11:26   ` Michał Mirosław
2020-07-23 12:18 ` [PATCH 5/7] i2c: tegra: enable second level clock gating Krishna Yarlagadda
2020-07-23 14:01   ` Dmitry Osipenko
2020-07-23 12:18 ` [PATCH 6/7] i2c: tegra: DMA support for t186 and t194 Krishna Yarlagadda
2020-07-23 13:16   ` Dmitry Osipenko
2020-07-23 13:38   ` Dmitry Osipenko
2020-07-23 12:18 ` [PATCH 7/7] i2c: tegra: dump I2C registers on timeout Krishna Yarlagadda

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